Hub motor parking mechanism

Abstract

The utility model provides a wheel hub motor parking mechanism which comprises a base, a locking disc, a clamping jaw and a linear push-pull mechanism, and the base is fixed to the side, not rotating along with wheels, of a wheel hub motor; the locking disc is rotationally arranged in the base and fixed to a rotating shaft of the hub motor, the locking disc comprises a protruding block, and the protruding block deviates from the axis of the rotating shaft of the hub motor; the number of the clamping jaws is two, the opposite ends of the clamping jaws are hinged into the base, and the protruding block selectively abuts against one of the two clamping jaws. According to the hub motor parking mechanism, the locking disc and the clamping jaw are arranged, parking torque generated by traditional friction force is changed into a parking top block limiting mode to provide the parking torque, the parking torque is formed more easily, and after the forming mode of the parking torque is changed, the parking torque is not limited to the friction force between the brake disc and the parking mechanism any more; instead, depending on the yield limit of the material, larger parking torque is provided by fully utilizing structural characteristics and material characteristics, and the number of parts of the parking device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parking, in particular to a hub motor parking mechanism. Background Art

[0002] With the development of new energy vehicles, the application of hub motors is becoming more and more common. Generally, hub motors will occupy a relatively large hub space, restricting the layout space and function realization of driving brakes and parking brakes. Traditional integrated driving and parking cable-type parking mechanisms and electronic EPB parking mechanisms cannot be used.

[0003] Currently, there are mainly two methods. One is a parking caliper similar to a driving caliper, which is a hydraulic caliper with a built-in energy storage spring for permanent parking. This type of parking caliper requires an accumulator to establish a stable pressure in the parking pipeline to ensure that the energy storage spring is lifted during driving so that the parking release state can be achieved, and it is necessary to maintain the stability of the parking pipeline pressure. Usually, it is symmetrically arranged with the driving caliper, which will occupy the space of the driving brake. For example, the hub motor parking structure applicable to a floating caliper with the publication number CN218468134U; the other is separately arranged on the other side of the hub motor from the driving caliper, using an energy storage spring-type hydraulic parking caliper or an electronic parking caliper. The former requires an accumulator to provide a stable pressure source, and the latter requires a relatively large size space and mass to provide a certain parking torque.

[0004] Regardless of which of the above parking structures is used, it will occupy a relatively large space, increasing the difficulty of vehicle space configuration. Content of the Utility Model

[0005] In view of this, the utility model provides a hub motor parking mechanism. By cooperating the claw with the convex block to lock the rotating shaft of the hub motor, the parking torque is no longer limited to the frictional force between the brake disc and the parking mechanism, nor does it require the energy of a power source positively correlated with the parking torque. By making full use of the structural characteristics and material properties, a larger parking torque is provided, the number of parts of the parking device is streamlined, the parking mechanism is lighter and more compact, and the flexibility of vehicle space configuration is improved.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a hub motor parking mechanism, including a base, a locking disc, a claw and a linear push-pull mechanism. Among them,

[0007] The base is fixed on the side of the hub motor that does not rotate with the wheel;

[0008] The locking disc is rotatably arranged in the base and is fixed to the rotating shaft of the hub motor. The locking disc includes a convex block, and the convex block deviates from the axis of the rotating shaft of the hub motor;

[0009] There are two claws, which are arranged opposite to each other, and the ends of the two claws that are separated from each other are hinged to the base, and the protrusion selectively abuts against one of the two claws;

[0010] The linear push-pull mechanism is fixed in the base and has a linear movable end, which can move along the diameter direction of the hub motor shaft and is flexibly connected to the two claws, and is used to push at least one of the two claws to approach or move away from the locking plate;

[0011] When one of the two claws abuts against the protrusion, the claw blocks the protrusion from moving toward the abutting side, and the linear movable end selectively pushes the other claw away from the locking plate.

[0012] On the basis of the above technical solution, preferably, it also includes a flexible connection component, which is fixed on the linear movable end and is transmission-connected to the two claws.

[0013] Further preferably, the flexible connection assembly includes two first elastic members, one end of each of the two first elastic members is arranged on the linear movable end, and the other end is respectively arranged on two claws.

[0014] More preferably, the flexible connection assembly further includes a connection seat and two supports, wherein:

[0015] The connecting seat is fixed on the linear movable end;

[0016] The two supports are respectively hinged at two ends of the connecting seat and are respectively fixed to the two first elastic members.

[0017] On the basis of the above technical solution, preferably, an arc groove is provided on a side of the claw close to the locking disk.

[0018] On the basis of the above technical solution, preferably, a sealing cover is further included, one side of the base is provided with an opening, and the sealing cover is fixed to the opening side of the base to seal the opening of the base.

[0019] On the basis of the above technical solution, preferably, the locking disc further includes a connecting shaft and a disc body, wherein:

[0020] One end of the connecting shaft extends to the outside of the base and is fixed coaxially with the rotating shaft of the hub motor. The connecting shaft is rotatably arranged on the base through a bearing;

[0021] The disc body is fixed on one end of the connecting shaft located inside the base, and the convex block is fixed on the outer side of the disc body.

[0022] Further preferably, there are multiple protrusions, which are distributed on the disc in a ring shape with the connecting shaft as the center.

[0023] Based on the above technical solutions, preferably, it further includes two second elastic members. One ends of the two second elastic members are respectively arranged on the two claws, and the other ends are both arranged on the base.

[0024] Based on the above technical solutions, preferably, the two claws are mirror images of each other.

[0025] The hub motor parking mechanism of the present utility model has the following beneficial effects compared with the prior art:

[0026] (1) By setting the locking disc and the claws, the parking torque generated by traditional friction is changed to the way of providing parking torque by the limit of the parking top block. The structure is simpler, the formation of the parking torque is easier, and after the formation method of the parking torque is changed, the parking torque is no longer limited to the friction between the brake disc and the parking mechanism, nor does it require the power source energy that is positively correlated with the parking torque, but depends on the yield limit of the material. By making full use of the structural characteristics and material properties, a larger parking torque is provided, the number of parts of the parking device is streamlined, and it is lighter and more compact.

[0027] (2) By setting the flexible connection component, the state switching of parking can be completed through a simple elastic member and a push rod mechanism, realizing the functions of parking and parking release, which is convenient and reliable. At the same time, in positions such as slopes, after starting the vehicle and releasing the foot brake, by restricting the one-way rotation of the hub motor, the vehicle is prevented from slipping down, providing the driver with the time to step on the throttle stroke required to adapt to the slope, and improving the driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a general assembly schematic diagram of the hub motor parking mechanism of the present utility model and the hub motor;

[0030] Figure 2 It is an exploded view of the hub motor parking mechanism of the present utility model;

[0031] Figure 3 It is a schematic diagram of the parking release state of the hub motor parking mechanism of the present utility model;

[0032] Figure 4 It is a schematic diagram of the parking state of the hub motor parking mechanism of the present utility model;

[0033] Figure 5 This is a schematic diagram of the parking preparation release state of the in-wheel motor parking mechanism of the present utility model. Specific embodiments

[0034] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] Taking a passenger car of about 2t as an example, when parking on a slope of 40%, according to industry standards, the parking handle of the cable parking mechanism should not be greater than 400N. At this time, the transmission ratios of both the parking mechanism and the parking handle are above 6. The lever mechanism occupies a large space and is difficult to arrange.

[0036] As Figures 1-5 shown, the in-wheel motor parking mechanism of the present utility model changes the parking torque generated by traditional friction to the way of providing parking torque by the limit of the parking top block. The structure is simpler and the formation of the parking torque is easier. It specifically includes a base 1, a locking disc 2, a claw 3 and a linear push-pull mechanism 4.

[0037] The base 1 is fixed on the side of the in-wheel motor that does not rotate with the wheel, that is, fixed on the housing of the in-wheel motor that does not rotate with the wheel. The fixing method can be multi-bolt fixing or welding, etc. The base 1 is used as the main body shell of this parking mechanism. During parking, it needs to bear a large thrust, and materials with better mechanical stability, such as aluminum alloy, need to be selected. The base 1 is integrally arranged in a box shape, and the side far from the in-wheel motor is open. It should be noted that the base 1 is arranged centered on the axis of the in-wheel motor, and the width is smaller than the diameter of the in-wheel motor.

[0038] The locking disc 2 is rotatably arranged in the base 1 and is fixed to the rotating shaft of the in-wheel motor, that is, the locking disc 2 is fixed to the rotor part of the in-wheel motor and rotates with the rotor of the in-wheel motor. When parking, by locking the locking disc 2, the rotation of the wheel can be blocked, thus completing the parking action. The locking disc 2 includes a convex block 21, and the convex block 21 deviates from the axis of the rotating shaft of the in-wheel motor. By locking the convex block 21, the locking of the rotor of the in-wheel motor can be realized. At the same time, since the convex block 21 deviates from the axis of the rotor of the in-wheel motor, a smaller locking force can be used to realize the locking of the rotor of the in-wheel motor.

[0039] There are two claws 3, and the opposite ends are hinged in the base 1. The claws 3 selectively resist the protrusion 21. Two hinged seats are also provided in the base 1, which are respectively connected to the two claws 3. The claws 3 are set on the hinged seats through pins, and the free ends thereof can move toward the locking disk 2 or away from the locking disk. During parking, the two claws 3 can be moved to the two sides of the protrusion 21 respectively to prevent it from rotating in the forward and reverse directions to achieve parking. In addition, the two claws 3 are preferably arranged in left and right mirror images, so that when in action, the action amplitude and force performance are the same, and better mechanical stability is achieved.

[0040] The linear push-pull mechanism 4 is fixed in the base 1 and has a linear movable end 41. The linear movable end 41 can move along the diameter direction of the hub motor shaft and is flexibly connected to the two claws 3. The linear movable end 41 moves so that the two claws 3 have a tendency to approach or move away from the locking plate 2 at the same time. Specifically, after the two claws 3 are set to be left and right mirror images, there is a mirror axis, and the mirror axis is perpendicular to and intersects with the axis of the locking plate 2. The linear movable end 41 preferably moves linearly along the mirror axis, so that during the movement, the push-pull forces on the two claws 3 are the same, avoiding excessive force on a single claw. At the same time, since the claw 3 and the linear movable end 41 are flexibly transmitted, when the claw 3 abuts against the protrusion 21, the claw 3 on one side cannot move, and the linear movable end 41 cannot drive the claw 3 to leave the locking plate 2, thereby avoiding the vehicle from stopping on a slope and sliding down when the parking is released.

[0041] That is to say, when one of the two claws 3 abuts against the protrusion 21, the claw 3 will prevent the protrusion 21 from moving toward the abutting side, so that the locking plate 2 can only rotate in one direction. At the same time, the linear movable end 41 can push the other claw 3 away from or close to the locking plate 2, thereby realizing the parking and pre-parking release actions after one-way locking.

[0042] In addition, since the linear push-pull mechanism 4 does not need to provide the main parking force, an electric push rod can be directly selected, and the thrust requirement is only 30-40N, which is much smaller than the parking rod pull force of 400N or the EPB thrust. The linear movable end 41 is the output end of the electric push rod.

[0043] In this embodiment, in order to achieve the synchronous flexible transmission between the linear moving end 41 and the two jaws 3, a flexible connection assembly 5 is further provided. The flexible connection assembly 5 is fixed to the linear moving end 41 and is in transmission connection with the two jaws 3. The flexible connection assembly 5 applies a pushing and pulling force to the jaws 3 through elastic deformation, so that after the jaws 3 are locked with the convex block 21, they can still deform without driving the jaws 3 to reset. Similarly, the flexible connection assembly 5 can apply a force to the jaws 3 to leave the locking disc 2, so that they have a tendency to leave the locking disc 2. When the jaws 3 leave the convex block 21, they can move away from the locking disc 2 under this tendency, thereby releasing the parking brake.

[0044] Specifically, the flexible connection assembly 5 includes two first elastic members 51. One ends of the two first elastic members 51 are both arranged on the linear moving end 41, and the other ends are respectively arranged on the two jaws 3. Through the elastic deformation of the first elastic members 51, the flexible connection between the linear moving end 41 and the jaws 3 is realized. In this embodiment, the first elastic member 51 is preferably a spring. When the linear moving end 41 is pushed upward, a tendency to leave the locking disc 2 is applied to the two jaws 3 through the first elastic members 51. If there is no obstruction to the jaws 3, it will drive the jaws 3 to move upward and leave the locking disc 2. If a single jaw 3 is obstructed, this jaw 3 will remain in contact with the convex block 21, but the movement tendency applied to this jaw 3 remains unchanged until the convex block 21 rotates away from this jaw 3, and this jaw 3 will rotate away from the locking disc 2 under this tendency to complete the release of the parking brake.

[0045] To enable the first elastic member 51 to adapt to the relative rotation between the jaw 3 and the linear moving end 41, the flexible connection assembly 5 further includes a connection seat 52 and two support seats 53. The connection seat 52 is fixed to the linear moving end 41. The two support seats 53 are respectively hinged at both ends of the connection seat 52 and are respectively fixed to the two first elastic members 51. When there is a relative displacement between the jaw 3 and the linear moving end 41, due to the relatively large offset angle, the rotation of the support seat 53 is used to compensate for this angle, reducing the deformation of the first elastic member 51 in other directions except the length direction and improving the telescopic stability of the first elastic member 51.

[0046] The connection seat 52 is integrally arranged in an H shape, and the two support seats 53 are respectively arranged in the notch openings at both ends and are hinged to the connection seat 52 through a pin shaft.

[0047] In this embodiment, when the jaw 3 has not completely left the locking disc 2, there may be a situation where the convex block 21 contacts the side surface of the jaw 3 during rotation. Therefore, an arc-shaped groove 31 is provided on the side of the jaw 3 close to the locking disc 2, so that the convex block 21 can avoid the jaw 3 through the arc-shaped groove 31, greatly reducing the contact probability and avoiding mechanical collision and wear.

[0048] In addition, during the parking process, both claws 3 contact the locking plate 2, but the protrusion 21 is not between the two claws 3. The protrusion 21 can be rotated, and the protrusion 21 lifts one side of the claw 3 through the arc groove 31, so that the protrusion 21 rotates between the two claws 3 to achieve parking. During the whole process, although the hub motor shaft still needs to rotate by a certain angle to be locked after completing the parking action at different parking moments, due to the transmission ratio of about 8 to 12 between the shaft and the wheel, the rotation amount of the wheel during the actual parking process is extremely small, with a maximum of about 2°, which does not affect the actual parking effect.

[0049] In order to protect the internal components of the base 1, a cover 6 is also provided, and the cover 6 is fixed on the opening side of the base 1. Specifically, the cover 6 can be fixed to the base 1 by screws, so as to seal the interior of the base 1 to prevent dust from entering the base 1, so that the internal and external environments of the base 1 are isolated. The shape of the cover 6 is preferably consistent with the opening shape of the base 1, and the material is the same as that of the base 1. The set cover 6 can be disassembled to maintain, repair or replace the internal structure of the base 1.

[0050] In this embodiment, the locking plate 2 also includes a connecting shaft 22 and a plate body 23. One end of the connecting shaft 22 extends to the outside of the base 1 and is fixed coaxially with the rotating shaft of the hub motor. The connecting shaft 22 is rotatably set on the base 1 through a bearing. The plate body 23 is fixed on one end of the connecting shaft 22 located inside the base 1. The protrusion 21 is fixed on the outside of the plate body 23. Specifically, a bearing is embedded in the base 1, and the connecting shaft 22 passes through the base 1 through the bearing. In addition, the connecting shaft 22 can be set as a spline shaft, and a corresponding keyway is set on the hub motor rotor. The connecting shaft 22 is inserted into the keyway for transmission. At the same time, the base 1 is fixed to the hub motor, so that the connecting shaft 22 and the hub motor rotor cannot be separated.

[0051] As a preferred embodiment, the number of the protrusions 21 is multiple, and they are distributed in a ring on the disk body 23 with the connecting shaft 22 as the center, so that the connecting shaft 22 can be locked by one of the protrusions 21 during rotation, thereby minimizing the required rotation angle of the connecting shaft 22 when locking. In this embodiment, four protrusions 21 are used for setting. Too many protrusions will cause the claw 3 to be unable to be set to a larger size, affecting the stability of parking.

[0052] In this embodiment, two second elastic members 7 are further provided. One ends of the two second elastic members 7 are correspondingly arranged on the two chucks 3, and the other ends are both arranged on the base 1. The second elastic members 7 can be used to compensate for the pushing and pulling force of the first elastic member 51, improve the service life of the flexible transmission part, and at the same time accelerate the reset speed of the chuck 3 after the bump 21 is separated from the chuck 3. The second elastic member 7 can be selected as a spring like the first elastic member 51. After selecting the spring, it needs to be hinged to the inner wall of the base 1 to adapt to the angle when the chuck 3 is offset.

[0053] In addition, in this embodiment, for this parking mechanism, three working states are set, namely the parking state, the parking preparation release state, and the parking release state.

[0054] As Figure 4 shown, in the parking state, the linear moving end 41 of the linear push-pull mechanism 4 contracts to the shortest state. At this time, the first elastic member 51 is compressed, and the two chucks 3 rotate downward and contact the locking disk 2. When the bump 21 on the locking disk 2 is in the middle of the two chucks 3, the locking disk 2 rotates clockwise or counterclockwise to make the bump 21 abut and engage with one of the two chucks 3, thereby locking the rotating shaft and making it unable to continue rotating. When the two chucks 3 are in the middle of two adjacent bumps 21, the rotating shaft rotates clockwise or counterclockwise, so that the bump 21 first lifts one of the two chucks 3. After passing over the chuck 3, the chuck 3 rebounds to its original position under the push and pull of the first elastic member 51 and the second elastic member 7, and the rotating shaft continues to rotate until the bump 21 fits one of the two chucks 3, and then the parking can be completed. During the whole process, although the rotating shaft still has a certain angular rotation to lock after completing the parking action at different parking moments, due to the transmission ratio of about 8-12 between the rotating shaft and the wheel, the rotation amount of the wheel during the actual parking process is extremely small, about 2°, which does not affect the actual parking effect. In addition, in this state, the parking state can be switched to the parking preparation release state or the parking release state.

[0055] As Figure 5 shown, in the parking preparation release state, due to the parking state, one of the two chucks 3 abuts against the bump 21. Therefore, during the movement of the linear moving end 41, only the other chuck 3 can be pushed away, so that the other chuck 3 leaves the locking disk 2. During this process, since only one chuck 3 resets, the locking disk 2 can only rotate towards the reset chuck 3 and cannot rotate towards the side where the bump 21 abuts against the chuck 3. The parking preparation release state is mainly applicable to special scenarios such as starting on a slope. After the driver releases the foot brake, the vehicle will not slide down, providing the driver with the time to step on the accelerator stroke required to adapt to this slope. In addition, in this state, the parking preparation release state can be switched to the parking state or the parking release state.

[0056] AsFigure 3 As shown, when in the parking release state, both of the two pawls 3 leave the locking disc 2. The parking release state can be switched to the parking state. It should be noted that the parking release state cannot be directly switched to the pre-parking release state, and can only be converted through the parking state as an intermediate state.

[0057] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hub motor parking mechanism, characterized in that It comprises a base (1), a locking plate (2), a clamping claw (3) and a linear push-pull mechanism (4), wherein: The base (1) is fixed to the side of the hub motor that does not rotate with the wheel; The locking plate (2) is rotatably arranged in the base (1) and is fixed to the rotating shaft of the wheel hub motor. The locking plate (2) comprises a protrusion (21), and the protrusion (21) deviates from the axis of the rotating shaft of the wheel hub motor. There are two claws (3) arranged opposite to each other, and the ends of the two claws (3) facing away from each other are both hinged to the base (1), and the protrusion (21) selectively abuts against one of the two claws (3); The linear push-pull mechanism (4) is fixed in the base (1) and has a linear movable end (41). The linear movable end (41) can move along the diameter direction of the hub motor shaft and is flexibly connected to the two claws (3). The linear movable end (41) is used to push at least one of the two claws (3) to move closer to or away from the locking plate (2). When one of the two claws (3) abuts against the protrusion (21), the claw (3) blocks the protrusion (21) from moving toward the abutting side, and the linear movable end (41) selectively pushes the other claw (3) away from the locking plate (2).

2. The hub motor parking mechanism according to claim 1, characterized in that, It also comprises a flexible connection component (5), wherein the flexible connection component (5) is fixed on the linear movable end (41) and is drivingly connected to the two claws (3).

3. The hub motor parking mechanism according to claim 2, wherein, The flexible connection assembly (5) comprises two first elastic members (51), one end of each of the two first elastic members (51) is arranged on the linear movable end (41), and the other end is respectively arranged on two claws (3).

4. The hub motor parking mechanism according to claim 3, characterized in that, The flexible connection assembly (5) further comprises a connection seat (52) and two supports (53), wherein: The connecting seat (52) is fixed on the linear movable end (41); The two supports (53) are respectively hinged at two ends of the connecting seat (52) and are respectively fixed to the two first elastic members (51).

5. The wheel hub motor parking mechanism according to claim 1, characterized in that, An arc-shaped groove (31) is formed on one side of the claw (3) close to the locking plate (2).

6. The hub motor parking mechanism according to claim 1, characterized in that, It also comprises a sealing cover (6), one side of the base (1) is arranged to be open, and the sealing cover (6) is fixed to the open side of the base (1) and is used to seal the opening of the base (1).

7. The wheel hub motor parking mechanism according to claim 1, characterized in that, The locking disk (2) further comprises a connecting shaft (22) and a disk body (23), wherein: One end of the connecting shaft (22) extends to the outside of the base (1) and is fixed coaxially with the rotating shaft of the hub motor; the connecting shaft (22) is rotatably arranged on the base (1) via a bearing; The disc body (23) is fixed on one end of the connecting shaft (22) located inside the base (1), and the protrusion (21) is fixed on the outside of the disc body (23).

8. The wheel hub motor parking mechanism according to claim 7, characterized in that, The number of the protrusions (21) is plural and they are distributed on the disk body (23) in a ring shape with the connecting shaft (22) as the center.

9. The wheel hub motor parking mechanism according to claim 1, wherein, It also comprises two second elastic members (7), one end of each of the two second elastic members (7) being arranged on the two claws (3) respectively, and the other end of each of the two second elastic members (7) being arranged on the base (1).

10. The hub motor parking mechanism according to claim 1, characterized in that: The two clamping claws (3) are mirror images of each other.

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