CN114382881A

CN114382881A - Parking lock

Info

Publication number: CN114382881A
Application number: CN202011117226.1A
Authority: CN
Inventors: 刘磊; 王秋凤
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2022-04-22

Abstract

The invention provides a parking lock which is used for controlling the locking and rotation of a locking wheel (G) of a vehicle, and comprises a shaft (10), a pushing piece (20), a guide frame (30) and clamping jaws (60), wherein at least part of the axial region of the shaft (10) is provided with an external thread, the shaft (10) can rotate around the axis of the shaft, the pushing piece (20) is provided with a threaded hole (21), the pushing piece (20) is sleeved on the shaft (10), the external thread of the shaft (10) is screwed with the internal thread of the threaded hole (21), the guide frame (30) provides support and limit for the pushing piece (20), so that the pushing member (20) can only reciprocate in the axial direction (A) of the shaft (10) relative to the guide frame (30), the jaws (60) can swing relative to the guide frame (30) to realize the engagement and disengagement with the locking wheel (G), and the reciprocating motion of the pushing member (20) in the axial direction (A) provides a driving force for the swinging of the jaws (60). The parking lock has the advantages of simple structure, low cost and high reliability.

Description

Parking lock

Technical Field

The invention relates to the field of vehicles, in particular to a parking lock of a vehicle.

Background

Parking locks may be used, for example, in transmissions of motor vehicles to ensure that the vehicle does not slip undesirably.

For example, PCT patent publication WO2013/020779a1 discloses a parking lock. The roller type rolling mechanism comprises a motor, a roller transmission unit, a push rod, a rolling head unit and a locking claw.

The roller transmission unit comprises a sun wheel, a plurality of planetary wheels with threads and surrounding the sun wheel and a hollow wheel. The ring gear is supported by the housing and can be driven by a power supply unit, such as an electric motor. The rotation of the hollow wheel drives the planet wheel and the sun wheel to rotate, and the motion is transmitted to the push rod, so that the push rod reciprocates along the axial direction.

The rolling head unit includes three rolling bearings and a bracket for supporting the rolling bearings. Each rolling bearing comprises an inner ring, an outer ring and rolling bodies. The bracket is fixed to a housing of the transmission.

The locking dog can be pushed by the rolling head unit to engage with the locking wheel to realize the parking function. When the pushing force on the locking claw is removed, the locking claw can be separated from the locking wheel under the action of the return spring.

The parking lock has a complex structure, contains many parts, and has high cost and low reliability.

The rolling head unit and the roller transmission unit in the parking lock require high precision and high manufacturing cost.

Disclosure of Invention

The object of the present invention is to overcome or at least alleviate the above-mentioned drawbacks of the prior art and to provide a parking lock of simple construction.

The invention provides a parking lock which is used for controlling the locking and the rotation of a locking wheel of a vehicle and is characterized by comprising a shaft, a pushing piece, a guide frame and a claw,

at least part of the axial region of the shaft is provided with an external thread, the shaft can rotate around the axis of the shaft,

the pushing piece is provided with a threaded hole, the pushing piece is sleeved on the shaft, the external thread of the shaft is screwed with the internal thread of the threaded hole,

the guide frame provides support and limit for the pushing piece, so that the pushing piece can only reciprocate in the axial direction of the shaft relative to the guide frame,

the claw can swing relative to the guide frame to realize the engagement and disengagement with the locking wheel, and the pushing piece reciprocates in the axial direction to provide driving force for the swing of the claw.

In at least one embodiment, the parking lock further includes a pressing head and an elastic member, the pushing member, the pressing head and the elastic member being coaxially disposed, the elastic member being installed between the pressing head and the pushing member,

during the reciprocating motion of the pushing piece in the axial direction, the elastic piece keeps applying elastic force to the pressure head, and the pressure head keeps contacting with the clamping jaws.

In at least one embodiment, the guide frame provides support and a stop for the ram such that the ram can only reciprocate in the axial direction of the shaft relative to the guide frame.

In at least one embodiment, the guide frame is formed with a groove extending in the axial direction, the peripheral wall of the pusher member at least partially protrudes radially outward to form a pusher projection, the peripheral wall of the ram at least partially protrudes radially outward to form a ram projection, and both the pusher projection and the ram projection are at least partially embedded in the groove and guided and restrained by the groove.

In at least one embodiment, the guide frame comprises a first side panel and a second side panel which are oppositely arranged, the pushing piece, the pressing head and the elastic piece are arranged between the first side panel and the second side panel,

one of said slots is formed in each of said first side panel and said second side panel,

two pushing member protrusions are arranged, the two pushing member protrusions respectively extend into the groove on the first side panel and the groove on the second side panel,

the pressure head is provided with two pressure head bulges, and the two pressure head bulges extend into the groove on the first side panel and the groove on the second side panel respectively.

In at least one embodiment, the opposing inner sides of the first and second side panels each abut the peripheral wall of the pusher, and the opposing inner sides of the first and second side panels each abut the peripheral wall of the ram.

In at least one embodiment, both ends of the groove in the axial direction have a stopper portion for restricting the axial positions of the pushing member and the ram.

In at least one embodiment, the elastic member is a coil spring, an axial end surface of the pushing element facing the ram partially protrudes toward the ram to form a cylindrical pushing element boss, an axial end surface of the ram facing the pushing element partially protrudes toward the pushing element to form a cylindrical ram boss, and two axial end portions of the coil spring are respectively sleeved on the pushing element boss and the ram boss.

In at least one embodiment, the jack catch can rotate and install in the leading truck, still be formed with the spring fixed part on the leading truck, the jack catch with be equipped with return spring between the spring fixed part, return spring applys to the jack catch make the jack catch with the power that the locking wheel was separated.

In at least one embodiment, the parking lock further comprises a motor for driving the shaft.

The parking lock has the advantages of simple structure, low cost and high reliability.

Drawings

Fig. 1 is a schematic view of a parking lock according to an embodiment of the present invention.

Fig. 2 is a schematic view of fig. 1 taken along an axial direction a.

Fig. 3 is a schematic view of a guide frame of a parking lock according to an embodiment of the present invention.

FIG. 4 is a schematic view of a pusher of the parking lock according to one embodiment of the present invention.

FIG. 5 is a cross-sectional schematic view of a parking lock at a pusher according to one embodiment of the present invention.

Fig. 6 is a schematic view of a ram of the parking lock according to an embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of a parking lock at a ram according to an embodiment of the present invention.

Description of reference numerals:

10 shafts;

20 a pusher member; a 20m pusher body; 21 a threaded hole; 22 the pusher projection; 23 pusher boss; 24a base step; 24a step surface;

30a guide frame; 30a guide groove; a spring fixing part for 30 h; 31 a first side panel; 32 a second side panel;

40 indenter; a 40m ram body; 41, a pressure head bulge; 42 pressure head convex columns; 43a base step; 43a step surface;

50 an elastic member; 60 claws; 70 a return spring; 80, a stop block;

g locking wheels.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.

Referring to fig. 1 to 7, a parking lock according to the present invention will be described, and referring to fig. 2, a indicates an axial direction of the parking lock, which is identical to an axial direction of a shaft 10 in the parking lock, unless otherwise specified; r denotes the radial direction of the parking lock, which corresponds to the radial direction of the shaft 10 in the parking lock.

Referring to fig. 1 and 2, the parking lock according to the present invention includes a motor E, a shaft 10, a push member 20, a guide bracket 30, a pressing head 40, an elastic member 50, a claw 60, a return spring 70, and a stopper 80.

The shaft 10 is connected to the output shaft of the electric machine E in a rotationally fixed manner (non-rotatable manner), or the shaft 10 belongs to the output shaft of the electric machine E. It should be understood that a reduction gear may also be installed between the shaft 10 and the motor E.

At least a partial region of the outer peripheral wall of the shaft 10 in the axial direction a has an external thread.

The pusher 20 has a substantially cylindrical shape, and the middle portion of the pusher 20 has a threaded hole 21 extending in the axial direction a (see also fig. 4). The pushing member 20 is sleeved on the shaft 10, and the internal thread of the threaded hole 21 is screwed with the external thread of the shaft 10. Thus, in the case where it is defined that the pusher 20 cannot rotate about its own axis, when the shaft 10 rotates, the relative rotation of the pusher 20 with respect to the shaft 10 will bring about the reciprocating motion of the pusher 20 with respect to the shaft 10 in the axial direction a.

The guide frame 30 is provided with a guide groove 30a extending in the axial direction a, and the guide groove 30a provides a guide for the reciprocating motion of the pushing member 20. As will be further described below.

The reciprocating movement of the pusher 20 in the axial direction a provides a driving force for the movement of the jaws 60, and in order to provide a buffer between the pusher 20 and the jaws 60, a ram 40 and an elastic member 50 are provided. The pressing head 40 and the elastic member 50 can buffer an undesirable impact on the pushing member 20 due to the impact between the locking wheel G and the jaws 60, for example, in the case where the jaws 60 are not successfully engaged with the locking wheel G, or in the case where the parking environment is changed after parking, for example, thereby protecting the motor E.

The elastic member 50 is preferably a compressed coil spring, and the elastic member 50 is disposed between the push member 20 and the ram 40 to connect the push member 20 and the ram 40. The ram 40 partially protrudes into the guide groove 30a to reciprocate in the axial direction a guided by the guide groove 30 a.

The jaw 60 is rotatably connected with the guide frame 30, and a return spring 70 is provided between the jaw 60 and the guide frame 30. Rotation of the pawl 60 relative to the guide frame 30 (e.g., clockwise rotation of the pawl 60 in fig. 2) can cause the locking portion of the pawl 60 to engage with the toothed portion of the locking wheel G to lock the locking wheel G, or (e.g., counterclockwise rotation of the pawl 60 in fig. 2) cause the locking portion of the pawl 60 to disengage from the toothed portion of the locking wheel G to allow rotation of the locking wheel G.

The return spring 70 applies a force for separating the locking portion of the pawl 60 from the toothed portion of the locking wheel G to the pawl 60. When the ram 40 applies an urging force to the dog 60 that causes the locking portion of the dog 60 to enter between the adjacent teeth of the locking wheel G, and the urging force is greater than the elastic force of the return spring 70, the dog 60 gradually engages with the locking wheel G. When the urging force of the ram 40 is gradually removed, or the elastic force of the return spring 70 is greater than the urging force of the ram 40, the pawl 60 is gradually separated from the lock wheel.

Preferably, a spring fixing portion 30h for fixing one end portion of the return spring 70 is formed on the guide frame 30. The other end of the return spring 70 is fixed to the pawl 60.

Next, with reference to fig. 3 to 5, a specific connection structure of the pushing member 20, the guide frame 30 and the elastic member 50 will be described.

Preferably, referring to fig. 3, the guide frame 30 includes a first side panel 31 and a second side panel 32 that are oppositely disposed. To facilitate the installation of the jaws 60, the first side panel 31 has a size larger than that of the second side panel 32, and the jaws 60 are installed to the first side panel 31. It should be understood that in other possible embodiments, the dogs 60 may be mounted not to the guide frame 30, but via other mounting platforms, such as dogs 60 mounted directly to the housing of the transmission.

The two side plates (the first side plate 31 and the second side plate 32) are used for accommodating the main body of the pushing piece 20 (the pushing piece main body 20m) and the main body of the pressure head 40 (the pressure head main body 40 m). Both side panels are provided with guide grooves 30a extending in the axial direction a.

In the present embodiment, the guide groove 30a penetrates through the first side panel 31 and the second side panel 32 in the thickness direction of the side panels. It should be understood that the guide groove 30a may also be a recessed area of the opposite faces of the two side panels, without penetrating the side panels in the thickness direction of the side panels.

The guide groove 30a is open at one end and closed at the other end in the axial direction a, so that the pushing member 20 and the ram 40 can be partially inserted into the guide groove from the open end and be restrained at the closed end.

Preferably, after the pushing member 20 and ram 40 have been installed with the channel 30a, a stop 80 (see fig. 1) is provided at the open end of the channel 30a to limit the pushing member 20 at this end. The stopper 80 is fixed to the guide frame 30 by welding, for example.

Preferably, the guide frame 30 can be mounted to a transmission case of a vehicle by, for example, bolting, for example, two bolt holes for fixing bolts are provided on the guide frame 30.

Referring to fig. 4 and 5 together, the pusher body 20m has a generally cylindrical shape with two base steps 24 formed on an outer peripheral wall thereof in opposition in the radial direction R, and opposite step faces 24a of the two base steps 24 are adapted to abut against inner side faces of the first side plate 31 and the second side plate 32, which are opposed to each other, respectively. The distance between the opposed step faces 24a of the two base steps 24 is substantially equal to the distance between the first side panel 31 or the second side panel 32.

Each base step 24 also forms a pusher projection 22 projecting radially outwardly, the pusher projection 22 being adapted to project at least partially into the channel 30 a. Preferably, the width of the pusher projection 22 is substantially equal to the width of the guide groove 30a in the width direction of the guide groove 30 a.

Thus, the urging member 20 is restrained both circumferentially and radially R within the guide groove 30a, and the urging member 20 can reciprocate only in the axial direction a with respect to the guide groove 30 a.

Preferably, the middle area of the end surface of the pushing member 20 facing the ram 40 is partially protruded to form a pushing member boss 23, and the diameter of the pushing member boss 23 is substantially equal to the diameter (inner diameter) of the elastic member 50, so that the elastic member 50 can be fittingly sleeved on the pushing member boss 23 to be connected with the pushing member 20.

Next, referring to fig. 6 and 7, a detailed coupling structure of the pressing head 40 with the guide frame 30 and the elastic member 50 will be described. Ram 40 has a profile that mimics pusher member 20.

The ram body 40m is substantially cylindrical, and two base steps 43 opposed in the radial direction R are formed on the outer peripheral wall thereof, and the opposite step faces 43a of the two base steps 43 are respectively for abutting against the inner side faces of the first side face plate 31 and the second side face plate 32 opposed to each other. The distance between the opposing step faces 43a of the two base steps 43 is substantially equal to the distance between the first side panel 31 or the second side panel 32.

Each base step 43 of the indenter 40 further forms an indenter projection 41 projecting radially outward, the indenter projection 41 being adapted to project at least partially into the guide groove 30 a. Preferably, the width of the indenter protrusion 41 is substantially equal to the width of the guide groove 30a in the width direction of the guide groove 30 a.

Thus, the ram 40 is restrained both circumferentially and radially R within the guide groove 30a, and the ram 40 can reciprocate only in the axial direction a relative to the guide groove 30 a.

Preferably, a middle area of the end surface of the pressing head 40 facing the pushing member 20 is partially formed convexly with a pressing head boss 42, and the diameter of the pressing head boss 42 is substantially equal to the diameter (inner diameter) of the elastic member 50, so that the elastic member 50 can be fittingly sleeved on the pressing head boss 42 to be connected with the pressing head 40.

In each state of the parking lock, the elastic member 50 is continuously compressed to apply a certain pushing force to the pressing head 40, so that the pressing head 40 is kept in contact with the claw 60.

The invention has at least one of the following advantages:

(i) the parking lock has the advantages of simple structure, small number of parts, low cost and high reliability.

(ii) The pushing member 20, the guide frame 30, the ram 40, the elastic member 50, the jaws 60, the return spring 70 and the stopper 80 (and the shaft 10) can be integrally installed for convenience of production and management.

(iii) The thrust generated between the pushing piece 20 and the pressure head 40 can be further transmitted to the shell of the transmission through the guide frame 30, and the parts of the parking actuator have high reliability and long service life.

(iv) The matching relationship between the pushing piece protrusion 22 and the pressing head protrusion 41 and the guide groove 30a makes the pushing piece 20 and the pressing head 40 move smoothly and smoothly in a reciprocating manner relative to the guide frame 30, and the working state of the parking actuator is ideal.

Of course, the present invention is not limited to the above-described embodiments, and those skilled in the art can make various modifications to the above-described embodiments of the present invention without departing from the scope of the present invention under the teaching of the present invention. For example:

(i) the guide groove 30a may be replaced by, for example, a convex guide structure, for example, opposing inner side surfaces of the first side surface plate 31 and the second side surface plate 32 partially protrude to form a guide rail extending in the axial direction a, and peripheral wall portions of the pusher 20 and the ram 40 are partially recessed radially inward to form a recess that fits in the guide rail.

(ii) The outer contours of the pushing member 20 and the pressing head 40 are not limited in the present invention, and for example, the outer contour of the pushing member 20 may be substantially elliptical cylindrical or substantially rectangular parallelepiped.

Claims

1. Parking lock for controlling the locking and rotation of a locking wheel (G) of a vehicle, characterized in that it comprises a shaft (10), a push (20), a guide (30) and jaws (60),

at least part of the axial region of the shaft (10) is provided with an external thread, the shaft (10) can rotate around the axis thereof,

the pushing piece (20) is provided with a threaded hole (21), the pushing piece (20) is sleeved on the shaft (10), the external thread of the shaft (10) is screwed with the internal thread of the threaded hole (21),

the guide frame (30) provides support and limit for the pushing member (20) so that the pushing member (20) can only reciprocate in the axial direction (A) of the shaft (10) relative to the guide frame (30),

the jaws (60) are swingable relative to the guide frame (30) to effect engagement and disengagement with the locking wheel (G), and the reciprocating movement of the pusher (20) in the axial direction (a) provides a driving force for the swinging of the jaws (60).

2. Parking lock according to claim 1, characterized in that it further comprises a pressure head (40) and an elastic member (50), said push member (20), said pressure head (40) and said elastic member (50) being coaxially arranged, said elastic member (50) being mounted between said pressure head (40) and said push member (20),

during the reciprocating motion of the pushing piece (20) in the axial direction (A), the elastic piece (50) keeps applying elastic force to the pressing head (40), and the pressing head (40) keeps contacting with the clamping jaws (60).

3. Parking lock according to claim 2, characterized in that the guide frame (30) provides support and stop for the ram (40) such that the ram (40) can only reciprocate in the axial direction (a) of the shaft (10) relative to the guide frame (30).

4. Parking lock according to claim 2, characterized in that said guide frame (30) is formed with a groove (30a) extending in said axial direction (a), the peripheral wall of said pusher (20) at least partially projecting radially outwards to form a pusher projection (22), the peripheral wall of said indenter (40) at least partially projecting radially outwards to form an indenter projection (41), said pusher projection (22) and said indenter projection (41) each being at least partially inserted in said groove (30a) to be guided and retained by said groove (30 a).

5. Parking lock according to claim 4, characterized in that said guide frame (30) comprises a first side plate (31) and a second side plate (32) arranged opposite each other, said push member (20), said pressure head (40) and said elastic member (50) being arranged between said first side plate (31) and said second side plate (32),

the first side panel (31) and the second side panel (32) each have one of the slots (30a),

two pushing part bulges (22) are provided, the two pushing part bulges (22) respectively extend into the groove (30a) of the first side panel (31) and the groove (30a) of the second side panel (32),

the number of the pressure head bulges (41) is two, and the two pressure head bulges (41) respectively extend into the groove (30a) on the first side panel (31) and the groove (30a) on the second side panel (32).

6. Parking lock according to claim 5, characterized in that the opposite inner sides of the first and second side panels (31, 32) abut against the peripheral wall of the push piece (20), and the opposite inner sides of the first and second side panels (31, 32) abut against the peripheral wall of the pressure head (40).

7. Parking lock according to claim 4, characterized in that said groove (30a) has, at both ends in the axial direction (A), limit stops for limiting the axial position of the push member (20) and of the ram (40).

8. Parking lock according to claim 2, characterized in that the elastic element (50) is a helical spring, the axial end face of the push element (20) facing the ram (40) forms a cylindrical push element stud (23) partially projecting towards the ram (40), the axial end face of the ram (40) facing the push element (20) forms a cylindrical push element stud (42) partially projecting towards the push element (20), the two axial ends of the helical spring being fitted to the push element stud (23) and the ram stud (42), respectively.

9. The parking lock according to claim 1, wherein the claw (60) is rotatably mounted to the guide frame (30), a spring fixing portion (30h) is further formed on the guide frame (30), a return spring (70) is provided between the claw (60) and the spring fixing portion (30h), and the return spring (70) applies a force to the claw (60) to separate the claw (60) from the locking wheel (G).

10. Parking lock according to claim 1, characterized in that it further comprises an electric motor (E) for driving the shaft (10).