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System and method for detecting a mechanical transmission failure
ActiveUS20250244203A1Machine part testingPower plant arrangements/mountingTorque transmissionHydraulic fluid
Methods and systems for detecting a torque transmission failure in an aircraft power plant are provided. The system comprises a hydrostatic transmission for transmitting torque between a first shaft and a second shaft using hydraulic fluid, an a failure detector including a sensor configured to detect a pressure change in the hydraulic fluid. The failure detector is configured to generate an output indicative of the torque transmission failure in response to the pressure change having crossed a threshold.
Owner:PRATT & WHITNEY CANADA CORP
Shock-resistant characteristic heavy-load electric cylinder based on hydraulic buffering mechanism and control method thereof
The invention provides an anti-impact characteristic heavy-load electric cylinder based on a hydraulic buffering mechanism and a control method thereof, and relates to the technical field of power driving systems. Comprising a motor, a controller and a speed reducing mechanism, and an output shaft of the speed reducing mechanism is connected with a lead screw; a piston, a piston rod and a lead screw nut connected to the lead screw are arranged in the cylinder barrel, the lead screw nut is connected with the piston, and the piston is connected with the piston rod. The interior of the piston rod is hollow so as to form a movable cavity for the lead screw to move; the piston is suitable for dividing the interior of the cylinder barrel into a rod cavity and a rodless cavity which are isolated from each other, and an oil through hole for communicating the rodless cavity with the movable cavity is formed in the piston; the hydraulic system is provided with a first oil way communicated to the rodless cavity and a second oil way connected to the rod cavity; the first oil way and the second oil way are connected to an oil supply system through a reversing valve. According to the scheme, the heavy load bearing capacity of the electric cylinder is improved.
Owner:HUAQIAO UNIVERSITY
Novel cross-country forklift
The invention discloses a novel cross-country forklift, which relates to the technical field of hydraulic hybrid power systems of engineering machinery and comprises the following modules: a power module for providing driving power of the whole forklift; the power division module is used for realizing double-flow power division and convergence and comprises an integrated mechanical gear speed change unit and a hydraulic stepless speed change unit; the mechanical transmission module is used for transmitting the power of the mechanical direct drive branch to the drive part; the hydraulic execution module is used for realizing a dynamic characteristic cooperative control technology and matching the flow of a hydraulic system with a mechanical gear speed ratio by establishing a speed-torque-pressure three-parameter coupling model; a composite speed change module; and a control and management module. By adopting double-flow power division and convergence, power division of 70% mechanical energy direct drive and 30% hydraulic energy speed regulation is achieved, and the traditional transmission efficiency bottleneck is effectively broken through. And under the rugged terrain and the variable-load working condition, the energy utilization rate can be increased, fuel consumption is reduced, and the whole machine has higher economical efficiency and durability.
Owner:LAIZHOU DAYANG MASCH MFG CO LTD
Front drive axle assembly of hydraulic stepless speed change harvester
The utility model belongs to the technical field of agricultural machinery transmission systems, and particularly relates to a front drive axle assembly of a hydraulic stepless speed change harvester, which comprises a gearbox body, a first shaft, a second shaft, a third shaft, a left half shaft and a right half shaft of a differential assembly are rotatably connected in the gearbox body, and the first shaft is in transmission connection with an output end of a hydraulic stepless speed change motor. The first shaft is sleeved with a first shaft gear A, the second shaft is sleeved with a first-stage speed reduction driven gear, the second shaft and the third shaft are in transmission fit through a gear position gear assembly, the third shaft is sleeved with a third shaft gear A, a left half shaft and a right half shaft of the differential mechanism assembly are in transmission connection with the tail end transmission box assembly, and one end of the third shaft extends out of the gearbox body to form a four-wheel drive reserved end. According to the utility model, a transmission mechanism which is driven by the hydraulic stepless variable-speed motor and is provided with multi-gear speed change is adopted, so that the requirements of simple operation and stable and reliable transmission are met, and a four-wheel-drive reserved end which can be in transmission fit with a four-wheel-drive transfer case is reserved, so that the complete machine can be ensured to have enough driving force.
Owner:WENLING MINGHUA GEAR
Transmission system of high-power petroleum fracturing truck
The invention discloses a high-power petroleum fracturing truck transmission system which comprises a torque converter and a gearbox which are integrated, and the gearbox is of a fixed shaft and planet structure. The torque converter comprises a shell a, a torque conversion mechanism is arranged in the shell a, and the torque conversion mechanism is connected with an input assembly; the gearbox comprises a shell b, the shell b is fixedly connected with the shell a, a parallel shaft transmission system in transmission connection with the output end of the torque conversion mechanism and a planet wheel transmission system in transmission connection with the output end of the parallel shaft transmission system are arranged in the shell b, and the output end of the planet wheel transmission system is connected with the output assembly; the gear of the parallel shaft transmission system is three, the gear of the planet wheel transmission system is three, and the gear of the parallel shaft transmission system is nine. The advantages of fixed shaft transmission and planetary transmission are combined, balance is carried out, the reliability is high, meanwhile, the weight can be reduced, and the transmitted torque can be improved. And the torque converter and the gearbox are integrally arranged, so that the overall size is reduced, and the mounting space is saved.
Owner:PINGHU LIFENG INTELLIGENT TECHNOLOGY CO LTD
Variable flow plunger pump
The invention relates to the technical field of plunger pumps, in particular to a variable flow plunger pump which comprises a driving unit, a plurality of variable pumps, a plurality of variable flow executing mechanisms and a transmission mechanism. The variable pumps are connected with the driving unit; the variable flow executing mechanisms are connected with the variable pump. The transmission mechanism comprises a plurality of driving transmission parts and a driven transmission part, the driving transmission parts are located on the outer side of the driven transmission part and connected with the driven transmission part, and the driving transmission parts are connected with the variable flow executing mechanism. According to the variable-flow plunger pump, the variable pump is driven by the driving unit to output variable-flow hydraulic oil, large-range real-time adjustment of flow can be achieved through cooperation of the variable pump and the variable-flow executing mechanism and variable-flow control, adjustment is accurate, and large-torque output of the variable-flow executing mechanism at different rotating speeds is guaranteed; the multiple driving transmission pieces drive one driven transmission piece to rotate, stress is uniform, the abrasion loss is reduced, and the structure is more compact.
Owner:BEIJING TIANMA INTELLIGENT CONTROL TECHNOLOGY CO LTD +1
Drive unit
To achieve a plurality of forward moving modes without complicating a structure.SOLUTION: A torque converter amplifies torque of a first rotation direction. A first torque transmission path 6a transmits torque through a torque converter 3. A second torque transmission path 6b transmits torque without through the torque converter 3. A first gear train 41 outputs the torque directed in the first rotation direction as forward torque. A second gear train 42 outputs the torque directed in the first rotation direction as reverse torque. A controller 9 controls a motor 2 so as to rotate in the first rotation direction and at the same time, outputs torque via the first torque transmission path 6a and the first gear train 41 in a first forward moving mode, and controls the motor 2 so as to rotate in a second rotation direction and at the same time outputs the torque through the second torque transmission path 6b and the second gear train 42 in a second forward moving mode.SELECTED DRAWING: Figure 1
Owner:EXEDY CORP
Method for forming a double layer wet friction material with cellulose layer
A method of making a wet friction material includes coating a first outer surface of a cellulose layer with a friction coating; placing a matrix of fibers and filler particles on a second outer surface of the cellulose layer; and saturating the matrix of fibers and filler particles with a binder and curing the binder to join the matrix of fibers and filler particles together to form a wet friction material base layer and to join wet friction material base layer to the second outer surface of the cellulose layer.
Owner:SCHAEFFLER TECHNOLOGIES AG & CO KG
pneumatic power unit
The pneumatic power device includes an annular gas storage vessel (1), a starting system, and an output system. A plurality of cylinders (2) are uniformly arranged around the inner wall of the annular gas storage vessel, and the cylinder body cavities of the cylinders are connected to the cavity of the annular gas storage vessel. The piston rods (3) of the cylinders are provided with racks (4). The starting system includes a power source, a drive unit (15), a speed reducer / torque increaser mechanism, and a cam (5). The power source is electrically connected to the drive unit, and the drive unit is power-transmittingly connected to the cam by the speed reducer / torque increaser mechanism. The piston rod ends of each cylinder abut against the cam. The output system includes a one-way transmission mechanism and an output shaft (10). The one-way gear (7) at the input end of the one-way transmission mechanism is meshed with the rack, and each rack is power-transmittingly connected to the output shaft by a one-way transmission mechanism. Only when the piston rods of the cylinders are extended does the rack and the output shaft rotate. The pneumatic power plant has little dependence on traditional fuels and effectively avoids dependence on thermal energy resources, reducing emissions, saving energy and being environmentally friendly, while at the same time solving the problems of energy crisis and air pollution.
Owner:JILIN XIUFU PNEUMATIC POWER CO LTD
Transmission structure
[Problem] A transmission structure that may improve a traveling feeling when a drive traveling state is interrupted in traveling and then the drive traveling state is resumed is provided. [Solution] A control device actuates a clutch actuator so that only a clutch mechanism on a most downstream side in a transmission direction in a selected shift gear is brought to a disengaged state when receiving a power cut-off signal in a state in which a traveling state change member is subjected to a forward operation or a reverse operation, and, actuates the clutch actuator so that only the clutch mechanism on the most downstream side in the transmission direction in the selected presumed shift gear is brought to a disengaged state based on a traveling state, and in addition, actuates a gear shift actuator so that a gear ratio of a continuously variable transmission mechanism that realizes a vehicle speed at that time point in the presumed shift gear is obtained while the power cut-off signal is valid, and actuates the clutch actuator so that the clutch mechanism on the most downstream side in the transmission direction in the presumed shift gear at that time point is brought to an engaged state when a cancel signal for canceling the power cut-off signal is input.
Owner:KANZAKI KOKYUKOKI MFG
Power transmission device
A torque converter includes a lock-up device, an urging member, a cover, an impeller, a turbine, a first hydraulic chamber, and a second hydraulic chamber. The lock-up device includes a clutch part and a piston. The urging member urges the piston toward the clutch part. A first oil pathway communicates with the first hydraulic chamber. A second oil pathway communicates with the second hydraulic chamber. A switch is provided. In a first switch position, hydraulic oil is supplied to the first hydraulic chamber through the first oil pathway. In a second switch position, hydraulic oil is supplied to the second hydraulic chamber through the second oil pathway. The piston presses the clutch part when the hydraulic oil is supplied to an interior of the first hydraulic chamber. The piston releases the clutch part when the hydraulic oil is supplied to an interior of the second hydraulic chamber.
Owner:EXEDY CORP
Method, device and equipment for processing clamping stagnation of hydraulic control loop of hydraulic torque converter
The invention discloses a method, a device and equipment for processing clamping stagnation of a hydraulic control loop of a hydraulic torque converter. The method, the device and the equipment are used for realizing self-cleaning of clamping stagnation of the hydraulic control loop of the hydraulic torque converter. The method comprises the steps that vehicle gear information, the vehicle speed, the engine rotating speed and the turbine rotating speed are obtained; when the vehicle gear information, the vehicle speed, the engine rotating speed and the turbine rotating speed meet the target conditions, it is determined that the hydraulic torque converter hydraulic control loop is in a clamping stagnation state; and when the hydraulic control loop of the hydraulic torque converter is in a clamping stagnation state, the hydraulic torque converter is controlled to control the current of the electromagnetic valve to change in a pulse form.
Owner:SAIC MOTOR
Novel 20Kw aluminum alloy PTO gear box
The novel 20Kw aluminum alloy PTO gear box comprises a front box cover, an input shaft and a large gear, a rear box cover is installed on the outer side of the rear end of the front box cover, a vent valve is arranged in the upper end of the front box cover in a communicating mode, and an output shaft is installed in the upper end of the rear box cover; an input shaft is installed in the lower end of the front box cover in a penetrating mode, and the rear end of the input shaft is connected with a bearing. A large gear is installed on the outer side of the input shaft. The utility model belongs to the technical field of PTO gear boxes, and aims to solve the problems that in the prior art, a hydraulic system of a tractor is small in flow, a power output shaft and a gear pump are difficult to install, and a small-power gear box is insufficient in power, so that the flow of the gear pump connected with the small-power gear box is insufficient. The technical effect is that the problems that the flow of a hydraulic system of the tractor is small, the power output shaft and the gear pump are difficult to install, and the flow of the gear pump connected with a small-power gear box is insufficient due to insufficient power of the small-power gear box are effectively solved.
Owner:SHANGHAI KORESON MASCH CO LTD
A hydraulic torque converter guide wheel based on drainage hole to inhibit cavitation
This invention belongs to the field of fluid machinery technology, specifically relating to a hydraulic torque converter guide wheel that suppresses cavitation based on a guide hole. It includes an outer guide wheel ring, an inner guide wheel ring, and multiple guide wheel blades evenly distributed circumferentially between the outer and inner guide wheel rings. The outer guide wheel ring, inner guide wheel ring, and guide wheel blades are an integral structure. A main guide hole penetrating the guide wheel blade is formed at its tip along its extension direction. An end hole communicating with the main guide hole is formed on the outer or inner guide wheel ring. A flow guiding unit is provided on the guide wheel blade, and the flow guiding unit includes multiple flow guiding holes evenly distributed along the extension direction of the guide wheel blade, which communicate with the main guide hole. This invention compensates for the pressure in the cavitation region at the blade tip by introducing impeller gap flow field pressure, thereby suppressing cavitation caused by local low pressure.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY
Work vehicle
To easily warm up lubricating oil in a transmission case (12) housing a transmission device (5). A work vehicle (1) includes a vehicle body (3) provided with a travel device (7); a prime mover (4) provided in the vehicle body (3); a transmission device (5) capable of speed-changing a driving force from the prime mover (4) and transmitting the driving force to the travel device (7); a transmission case (12) housing the transmission device (5) and being filled with lubricating oil; and a control device (120) capable of switching between a warm-up operation mode in which a gear of the transmission device (5) is rotated in a state in which transmission of power from the transmission device (5) to the travel device (7) is blocked and a travel operation mode in which the gear is rotated in a state in which the power is transmitted from the transmission device (5) to the travel device (7).
Owner:KUBOTA CORP
Positive pressure reset type screw liquid conversion type gap adjusting device
The invention belongs to the technical field of composite material preparation machinery, and particularly relates to a positive pressure reset type screw liquid conversion type gap adjusting device which comprises a fixed body, a frame body is installed on one side of the fixed body, a movable body is arranged on the side, away from the fixed body, of the frame body, a mechanical jacking mechanism is arranged on the frame body, and a transverse hole is formed in the side, close to the movable body, of the frame body. A fixed column is arranged in the transverse hole in a sealed and sliding mode, the fixed column moves towards the side close to the moving body through a mechanical jacking mechanism and abuts against the moving body, and a gas pressure reset device is further arranged on the frame body and used for driving the fixed column to move in the direction away from the moving body. The device has the reset function and can meet the no-load adjustment function.
Owner:WEIHAI GUANGWEI PRECISE MACHINERY CO LTD
Multi-leaf type axial volume variable suction and discharge device and variable speed drive system thereof
ActiveCN114060268BRotary piston pumpsRotary piston liquid enginesAutomatic transmissionMechanical engineering
The present application provides a kind of multi-leaf type axial volume variable suction and exhaust device composed of driving system, mainly in the inside of a impeller type suction and exhaust device, with a multi-blade rotor as the center and a fixed wall piece, a movable leaf chamber cover and a movable wall piece, together into a multi-bias leaf chamber area leaf chamber body that can change the leaf chamber volume along the multi-blade rotor, and let the total amount of fluid suction and exhaust of the suction and exhaust device tend to be equal, and at least two of the suction and exhaust device are connected, combined into a closed loop system with active drive and passive drive, and based on driving force and load resistance will automatically reach force balance, and the relationship between the leaf chamber volume of the suction and exhaust device and the rotational speed is inversely proportional, so that the rotational speed between the active suction and exhaust device and the passive suction and exhaust device is the best driving ratio, and then achieve the optimal stepless automatic transmission drive.
Owner:CH CREATIVE CO LTD
METHOD FOR ADJUSTING THE DRIVETRAIN TORQUE OF A HYBRID VEHICLE
A method for controlling a torque output of a hybrid power machine, comprising the following: during a temporary increase in torque in response to a change in the target output torque of a powertrain (200), setting a power machine output torque and a motor output torque in response to a change in the target output torque of the powertrain (200), Adjusting the motor output torque in response to a response to a speed of a drive wheel (285) of a torque converter (206), characterized by Adjusting the power machine output torque for a power machine torque error in response to the settings of a motor torque.
Owner:FORD GLOBAL TECH LLC
Method for actuating a hydrostatic drive
The present invention relates to a method for controlling a hydrostatic drive (1) of a mobile working machine, wherein the hydrostatic drive is provided with a first hydraulic machine (4) with adjustable displacement volume and with a second hydraulic machine (6) and a third hydraulic machine (8), each with adjustable displacement volume, wherein the second hydraulic machine (6) is rotatably connected to the at least one driven wheel or chain or axle by means of a coupling (38), wherein the third hydraulic machine (8) is rotatably connected to the at least one driven wheel or chain or axle, wherein the coupling is controlled as a function of a travel speed of the mobile working machine, wherein the method comprises the following steps: a. detecting a travel command corresponding to a target travel speed or a value dependent thereon; b.Calculation of a threshold value for the travel speed of the working machine at which a switching of the clutch (38) is to take place; c. Whereupon, in the event that the travel command corresponds to an absolute value of the target travel speed of the working machine which is less than a specified value, the threshold value calculated in step b. is further adjusted taking into account an actual deceleration of the working machine and a switching time.
Owner:ROBERT BOSCH GMBH
Pressure plate with radially extending connecting elements
Owner:SCHAEFFLER TECHNOLOGIES AG & CO KG
Motor anti-suck method, device and hydrostatic drive vehicle
The application provides a motor anti-vacuum method and device and a hydrostatic drive vehicle. The hydrostatic drive system comprises a pump and a motor and is used for transmitting power between an engine and a driving wheel. The method comprises the following steps: in response to the operation of stepping on a brake pedal, an angle change rate of the brake pedal is obtained, the angle change rate being a ratio of a rotating angle of the brake pedal to a rotating time length of the brake pedal; and in the case that the angle change rate is greater than or equal to a predetermined threshold value, the displacement of the pump is controlled to be 0, and the motor is controlled to increase the displacement at a predetermined rate until the maximum displacement of the motor is reached, thereby solving the problem of high cost of an oil supplement pipeline for preventing the motor from being in a vacuum state in the prior art.
Owner:WEICHAI POWER CO LTD
Torque converter
A torque converter, which may be found in an automotive transmission, is provided. In some examples, the torque converter includes a shell that extends about an axis of rotation, a core that extends about the axis of rotation, and a plurality of curved blades that extend contactedly from the shell to the core. At least one blade of the plurality of curved blades may include a non-ruled surface. The at least one blade of the plurality of curved blades may narrow as it extends from the shell to the core.
Owner:ALLISON TRANSMISSION INC
Hydrostatic transmission and methods for braking with it
Hydrostatic transmission for a drive system, comprising a drive shaft (4) of a primary unit (1) that can be coupled to an internal combustion engine of the drive system and a secondary unit (2) that can be coupled to an output of the drive system, wherein the two units (1, 2) are fluidically connected to each other via two working lines (10) of a closed circuit, and wherein the primary unit (1) has an adjustable swivel angle (angle_pump) and an adjustable displacement volume (Vg_pump) that can be controlled by an electrical control unit (8) when the hydrostatic transmission is braked, characterized by a controller (38;138), from which a correction value (Vg_pump_add_incr) for the swivel angle (angle_pump) or the displacement volume (Vg_pump) can be output, wherein the correction value (Vg_pump_add_incr) can be added to a swivel angle (angle_pump_brake) or displacement volume (Vg_pump-brake) pre-controlled by the control unit (8), wherein an input variable of the controller (38; 138) is a speed difference (Δn_eng) between an actual speed (n_eng_act) of the internal combustion engine or a quantity derived therefrom (n_pump_act) and a maximum speed (n_eng_max) of the internal combustion engine or a quantity derived therefrom (n_pump_max).;
Owner:ROBERT BOSCH GMBH
Oilfield pressure pumping system with slow speed and high pressure fracturing fluid output
An oilfield pressure pumping system is configured to perform a preliminary' fracturing stage or operation at a high pressure but slow speed before initiating normal fracturing. The oilfield pressure pumping system includes an auxiliary underdrive system that can drive the transmission at a slower input speed that can be provided by an idle speed of the power unit's engine to facilitate different fracturing modes, including a preliminary fracturing mode during a slow speed / high pressure preliminary fracturing stage. The auxiliary underdrive system may include a hydrostatic transmission driven by the engine and which, drives the transmission at an underdrive speed that would correspond to a sub-idle engine speed driving the transmission.
Owner:TWIN DISC INC
Lock-up clutch control device
Provided is a lock-up clutch control device that suppresses vibration caused by a clearance collision in a drive transmission system by improving hydraulic pressure control of a lock-up clutch when a driving load (road load) is large although an accelerator pedal is in a slow-down state, and the driving load (road load) is not large even if the accelerator pedal is in a slow-down state. The accelerator pedal is further depressed from a state in which the vehicle is decelerated (further depressed). In this lock-up clutch control device, when an accelerator pedal is depressed slowly and a vehicle is traveling at a reduced speed, the hydraulic pressure of a lock-up clutch is lower than the hydraulic pressure when normal lock-up clutch control is performed. As a result, it is possible to suppress vibrations caused by a clearance collision in the drive transmission system when the accelerator pedal is further depressed thereafter.
Owner:TOYOTA JIDOSHA KK
Overspeed safeguards in hydraulically controlled fuel boost pump
A hydraulic motor-driven fuel boost pump includes redundant safeguards against overspeeding the impellers. A flow limiter limits the amount of hydraulic fluid that can be supplied to the hydraulic motor, thereby limiting the torque that can be applied to the impellers. A control valve also transitions between a non-restrictive operating state and a restrictive operating state. In the restrictive operating state the control valve regulates the displacement of the swash plate when in the non-restrictive operating state. The control valve does not counter the bias of the swash plate control spring when in the restrictive operating state.
Owner:EATON INTELLIGENT POWER LTD
Six-gear transmission gearbox for mine vehicle
The six-gear transmission gearbox for the mine vehicle comprises a shell, an input shaft, a first transmission shaft, a second transmission shaft, a third transmission shaft, a fourth transmission shaft, a fifth transmission shaft and an output shaft are arranged in the shell, and the input shaft, the second transmission shaft, the fourth transmission shaft and the output shaft are parallel to one another and are arranged in a coplanar mode. The first transmission shaft and the input shaft are coaxially arranged, the third transmission shaft and the second transmission shaft are coaxially arranged, the fifth transmission shaft and the fourth transmission shaft are coaxially arranged, an input gear is arranged on the input shaft, a first clutch is arranged between the input shaft and the first transmission shaft, and a second clutch is arranged between the third gear and the second transmission shaft. A third clutch is arranged between the second transmission shaft and the third transmission shaft, a fourth clutch is arranged between the fifth gear and the third transmission shaft, and a fifth clutch is arranged between the fourth transmission shaft and the fifth transmission shaft. According to the six-gear transmission gearbox for the mine vehicle, the symmetry and the stability of the overall structure are improved, and the manufacturing difficulty is reduced.
Owner:CHANGSHA ZHONGCHUAN TRANSMISSION
Drive system for a vehicle
The present invention relates to a drive unit (2) for a vehicle (100) comprising a drive (6) and an output (5). The drive unit (2) includes a transmission assembly (7) with a variator (10) for providing multiple driving ranges, a central shaft (36), and an output shaft (42). Furthermore, the drive unit (2) comprises a gearshift transmission (8) with a forward shift element (46) for mechanically connecting the output shaft (42) to the output (5) with a first gear ratio (48) for forward travel. It also includes a shift device (55) for selectively switching between a second gear ratio (53) for forward travel and a gear ratio (49) for reverse travel. The drive unit (2) also includes a reverse shift element (47) for mechanically connecting the output shaft (42) to the shift device (55).The drive device (2) has a double switching element forming the forward switching element (46) and the reverse switching element (47).
Owner:ZF FRIEDRICHSHAFEN AG
Launching device
To suitably attach a rotor onto an outer peripheral surface of a fluid coupling.SOLUTION: A starting device 1 includes a fluid coupling 2, an electric motor 3, and a regulation mechanism 4. A rotor 31 is disposed on the radial outside of the fluid coupling 2. The regulation mechanism 4 regulates relative rotation between the fluid coupling 2 and the rotor 31. The regulation mechanism 4 has a first key groove 41, a second key groove 42, and a key body 43. The first key groove 41 axially extends on an inner peripheral surface of the rotor 31. The second key groove 42 axially extends on an outer peripheral surface of the fluid coupling 2. The second key groove 42 is shorter than the first key groove 41. The key body 43 has a first key portion and a second key portion. The first key portion is fitted in the first key groove 41, and the second key portion is fitted in the second key groove 42.SELECTED DRAWING: Figure 1
Owner:EXEDY CORP
