JPH0683526U - Vehicle parking device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To reduce the operating force when releasing the parking and prevent the shift lever from accidentally moving while traveling,
Prevent damage to the parking pole or parking gear. A fluid pressure cylinder 9 is provided on an operating shaft 5 that is provided with a cam 8 that operates in a direction to engage a parking pole 3 with a parking gear 2 and that moves forward and backward by a shift lever 6.
A piston 11 fixed to the operating shaft 5, a fluid pressure supply passage 21 for supplying a fluid to the pressure chamber 23 so as to press the piston 11 when parking is released and urge the operating shaft 5 in the parking releasing direction, When the parking operation is performed by the axial movement of the operating shaft 5, the fluid supply passage 21 is closed, and the valve body 14 that opens when the parking is released is built in, and the fluid pressure is supplied to the tip of the operating shaft 5 to park the operating shaft 5. A reaction force chamber 30 that restrains axial movement in the operating direction is provided, and a control valve 37 that leaks the fluid pressure of the reaction force chamber 30 to a low pressure side and reduces the pressure is provided as the traveling speed of the vehicle decreases.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a parking device that applies braking when a vehicle is stopped.

[0002]

[Prior art]

 A conventional general parking device is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-139666, in which a parking gear attached to an output shaft, a parking pole which is engaged with and disengaged from the parking gear, and a parking pole which is engaged with the parking gear. It is composed of an actuating shaft having a tubular cam in the mating direction.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional device, there is a problem that the operation force for releasing the parking for releasing the contact of the cylindrical cam that is in pressure contact with the parking pole is heavy, especially when the vehicle is running in the parking released state, especially in medium-sized and large-sized vehicles. If the operating shaft is accidentally moved in the parking direction, the parking pole or parking gear may be damaged.

An object of the present invention is to provide a vehicular parking apparatus that eliminates the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention is characterized in that a parking gear attached to an output shaft, a parking pole engaged with and disengaged from the parking gear, and a direction in which the parking pole is engaged with the parking gear. In a parking device for a vehicle, which includes an operating shaft that moves forward and backward by a shift lever with a cam that operates in the same direction, a piston fixed to the operating shaft and the parking shaft is released by pushing the piston when releasing the parking. Fluid pressure supply passage for supplying fluid to the pressure chamber so as to urge it in the direction, and a valve body for closing the fluid supply passage during parking operation due to axial movement of the operating shaft and for opening the valve body when parking is released. A cylinder is provided on the working shaft, and fluid pressure is supplied to the tip of the working shaft to move the working shaft in the parking direction. A reaction force chamber to restrain provided is a fluid pressure of said reaction force chamber due to the decrease in the traveling speed of the vehicle leaking to the low pressure side that includes a control valve for pressure reduction.

[0006]

[Action]

 With the above configuration, the valve element closes the fluid supply passage by the axial movement of the operating shaft during parking operation, and the pressing force in the parking release direction of the piston is reduced to zero for smooth parking operation. The passage is opened and the piston is pressed in the parking release direction to assist the operating shaft and reduce the parking release operation force. In addition, fluid pressure is supplied to the reaction force chamber at the tip of the actuating shaft during traveling while parking is released, and the axial movement of the actuating shaft in the parking actuating direction is restricted.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is an output shaft of a transmission, to which a parking gear 2 is attached. A parking pole 3 is engaged with and disengaged from the parking gear 2. The parking pole 3 is axially supported by a casing (not shown) so as to be vertically movable around a support shaft 4.

Reference numeral 5 denotes an actuating shaft, which is connected to the shift lever 6 via a wire 7 and is a person who operates the shift lever 6 to perform axial movement in a leftward direction and a rightward direction in the figure. A cam 8 for rotating the parking pole 3 in the direction of the parking gear 2 is fixedly mounted on the operating shaft 5.

A fluid pressure cylinder 9 is provided on the working shaft 5, and a piston 11 fixedly mounted on the working shaft 5 is provided in the fluid pressure cylinder 5, and the piston is pressed when the parking is released to push the working shaft 5. A fluid pressure supply passage 21 for supplying fluid to the pressure chamber 23 so as to urge the valve 5 in the parking release direction, and a valve which is closed when the parking operation is performed by the axial movement of the operating shaft 5 and is opened when the parking is released. It has a body 14 inside.

The configuration of the fluid pressure cylinder 9 will be described in more detail. As described above, the pressure chamber 23 is formed by the piston 11 fixedly mounted on the actuating shaft 5, and in order to supply the fluid pressure to the pressure chamber 23, the fluid pressure tank 17 and the introduction port 18 connected to the pipe line, The outlet port 19, a fluid supply passage 21 communicating from the outlet port 19 to the supply port 20 of the pressure chamber 23, and a discharge port 22 for discharging the fluid pressure in the pressure chamber 23 are provided.

The valve structure in which the fluid supply passage 21 is closed during the parking operation and opened when the parking is released is a valve structure in which the valve seat of the tapered hole 15 is formed between the introduction port 18 and the discharge port 19. The body 14 is slidably fitted to the actuating shaft 5 with its retracted end regulated by a stopper 16, and a taper shaft portion 13 that contacts the taper hole 15 of the valve body 14 is formed on the working shaft 5. . Reference numeral 12 is a seal portion that faces the front surface of the valve body 14.

A reaction force chamber 30 is provided at the tip of the operating shaft 5, and a constant fluid pressure is supplied to the reaction force chamber 30 by a first pump 31. The reaction force chamber 30 has a discharge passage 32 for leaking the fluid pressure to the low pressure side. The discharge passage 32 leaks the fluid pressure of the reaction force chamber 30 to the low pressure side as the traveling speed of the vehicle decreases. A control valve 37 for reducing the pressure is provided.

The control valve 37 includes a ball valve 33 that opens and closes the discharge passage 32, and a plunger 34 that moves backward by a spring 35 and moves forward by fluid pressure to push the ball valve 33 in a closing direction. , Is connected to a second pump 36 that exerts fluid pressure on the plunger 34.

The first pump 31 is operated by the crankshaft of the engine, and the fluid pressure is always supplied to the reaction force chamber 30 when the engine is rotating. The second pump 36 is operated by the output shaft of the transmission, and its output pressure is set higher than the output pressure of the first pump 31 by the amount of the compression acting force of the spring 35.

The operation of the parking device configured as described above will be described. In the parking operation, by moving the shift lever 6 in the P direction, the operating shaft 5 axially moves to the left in the figure, and the cam 8 pushes the parking pole 3 upward to engage the parking gear 2 and rotate the output shaft 1. Restrain.

At this time, the axial movement of the actuating shaft 5 to the left causes the tapered shaft portion 13 to come into close contact with the tapered hole 15 of the valve body 14 to close the passage between the inlet port 18 and the outlet port 19, and the pressure chamber 2 The supply of fluid pressure to 3 is cut off.

To release the parking operation, the shift lever 6 is moved in the R direction. When the shift lever 6 is slightly moved in the R direction, the taper shaft 13 separates from the taper hole 15 of the valve body 14 and a gap is formed between the taper shaft portion 13 and the taper hole 15. The fluid pressure in the fluid pressure tank 17 communicates between the outlet ports 19 and flows from the inlet port 18 to the outlet port 19.

The fluid pressure discharged from the discharge port 19 is supplied to the pressure chamber 23 through the fluid pressure supply passage 21 and presses the piston 11 to the right in the figure, and this pressing force assists the operating shaft 5, The operation force to release parking is reduced.

The cam 8 is separated from the parking pole 3 by the rightward movement of the operating shaft 5, and the parking pole 3 is pivoted downward by the return spring to disengage the parking gear 2. At this time, the valve body 14 closes the inlet port 18 and the outlet port 19 at its outer diameter surface, and the discharge port 22 closed by the piston 11 is opened, so that the fluid pressure supplied to the pressure chamber 23 is reduced. Is discharged.

A fluid pressure of a constant pressure is constantly supplied from the first pump 31 to the reaction chamber 30 at the tip of the operating shaft 5 when the engine is rotating, but when the vehicle is stopped, the second pump 36 is provided. Is not actuated, the plunger 34 is moved backward by the spring 35, and the ball valve 33 opens the discharge passage 32. Therefore, the fluid pressure supplied to the reaction force chamber 30 is released to the low pressure side and does not restrain the axial movement of the operating shaft 5 in the parking operation direction, so that the parking operation by the shift lever 6 can be smoothly performed. .

When the second pump 36 is operated by the traveling of the vehicle, the output pressure of the second pump 36 pushes the plunger 34 to move forward and push the ball valve 33 in the closing direction to close the discharge passage 32. As a result, a predetermined pressure is applied to the reaction force chamber 30, and the movement of the operating shaft 5 that has been released from parking is restricted in the parking operation direction. Therefore, it is possible to prevent the shift lever 6 from being accidentally moved to the parking range during traveling, and to prevent damage to the parking pole or the parking gear.

[0022]

[Effect of device]

 As described above, the present invention is provided with the cam for operating the parking pole in the direction of engaging the parking gear, and the fluid pressure cylinder is provided on the operating shaft which is moved forward and backward by the shift lever. A piston fixed to the working shaft, a fluid pressure supply passage for supplying fluid to the pressure chamber so as to press the piston when the parking is released and urge the working shaft in the parking release direction, and a shaft of the working shaft. It has a built-in valve element that closes the fluid supply passage during parking operation by movement and opens when parking is released, and supplies fluid pressure to the tip of the operating shaft to restrain axial movement of the operating shaft in the parking operation direction. Since the reaction force chamber is provided and the control valve that leaks the fluid pressure in the reaction force chamber to the low pressure side to reduce the pressure as the vehicle speed decreases, Since the valve body is opened by the operation of the operating shaft when releasing the parking and the operating shaft is assisted by the fluid pressure cylinder, the operating force for releasing the parking is reduced and the shift lever is accidentally moved to the parking range while traveling. This has the effect of preventing problems such as damage to the parking pole or parking gear.

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention.

[Explanation of symbols]

 1 Output Shaft 2 Parking Gear 3 Parking Pole 5 Operating Shaft 6 Shift Lever 8 Cam 9 Fluid Pressure Cylinder 11 Piston 13 Tapered Shaft 14 Valve Disc 15 Tapered Hole 17 Fluid Pressure Tank 18 Inlet Port 19 Outlet Port 20 Supply Port 21 Fluid Pressure Supply Passage 22 Discharge port 23 Pressure chamber 30 Reaction force chamber 31 First pump 32 Discharge passage 36 Second pump 37 Control valve

Claims (1)

[Scope of utility model registration request] Claims: 1. A parking gear mounted on an output shaft, a parking pole engaged with and disengaged from the parking gear, and a cam operating in a direction to engage the parking pole with the parking gear. In a vehicle parking device including an operating shaft, a fluid is supplied to a pressure chamber so that a piston is fixed to the operating shaft and the piston is pressed when the parking is released to urge the operating shaft in the parking releasing direction. A fluid pressure cylinder having a fluid pressure supply passage and a valve body that closes the fluid supply passage when parking is performed by axial movement of the operating shaft and opens when parking is released is provided on the operating shaft, and the tip of the operating shaft is provided. A reaction force chamber that supplies fluid pressure to the shaft to restrain the axial movement of the operating shaft in the parking operation direction is provided.
A vehicle parking device comprising a control valve for leaking the fluid pressure of the reaction force chamber to a low pressure side to reduce the pressure as the traveling speed of the vehicle decreases.