Electronic parking drum brake assembly that pushes the L-shaped pull arm to achieve parking function

Abstract

The present invention discloses an electronic parking drum brake assembly that pushes an L-shaped pull arm to realize a parking function. The top of the L-shaped parking pull arm is hinged to the brake tendon, and a long strip through slot is provided on the brake bottom plate. The lower part of the L-shaped parking pull arm is bent 90 degrees and then extends horizontally to the back of the brake bottom plate through the long strip through slot; the gear box housing is fixedly installed on the mounting bracket through a hexagon socket head bolt, and the motor inside the motor housing is connected and driven by the gear transmission structure inside the gear box housing and the screw rod, driving the screw rod to move axially; the end of the screw rod extending out of the gear box housing is hinged to the horizontal end of the side portion of the tail of the L-shaped parking pull arm after passing through the brake bottom plate. The present invention can complete the electronic parking of the vehicle by pushing the L-shaped parking pull arm, and at the same time, perform emergency braking operation in the case of failure of the service brake, and has an anti-lock function.

Description

Technical Field

[0001] The invention relates to automobile brake control technology, in particular to an electronic parking drum brake assembly which pushes an L-shaped pulling arm to realize a parking function. Background Art

[0002] Automotive electronic parking is widely used in various models and has gradually become a standard feature. Actuators are generally divided into two types: dual-cable type and integrated type. In the current industry, there are dual-cable electronic parking assemblies that act on the caliper assembly and the drum brake assembly, and the integrated electronic parking assemblies basically act on the caliper assembly. For models with large full load weight, more drum brakes are needed. Now new energy electric vehicles are a trend. It is a common design for electric vehicles to be equipped with drum brakes. It will also be a trend for integrated electronic parking assemblies to act on drum brakes. Conventional integrated electronic parking drum brakes need to pull the pull wire to drive the pull arm to achieve electronic parking. The pull wire connection has a certain efficiency loss. Summary of the invention

[0003] In order to solve the problems existing in the background technology, the present invention provides an electronic parking drum brake assembly that pushes an L-shaped pull arm to realize the parking function, which can be applied to all vehicle models and can complete the electronic parking of the vehicle by pushing the L-shaped parking pull arm. At the same time, in the case of service brake failure, emergency braking operation is performed, and anti-lock function is also provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention comprises a leading shoe assembly, a trailing shoe assembly and a brake base plate, wherein the trailing shoe assembly comprises a trailing brake shoe tendon, wherein the middle portion of the trailing brake shoe tendon is hingedly connected to the brake base plate through a compression spring, a compression spring pull rod and a compression spring seat, and further comprises a drum brake braking device and a power actuator; the drum brake braking device comprises an L-shaped parking arm and a mounting bracket, wherein the top end of one side edge of the L-shaped parking arm is hingedly connected to the side of the brake shoe tendon facing the brake base plate, and a long strip through groove is provided on the brake base plate, and the other side edge of the L-shaped parking arm is bent 90 degrees at the lower portion and then passes through the long strip through groove for water It extends horizontally to the back side of the brake base plate, and the mounting bracket is welded to the back side of the brake base plate; the power actuator includes a gear box housing, a motor housing and a screw, the gear box housing is fixedly mounted on the mounting bracket by a hexagonal cylindrical head bolt, the motor housing is mounted on the gear box housing, the motor inside the motor housing is connected and driven by the gear transmission structure inside the gear box housing and the screw, driving the screw to move axially, and the screw is parallel to the long strip through groove; the end of the screw extending out of the gear box housing is hinged to the horizontal end of the side of the tail of the L-shaped parking arm after passing through the brake base plate.

[0006] The top end of one side edge of the L-shaped parking arm is hinged to the brake tendon through an arm pin.

[0007] The end of the screw is provided with a horizontal slot, and the horizontal end of the side portion of the tail of the L-shaped parking arm after passing through the brake base plate is embedded in the slot, and a pin shaft passes through the slot wall and the end of the side portion of the L-shaped parking arm after passing through the brake base plate to form a hinge, ensuring that the Z-shaped parking arm moves synchronously with the screw as the motor signal is released.

[0008] Pin holes are arranged on both sides of the screw rod slot for installing pin shafts.

[0009] A plastic bracket is installed on the back side of the brake bottom plate above the installation bracket, and the plastic bracket is supported and installed on the motor housing.

[0010] The side edge of the L-shaped parking arm after passing through the back of the brake base plate is used as a bending portion, and two protruding structures are also provided on the side of the bending portion. The bending portion between the two protruding structures is covered with a pulling arm shield, the inner circle of the pulling arm shield is covered with the bending portion, and the outer circle is covered with the long strip through groove of the brake base plate. A pin is provided at the end of the bending portion, and the matching surface with the screw head is designed to be arc-shaped, so as to ensure that the screw head and the L-shaped parking arm are always in contact during the movement of the L-shaped parking arm.

[0011] The pulling arm guard is made of rubber.

[0012] The present invention can adjust the force of the screw rod on the L-shaped parking arm through the forward and reverse rotation of the motor, so as to achieve the anti-lock function during emergency braking.

[0013] The working principle of the present invention is that the motor provides power torque, the planetary gear reduces speed and increases torque, the bevel gear turns, and the screw sleeve converts the torque into thrust that directly acts on the L-shaped parking arm of the drum brake to complete the parking braking process; when the parking release signal is obtained, the motor reverses to release the parking force of the screw on the L-shaped parking arm of the drum brake, and the vehicle parking state is released.

[0014] The beneficial effects of the present invention are:

[0015] The invention can realize electronic parking of a vehicle by directly pushing an L-shaped parking arm through a screw rod of a power actuator. In the case of service brake failure, an emergency braking operation is performed, and the invention has an anti-lock function and is applied to all vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front elevation view of the electronic parking drum brake assembly involved in the present invention;

[0017] Figure 2 is a rear exploded view of the electronic parking drum brake assembly involved in the present invention;

[0018] Figure 3 yes Figure 1 A front elevation view from the front of the shoe assembly;

[0019] Figure 4 yes Figure 3 Left view of

[0020] Figure 5 for Figure 4 The left side view, that is, the front view from the back of the shoe assembly;

[0021] Figure 6 yes Figure 4 AA section view.

[0022] Figure 7 It is a three-dimensional view of the pull arm guard.

[0023] In the figure: 1 drum brake braking device, 1.1 shoe with L-shaped parking arm assembly, 1.1.1 L-shaped parking arm, 1.1.2 open washer, 1.1.3 arm pin, 1.1.4 brake shoe tendon, 1.2 brake base plate, 1.3 mounting bracket, 1.4 hexagon socket cylindrical head bolt, 1.5 plastic bracket, 1.6 pin shaft, 1.7 locking pin, 1.8 arm shield, 1.9 leading shoe assembly, 2 power actuator, 2.1 gear box housing, 2.2 screw, 2.3 motor housing. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods, installation and use processes.

[0025] like Figure 1 As shown, it includes a leading shoe assembly 1.9, a trailing shoe assembly and a brake base plate 1.2. The trailing shoe assembly includes a trailing brake shoe tendon 1.1.4. The middle part of the brake shoe tendon 1.1.4 is hinged to the brake base plate 1.2 through a shaft and a compression spring, a compression spring pull rod, and a compression spring seat. The electronic parking drum brake assembly that pushes the L-shaped pull arm to realize the parking function also includes a drum brake braking device 1 and a power actuator 2.

[0026] like Figure 2As shown, the drum brake device 1 includes an L-shaped parking arm 1.1.1 of the L-shaped parking arm assembly 1.1, and a mounting bracket 1.3. The top of one side edge of the L-shaped parking arm 1.1.1 is hinged to the side of the brake tendon 1.1.4 facing the brake base plate 1.2. The L-shaped parking arm 1.1.1 and the brake tendon 1.1.4 move synchronously together, that is, the back of the brake tendon 1.1.4 and the brake base plate 1.2 are provided with a long strip through groove, and the other side edge of the L-shaped parking arm 1.1.1 is bent 90 degrees at the bottom. After passing through the long strip through slot, it extends horizontally to the back of the brake base plate 1.2. The L-shaped parking arm 1.1.1 passes through the brake base plate 1.2 and is connected to the screw 2.2 of the power actuator 2. The strip direction of the long strip through slot is arranged along the rotation tangent direction of the L-shaped parking arm 1.1.1 around the hinge point. The mounting bracket 1.3 is welded on the back of the brake base plate 1.2. The specific mounting bracket 1.3 is provided with reinforcing ribs and is L-shaped. One side is fixed to the back of the brake base plate 1.2, and the other side is arranged toward the motor housing 2.3. A plastic bracket 1.5 is installed on the back of the brake base plate 1.2 above the mounting bracket 1.3. The plastic bracket 1.5 is supported and installed on the motor housing 2.3 to help fix the position of the motor housing 2.3.

[0027] like Figure 2 As shown, the power actuator 2 includes a gearbox housing 2.1, a motor housing 2.3 and a screw 2.2. The gearbox housing 2.1 is fixedly mounted on the mounting bracket 1.3 via a hexagon socket head bolt 1.4. The motor housing 2.3 is mounted on the gearbox housing 2.1. One end of the screw 2.2 is mounted in the gearbox housing 2.1. The motor inside the motor housing 2.3 is connected and transmitted with the screw 2.2 via the gear transmission structure inside the gearbox housing 2.1, driving the screw 2.2 to move axially. The screw 2.2 is parallel to the long strip through groove. The end of the screw 2.2 extending out of the gearbox housing 2.1 is hinged to the horizontal end of the side of the tail of the L-shaped parking arm 1.1.1 after passing through the brake base plate 1.2.

[0028] A horizontal slot is provided at the end of the screw rod 2.2, and the horizontal end of the side portion of the tail of the L-shaped parking arm 1.1.1 passing through the brake base plate 1.2 is embedded in the slot, and a pin shaft 1.6 and a locking pin 1.7 pass through the slot wall and the end of the side portion of the L-shaped parking arm 1.1.1 passing through the brake base plate 1.2 to form a hinge.

[0029] There are pin holes on both sides of the screw 2.2 slot for installing the pin shaft 1.6 to ensure that the lower part of the L-shaped parking arm 1.1.1 moves synchronously with the screw 2.2 when the parking signal is released. The pin shaft 1.6 is inserted into the pin holes of the screw 2.2 and the L-shaped parking arm 1.1.1 in turn, and locked with a lock pin 1.7 to ensure that the screw 2.2 and the L-shaped parking arm 1.1.1 always maintain contact during the parking brake process.

[0030] like Figure 3-Figure 4 As shown, the top of one side edge of the L-shaped parking arm 1.1.1 is hinged to the brake shoe tendon 1.1.4 through the arm pin 1.1.3 and the open washer 1.1.2, and the open washer 1.1.2 limits the arm pin 1.1.3. The shoe belt L-shaped parking arm assembly 1.1 is mainly composed of the L-shaped parking arm 1.1.1, the brake shoe tendon 1.1.4, the arm pin 1.1.3 and the open washer 1.1.2.

[0031] like Figure 6 As shown, the side portion of the L-shaped parking arm 1.1.1 after passing through the back side of the brake base plate 1.2 serves as a bending portion B. Two protruding structures A are also provided on the side of the bending portion B. The protruding structures A are used to install and fix the arm guard 1.8. The bending portion B between the two protruding structures A is sheathed with the arm guard 1.8. The arm guard 1.8 is provided with a through groove for the bending portion B to pass through. The inner ring of the arm guard 1.8 is sheathed on the bending portion B, and the outer ring is sheathed on the long strip through groove of the brake base plate 1.2.

[0032] Thus, the L-shaped parking arm 1.1.1 is designed to be in an "L" shape. Figure 4 As shown, the bending portion B is provided with a pin hole, and the mating surface with the head of the screw rod 2.2 is designed to be arc-shaped, to ensure that the head of the screw rod 2.2 and the L-shaped parking arm are always in contact during the movement of the L-shaped parking arm 1.1.1; the side portion of the L-shaped parking arm 1.1.1 after passing through the back side of the brake base plate 1.2 and the side portion of the L-shaped parking arm 1.1.1 fixed to the brake tendon 1.1.4 are arranged perpendicularly.

[0033] The implementation process of the present invention is:

[0034] When the parking signal is received, the motor inside the motor housing 2.3 provides power torque, and the gear transmission structure inside the gear box housing 2.1 can be a planetary gear plus bevel gear transmission structure, which converts the torque into thrust and directly acts on the L-shaped parking arm 1.1.1 through the screw 2.2, pushing and moving the L-shaped parking arm 1.1.1. The L-shaped parking arm 1.1.1 rotates around the hinge point to push the self-adjusting mechanism assembly of the drum brake itself to drive the leading shoe assembly 1.9 and the tendons of the following shoe assembly to open, thereby driving the friction plate on the shoe to contact the inner surface of the brake drum, completing the parking braking process of the drum brake.

[0035] When the parking release signal is received, the motor inside the motor housing 2.3 reverses, releasing the force of the screw 2.2 on the L-shaped parking arm 1.1.1, and pulling the L-shaped parking arm 1.1.1 back to its original position. The L-shaped parking arm 1.1.1 rotates back around the hinge point, and the shoe return spring drives the leading shoe assembly 1.9 and the shoe tendon of the following shoe assembly to return, so that the friction plate on the shoe is not in contact with the inner surface of the brake drum, and the vehicle parking state is released.

Claims

1. An electronic parking drum brake assembly for pushing an L-shaped pulling arm to realize a parking function, comprising a leading shoe assembly (1.9), a trailing shoe assembly and a brake base plate (1.2), wherein the trailing shoe assembly comprises a brake shoe tendon (1.1.4), wherein the middle portion of the brake shoe tendon (1.1.4) is hingedly fixed to the brake base plate (1.2), and characterized in that: It also includes a drum brake device (1) and a power actuator (2); the drum brake device (1) includes an L-shaped parking arm (1.1.1) and a mounting bracket (1.3); the top end of one side edge of the L-shaped parking arm (1.1.1) is hinged to the side of the brake tendon (1.1.4) facing the brake base plate (1.2); a long strip through groove is provided on the brake base plate (1.2); the other side edge of the L-shaped parking arm (1.1.1) is bent 90 degrees at the bottom and then extends horizontally through the long strip through groove to the back of the brake base plate (1.2); the mounting bracket (1.3) is welded to the back of the brake base plate (1.2); the power actuator (2) includes a gear box The gearbox housing (2.1), the motor housing (2.3) and the screw rod (2.2) are connected to the gearbox housing (2.1), the motor housing (2.3) is connected to the screw rod (2.2) through the gear transmission structure inside the gearbox housing (2.1), and the screw rod (2.2) is driven to move axially. The screw rod (2.2) is parallel to the long strip through groove; the end of the screw rod (2.2) extending out of the gearbox housing (2.1) is hinged to the horizontal end of the side of the rear end of the L-shaped parking arm (1.1.1) after passing through the brake base plate (1.2).

2. The electronic parking drum brake assembly for realizing the parking function by pushing the L-shaped pull arm according to claim 1, characterized in that: The top end of one side edge of the L-shaped parking arm (1.1.1) is hinged to the brake tendon (1.1.4) via an arm pin (1.1.3).

3. The electronic parking drum brake assembly for realizing parking function by pushing the L-shaped pulling arm according to claim 1, characterized in that: The end of the screw rod (2.2) is provided with a horizontal slot, and the horizontal end of the side portion of the rear end of the L-shaped parking arm (1.1.1) passing through the brake base plate (1.2) is embedded in the slot, and a pin shaft (1.6) passes through the slot wall and the end of the side portion of the L-shaped parking arm (1.1.1) passing through the brake base plate (1.2) to form a hinge.

4. The electronic parking drum brake assembly for realizing the parking function by pushing the L-shaped pull arm according to claim 1, characterized in that: Pin holes are provided on both sides of the screw rod (2.2) slot for mounting a pin shaft (1.6).

5. The electronic parking drum brake assembly for realizing the parking function by pushing the L-shaped pull arm according to claim 1, characterized in that: A plastic bracket (1.5) is installed on the back side of the brake base plate (1.2) above the mounting bracket (1.3), and the plastic bracket (1.5) is supported and installed on the motor housing (2.3).

6. The electronic parking drum brake assembly for realizing the parking function by pushing the L-shaped pulling arm according to claim 1, characterized in that: The side portion of the L-shaped parking arm (1.1.1) after passing through the back side of the brake base plate (1.2) serves as a bending portion (B), and two protruding structures are also provided on the side of the bending portion (B). The bending portion (B) between the two protruding structures is sheathed with an arm shield (1.8), the inner ring of the arm shield (1.8) is sheathed on the bending portion (B), and the outer ring is sheathed on the long strip through groove of the brake base plate (1.2).

7. The electronic parking drum brake assembly for realizing the parking function by pushing the L-shaped pulling arm according to claim 6, characterized in that: The pull arm guard (1.8) is made of rubber.

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