C-Stone’s new wet dual clutch transmission has a unique parallel shaft arrangement with a planetary gear set which enables a compact and light-weight transmission. The transmission efficiency is further improved by C-Stone’s highly efficient dual clutch and gear actuating system. With our technology, we can design compact, light-weight, front and rear-wheel drive DCTs.

C-Stone’s high-efficiency automatic transmission is compact and light compared to existing automatic transmissions while having high efficiency. It has a planetary-chain type power transmission structure. Our Power Pistons are used in the clutches and brakes to achieve a low line pressure control system.
A new concept starting device developed by C-Stone may also be used when necessary. Despite the advent of the electric vehicle era, the automatic transmission is still expected to have the biggest market share in the global market for the next two decades.

C-Stone’s multi-mode power transmission device is a highly efficient multi-functional power transmission device which satisfies various input and output conditions and requirements. It can be used for various applications in many industrial fields.
It has a double one-way clutch structure to satisfy multi-mode power transmission with various input and output conditions.
A hydraulic or an electronic clutch and brake are used to control the device.

C-Stone’s triple clutch is used in a P2 module in hybrid vehicles with DCTs. It is composed of a wet dual clutch and an engine clutch. The triple clutch is especially necessary for high-efficiency hybrid DCTs. It has an excellent total length to torque capacity ratio and is installed in a very small space. Also, it uses a high-efficiency clutch actuator to improve the transmission efficiency.

Compared to existing dual clutches, C-Stone’s wet dual clutch has a simple power transmission flow and a fewer parts to reduce the production cost.
The wet dual clutch is designed with a device for minimizing the clutch drag. It has an excellent ratio of torque capacity to total clutch length and has an ideal structure that distributes the clutch actuation loads evenly. Both of hydraulic and electric actuators are applicable.

C-Stone’s dry dual clutch remarkably reduces transmission length. The torsional damper is also integrated into the clutch to reduce the production cost. It has a superb torque capacity to total clutch length ratio. An electric actuator can be used in this new dry dual clutch.

C-Stone’s Power Piston allows for smaller, low inertia, highly efficient clutches. It also allows for various functional features and improvements in both efficiency and performance of transmissions.
With our innovative high-efficiency clutch, the clutch torque capacity is increased without increasing the clutch size. Also, the length, weight, and rotational inertia of the clutch can be reduced. It decreases drag loss and reduces the hydraulic supply pressure.

C-Stone’s new starting device for vehicles and industrial machines can replace a torque converter. It has the smooth starting features of a torque converter and the efficiency of a mechanical clutch.
Our hydro-static starting device needs neither the complex lockup clutch nor the torsion damper, unlike the torque converter. It provides excellent starting performance with a simple control system and has fewer parts to reduce the production cost.

C-Stone’s new hydraulic brake has greatly improved braking capability due to the Power Piston.
By applying the Power Piston, braking torque can be increased by 30-50% within the existing packaging space.

C-Stone’s variable force disc spring provides a simple centrifugal force compensation device for clutch or power transmission devices. Compared to existing springs that only provide constant load, our springs provide variable spring load depending on the rotational speed. The disc spring load is changed by balance weights.

C-Stone’s new balancing module is used to cancel the centrifugal force generated by the piston in a rotating clutch. With our new concept balancing module, clutches can be designed more compactly by removing balancing oil paths. Our new balancing module uses a polymer-filled balancing chamber with an integrated return spring.

C-Stone’s variable water pump changes the delivery depending on the engine operating conditions. The driving torque of the pump can be minimized to reduce the engine power loss. It has selectable Neutral-First-Second modes and the control is performed by an electronic solenoid. Our variable water pump is relatively compact compared to existing water pumps

C-Stone’s innovative hydraulic actuator is used for controlling the dual clutch. Our hydraulic dual clutch actuator provides great actuating force at low pressure with C-Stone’s innovative double CSC (concentric slave cylinder). It improves transmission efficiency and reduces total transmission length.
Displacement sensors for precision control are attachable.

C-Stones electric motor dual clutch actuator is a BLDC motor actuator for dry and wet dual clutches. It has high reduction gear ratios for small motors and is designed in a very compact manner to reduce the transmission length.
The electric motor dual clutch actuator is an on-demand actuator incorporated with displacement sensors for precision control of the clutch.

C-Stone’s hydraulic gear actuator is applicable to DCTs and AMTs. It performs gear selection and shifting simultaneously through hydraulic cylinders and control solenoid valves. Our hydraulic gear actuator provides great actuating force with low hydraulic pressure and has displacement sensors attached for precision shift force control.

C-Stone’s electric motor actuator is a BLDC motor driven actuator for a DCTs or AMTs. The gear selection and shifting are performed simultaneously by a drum cam. Since the BLDC motor is installed inside the drum cam, a very compact shifting mechanism can be achieved.
In addition, this product can be used as a driving unit for electric vehicles, electric scooters, electric bicycles, etc. Great driving torque is obtained within a small installation space and the rotation speed can be controlled precisely.

C-Stone has developed a new concept dual piston module actuated by hydraulics or pneumatics. With a hydraulic Power Piston, the actuating force is increased by 30-70% and is applied to single or multi-plate clutches or brakes.
It increases the torque and heat capacity and reduces drag loss as well as the supply pressure. With our Hydraulic Power Piston, a highly efficient, compact, light-weight and low inertia clutch system can be achieved. Also, the size and power loss of the oil pump can be reduced thereby improving transmission efficiency.

C-Stone’s mechanical Power Piston is a new-type of hydraulic and pneumatic piston that has a mechanical load amplifying device. With our mechanical Power Piston, the piston-actuating force is increased by 20-50% and is applicable to single or multi-plate clutches and brakes. It increases the torque and heat capacity, reduces the drag loss, and lowers the supply pressure.
With a Mechanical Power Piston, a highly efficient, compact, light-weight, low inertia clutch or brake system is achievable. Also, the size and power loss of the oil pump can be reduced thereby improving transmission efficiency.

C-Stone’s lever disc is a steel disc with the load amplifying device attached. With our lever disc, the actuating force of the piston or plunger can be increased by 20-50%. It is applicable to clutches, brakes, plungers etc., that are actuated by oil or air.
A small, light-weight, high load capacity actuator can be achieved with the lever disc. The greater actuation force is obtained even with lower hydraulic or pneumatic pressure.

C-Stone’s new concept torsion damper is for manual transmissions. It is inserted and installed inside the transmission input or output shaft and it reduces the transmission length and cost. It has an innovative hexagonal axis energy dissipation device. Any existing DMF (dual mass flywheel) can be replaced by our dynamic torsion damper.

C-Stone’s bi-axial torsion damper is used in a new concept manual transmission with two input shafts. With a single damper, the damped engine torque is delivered to two input shafts in the transmission. It has a DMF-type damper with two output hubs. It can reduce the total length and cost of the transmission.

C-Stone’s variable hysteresis torsion damper provides optimal damping characteristics for various driving conditions in vehicles and engines. Our variable hysteresis torsion damper is incorporated with a non-contact current supply device and a solenoid. It can be mounted on the engine flywheel and the damping force is controlled by the solenoid. It provides excellent NVH performance under various driving conditions.