CN110259942B

CN110259942B - Parking device for automatic transmission

Info

Publication number: CN110259942B
Application number: CN201910469183.4A
Authority: CN
Inventors: 严鉴铂; 刘义; 王亚锋; 聂幸福; 冯浩成; 王凯峰; 拜鼎邦; 朱家兴
Original assignee: Shaanxi Fast Gear Co Ltd
Current assignee: Shaanxi Fast Gear Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2021-07-23
Anticipated expiration: 2039-05-31
Also published as: CN110259942A

Abstract

The invention relates to a parking device for an automatic transmission, which solves the problems of complex structure, large volume and complex processing technology of the conventional parking mechanism. The parking device comprises a driving mechanism, a gear shifting cross rod, a cam, a parking lock valve barrel, a parking lock valve, a parking lock guide sleeve, a first return spring, a second return spring and a parking wheel; the gear shifting cross rod is fixedly connected with the cam, and the driving mechanism drives the gear shifting cross rod to rotate so as to drive the cam to rotate; the parking lock valve barrel is positioned below the cam and arranged in a parking lock guide sleeve, and the parking lock guide sleeve is fixedly arranged with the gearbox shell; the parking lock valve is arranged in the parking lock valve barrel, a first return spring is arranged between the top end of the parking lock valve barrel and the barrel top of the parking lock valve barrel, and a second return spring is sleeved on the parking lock valve and limited by a limiting block arranged in a parking lock guide sleeve; the lower end of the parking lock valve extends out of the parking lock guide sleeve and can be inserted between tooth grooves of the parking wheel to realize parking.

Description

Parking device for automatic transmission

Technical Field

The invention relates to an automatic transmission of an automobile, in particular to a parking device for the automatic transmission.

Background

With the increasing living standard, the popularity of automobiles is increasing year by year, automobiles become indispensable vehicles for traveling, and the technology of automatic transmissions is also increasing in pursuit of traveling comfort. The parking of the gearbox is a key technology of the automatic gearbox, and for the automatic gearbox, the parking function of the gearbox can be realized when a driver is in a P gear.

The parking function requires a series of mechanisms to ensure the normal operation of the parking device, wherein when the gear P is shifted, the driving device presses the parking pawl to move, so that the bulge on the parking pawl is clamped between tooth grooves of the parking wheel, and the parking function is realized. However, the parking pawl is complex in structure, large in size and complex in machining process, and in installation, the parking mechanism occupies a large space, so that the structure of the gearbox is enlarged, and the design of light weight of the transmission is not facilitated.

Disclosure of Invention

The invention aims to solve the problems of complex structure, large volume and complex processing technology of the conventional parking mechanism, and provides a parking device for an automatic transmission, which can effectively reduce the weight of the parking device, save space and simplify processing steps.

The technical scheme of the invention is as follows:

a parking device for an automatic transmission comprises a driving mechanism, a gear shifting cross rod, a cam, a parking lock valve barrel, a parking lock valve, a parking lock guide sleeve, a first return spring, a second return spring and a parking wheel; the gear shifting cross rod is fixedly connected with the cam, and the driving mechanism drives the gear shifting cross rod to rotate so as to drive the cam to rotate; the parking lock valve barrel is positioned below the cam and arranged in a parking lock guide sleeve, and the parking lock guide sleeve is fixedly arranged with the gearbox shell; the parking lock valve is arranged in the parking lock valve barrel, a first return spring is arranged between the top end of the parking lock valve barrel and the barrel top of the parking lock valve barrel, and a second return spring is sleeved on the parking lock valve and limited by a limiting block arranged in a parking lock guide sleeve; the lower end of the parking lock valve extends out of the parking lock guide sleeve and can be inserted between tooth grooves of the parking wheel to realize parking.

Further, the outer wall of the parking lock valve barrel is provided with a strip-shaped groove, a guide hole is formed in the parking lock guide sleeve, and a guide pin penetrates through the strip-shaped groove and the guide hole and is used for achieving axial relative movement of the parking lock guide sleeve and the parking lock valve barrel.

Furthermore, the upper end of the parking lock valve is provided with a notch for balancing the pressure inside and outside the parking lock valve barrel.

Further, the parking lock valve is T font cylinder structure, including spacing post and guide post, the diameter of spacing post is greater than the diameter of guide post, first return spring is located between the section of thick bamboo top of spacing post upper surface and parking lock valve barrel, second return spring suit is on the guide post.

Further, the gear shifting cross rod is a cylindrical rod, and the axis of the gear shifting cross rod is coaxial with the axis of the cam.

Further, the driving mechanism is a gear shifting motor, a gear shifting rocker arm or a hydraulic cylinder.

Compared with the prior art, the invention has the following beneficial effects:

compared with a common parking mechanism, the parking mechanism can greatly simplify the complexity of the parking device on the premise of realizing the parking function, all the mechanisms can be arranged in a radial smaller space of a gearbox, the axial space in the gearbox is not occupied, the height of the gearbox can be effectively reduced, and the universality is improved. In addition, the parking device has simple part structure and small volume, so the cost is saved.

Drawings

FIG. 1 is a schematic structural view of a parking apparatus for an automatic transmission according to the present invention;

FIG. 2 is a schematic view showing a state in which the parking apparatus for an automatic transmission of the present invention is in a P range;

FIG. 3 is a schematic view showing a state in which the parking apparatus for an automatic transmission of the present invention is in a non-P range;

FIG. 4 is a schematic structural view of a parking lock valve in the parking apparatus for an automatic transmission according to the present invention;

fig. 5 is a schematic structural view of a parking lock guide bush in the parking apparatus for an automatic transmission according to the present invention.

Reference numerals: 1-a gear shifting cross rod, 2-a cam, 3-a parking lock valve barrel, 4-a parking lock valve, 5-a parking lock guide sleeve, 6-a first return spring, 7-a second return spring, 8-a parking wheel, 9-a guide pin, 10-a driving mechanism, 31-a barrel top of the parking lock valve barrel, 32-a parking lock valve barrel top surface, 33-a strip-shaped groove, 34-a parking lock valve barrel lower end surface, 41-a limiting column, 42-a limiting column lower end surface, 43-a guide column, 44-a notch, 51-a limiting block and 52-a guide hole.

Detailed Description

The embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The invention discloses a parking device for an automatic transmission, which solves the problem of heavy and complex design of the conventional parking mechanism, can realize parking by adopting a simple driving principle, and has very simple processing and manufacturing methods, so that the manufacturing cost of a gearbox is reduced, and the internal space of the gearbox is saved. The principle is as follows: under P shelves state, cam 2 rotates to the relevant position, cam 2 and parking lock valve barrel 3 produce the effect, parking lock valve barrel 3 removes in parking lock uide bushing 5, parking lock valve barrel 3 will pass through first return spring 6 power transmission to parking lock valve 4 and overcome the effort of second return spring 7 and make parking lock valve 4 remove simultaneously, make parking lock valve 4 lower extreme card insert between the tooth's socket of parking wheel 8, realize the parking function, when non-P keeps off, parking lock valve 4 lower extreme can not take place the contact with parking wheel 8. The invention greatly simplifies the complexity of the parking mechanism, simplifies the processing procedure and the assembling procedure, effectively reduces the weight of the gearbox and saves the cost.

As shown in fig. 1 to 5, the parking apparatus for an automatic transmission includes a driving mechanism 10, a shift rail 1, a cam 2, a parking lock cylinder 3, a parking lock valve 4, a parking lock guide sleeve 5, first and

second return springs

6 and 7, a parking wheel 8, and a guide pin 9.

The shift rail 1 may be a cylindrical rod or other rod member, the power of the shift rail 1 is derived from a driving mechanism 10, the driving mechanism 10 may be, but is not limited to, a shift motor, a shift rocker, a hydraulic cylinder, etc., the axial position of the shift rail 1 is fixed relative to the position of the entire transmission, and the shift rail 1 may rotate around its central axis under the driving of the driving mechanism 10. Cam 2 is the rotating member that has the curve profile, and its self has the rotation axis, cam 2 and the horizontal pole 1 fixed connection that shifts, and the axis of cam 2 and the axis of the horizontal pole 1 of shifting are on same line, and cam 2 is driven by the horizontal pole 1 of shifting, can realize with the synchronous rotation of horizontal pole 1 of shifting. The curve profile of the cam 2 needs to be designed, so as to ensure that when the gear is not in the P gear and other mechanisms of the transmission normally operate, the action of the cam 2 on the parking lock valve barrel 3 cannot enable the parking lock valve 4 to be clamped between tooth grooves of the parking wheel 8 to cause parking, and the parking function can be realized only when the gear is switched to the P gear.

The parking lock valve barrel 3 is a cylindrical thin-wall structure with a cylindrical hole drilled from the lower part, and the parking lock valve barrel 3 is positioned below the cam 2 and arranged in the parking lock guide sleeve 5. In the P range, the parking lock cylinder top surface 32 contacts with the side surface of the cam 2, and can slide along the inner wall of the parking lock guide sleeve 5 under the pressure of the side surface of the cam 2, that is, the parking lock cylinder 3 is limited to move axially in the parking lock guide sleeve 5.

The parking lock guide sleeve 5 and the transmission shell are integrally cast, and an inner hole is machined through machining. The parking lock cylinder 3 is axially displaceable within the parking lock guide sleeve 5 along the inner surface of the parking lock guide sleeve 5. The outer wall of the parking lock valve barrel 3 is provided with a strip-shaped groove 33 along the movement direction, the parking lock guide sleeve 5 is provided with a guide hole 52, the guide pin 9 extends into the guide hole 52, and the guide pin 9 also extends into the strip-shaped groove 33 at the same time, so that the parking lock guide sleeve 5 and the parking lock valve barrel 3 can move relatively along the axial direction, but the guide pin 9 is not fixed with the strip-shaped groove 33 of the parking lock valve barrel, and the movement of the parking lock valve barrel 3 between a P gear and a non-P gear can not be influenced. Meanwhile, the guide pin 9 can limit the position of the parking lock valve barrel 3, and the parking lock valve barrel 3 can be prevented from falling off during assembly of the parking device.

Parking lock valve 4 sets up in parking lock valve barrel 3, for T shape cylinder structure, including spacing post 41 and guide post 43, the diameter of spacing post 41 is greater than the diameter of guide post 43, install first return spring 6 between the bobbin top 31 of spacing post 41 and parking lock valve barrel, first return spring 6 can make parking lock valve barrel 3 by jack-up under non-P keeps off the state, during the installation, ensure that the bobbin top 31 (spacing top of the post) of parking lock valve barrel contacts with first return spring 6, ensure that it is by jack-up when non-P keeps off. That is, the top surface of the position-limiting post contacts the first return spring 6, so as to ensure that the position-limiting post moves under the action of the first return spring 6. The second return spring 7 is sleeved on the guide post 43 and is limited by a limiting block 51 arranged in the parking lock guide sleeve 5, when the parking lock is installed, one end of the second return spring 7 is in contact with the lower end face 42 of the limiting post, the other end of the second return spring is in contact with the upper end face of the limiting block 51, the parking lock valve 4 can be jacked up under the non-P gear state, and the parking state is cancelled. The motion of parking lock valve 4 is restricted in parking lock valve barrel 3, can carry out axial motion, and when P kept off, the lower extreme of guide post 43 can stretch out the bottom of parking lock uide bushing 5, can insert between the tooth's socket of parking wheel 8, realizes parking wheel 8 locking. Since the parking wheel 8 is rigidly connected to the output shaft of the transmission, when the parking wheel 8 is locked, the output shaft of the transmission also has no rotational speed output, so that the parking function is realized.

The upper end of the parking lock valve 4 is provided with a notch 44, the parking lock valve barrel 3 can be communicated with two cavities separated by the limiting column 41 through the notch 44, and the strip-shaped groove 33 on the parking lock valve barrel 3 is also communicated with the outside, so that oil can be prevented from being accumulated in the cavity formed by the upper cavity and the lower cavity of the parking lock valve barrel 3, the oil can be discharged in time, and the influence on the movement of a component can be prevented.

When the transmission is in the non-P gear, the parking device is in the following state: the parking lock valve 4 is jacked up by the second return spring 7, the rotation of the parking wheel 8 cannot be influenced by the lower end of the parking lock valve 4, and the lower end of the parking lock valve 4 cannot be separated from the limitation of the bottom of the parking lock guide sleeve 5. The first return spring 6 above the parking lock valve 4 lifts the parking lock cylinder 3, the parking lock cylinder top 32 being in lateral contact with the cam 2.

When the transmission is switched from the non-P gear to the P gear, the gear shifting cross rod 1 rotates to drive the cam 2 to synchronously rotate, the side face, far away from the cam rotation axis, of the cam 2 contacts with the top face 32 of the parking lock valve barrel to force the parking lock valve barrel 3 to move towards the direction far away from the cam rotation axis, the first return spring 6 is forced to be further compressed by the movement of the parking lock valve barrel 3, the elastic force of the first return spring 6 acts on the parking lock valve 4 to enable the parking lock valve 4 to move towards the direction far away from the cam rotation axis, the lower end of the parking lock valve 4 extends out of the lower part of the parking lock guide sleeve 5 and is clamped between tooth grooves of the parking wheel 8, and the parking function is achieved. At this time, the parking lock valve 4 may be just caught between the tooth grooves of the parking wheel 8.

In the case of switching from the non-P range to the P range, the lower end of the parking lock valve 4 may not be properly caught between the tooth grooves of the parking wheel 8, but may contact the tooth tips of the parking wheel 8. In this case, the P-range rotates the cam 2 to the corresponding position, forcing the parking lock cylinder 3 to move away from the cam rotation axis, the first return spring 6 is compressed, but the parking lock valve 4 can only be displaced slightly compared to the normal situation due to the contact of the parking lock lower end with the tooth top of the parking wheel 8, and at this time, the first return spring 6 has a larger compression amount than usual due to the limitation of the parking lock valve 4. However, in this state, the parking device does not function to lock the parking wheel 8, but when the vehicle receives a disturbance, the vehicle moves and the parking wheel 8 rotates. When the parking wheel 8 rotates to enable the lower end of the parking lock valve 4 to move downwards continuously, the parking lock valve 4 can move downwards under the spring force of the first return spring 6, the parking lock valve 4 can move downwards, and the lower end of the parking lock valve 4 can be clamped between tooth grooves of the parking wheel 8, so that the parking function is achieved.

In the whole implementation process of the parking function, the following items are as follows:

in the case of non-P gear, it is ensured that the parking lock valve cylinder 3 is in contact with the cam 2 under the spring force of the first return spring 6, and the contact of the two is not influenced by the guide pin 9; the parking lock valve barrel 3 is surrounded by the parking lock guide sleeve 5, namely, the parking lock valve barrel 3 cannot be separated from the parking lock guide sleeve 5; the parking lock valve 4 is to be surrounded by the parking lock cylinder 3, i.e. the parking lock valve 4 must not be disengaged from the parking lock cylinder 3; the lower end of the parking lock valve 4 cannot be separated from the parking lock guide sleeve, and the lower end of the parking lock valve 4 cannot be contacted with the parking wheel 8.

In the P range, the parking lock cylinder lower end surface 34 is ensured not to contact the bottom surface of the parking lock guide sleeve 5, so as to prevent the cam 2 from rotating to a predetermined position.

When the lower end of the parking lock valve 4 contacts with the tooth crest of the parking wheel 8 in the P gear, it is ensured that the first return spring 6 does not reach the pressed state and is within a reasonable compression interval. When P keeps off and 4 lower extreme cards of parking lock valve between the 8 tooth's socket of parking wheel, second return spring 7 does not reach pressure and state, and within its reasonable compression volume interval, parking lock valve 4 must not break away from parking lock valve section of thick bamboo 3, and parking lock valve 4 lower extreme must stretch out outside parking lock uide bushing 5, the card realizes the parking function between the 8 tooth's socket of parking wheel.

Claims

1. A parking device for an automatic transmission, characterized in that: the parking lock device comprises a driving mechanism (10), a gear shifting cross rod (1), a cam (2), a parking lock valve barrel (3), a parking lock valve (4), a parking lock guide sleeve (5), a first return spring (6), a second return spring (7) and a parking wheel (8);

the gear shifting cross rod (1) is fixedly connected with the cam (2), and the driving mechanism (10) drives the gear shifting cross rod (1) to rotate so as to drive the cam (2) to rotate;

the parking lock valve barrel (3) is positioned below the cam (2) and arranged in the parking lock guide sleeve (5), and the parking lock guide sleeve (5) is fixedly arranged with the gearbox shell;

the parking lock valve (4) is arranged in the parking lock valve barrel (3), a first return spring (6) is arranged between the top end of the parking lock valve barrel and a barrel top (31) of the parking lock valve barrel, and the second return spring (7) is sleeved on the parking lock valve (4) and is limited by a limiting block (51) arranged in the parking lock guide sleeve (5); the lower end of the parking lock valve (4) extends out of the parking lock guide sleeve (5) and can be inserted between tooth grooves of parking wheels (8) to realize parking;

the parking lock valve barrel is characterized in that a strip-shaped groove (33) is formed in the outer wall of the parking lock valve barrel (3), a guide hole (52) is formed in the parking lock guide sleeve (5), and a guide pin (9) penetrates through the strip-shaped groove (33) and the guide hole (52) and is used for realizing the relative movement of the parking lock guide sleeve (5) and the parking lock valve barrel (3) along the axial direction;

the upper end of the parking lock valve (4) is provided with a notch (44) for balancing the pressure inside and outside the parking lock valve barrel (3).

2. The parking device for an automatic transmission according to claim 1, characterized in that: parking lock valve (4) are T font cylinder structure, including spacing post (41) and guide post (43), the diameter of spacing post (41) is greater than the diameter of guide post (43), first return spring (6) are located between top surface and the bobbin top (31) of parking lock valve barrel on spacing post (41), second return spring (7) suit is on guide post (43).

3. The parking device for an automatic transmission according to claim 2, characterized in that: the gear shifting cross rod (1) is a cylindrical rod, and the axis of the gear shifting cross rod is coaxial with the axis of the cam (2).

4. The parking device for an automatic transmission according to claim 3, characterized in that: the driving mechanism (10) is a gear shifting motor.

5. The parking device for an automatic transmission according to claim 3, characterized in that: the driving mechanism (10) is a gear shifting rocker arm.

6. The parking device for an automatic transmission according to claim 3, characterized in that: the driving mechanism (10) is a hydraulic cylinder.