三輪精機 List of Products and Services

Bypass valve (switching valve) used in the EGR system of ICEs. It is considered essential to have an EGR system since NOx is generated during exhaust even in next-generation engines (mainly hydrogen engines). We propose a system that includes a bypass valve adopted for commercial vehicles and an electric vacuum pump that generates the negative pressure, which is the actuator drive source for the bypass valve. 【Bypass Valve】 The actuator can be made from resin materials, contributing to weight reduction. Additionally, we have implemented design improvements on the shaft to minimize leakage. 【Electric Vacuum Pump】 We have adopted a motor with brushes to aim for cost reduction. Its durability is over 100,000 km in passenger cars, achieving maintenance-free operation. The capacity is a vane type with 20 cc/rev, and it can be modified to a 40 cc/rev specification by connecting two units. It is oil-free, ensuring that there is no contamination in the piping or actuator! We also manufacture the controller in-house to provide a complete solution. Furthermore, we can offer each component individually, so we welcome requests for just the bypass valve or just the electric vacuum pump!

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You can view the document listing all 23 products by downloading the PDF. Miwaseiki Co., Ltd. has been a specialized manufacturer of automotive parts and industrial machinery since its founding in 1938, leveraging years of experience to continuously provide products that meet the needs of many customers. In particular, we are committed to consistent manufacturing processes in-house, from market research, research and development, and design to manufacturing and quality assurance, which allows us to respond flexibly and quickly to customer requests. We mainly handle important control device components related to pneumatic and hydraulic equipment, engines, cab tilts, transmissions, brakes, engine exhaust gases, and air suspension, striving to manufacture products that are recognized worldwide in various fields, including automotive and construction machinery, and we have numerous transactions with major manufacturers. Additionally, we have been receiving more inquiries beyond automotive and construction machinery, aiming for production that is not limited by industry, product type, or lot size. [Main Products] ■ Air Compressors ■ Vacuum Pumps ■ EGR Valves ■ Speed Limiters, etc. *For more details, please refer to the PDF document or feel free to contact us.

• Trolley

Miwako Seiki Co., Ltd. has been providing products that meet the needs of many customers since its establishment in 1938, leveraging the experience cultivated over many years. In particular, we are committed to consistent manufacturing in-house, from market research, research and development, and design to manufacturing and quality assurance, which allows us to respond flexibly and quickly to customer requests. We mainly handle important control device components related to pneumatic and hydraulic equipment, engines, cab tilts, transmissions, brakes, engine exhaust gases, and air suspension, striving to manufacture products that are recognized worldwide in various fields, including automotive and construction machinery, and we have numerous transactions with major manufacturers. Additionally, we have been receiving more inquiries beyond automotive and construction machinery, aiming for production that is not limited by industry, product type, or lot size. If you have any concerns, please feel free to consult with us. 【Main Products】 ■ Air Compressors ■ Vacuum Pumps ■ EGR Valves ■ Speed Limiters, etc. *For more details, please refer to the PDF materials or feel free to contact us.

• Trolley

We would like to introduce our "Multi-stage Air Cylinder." If you have an air cylinder that strokes to a predetermined position, continuous adjustment is unnecessary. Continuous adjustment incurs costs and requires control... In such cases, please consider the "Multi-stage Air Cylinder" from Sanrin Seiki! 【Features】 ■ The cylinder extends and retracts to a predetermined position simply by supplying air to each air port. ■ Available in two types: 8-position and 16-position. ■ It is used in various situations for automotive applications. (For example, adjusting the angle of the intake fins of a turbocharger.) ■ There are many other applications beyond automotive use! Please consult us about high-pressure types and applications in construction machinery, agricultural machinery, and work machines, etc.! *For more details, please refer to the PDF document or feel free to contact us.

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• Automatic Control Equipment

The Master Mover is a battery-powered walk-behind tug that can safely and efficiently transport heavy loads on wheels. It can move anything with wheels. 《Points》 - Easy operation for anyone - No problem for those with limited strength - No license required - No special skills needed - Easy handling of heavy items - Easy movement in small spaces - Ensured safety *For more details, please refer to the PDF document or feel free to contact us.

• Trolley

The "Double Check Valve" is a check valve that connects only the high-pressure side from two supply ports to the outlet. It is mass-produced for commercial vehicles and is low-cost. The built-in piston seals the low-pressure side by moving. It is highly valued by those who control based on air pressure fluctuations. It has built a reputation and track record for use in vehicles. It also has excellent durability in high-temperature environments. 【Features】 ■ Designed to connect only the high-pressure side of air pressure ■ Proven mass production for commercial vehicles ■ Low cost ■ Can be repurposed for uses other than commercial vehicles *For more details, please refer to the PDF document or feel free to contact us.

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The "pressure regulating valve" is a product that maintains the air tank pressure within a certain range. It is mass-produced for commercial vehicles at a low cost. In addition to commercial vehicles, it can also be repurposed for construction machinery and agricultural machinery that use air equipment. Furthermore, it adopts a piston type and has an operating temperature range of -30 to 70°C, allowing for precise adjustment of the air pressure range. 【Features】 ■ Used for regulating air tank pressure ■ Mass-produced for commercial vehicles ■ Low cost ■ Can be repurposed for other applications besides commercial vehicles *For more details, please refer to the PDF materials or feel free to contact us.

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The "Electric Hydraulic Cylinder" is a product that integrates a cylinder with a self-holding function powered by hydraulics and a pump. ■Cylinder When the supply of hydraulic oil is stopped, a highly reliable check valve mechanism maintains the hydraulic pressure and holds the stopping position of the cylinder. ■Pump Utilizing a piston pump, it achieves compactness and high pressure. It combines high reliability and is equipped for emergency response in case of electric motor failure! 【Features】 ■Holds the stopping position of the cylinder ■High strength and durable structure ■Generates large thrust to accommodate high hydraulic pressure ■Free installation without piping! *For more details, please refer to the PDF document or feel free to contact us.

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The "hydraulic latch" is a product that allows you to turn the lock ON and OFF using hydraulic power. By activating the claws incorporated in the hydraulic latch, you can toggle the lock of the rod material ON and OFF. It is adopted as a product to lock the truck cab so that it does not rise on its own. If there is a demand for ON-OFF locking for purposes other than trucks, please feel free to contact us. It securely locks with the power of hydraulics! 【Features】 ■ Can be installed anywhere as long as there is a hydraulic source ■ Capable of handling high loads due to the use of hydraulics ■ There are examples of adoption for truck cab locks *For more details, please refer to the PDF document or feel free to contact us.

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The "manual hydraulic pump" is a highly reliable product. It can generate hydraulic pressure manually and can easily operate by connecting an impact wrench. It is a compact pump that supplies hydraulic pressure to each hydraulic actuator. Currently, it is used as a pump to supply hydraulic pressure to the cylinder that raises and lowers the cabin of a trading company. It is designed to withstand high hydraulic pressure due to its high-strength and durable structure. 【Features】 ■ Supplies high hydraulic pressure manually or with an impact wrench ■ High-strength and durable structure ■ There are examples of adoption in trucks for overseas markets *For more details, please refer to the PDF materials or feel free to contact us.

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The "Electric Hydraulic Pump" is a highly reliable product. It is a compact pump that supplies hydraulic pressure to each hydraulic actuator. Currently, it is being used as a pump to supply hydraulic pressure to the cylinder that raises and lowers the cabin of commercial vehicles. It is designed to withstand high hydraulic pressure due to its high-strength and durable structure. Additionally, there are examples of its use in domestic large and medium-sized trucks. 【Features】 ■ Uses an electric motor to supply high hydraulic pressure ■ High-strength and durable structure ■ Equipped with a fail-safe mechanism that allows manual operation for emergencies ■ There are examples of its use in domestic large and medium-sized trucks *For more details, please refer to the PDF materials or feel free to contact us.

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We would like to introduce our "Multi-stage Air Cylinder." By supplying compressed air to each port, stroke control is possible in 8 or 16 stages. It is currently used for air volume control in turbochargers. Additionally, it can be installed at a lower cost than electric motor components for environments where electric motors cannot be used or for those who require simple stroke control. 【Features】 ■ Positive pressure actuator ■ Stroke control: two types - 8 positions and 16 positions *For more details, please refer to the PDF document or feel free to contact us.

• Specially equipped vehicles
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The "hydraulic cylinder actuator" is a product that can support PWM control and ON-OFF control. It can be configured with a surge killer solenoid and a stroke sensor. There are examples of its use for accelerator control in truck-mounted cranes. Additionally, the cylinder diameter is Φ34mm, and the rated operating pressure is 1.37MPa. 【Features】 ■ Supports PWM control and ON-OFF control ■ Surge killer solenoid configuration ■ Configuration with stroke sensor ■ Examples of use for accelerator control in truck-mounted cranes *For more details, please refer to the PDF document or feel free to contact us.

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The "Double-acting Hydraulic Cylinder" is a product equipped with a self-holding function using hydraulic pressure. When the supply of hydraulic oil is stopped, it maintains hydraulic pressure with a highly reliable check valve mechanism, holding the cylinder's stopping position. Its high-strength and durable structure allows it to generate significant thrust under high hydraulic pressure. Additionally, there are examples of its adoption in domestic large, medium, and small trucks. 【Features】 ■ Holds the stopping position of the cylinder ■ High-strength and durable structure ■ Generates significant thrust under high hydraulic pressure ■ Examples of adoption in domestic large, medium, and small trucks *For more details, please refer to the PDF document or feel free to contact us.

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The "Hydraulic Power Unit" is a product that achieves compactness and lightweight design through an integrated frame and tank. By using aluminum die casting for the oil tank section and integrating it with the mounting flange, we have achieved approximately 40% weight reduction compared to conventional models while ensuring high rigidity. By directly connecting the gear pump section to the oil tank, we eliminate the need for piping, and since the piping is shorter, we reduce piping resistance, preventing issues such as air ingestion and suction failure. 【Features】 ■ Compact and lightweight design through integrated frame and tank ■ Improved reliability due to piping-free structure ■ Prevention of suction failure such as air ingestion ■ Examples of adoption in domestic large and medium trucks *For more details, please refer to the PDF document or feel free to contact us.

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The "Inclined Plate Axial Piston Motor" is a product that incorporates an integrated case/inclined plate and a thin valve plate. The adoption of a simple parking brake mechanism using a lock pin reduces costs. It boasts high operational reliability and durability cultivated over 30 years of market experience, and various specifications can be set according to customer usage needs. 【Features】 ■ Integration of case/inclined plate ■ Adoption of thin valve plate ■ Cost reduction through the adoption of a simple parking brake mechanism ■ High operational reliability and durability cultivated over 30 years of market experience *For more details, please refer to the PDF document or feel free to contact us.

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The "Pressure Compensation Remote Control Valve" is a hydraulic switching valve that allows operation unaffected by load fluctuations. It enables pressure control according to the load using a load-sensing relief valve. This prevents unnecessary high pressure, reducing leakage in various parts, suppressing heat generation, and lowering pump load. 【Features】 ■ Operation unaffected by load fluctuations ■ Reduced leakage in various parts ■ Suppression of heat generation ■ Reduced pump load *For more details, please refer to the PDF document or feel free to contact us.

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The "Leveling Valve" is produced for commercial vehicles (trucks and buses) and is a low-cost product. The internal air throttle diameter can be selected from φ0.8 to φ2.5. Additionally, we offer "Type II" with an electromagnetic valve for hunting prevention, and "Type III" with a cylinder for kneeling. 【Features】 ■ Produced for commercial vehicles (trucks and buses) and is low-cost ■ Internal air throttle diameter can be selected from φ0.8 to φ2.5 ■ Air supply/exhaust to the air spring can be stopped at any timing (Type II) ■ By preparing a separate electromagnetic valve, the height of the air spring can be changed in two stages (Type III) *For more details, please refer to the PDF document or feel free to contact us.

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The "Greasing System" is a proven product designed for commercial vehicles. The distributor unit distributes and supplies the grease sent from the air pump to each supply point in the necessary amounts. The air pump unit is an air-driven piston pump that sends grease to the distributor when the solenoid valve is turned on. 【Features】 ■ Proposed as a railway application based on proven commercial vehicle products ■ Optimization of lubrication amount through a pressure switch ■ Automation of lubrication tasks ■ Reduction of lubrication time *For more details, please refer to the PDF materials or feel free to contact us.

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The "Hydraulic Motor for Winches" is a product that compactly incorporates an internal pilot-type parking mechanical brake and a counterbalance valve. It boasts high operational reliability and durability developed over 30 years of market experience. Its application is for crane winches, and there are also cases of adoption for winches on truck-mounted cranes. 【Features】 ■ Compact ■ High reliability ■ High durability ■ Maximum pressure is 27.5 MPa *For more details, please refer to the PDF materials or feel free to contact us.

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The "Electric Butterfly Valve for Exhaust Gas" features a simple structure that employs a high-torque motor to drive the valve without the use of a gearbox. It adopts a cantilever valve structure, eliminating any accumulation grooves for condensate, thus preventing sticking due to condensate. A space is created between the valve and the motor, and the heat dissipation from the ADC material used in the motor attachment reduces thermal damage to the motor. 【Features】 ■ Strong against high temperatures and sticking ■ Gas temperature resistance up to 350℃ ■ Prevents condensate sticking ■ Simple structure without a gearbox *For more details, please refer to the PDF document or feel free to contact us.

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The "Electric and Hydraulic-Free Cab Tilt Cylinder" is a product with zero oil leakage due to its mechanical structure. No piping is required for the entire cab tilt system. It is equipped with a safety device to prevent descent and can be used for truck cab tilt devices. Additionally, it has a thrust of up to 20 kN and a stroke of 485 mm. Although it is developed for cab tilting, it can also be repurposed for other applications. Please feel free to contact us regarding construction machinery, agricultural machinery, railways, industrial machinery, logistics, and vehicle mounting. 【Features】 ■ Improved environmental performance ■ Mechanical integrated structure ■ No oil pump or piping required ■ Equipped with a safety device to prevent descent *For more details, please refer to the PDF materials or feel free to contact us.

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The "Oil-Free Electric Vacuum Pump" is an effective product as a negative pressure source for operating equipment that utilizes vacuum pressure. Core components such as the internal rotor and vanes are made from resin materials suitable for lubrication-free operation. In the automotive field, vacuum pressure has a proven track record as a negative pressure source for operating brake master boosters and turbo actuators. While it is developed for automotive use, it can also be applied to other purposes. If your company is looking to easily generate vacuum, we would appreciate it if you could contact us. 【Features】 ■ Clean lubrication-free drive ■ No oil supply piping required ■ Effective as a negative pressure source for operating equipment that utilizes vacuum pressure ■ Core components are made from resin materials suitable for lubrication-free operation *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our "Leveling Valve." The "Leveling Valve" is a valve that automatically controls the supply, retention, and exhaust of air through mechanical means to maintain the air spring at a constant height. It is used in tourist buses and trucks with air suspension, and has also been adopted for commercial washing machines, marine containers, and seismic isolation floors. It can be adjusted to meet various requirements and is equipped with technology that can respond immediately to customer needs! 【Features of the Leveling Valve】 ■ Maintains vehicle height at a constant level ■ Used in tourist buses and trucks with air suspension ■ Facilitates easy adjustment of the platform height of the cargo bed ■ Also adopted for commercial washing machines, marine containers, and seismic/earthquake-resistant/construction applications beyond vehicle use. ■ Can also be repurposed for equipment and factory/residential use! *For more details, please refer to the PDF document or feel free to contact us.

• container

We would like to introduce our "Air Suspension Control Device." The "Height Adjustment Valve" is a valve that controls the supply, retention, and exhaust of air within the air springs located under the vehicle body using a computer to drive the solenoid valve, maintaining the vehicle height at a constant level. It is used in sightseeing buses and trucks with air suspension, making it easy for the driver to adjust the platform height of the cargo area with a switch operation. Additionally, the "Leveling Valve" is a valve used to maintain a constant vehicle height and cab height by controlling the supply, retention, and exhaust of air within the air springs. It is compact, lightweight, and lever-shaped to accommodate various vehicles. 【Height Adjustment Valve Features】 ■ Drives and controls the solenoid valve to maintain a constant vehicle height ■ Used in sightseeing buses and trucks with air suspension ■ Facilitates easy adjustment of the cargo area platform height *For more details, please refer to the PDF materials or feel free to contact us.

• Vibration isolation, vibration control, and earthquake resistance construction

The "Cab Tilt Pump" is a hydraulic device that serves as the hydraulic source for lifting the truck driver's cabin during engine maintenance and other tasks. We offer both electric and manual drive options for the pump. Additionally, the "Cab Tilt Cylinder" is equipped with a safety device to prevent the cabin from falling in emergencies, ensuring safety while also making the operation of the safety device easy through hydraulic means. We also provide a "hydraulic latch" that automatically secures and releases the cabin, as well as a "combined tilt pump and cylinder unit." 【Product Lineup】 ■ Cab Tilt Pump (Electric and Manual) ■ Cab Tilt Cylinder ■ Hydraulic Latch ■ Combined Tilt Pump and Cylinder Unit *For more details, please refer to the PDF document or feel free to contact us.

• Car and bicycle parking facilities

We would like to introduce our product, "Power Shift." "Power Shift" is a device that amplifies the gear shift operation force of manual medium and large trucks and buses using air pressure, making the shift operation easier. It allows for smooth operation of devices that are heavy and have a large load by using the power of air as assistance. It can also be used as an auxiliary device for applications beyond just the transmission, making it versatile. Please feel free to contact us. 【Power Shift Features】 ■ Amplifies the gear shift operation force of manual vehicles using air pressure ■ Reduces the shift operation force ■ Supports input and output load settings suitable for the vehicle *For more details, please refer to the PDF document or feel free to contact us.

• Specially equipped vehicles

We would like to introduce our engine control device, the "Air Cylinder." This product is available in various types of air cylinders (single cylinder) and is designed to accommodate a range of applications, including engine stop, exhaust brake, and shifting. 【Features】 ■ Compatible with various applications such as engine stop, exhaust brake, and shifting. *For more details, please refer to the PDF document or feel free to contact us.

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This product is an actuator capable of stepless control, serving as a drive for variable capacity turbochargers and as an alternative to conventional air cylinders. In the event of a failure such as a motor disconnection, it adopts a fail-safe structure that returns to a safe position using spring force. It employs a brushless motor, ensuring high reliability, and features a screw structure on the motor rotor for miniaturization. 【Features】 ■ Development product ■ Capable of stepless control ■ Uses a brushless motor ■ Miniaturized with a screw structure on the motor rotor ■ Adopts a fail-safe structure that returns to a safe position using spring force in case of motor disconnection or other failures *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our engine control device, the "Bypass Valve for EGR Cooler." This switching valve bypasses the EGR cooler to prevent excessive cooling of low-temperature EGR gas during engine startup and low-temperature conditions, thereby reducing the emissions of HC and CO. By adopting a butterfly valve, it is compact and lightweight, as it is less affected by pressure changes before and after the valve. 【Features】 ■ Prevents excessive cooling of low-temperature EGR gas through the EGR cooler ■ Reduces HC and CO emissions with a switching valve that bypasses the EGR cooler ■ Utilizes a butterfly valve ■ Compact and lightweight due to reduced influence from pressure changes before and after the valve *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our engine control device, the "EGR Valve." Depending on the vehicle's operating conditions, this product returns an appropriate amount of exhaust gas from the engine back to the intake side, lowering the combustion temperature and reducing NOx emissions. By using motors and solenoids and innovating the valve shape, we have achieved a compact and lightweight design. Additionally, the "EGR Valve (leakage reduction type)" incorporates a controller for motor control, making it compact and well-suited for vehicle installation. 【Features】 ■ Lowers combustion temperature and reduces NOx ■ Utilizes motors and solenoids ■ Achieves compactness and lightweight design through innovative valve shapes *For more details, please refer to the PDF materials or feel free to contact us.

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This product is a vacuum source for vacuum servo brake systems. It is actively used as a vacuum source for vacuum equipment. It has a long track record for automotive applications. There are various capacity options available, allowing for proposals that meet customer needs! To reduce fuel consumption, we offer low-drive torque pumps in a diverse lineup tailored to vehicle weight and drive type. Not only for HV, EV vehicles, or idle-stop vehicles, but it also contributes to improving vehicle fuel efficiency by operating only when necessary. 【Features】 - For vacuum servo brake systems - Diverse lineup tailored to vehicle weight and drive type - Contributes to improving vehicle fuel efficiency by operating only when necessary *For more details, please refer to the PDF materials or feel free to contact us.

• Residential interior systems

The "Air Compressor" is a compressed air source for full air brakes or air-over-hydraulic brakes. It ranges from a single cylinder to inline two cylinders (L2), V-type two cylinders (V2), with a wide variety of capacities suitable for medium and large vehicles. Additionally, we offer a "two-stage compression type" that can handle high pressure and a "clutch-equipped" option that significantly reduces power consumption. 【Features】 ＜Two-Stage Compression Type＞ ■ Increases air pressure in stages to accommodate high pressure ■ Reduces driving torque and discharge air temperature ＜Clutch-Equipped＞ ■ By controlling the clutch ON/OFF, it is possible to significantly reduce power consumption *For more details, please refer to the PDF materials or feel free to contact us.

• Showcases (for general store use, freezing, refrigeration, heat retention, etc.)

Mitsuwa Seiki Co., Ltd. is committed to a consistent manufacturing process that encompasses market research, development, test driving, manufacturing, and sales. We mainly handle important control device components related to pneumatic and hydraulic equipment, engines, cab tilts, transmissions, brakes, engine exhaust gases, and air suspension, striving to manufacture products that are recognized worldwide in various fields such as automobiles and construction machinery. [Main Products] ■ Air Compressors ■ Vacuum Pumps ■ EGR Valves ■ Speed Limiters, etc. *For more details, please download the PDF or feel free to contact us.

• Other interior and exterior systems and units