JP2751055B2 - Vehicle parking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle parking system, and more particularly to a vehicle parking system in which an output shaft, that is, an output shaft or a propeller shaft of a transmission is rotating, to prevent the parking pole from operating.
For a highly secure vehicle, the change lever cannot be set in the range (parking range), and only when the vehicle is stopped, the parking pole is engaged with the parking gear to set the change lever in the P range. The present invention relates to a parking device.

[0002]

2. Description of the Related Art Conventionally, in large vehicles such as buses and trucks employing an automatic transmission,
Due to the problem of strength, it is difficult to provide a parking range, which is a position where the change lever is set, that is, a so-called P range. Therefore, it is common that a conventional vehicle of this type does not have a parking range. When parking, the change lever was set to the neutral position and the parking brake was applied.

In recent years, materials having high strength have been developed, and a parking range has been provided for this kind of large-sized vehicle. However, the parking device for the vehicle has a parking gear fixed to an output shaft. The parking pawl is engaged to prevent rotation of the output shaft, and the parking pawl is operated by operating a cylindrical cam fitted to the operating shaft.

[0004] However, in the conventional vehicle parking device, since the operation of the operation shaft is manually performed via a push-pull cable or the like, there is a disadvantage that the operation force is heavy and the operability is poor.

In order to solve this drawback, there has been proposed a device in which the operating shaft is operated by a hydraulic device. However, although the operating force of the operating shaft is reduced, the operation is performed by checking the condition of the vehicle. It is a structure that can be activated at any time, not at all, so if the driver accidentally sets the change lever to the parking range while the vehicle is running, the output during rotation Since the parking pawl is forcibly engaged with the parking gear fixed to the shaft, the parking device may be broken.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages of the prior art, and an object of the present invention is to provide a piston formed integrally with an operating shaft.
A ston is accommodated and the front and rear chambers on both sides of the piston are connected.
Chi a fluid pressure cylinder communicating hole is formed in the piston to pass, the pressure of the pressure fluid supplied to the fluid pressure cylinder
Open / close the piston communication hole by operating the end lever
By providing a fluid pressure control device for controlling the operating shaft, the operating force of the operating shaft is reduced to improve the driving performance and enable a comfortable driving. Another object is to provide a rotation sensor for detecting the presence or absence of rotation of the output shaft and a change lever in response to a rotation detection signal from the rotation sensor .
The blocking member protrudes on the operation path to
The operation to the P range is prevented and the fluid pressure control device
And a shift lock device for preventing the operation of closing the communication hole of the piston to prevent the operation of the parking pawl during running of the vehicle so that the change lever cannot be set to the P range. An object of the present invention is to prevent the parking device from being destroyed due to an erroneous operation.

[0007]

SUMMARY OF THE INVENTION In summary, the present invention relates to a parking gear fixed to an output shaft and a parking device rotatably disposed on a casing and engaged with the parking gear to prevent rotation of the output shaft. A parking device for a vehicle, comprising: a pawl; and a cylindrical cam that is slidably fitted to an operating shaft and rotates the parking pawl in a direction to engage the parking gear by an elastic member. communication for communicating the front chamber and a rear chamber integral with the operating shaft to be formed Rutotomoni sides to actuate in a direction to release the engagement between the parking gear and the parking pawl
A holed piston and the casing integrated
The rear chamber is formed so that the piston is slidably housed therein.
Before communicating with the supply passage of the compressed fluid communicating with the front chamber and the front chamber
A fluid pressure cylinder in which the pressure fluid discharge passage is formed, and a limited area on the rear chamber side of the piston.
The piston is slidably fitted to the operating shaft at the front end.
After the seal ring that opens and closes the communication hole is attached
Push-pull cable connected to a change lever at the end
To which the clevis to which the clevis is fixed and the clevis
The clevis and the operating shaft
The push-pull cable is moved by operating a change lever, and the pressure of the pressure fluid supplied to the fluid pressure cylinder is constituted by a compression spring that presses and urges the pressure spring so as to be interposed therebetween.
The sleeve is connected to the operating shaft via the clevis.
A fluid pressure control device that controls the pressure of the pressure fluid acting on the piston by opening and closing the communication hole of the piston by sliding the piston, and transmitting a signal by detecting the presence or absence of rotation of the output shaft. A rotation sensor and the output shaft rotate
When not in response to a signal from the rotation sensor
The change lever can be operated to the parking range.
To pull the push-pull cable to move the operating shaft
And the cylindrical cam is engaged with the parking pole.
In response to a signal from the rotation sensor when the output shaft is rotating, a blocking member is protruded on an operating shaft trajectory of the change lever to cause the parking range of the change lever to rotate. Prevent operation of the push-pull cable and the front
The movement of the sleeve is prevented by preventing the movement of the sleeve.
And prevent the cylindrical cam from moving to the parking pole.
By preventing engagement to prevent operation of the par parking brake
And a shift lock device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 to 3, a vehicle parking device 1 according to the present invention includes a parking gear 2, a parking pawl 3, a cylindrical cam 4, a fluid pressure cylinder 5, a fluid pressure control device 6, a rotation sensor 8 And a shift lock device 9.

The parking gear 2 is for preventing the vehicle from running, and has a plurality of gear-shaped teeth 2a formed on the outer periphery thereof.
And rotates with the output shaft 11.

The parking pole 3 is a parking gear 2
One end 3a is rotatably fitted to a support shaft 13 fixed to a casing 12, and the other end is a cylindrical cam 4a. A cam portion 3b is formed so as to swing the parking pole 3 about the support shaft 13 in contact with the cam shaft 3b.
A claw 3c is formed at a substantially central portion of the parking gear 2 so as to mesh with the tooth shape 2a of the parking gear 2. Support shaft 13
, A torsion coil spring 14 is mounted and constantly biases the parking pawl 3 in a direction to separate it from the parking gear 2.

The cylindrical cam 4 is for operating the parking pawl 3 in a direction of approaching the parking gear 2 against the urging force of the coil spring 14, and cooperates with the cam portion 3b of the parking pawl 3 for parking. A cam surface 4a for rotating the pawl 3 in a direction to approach the parking gear 2 is formed, slidably fitted to an operating shaft 15 slidably disposed on the casing 12, and is compressed by a compression spring 16 in the figure. It is always biased rightward. A stopper 18 is fixed to the operation shaft 15 so as to prevent the cylindrical cam 4 pressed by the compression spring 16 rightward in the figure from moving further.

The hydraulic cylinder 5 drives the operating shaft 15 by the pressure of the compressed fluid, and includes a cylinder 12a provided on the casing 12 and a piston 15a formed integrally on the operating shaft 15. The piston 15a is slidably fitted into the cylinder 12a while the leakage of the compressed fluid is prevented by the O-ring 19. The casing 12 also has a supply passage 12c for compressed fluid that communicates with the rear chamber 12b of the cylinder 12a defined by the piston 15a, and a discharge passage 12e for compressed fluid that communicates with the front chamber 12d and a reserve tank (not shown). Are provided. The piston 15a is further provided with a communication hole 15b for communicating the rear chamber 12b and the front chamber 12d of the cylinder 12a.

The fluid pressure control device 6 is for controlling the pressure of the compressed fluid supplied to the fluid pressure cylinder 5, and a sleeve 20 is provided on the working shaft 15 on the rear chamber 12b side of the cylinder 12a in the axial direction. The sleeve 20 has a front end 20a slidably inserted thereinto, and a communication hole 15b for a piston 15a.
Is mounted. An elongated hole 15c is formed at an end of the operating shaft 15 in the axial direction, and a pin 22 is inserted through the elongated hole 15c to connect a clevis 23. The clevis 23 and the shaft end 15d of the operating shaft 15 are connected. A compression spring 27 is mounted between the two and presses and urges the clevis 23 and the operating shaft 15 so as to always separate them. Clevis 23 is push-pull cable 2
6 is connected to a change lever 25 of the automatic transmission 24 so that the operation shaft 15 can be operated by the change lever 25.

The rotation sensor 8 is for detecting the presence or absence of rotation of the output shaft 11 and is, for example, a magnetic detection device disposed in close proximity to the output shaft 11. When this is detected, this is detected and a signal is sent to the shift lock device 9 via the electric cable 28.

The shift lock device 9 includes the change lever 2
5 to prevent the operation of the rotation sensor 8
And a computer 30 for receiving a signal from the controller 30 and processing the signal in accordance with a predetermined procedure and transmitting a command signal via an electric cable 29. When activated, a blocking member (not shown) protrudes on the operation path of the change lever 25. And a blocking mechanism (not shown) including an electromagnetic solenoid configured to prevent the operation of the change lever 25 to the P range .

The present invention is configured as described above,
The operation will be described below with reference to FIGS. In the parking state in which the change lever 25 shown in FIG.
Since the operating shaft 15 is moved rightward in the figure by the push-pull cable 26 connected to the cylinder 5, the cylindrical cam 4 is pressed and urged rightward in the figure by the compression spring 16, and , The cam surface 4a comes into contact with the cam portion 3b of the parking pawl 3 to rotate the parking pawl 3 clockwise against the force of the torsion coil spring 14,
The pawl 3c is engaged with the tooth profile 2a of the parking gear 2 to prevent the output shaft 11 from rotating, thereby performing a parking action.

At this time, the piston 15a is moved rightward in the figure via the push-pull cable 26, the clevis 23, and the pin 22 inserted into the elongated hole 15c, and moves to the retreating end of the cylinder 12a. 20 also seal ring 21 located at the rear end is spaced from the piston 15a, which is opened the communication hole 15b. Accordingly, the compressed fluid supplied from the compressed fluid supply passage 12c to the rear chamber 12b passes through the communication hole 15b, enters the front chamber 12d, and is further discharged from the discharge passage 12e to the reserve tank. Therefore, the force of the compressed fluid does not act on the piston 15a,
The parking state is maintained.

When the parking is released from the parking state, referring to FIGS. 4 and 5, when the change lever 25 is moved to the parking releasing position, the push-pull cable 26 moves the clevis 23 forward in the direction of arrow A. However, since the clevis 23 moves the sleeve 20 relative to the operating shaft 15 while compressing the compression spring 27 by the stroke in which the pin 22 moves in the elongated hole 15c, the seal ring 21 comes into contact with the piston 15a, Communication hole 15b
To close. As a result, the supply passage 12c moves from the rear chamber 12
b (in the direction of arrow B), the discharge of the compressed fluid is shut off, so that the pressure in the rear chamber 12b rises and the piston 15
a is moved in the direction of arrow C. At this time, the compressed fluid in the front chamber 12d is discharged from the discharge passage 12e to the reserve tank in the direction of arrow D.

Since the operating shaft 15 formed integrally with the piston 15a moves in the direction of arrow C, the stopper 18 moves the cylindrical cam 4 in the direction of arrow C while compressing the compression spring 16. By this movement, the cylindrical cam 4 is disengaged from the parking pawl 3, and the parking pawl 3 is rotated in the direction of arrow E by the action of the torsion coil spring 14, and the pawl 3c
Is disengaged from the tooth profile 2a of the parking gear 2 to release the engagement, and the parking is released.

During traveling of the vehicle, as shown in FIG. 6, the compressed spring 27 is expanded to move the clevis 23 rightward in the figure by the stroke of the pin 22 floating in the elongated hole 15c. Therefore, the sleeve 20 also moves along with this, and the seal ring 21
And the communication hole 15b is opened. Accordingly, the compressed fluid supplied from the supply passage 12c to the rear chamber 12b passes through the communication hole 15b, enters the front chamber 12d, and is further discharged from the discharge passage 12e to the reserve tank, and the piston 15a
Is not acted upon by the compressed fluid, the parking pawl 3 remains separated from the parking gear 2,
The parking release state is maintained, and the vehicle can run.

Next, referring to FIG. 7, to change the parking state from the parking release state to the parking state, the change lever 25 is used.
Is set to the P range, the clevis 23 is pulled in the direction of arrow F by the push-pull cable 26 connected to the change lever 25, and the pulling force is transmitted to the operating shaft 15 via the pin 22 to move the operating shaft 15 Move in the direction of arrow F. As a result, the cylindrical cam 4 is compressed by the compression spring 16.
As a result, the cam surface 4a slides on the operating shaft 15 so that the cam surface 4a comes into contact with the cam portion 3b of the parking pawl 3 to twist the parking pawl 3 against the force of the coil spring 14. In the direction (arrow G direction)
Is meshed with the tooth profile 2a of the parking gear 2, and the output shaft 11
The rotation of the vehicle is stopped and the parking state is set.

At this time, the piston 15a is moved rightward in the figure via the push-pull cable 26, the clevis 23, and the pin 22 inserted through the elongated hole 15c, and moves to the retreating end of the cylinder 12a. Since the sleeve 20 is also located at the retracted end, the seal ring 21 is separated from the piston 15a and opens the communication hole 15b. As a result, the compressed fluid supplied from the supply passage 12c to the rear chamber 12b passes through the communication hole 15b and enters the front chamber 12d, and is further discharged from the discharge passage 12e to the reserve tank. No operation is performed, and the parking state is maintained.

The parking device 1 operates as described above to switch between the parking state and the parking release state. Next, the operation of the shift lock device 9 which is a main part of the present invention will be described with reference to FIG. 1. When the vehicle is running and the output shaft 11 is rotating, the rotation sensor 8 detects the output shaft 11. And transmits a rotation detection signal to the computer 30. After receiving the signal and performing arithmetic processing according to a predetermined procedure, the computer 30 sends out an electromagnetic solenoid operation command signal via the electric cable 29 to operate an electromagnetic solenoid (not shown) to operate the change lever prevention mechanism. The blocking member is projected on the operation locus of the change lever 25 to lock the change lever, disabling the operation of the parking device 1 during running of the vehicle, and only when the vehicle is stopped and the output shaft 11 is not rotating, The parking device 1 can be operated to prevent the parking device from being damaged.

[0024]

The present invention is, as described above, integrated with the operating shaft .
Formed on the front side of the piston
A communication hole communicating the chamber and the rear chamber is formed in the piston.
A fluid pressure cylinder has, communicating the piston by operating the change lever of pressure in the pressure fluid supplied to the fluid pressure cylinder
Since the fluid pressure control device that controls the opening and closing of the through hole is provided, there is an effect that the operating force of the operating shaft is reduced, the driving performance is improved, and comfortable driving can be performed. A rotation sensor for detecting the presence or absence of rotation of the output shaft and a change in response to a rotation detection signal from the rotation sensor.
The blocking member protrudes on the operating path of the lever and the change
Prevents operation of lever to P range and controls fluid pressure
A shift lock device for preventing the piston from closing the communication hole by the device is provided, so that during operation of the vehicle, the operation of the parking pole can be prevented and the change lever cannot be set to the P range. As a result, there is an effect that the destruction of the parking device due to an erroneous operation can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part including a partial perspective view of a parking device mounted on a part of a transmission.

FIG. 2 is an overall vertical sectional view of the parking device.

FIG. 3 is a vertical sectional view of a main part showing a parking state of the parking device.

FIG. 4 is a vertical sectional view of a main part showing an initial state of a parking release operation of the parking device.

FIG. 5 is a longitudinal sectional view of a main part showing a state in a latter half of a parking release operation of the parking device.

FIG. 6 is a longitudinal sectional view of a main part showing a state of a parking release state of the parking device.

FIG. 7 is a longitudinal sectional view of a main part showing a state of the parking device operating to a parking state.

[Explanation of symbols]

Reference Signs List 1 vehicle parking device 2 parking gear 3 parking pole 4 cylindrical cam 5 fluid pressure cylinder 6 fluid pressure control device 8 rotation sensor 9 shift lock device 11 output shaft 12 casing 12b rear chamber 12c supply passage 12d front chamber 12e discharge passage 15 operation Shaft 15a Piston 15b Communication hole 16 Elastic member 20 Sleeve 21 Seal ring 23 Clevis 25 Change lever 27 Compression spring

Claims (1)

(57) [Claims] A parking gear fixed to an output shaft;
A parking pole rotatably disposed on a casing and engaged with the parking gear to prevent rotation of the output shaft; and a parking pole slidably fitted on an operation shaft and being connected to the parking gear by an elastic member. in vehicle parking apparatus having a cylindrical cam to rotate in a direction to engage, to actuate the actuation shaft in a direction to release the engagement between the parking pole and the parking gear
The operating shaft integrally formed with Rutotomoni both sides of the front chamber and after
A piston formed with a communication hole for communicating the chambers;
The piston is slidable integrally with the casing
And a supply passage for the compressed fluid that is accommodated in the rear chamber and communicates with the rear chamber.
A fluid pressure cylinder and the discharge passage of the pressure fluid communicating serial into the front chamber is made forms, the rear chamber side smell of the piston
Before being slidably fitted to the operating shaft within a limited range
A seal ring at the end for opening and closing the communication hole of the piston
Attached to the rear end of the push lever connected to the change lever.
The clevis to which the sprue cable is connected is
Leave and the clevis housed inside the clevis and the clevis
A compression spring that presses and biases the operating shaft so that it is always separated
It said push pulque by operating the change lever the pressure of the pressure fluid supplied to the fluid pressure cylinder consists of a
Move the cable to remove the sleeve via the clevis.
The pressure acting on the piston by opening and closing the communication hole of the piston by sliding with respect to the operating shaft
A fluid pressure control device for controlling the pressure of the fluid, the rotation sensor sends a signal to detect the presence or absence of rotation of the output shaft, before
When the output shaft is not rotating, the signal from the rotation sensor
To the parking range of the change lever in response to
Of the push-pull cable
The operating shaft is retracted to move the cylindrical cam into the parkin.
Activates the parking brake by engaging the GPOR
Wherein the response to a signal from the rotation sensor is protruded a blocking member on the actuating shaft trajectory of the change lever to prevent operation to the parking range of the shift lever when the allowed and that the output shaft is rotating With the push
The movement of the cable and the sleeve.
To prevent the operating shaft from retreating,
The parking brake is prevented from engaging with the king pole.
A vehicle parking device comprising: a shift lock device for preventing operation of a key .