JP2009063006A - Parking control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parking control device which is improved in responsiveness without causing the lowering of oil pressure for releasing parking. <P>SOLUTION: In an initial stage for releasing the parking, a large force can be taken out of an output rod 33 fixed to a small-diameter piston 32 since pressure-receiving areas of a large-diameter piston 31 and the small-diameter piston 32 are large, a parking rod cam 15 is driven in this state by a distance equivalent to a moving distance of a parking rod 14 which elastically contacts with a support 17 and a parking pole 18, then the large-diameter piston 31 is stopped, only the small-diameter piston 32 is moved, and thereby the responsiveness for the introduction of oil pressure from an oil-pressure introduction port 36 is improved. In this state, the movement of the small-diameter piston 32 can be linked to the movement of the parking rod 14. Accordingly, since the oil pressure fed to a releasing cylinder 30 is reduced in amount as a whole, the lowering of the oil pressure for releasing the parking is not caused, and thus the favorable responsiveness can be obtained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hydraulic control device for an automatic transmission for a vehicle, and more particularly to a parking control device for controlling the operation of a parking mechanism.

As for the parking mechanism provided in the conventional automatic transmission, the manual type which operates a driver | operator's operation via a mechanical linkage is mainstream.
Patent Document 1 discloses a parking piston mechanism that operates a piston coupled to a parking mechanism with hydraulic pressure, an electronic control device that includes a shift position switch that is selected and operated by a driver, and a signal from the shift position switch. And is configured to supply and discharge hydraulic pressure to the parking piston mechanism in accordance with the operation of the solenoid valve, and replaces the conventional mechanical linkage with an electric cable or the like that can be easily connected. There has been proposed a parking control device that enables the use of a connecting means and releases the parking mechanism by hydraulic pressure.

Further, in Patent Document 2, based on an operation signal input to the electronic control device, the lock claw engages with or disengages the parking gear on the shaft of the automatic transmission, whereby the automatic transmission is The lock claw is slid by the pressure reservoir and engaged with the parking gear at that time, and the engagement is released by compressing the pressure reservoir via hydraulic pressure, and the lock claw is engaged. There has been proposed a purging control device having a parking lock mechanism that is fixed in a released state.
JP 2006-351698 A German Patent Publication No. 1934156A1

However, if the technique of Patent Document 1 and Patent Document 2 is used and a method is used in which a hydraulic operation is performed by supplying a hydraulic pressure when releasing parking, and by a manual operation when entering parking, the parking can be released. It is necessary to use a cylinder with a large output.
FIG. 8 is an explanatory view showing a main part mechanism of the parking control device in the parking state.
In FIG. 8, an automatic transmission (not shown) is built in the transmission case 10, and parking and release thereof are performed by rotating the shaft 11. The shaft 11 is pivotally connected to a detent lever 12 whose elastic force is always urged by a parking spring 13. A parking rod 14 is pivotally supported on the upper free end side of the detent lever 12, and the parking rod 14 is guided out of the transmission case 10 and connected to a select lever (not shown) operated by a driver. The parking rod 14 is provided with a parking rod cam 15, and an elastic force is applied to the outside of the transmission case 10 by a rod spring 16. In the oil pan 19, lubricating oil (not shown) for cooling and lubricating components of the automatic transmission is accommodated.

In the parking position, the parking rod cam 15 enters between the support 17 and the parking pole 18 and is elastically contacted there to prevent the parking rod cam 15 from coming off, so that a stable parking state is maintained. In order to cancel the parking state, it is necessary to slide the parking rod cam 15 elastically contacted between the support 17 and the parking pole 18 against the elastic force.
When the parking rod 14 is controlled by hydraulic pressure, the parking rod cam 15 is sandwiched between the support 17 and the parking pole 18, and thus the diameter of the hydraulic cylinder has to be increased. However, when the diameter of the hydraulic cylinder is increased, if the supply hydraulic pressure is determined, the responsiveness decreases. Further, if the diameter of the hydraulic path is increased in order to improve the responsiveness, the hydraulic pressure may be instantaneously reduced.

  Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide a parking control device with good responsiveness without causing a decrease in parking release hydraulic pressure.

In the parking control device according to claim 1, when the release cylinder for releasing the parking state receives the supply hydraulic pressure, the large-diameter piston and the small-diameter piston move together, and then stops the large-diameter piston, The movement of only the small-diameter piston is performed, the movement of the small-diameter piston is the movement of the parking rod, and the automatic transmission is linked to the shaft that sets the parking state.
Here, the small-diameter piston accommodated in the large-diameter piston accommodated in the release cylinder is only to install the large-diameter piston and the small-diameter piston on a concentric axis when the present invention is implemented. It does not mean that the large diameter piston and the small diameter piston may move in the same axial direction.
In addition, the initial movement of the large-diameter piston and the small-diameter piston that has received the supply hydraulic pressure is performed by pressing the large-diameter piston and the small-diameter piston and moving the large-diameter piston at a predetermined position. Although it stops, when implementing this invention, the engagement relationship of the said large diameter piston and the said small diameter piston should just be cancelled | released in a specific position.
And what connects the movement of the said small diameter piston to the movement of a parking rod should just be what can operate rotation of the rod of the parking mechanism of an automatic transmission, when carrying out the present invention. It may be connected directly or via a detent lever.

In the parking control device according to claim 2, the large-diameter piston is stopped by an annular stopper that collides with an end of the large-diameter piston.
Here, the annular stopper with which the end of the large-diameter piston collides can be formed separately from the release cylinder, or formed integrally with an annular stopper formed inside the release cylinder. That is, when the present invention is carried out, it can be manufactured by either cutting or fitting.

In the parking control device according to a third aspect, the initial stage of receiving the supplied hydraulic pressure is set to a movement distance corresponding to a distance that the parking rod cam moves elastically between the support and the parking pole.
Here, since the parking rod cam is elastically contacted between the support and the parking pole, a relatively large force is required for the moving distance of the parking rod. After that distance, the necessary force is reduced, so that the response is improved by moving only the small-diameter piston, so the parking rod cam is elastically contacted between the support and the parking pole. If the moving distance of the parking rod is exceeded, it is desirable to efficiently move only the small diameter piston as early as possible.

  The parking control device according to claim 4 further includes holding means for restricting movement of the parking rod so as to hold the parking release state of the parking rod, and the holding means is configured to restrain the parking rod. The detent lever can be restrained and the small-diameter piston can be restrained. Further, the restraint at this time may be magnetically attracted or repelled by a solenoid, or may be mechanically locked.

The holding means of the parking control apparatus according to claim 5 is a magnetic action by an electromagnetic solenoid disposed in the axial direction of the small-diameter piston.
Here, in particular, the position of the small-diameter piston is stopped at a specific position by performing suction or repulsion by the electromagnetic solenoid at the end of the small-diameter piston in the axial direction. .

  The holding means of the parking control device according to a sixth aspect is an actuator that drives a plunger that engages with or releases the output rod of the small-diameter piston. Here, the actuator can be an electromagnetic solenoid, or a driving source such as a motor can be used. In any case, any actuator can be used as the actuator.

The large-diameter piston and the small-diameter piston of the parking control device according to claim 7 receive the hydraulic pressure in the release cylinder and receive the hydraulic pressure in the release cylinder when the large-diameter piston is attached to the output rod. When the small-diameter piston is pressed in a contact state, and then the large-diameter piston comes into contact with a stopper disposed in the release cylinder and stops, only the small-diameter piston moves in the release cylinder. It is.
Here, the large-diameter piston and the small-diameter piston receive the hydraulic pressure, the large-diameter piston presses the small-diameter piston in a contact state, and then the large-diameter piston is disposed in the release cylinder. As long as it comes into contact with the stopper and stops, only the small-diameter piston may move the output rod.

In the parking control device according to claim 1, when releasing the parking, the release cylinder receives supply hydraulic pressure, and the large-diameter piston and the small-diameter piston accommodated slidably in the axial direction of the release cylinder are integrated. Move at the same time. At this time, since the pressure receiving surfaces of the large diameter piston and the small diameter piston are wide, a large force can be extracted from the small diameter piston. Therefore, the movement of the large-diameter piston is transmitted to the small-diameter piston by a distance corresponding to the movement distance of the parking rod in which the parking rod cam is in elastic contact between the support and the parking pole, and the large-diameter piston and the small-diameter piston are transmitted. If they move together as a unit, the movement of the small-diameter piston can be linked to the movement of the parking rod with a large output from the small-diameter piston. Next, by stopping the large-diameter piston and moving only the small-diameter piston, the movement of the small-diameter piston can be linked to the movement of the parking rod in a state where the responsiveness is enhanced.
Therefore, the parking control device of the present invention can improve the responsiveness without causing a decrease in the parking release hydraulic pressure when releasing the parking.

  In the parking control device according to claim 2, the large diameter piston is stopped by an annular stopper that collides with an end of the large diameter piston. The collision position of the radial piston is stable and does not move with its use. Further, since the large-diameter piston accommodated in the release cylinder and the annular stopper are caused to collide, a highly reliable operation can be expected due to a predetermined hydraulic pressure abnormality.

  In the parking control device according to claim 3, the initial stage of receiving the supplied hydraulic pressure is set as a period corresponding to a moving distance of the parking rod in which the parking rod cam is elastically contacted between the support and the parking pole. Therefore, in addition to the effect of the first or second aspect, the responsiveness can be improved most efficiently without causing a decrease in the parking release hydraulic pressure.

  The parking control device according to claim 4 is provided with holding means for restraining the movement of the parking rod so as to hold the parking release state of the parking rod, so that any one of claims 1 to 3 is provided. In addition to the effects described above, the parking release state can be maintained even if the supply hydraulic pressure to the release cylinder is cut off.

  Since the holding means of the parking control device according to claim 5 is a magnetic action by an electromagnetic solenoid disposed in the axial direction of the small-diameter piston, in addition to the effect of the fourth aspect, Since the position of the small-diameter piston can be stopped at a specific position by the electromagnetic solenoid at the end in the axial direction, the position of the small-diameter piston can be maintained without being influenced by hydraulic control, and the location of the small-diameter piston can be arbitrarily determined depending on the capability of the electromagnetic solenoid Can be set.

  Since the holding means of the parking control device according to claim 6 is an actuator that drives a plunger that engages with or releases the output rod of the small-diameter piston, the effect according to claim 4 is achieved. In addition, the position of the small-diameter piston can be stopped at a specific position by the actuator, the position of the small-diameter piston can be maintained without being influenced by the control of the hydraulic pressure, and the arrangement location can be arbitrarily set by the capability of the electromagnetic solenoid. As an actuator, any driving source can be used. The engagement or release of the small diameter piston with the output rod is a highly reliable operation because the movement of the output rod is stable.

The large-diameter piston and the small-diameter piston of the parking control device according to claim 7 receive the hydraulic pressure in the release cylinder and receive the hydraulic pressure in the release cylinder when the large-diameter piston is attached to the output rod. The small-diameter piston is pressed in a contact state, and then, when the large-diameter piston comes into contact with a stopper disposed in the release cylinder and stops, only the small-diameter piston moves in the release cylinder. It is.
Accordingly, in addition to the effect described in any one of claims 1 to 6, the large-diameter piston and the small-diameter piston have a simple structure, and a decrease in parking release hydraulic pressure and a response when parking is released. Can be set arbitrarily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, the same reference numerals and the same reference numerals as those in the first embodiment are the same or corresponding functional parts in the figure, and therefore, redundant description is omitted here.
[Embodiment 1]

  FIG. 1 is a cross-sectional view of a main part showing a parking state of the parking control apparatus according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of main parts showing a parking release state of the parking control apparatus according to the first embodiment of the present invention.

  In FIG. 1 and FIG. 2, an automatic transmission (not shown) is built in the transmission case 10, and parking and release thereof are performed by rotating the shaft 11. The shaft 11 is pivotally connected to a detent lever 12 whose elastic force is always applied to the parking spring 13 in the clockwise direction in FIG. A parking rod 14 is fixed to the upper arm 12a of the detent lever 12, and the parking rod 14 is guided out of the transmission case 10 and connected to a select lever (not shown) operated by a driver. The parking rod 14 is provided with a parking rod cam 15, and the parking rod cam 15 is given an elastic force to the outside of the transmission case 10 along the parking rod 14 by a pin spring 16 that is pinned. Yes.

  An oil pan 20 is disposed in the lower opening of the transmission case 10. A control valve body (not shown) of the transmission case 10 receives a supply hydraulic pressure from the hydraulic mechanism via the supply valve 21a and releases the supply hydraulic pressure via the discharge valve 21b when releasing the parking. 30 is disposed. The release cylinder 30 may be incorporated in the control valve body or may be formed separately. This embodiment will be described with an example formed independently.

  A large-diameter piston 31 having a substantially annular column shape is slidably accommodated in the release cylinder 30, and a small-diameter piston 32 is slidably disposed inside the large-diameter piston 31. An output rod 33 is formed integrally with the small diameter piston 32. That is, the movement of the small diameter piston 32 is equal to the movement distance of the output rod 33. Introducing portions 31 a are formed at various locations on the hydraulic pressure inlet 36 side of the release cylinder 30 of the substantially circular columnar large-diameter piston 31 so that the hydraulic pressure can be introduced into the end of the small-diameter piston 32. The introduction portion 31a is formed shorter than the other end portions so that the hydraulic pressure can be introduced into the end portion of the small diameter piston 32 without being influenced by the position of the large diameter piston 31.

  An annular stopper 34 is disposed inside the release cylinder 30. When the large-diameter piston 31 moves a predetermined distance, the annular stopper 34 collides the end of the large-diameter piston 31 and stops the movement. Therefore, the outer diameter is the same as the outer diameter of the large-diameter piston 31, but the inner diameter is larger than the outer diameter of the small-diameter piston 32. That is, the large-diameter piston 31 is stopped when the end of the large-diameter piston 31 accommodated in the release cylinder 30 collides with the annular stopper 34 accommodated in the release cylinder 30. is there. Here, the annular stopper 34 with which the end of the large-diameter piston 31 collides is described as a separate body from the release cylinder 30, but the annular stopper 34 is formed inside the release cylinder 30 so as to be integrated. Can also be formed. That is, it may be machined or fitted.

In particular, the small-diameter piston 32 of the present embodiment includes a large-diameter portion 32a and a small-diameter portion 32b. The small-diameter portion 32b slides inside the large-diameter piston 31, and the large-diameter portion 32a slides inside the small-diameter portion 32b. The end of the large diameter portion 32a on the small diameter portion 32b side comes into contact with the annular stopper 34 side of the large diameter piston 31. Therefore, the movement of the large-diameter piston 31 contacts the end of the large-diameter portion 32 a of the small-diameter piston 32, and the large-diameter piston 31 moves the small-diameter piston 32 until the end of the large-diameter piston 31 contacts the annular stopper 34. It has a structure to press. Of course, when the small-diameter piston 32 returns, the large-diameter portion 32a of the small-diameter piston 32 presses the end of the large-diameter piston 31.
A piston stopper 35 is disposed on the opposite side of the release rod 30 from the output rod 33 to stop the movement of the small diameter piston 32.

  The lower arm 12 b of the detent lever 12 of the present embodiment is engaged with the pin 38 of the output rod 33. That is, when the hydraulic pressure is introduced into the release cylinder 30 via the supply valve 21a, the pin 38 rotates the lower arm 12b in the counterclockwise direction in the drawing. At this time, it rotates against the elasticity of the parking spring 13. Further, when the hydraulic pressure of the release cylinder 30 is eliminated by the discharge valve 21b, the pin 38 of the output rod 33 rotates the lower arm 12b in the right rotation direction in the drawing by the elasticity of the parking spring 13. Therefore, the pin 38 of the output rod 33 is always in contact with the lower arm 12b. When the present invention is carried out, the output rod 33 and the lower arm 12b can be coupled as a long hole in the radial direction of the lower arm 12b because the lower arm 12b rotates.

  Here, the distance between the upper arm 12a and the lower arm 12b of the detent lever 12 from the center of the shaft 11 to the support point of each other, that is, the distance L1 and the distance L2, is determined by the parking rod cam 15 by the support 17. In addition, it is possible to reduce the output power held between the parking pole 18 and the parking pole 18 to L1 / L2. Of course, it can be set to 1/1 or can be increased.

The parking control device of the present embodiment configured as described above can be operated as follows.
When the driver operates the select lever (not shown) to guide it to the parking position, the parking rod cam 15 disposed on the parking rod 14 enters between the support 17 and the parking pole 18 and is elastically contacted there. And keeps a stable parking condition.

At this time, the upper arm 12a and the lower arm 12b of the detent lever 12 are at the limit position rotated to the right as shown in FIG.
The left side of the lower arm 12b is in contact with the pin 38 of the output rod 33, and the large-diameter piston 31 and the small-diameter piston 32 in the release cylinder 30 are at the rightmost end position shown in the drawing. In this state, the supply valve 21a is stopped, and the hydraulic pressure in the release cylinder 30 is removed by the discharge valve 21b.

  To release the parking state, hydraulic pressure is supplied to the release cylinder 30 from the supply valve 21a. The hydraulic pressure is guided from the hydraulic inlet 36 of the release cylinder 30 to the end surface of the small diameter piston 32 and the large diameter piston 31 on the output rod 33 side, and the end of the large diameter piston 31 opposite to the output rod 33 is the small diameter piston 32. Since the large diameter portion 32a is in contact with the end portion of the large diameter portion 32a, the small diameter piston 32 and the large diameter piston 31 are simultaneously pressed rightward in the drawing. At this time, since the hydraulic pressure receiving surface becomes the small diameter piston 32 and the large diameter piston 31, a large force is generated in the output rod 33.

The movement of the output rod 33 rotates the lower arm 12b of the detent lever 12 in the left direction in the drawing. The detent lever 12 moves linearly against the elastic force of the parking spring 13 and receives the contact pressure of the parking rod cam 15 that is elastically contacted between the support 17 and the parking pole 18. .
At this time, at the position where the contact pressure of the parking rod cam 15 elastically contacted between the support 17 and the parking pole 18 is released, the position where the large-diameter piston 31 contacts the annular stopper 34 or the support 17 and the parking pole Suppose that the large-diameter piston 31 is brought into contact with the annular stopper 34 at a position immediately after the contact pressure of the parking rod cam 15 that is in elastic contact with the cylinder 18 is released. The amount of oil to be reduced can be minimized, and the parking rod 14 can be moved with a large force.

When the large-diameter piston 31 comes into contact with the annular stopper 34 at the position where the contact pressure of the parking rod cam 15 elastically contacted between the support 17 and the parking pole 18 is released, the large-diameter piston 31 is then fixed. It becomes. All the hydraulic pressure supplied to the release cylinder 30 is used to move the small-diameter piston 32. When the small-diameter piston 32 receives pressure on the surface on the output rod 33 side, its small-diameter portion 32b slides inside the large-diameter piston 31, and its large-diameter portion 32a slides inside the annular stopper 34, and the parking shown in FIG. The position of the release state.
At this time, if the same oil pressure is supplied, the pressure receiving end area of the large diameter piston 31 and the small diameter piston 32 is divided by the pressure receiving end area of the small diameter piston 32, and high speed control is possible.

  The parking control device of the first embodiment includes a release cylinder 30 that receives supply hydraulic pressure when releasing parking, a large-diameter piston 31 that is slidably accommodated in the axial direction of the release cylinder 30, and a large-diameter piston. A small-diameter piston 32 that is slidable in the axial direction, and initially receives the supplied hydraulic pressure, the large-diameter piston 31 and the small-diameter piston 32 move together. The piston 31 is stopped and only the small diameter piston 32 is moved, and the movement of the small diameter piston 32 is linked to the movement of the parking rod 14.

  Accordingly, since the pressure receiving surfaces of the large diameter piston 31 and the small diameter piston 32 are wide at the initial stage of releasing the parking, a large force can be taken out from the output rod 33 fixed to the small diameter piston 32. Therefore, if the large-diameter piston 31 and the small-diameter piston 32 move in this state by a distance corresponding to the moving distance of the parking rod 14 in which the parking rod cam 15 is elastically contacted between the support 17 and the parking pole 18, the small-diameter piston With the large output from 32, the movement of the small diameter piston 32 can be linked to the movement of the parking rod 14.

Next, by stopping the large-diameter piston 31 and moving only the small-diameter piston 32, the movement of the small-diameter piston 32 can be linked to the movement of the parking rod 14 with improved responsiveness. Accordingly, when releasing the parking, the amount of hydraulic pressure supplied to the releasing cylinder 30 is reduced, so that the parking releasing hydraulic pressure is not lowered and the responsiveness can be improved.
[Embodiment 2]

In the above embodiment, in order to maintain the parking release state, the hydraulic pressure must be continuously supplied to the release cylinder 30. However, once the parking state is released, the state can be maintained without continuously supplying the hydraulic pressure.
FIG. 3 is a cross-sectional view of a main part showing a parking release state of the parking control apparatus according to the second embodiment of the present invention.

  In the parking control apparatus according to the second embodiment of the present invention, a piston stop 35 is disposed on the opposite side of the output rod 33 of the release cylinder 30 as in the first embodiment. The piston stopper 35 is formed integrally with an iron core 43 disposed on the concentric shaft of the insulating bobbin 42 of the electromagnetic solenoid 40 that functions as a holding means. The piston stopper 35 and the iron core 43 are formed by cutting one iron bar. The iron core 43 and the insulating bobbin 42 are formed by insert molding in which the insulating bobbin 42 is integrally formed with the iron core 43. A coil 44 is wound around the insulating bobbin 42. Although this electromagnetic solenoid 40 constitutes a magnetic solenoid, it may of course be constituted as an air-core solenoid.

As described above, when the parking release state is maintained in the first embodiment by disposing the electromagnetic solenoid 40 functioning as the holding means on the piston stop 35 side, the supply valve 21a and the discharge valve 21b are stopped and released. It was necessary to maintain the hydraulic pressure in the cylinder 30 for use. However, in the present second embodiment, even if the hydraulic pressure is not continuously supplied to the release cylinder 30, the electromagnetic solenoid 40 functioning as the holding means is disposed on the piston stopper 35 side, so that the piston stopper 35 side is provided. The small diameter piston 32 can be sucked and held.
The holding means of this embodiment is a magnetic action by the electromagnetic solenoid 40 disposed in the axial direction of the small diameter piston 32. In particular, the position of the small-diameter piston 32 is stopped at a specific position by suction or repulsion by the electromagnetic solenoid 40 at the end of the small-diameter piston 32 in the axial direction. it can.
[Embodiment 3]

In the parking control apparatus according to the second embodiment of the present invention, the piston stopper 35 and the iron core 43 are excited by the electromagnetic solenoid 40, and the small-diameter piston 32 is sucked and held on the piston stopper 35 side. However, the part that performs electrical control and the part that performs hydraulic control can be configured separately.
FIG. 4 is a cross-sectional view of the main part showing the parking state above the center line of the output rod of the parking control apparatus according to the third embodiment of the present invention, and the parking release state below the center line.

  In the parking control device according to the third embodiment of the present invention, a sealing member 37 is disposed on the opposite side of the output rod 33 of the release cylinder 30, and the annular stopper 34, the large diameter piston 31, and the small diameter piston are arranged. 32 is prevented from leaving the release cylinder 30. A part of the sealing member 37 has a cylindrical shape, and is inserted into a fitting hole 32 d formed in the central axis direction of the large-diameter piston 31, so that the large-diameter piston 31 has a cylindrical shape. It can reciprocate along. The large-diameter piston 31 is provided with a ball hole 32e into which a steel ball 47 is inserted. The ball hole 32e of the large-diameter piston 31 and the insulating bobbin 42 of the electromagnetic solenoid 40 are reciprocally arranged on the concentric shaft. The large-diameter piston 31 is locked to the plunger 45 at the parking release position with the plunger 45 provided.

A diaphragm-like spring 46 is disposed between the sealing member 37 and the plunger 45 to prevent foreign matter from entering the electromagnetic solenoid 40. In addition, an auxiliary iron core 48 is disposed around the plunger 45 inside the insulating bobbin 42 around which the coil 44 is wound, and both of them can move integrally.
The plunger 45, the coil 44, and the like are accommodated in a housing 49 and integrated with the end of the release cylinder 30 by caulking.

Thus, when the parking release state is maintained by disposing the electromagnetic solenoid 40 functioning as the holding means on the opposite side of the output rod 33, the supply valve 21a and the discharge valve 21b are stopped and the release cylinder is stopped. The plunger between the ball hole 32e of the large-diameter piston 31 and the plunger 45 arranged to reciprocate on the concentric shaft of the insulating bobbin 42 of the electromagnetic solenoid 40 without holding the hydraulic pressure in the piston 30. By sucking 45, the plunger 45 is locked by the steel ball 47 at the parking release position of the large-diameter piston 31. Further, by releasing the suction of the plunger 45, the large-diameter piston 31 becomes the parking position, and each state can be maintained.
[Embodiment 4]

The parking control device according to the third embodiment of the present invention is configured by separately configuring a portion that performs electrical control and a portion that performs hydraulic control. The part can be a plunger.
FIG. 5: is principal part sectional drawing which shows a parking state above the centerline of the output rod of the parking control apparatus concerning Embodiment 4 of this invention, and a parking cancellation | release state below a centerline.

In the parking control apparatus according to the fourth embodiment of the present invention, a plunger 45A is integrally disposed on the opposite side of the output rod 33 of the release cylinder 30. Further, with the annular stopper 34, the large-diameter piston 31, and the small-diameter piston 32 not being detached from the release cylinder 30, the sealing member 37 is used and the opening end of the release cylinder 30 is inserted through the plunger 45A. A housing 49 is integrated with the end of the release cylinder 30 by caulking.
Inside the insulating bobbin 42 around which the coil 44 is wound, an auxiliary iron core 48A is disposed around the plunger 45A, and both of them can move integrally.
The plunger 45A, the auxiliary iron core 48A, the coil 44, and the like are housed in a housing 49 and integrated with the end of the release cylinder 30 by caulking.

Thus, when the parking release state is maintained by disposing the electromagnetic solenoid 40 functioning as the holding means on the opposite side of the output rod 33, the large-diameter piston 31, the small-diameter piston 32 and the electromagnetic solenoid 40 are insulated. By sucking the plunger 45A and the auxiliary iron core 48A between the plunger 45A and the plunger 45A which is reciprocally arranged on the concentric shaft of the bobbin 42, the large diameter piston 31 and the small diameter piston 32 are in the parking release position. The plunger 45A and the auxiliary iron core 48A hold positions, and the suction of the plunger 45A is released, whereby the large-diameter piston 31 and the small-diameter piston 32 become parking positions and can maintain the respective states.
[Embodiment 5]

6A and 6B are main part sectional views showing a parking state of the parking control apparatus according to the fifth embodiment of the present invention. FIG. 6A is a front view, FIG. 6B is a plan view below the fan gear, and FIG. FIG. 9 is a cross-sectional view of a main part showing a parking release state of a parking control device according to a fifth embodiment of the present invention, where (a) is a front view and (b) is a plan view below the fan gear.
In the first to fourth embodiments, the link from the output rod 33 to the parking rod 14 is configured via a link mechanism. However, the link may be other than the link mechanism, The form can also be changed.

  A rack gear 51 is formed on the output rod 33 on the opposite side of the release cylinder 30. The rack gear 51 is engaged with a pinion gear 52, and the reciprocation of the rack gear 51 is rotation of the pinion gear 52. In this embodiment, spur gears are used as the rack gear 51 and the pinion gear 52, but it is also possible to use bevel gears and bevel gears. The pinion gear 52 meshes with a fan gear 53 supported by a shaft, and the rotation of the fan gear 53 is the rotation of a drive gear 54 attached to the same shaft. The drive gear 54 meshes with a detent gear 55 formed at the end of the lower arm 12 b of the detent lever 12.

  The output rod 33 has a notch 33a. The notch 33a is engaged with a plunger 61 disposed on a concentric shaft of the insulating bobbin 62 of the actuator 60 functioning as a holding means. A coil 64 is wound around the insulating bobbin 62 of the actuator 60. The plunger 61 is urged by a coil spring 65, is not energized to the coil 64 in the parking state, and is not engaged with the notch 33a of the output rod 33 by the spring force. However, in the parking release state, when the coil 64 is energized, the tip of the plunger 61 is engaged with the notch 33a of the output rod 33, and the output rod 33 does not move arbitrarily.

  As in the present embodiment, the engagement of the pinion gear 52 and the fan gear 53 that meshes with the rack gear 51 of the output rod 33 and the engagement of the drive gear 54 and the detent gear 55 depend on the movement distance between the parking rod 14 and the output rod 33. When the movement distance of the parking rod 14 is smaller than the movement distance of the output rod 33, the amount of oil used in the release cylinder 30 increases, but the parking rod 14 can be driven with such a small force. it can.

That is, when the moving distance of the parking rod 14 does not coincide with the moving distance of the output rod 33, the initial stage when the release cylinder 30 receives the supply hydraulic pressure, that is, the parking rod cam 15 is between the support 17 and the parking pole 18. As long as it corresponds to the movement distance of the parking rod 14 that is in elastic contact,
Pressing movement distance of parking rod 14
X The stopping distance of the large-diameter piston 31 is calculated by the moving distance of the output rod 33 / the moving distance of the parking rod 14, and only the small-diameter piston 32 is moved thereafter.

  As a holding means for restraining the movement of the parking rod 14 in order to hold the parking release state of the parking rod 14 of the present embodiment, the notch 33a of the output rod 33 and the plunger 61 of the actuator 60 are engaged. Moreover, the plunger 61 is not always energized to the coil 64, and is not engaged with the notch 33a of the output rod 33 by the spring force, and the coil 64 is energized to maintain the parking release state. Only when the tip of the plunger 61 is engaged with the notch 33a of the output rod 33, it does not move.

If the coil spring 65 of this embodiment is a spring that performs a snap operation, the plunger 61 is reciprocated by the coil 64, and is held by a snap operation, energy loss can be reduced.
In the present embodiment, the actuator 60 that drives the plunger 61 that engages with or releases the output rod 33 of the small-diameter piston 32 is used. However, the actuator 60 may be an electromagnetic solenoid. In addition, a driving source such as a motor can also be used. In any case, the actuator 60 can be any drive source.

Further, as a holding means for restraining the movement of the parking rod 14 to hold the parking release state of the parking rod 14 of the present embodiment, the notch 33a of the output rod 33 and the plunger 61 of the actuator 60 are engaged. However, it may be held on the release cylinder 30 side as in the second embodiment.
In other words, the holding means for restraining the movement of the parking rod 14 so as to keep the parking rod 14 in the parking release state is connected to the parking rod 14 to the output rod 33, and means for locking or restraining the movement is arranged. Just set up.

  The parking control device of each of the above embodiments includes a release cylinder 30 that receives supply hydraulic pressure when releasing parking, a large-diameter piston 31 that is slidably accommodated in the axial direction of the release cylinder 30, and a large-diameter The piston 31 is provided with a small-diameter piston 32 that is slidable in the axial direction. When receiving the supply hydraulic pressure, the large-diameter piston 31 and the small-diameter piston 32 move simultaneously, and then the large-diameter piston 31. Is brought into contact with the annular stopper 34 and stopped to move only the small-diameter piston 32, and the movement of the output rod 33 of the small-diameter piston 32 is linked to the movement of the parking rod 14.

  Accordingly, since the pressure receiving surfaces of the large diameter piston 31 and the small diameter piston 32 are wide at the initial stage of releasing the parking, a large force can be taken out from the output rod 33 fixed to the small diameter piston 32, and the parking rod cam 15 is supported by the support 17. If the large-diameter piston 31 and the small-diameter piston 32 move in this state by a distance corresponding to the moving distance of the parking rod 14 that is in elastic contact with the parking pole 18, the small-diameter piston can be output with a large output from the small-diameter piston 32. The movement of 32 can be linked to the movement of the parking rod 14. Next, the large-diameter piston 31 is stopped by the annular stopper 34 and only the small-diameter piston 32 is moved, so that the movement of the small-diameter piston 32 is parked in a state in which the responsiveness to the hydraulic introduction introduced from the hydraulic introduction port 36 is enhanced. It can be linked to the movement of the rod 14. Therefore, when parking is released, the total hydraulic pressure supplied to the release cylinder 30 is reduced, so that the parking release hydraulic pressure is not lowered and the responsiveness can be improved.

In particular, in the parking control device according to the present embodiment, the initial period of receiving the supplied hydraulic pressure corresponds to the movement distance of the parking rod 14 in which the parking rod cam 15 is elastically contacted between the support 17 and the parking pole 18. Therefore, control with good responsiveness can be performed most efficiently without causing a decrease in the parking release hydraulic pressure.
In the parking control device of the present embodiment, the parking rod 14 is provided with holding means including an electromagnetic solenoid 40 and an actuator 60 that restrain the movement of the parking rod 14 so as to hold the parking release state of the parking rod 14. Even if the hydraulic pressure supplied to the release cylinder 30 is cut off, the parking release state can be maintained.

  In particular, the large-diameter piston 31 and the small-diameter piston 32 of the parking control device according to each of the above embodiments receive the supply hydraulic pressure in the release cylinder 30 and receive the large-diameter piston 31 in the initial stage when the oil pressure is released. The pressure rod 33 is pressed in contact with the large-diameter portion 32a of the small-diameter piston 32 to which the output rod 33 is attached, and then the end of the large-diameter piston 31 comes into contact with the annular stopper 34 disposed in the release cylinder 30 and stops. Thereafter, only the small-diameter piston 32 moves within the annular stopper 34 in the release cylinder 30, so the large-diameter piston 31, the small-diameter piston 32, the annular stopper 34, and the release cylinder 30 are only turned. Since parts can be formed, the parts cost is low, and the large-diameter piston 31 and the small-diameter piston 32 have a simple structure, and parking Lowering of the parking release pressure when releasing, responsiveness is arbitrarily set.

By the way, the annular stopper 34 of the parking control device of each of the above embodiments is annular for ease of accommodation inside the release cylinder 30, but when the present invention is implemented, the inner diameter of the release cylinder 30 is changed. Alternatively, another member in which the inner diameter of the release cylinder 30 is changed may be connected. A key groove is formed, and the movement of the large-diameter piston 31 can be stopped by a key attached to the key groove.
In carrying out the present invention, the annular stopper 34 in each of the above embodiments may be a stopper that stops the end portion of the large-diameter piston 31 in the release cylinder 30.

FIG. 1 is a cross-sectional view of a main part showing a parking state of the parking control apparatus according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part showing a parking release state of the parking control apparatus according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of a main part showing a parking release state of the parking control apparatus according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view of the main part showing the parking state above the center line of the output rod of the parking control apparatus according to the third embodiment of the present invention, and the parking release state below the center line. FIG. 5: is principal part sectional drawing which shows a parking state above the centerline of the output rod of the parking control apparatus concerning Embodiment 4 of this invention, and a parking cancellation | release state below a centerline. 6A and 6B are main part sectional views showing a parking state of the parking control apparatus according to the fifth embodiment of the present invention. FIG. 6A is a front view, and FIG. 6B is a plan view below the fan gear. It is. FIG. 7: is principal part sectional drawing which shows the parking cancellation | release state of the parking control apparatus concerning Embodiment 5 of this invention, (a) is a front view, (b) is a top view below a fan gear. FIG. 8 is an explanatory diagram showing a main part mechanism of the parking state of the purging control device.

Explanation of symbols

12 Detent lever 14 Parking rod 15 Parking rod cam 30 Release cylinder 31 Large diameter piston 32 Small diameter piston 32a Large diameter portion 32b Small diameter portion 33 Output rod 34 Annular stopper 36 Hydraulic inlet 40 Electromagnetic solenoid 60 Actuator

Claims (7)

When releasing the parking, a release cylinder that receives the hydraulic pressure supplied from the oil passage, a large-diameter piston slidably accommodated in the axial direction of the release cylinder, and an inside of the large-diameter piston are slid in the axial direction. A small-diameter piston that can be moved,
At the initial stage of receiving the supply hydraulic pressure, the large-diameter piston and the small-diameter piston are moved together, then the large-diameter piston is stopped, only the small-diameter piston is moved, and the small-diameter piston is moved. A parking control device linked to the movement of the parking rod.   The large-diameter piston is stopped when an end of the large-diameter piston housed in the release cylinder collides with an annular stopper housed in the release cylinder. Item 2. The parking control device according to Item 1.   The initial stage of receiving the supplied hydraulic pressure is set while the parking rod cam corresponds to the moving distance of the parking rod that is elastically contacted between the support and the parking pole. The parking control device described.   The parking control device according to any one of claims 1 to 3, further comprising holding means for restricting the movement of the parking rod so as to hold the parking release state of the parking rod.   The parking control device according to claim 4, wherein the holding means is a magnetic action by an electromagnetic solenoid 40 disposed in the axial direction of the small diameter piston 32.   The parking control device according to claim 4, wherein the holding unit is an actuator that drives a plunger that engages with or releases the output rod 33 of the small-diameter piston 32.   When the large-diameter piston and the small-diameter piston are initially subjected to the hydraulic pressure for releasing the parking, the large-diameter piston receives the hydraulic pressure in the release cylinder and the large-diameter piston is in contact with the small-diameter piston to which the output rod is attached. The structure is characterized in that only the small-diameter piston moves in the release cylinder when the large-diameter piston contacts and stops with a stopper disposed in the release cylinder after being pressed. The parking control device according to any one of claims 1 to 6.

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