An electronic mechanical execution unit and a brake assembly

Abstract

The utility model discloses an electronic mechanical execution unit and brake assembly, including a mounting plate, a motor with an electromagnetic brake, an actuator and a reducer, wherein the motor and the reducer are respectively mounted on both sides of the mounting plate; the actuator includes a large lead screw, and one end of the large lead screw is provided with a hinged ear; the reducer includes a reducer housing, a gear set and a nut, wherein: the reducer housing includes a front cover plate and a rear box body; the gear set includes a small gear and a large gear that are mutually meshed and arranged in the reducer housing, the small gear is connected to the output shaft of the motor, the large gear is connected to the nut flange at one end of the nut through a bolt, and both ends of the nut are supported in the reducer housing through bearings, and the nut is matched with the large lead screw thread. The utility model can be used in new energy vehicles, and the braking force is provided by the motor instead of the electric push rod, and the braking precision is high, which is conducive to energy recovery and the realization of functions such as ABS and ESP, and is conducive to the realization of high-order automatic driving.

Description

Technical Field

[0001] The utility model belongs to the technical field of braking, and in particular relates to an electronic mechanical execution unit and a braking component. Background Art

[0002] The known publication number is CN204437131U, and the name is: an electric push rod drum brake structure for wind power generation, including a drum brake, an electric push rod connected to the drum brake through an intermediate connector, and the electric push rod is arranged on a support. The drum brake is composed of a brake drum, a brake shoe, a camshaft and an adjustment arm. Two brake shoes are arranged inside the brake drum, and the two brake shoes are connected by a camshaft, and the camshaft is connected to the adjustment arm. The intermediate connector is composed of a joint, a compensation spring and a guide rod. The joint is arranged on the shaft of the guide rod, and a compensation spring is arranged between the joint and the guide rod; the joint is connected to the adjustment arm; the guide rod is arranged on the shaft of the electric push rod. However, the brake structure uses an electric push rod to provide braking force, and the braking accuracy is low and the response speed is slow. In addition, if the electric push rod is used in new energy vehicles, it will be unfavorable for real-time adjustment of braking force and brake distribution, energy recovery, and realization of ABS, ESP and other functions. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an electronic mechanical execution unit and a brake assembly.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] An electromechanical actuator unit comprises a mounting plate, a motor with an electromagnetic brake, an actuator and a reducer, wherein the motor and the reducer are respectively mounted on two sides of the mounting plate;

[0006] The actuator comprises a large lead screw, one end of which is provided with a hinged ear;

[0007] The reducer comprises a reducer housing, a gear set and a nut, wherein:

[0008] The reducer housing includes a front cover plate and a rear housing;

[0009] The gear set includes a small gear and a large gear that are meshed with each other and are arranged in the reducer housing. The small gear is connected to the output shaft of the motor, and the large gear is connected to the nut flange at one end of the nut through a bolt. Both ends of the nut are supported in the reducer housing by bearings respectively, and the nut cooperates with the large lead screw thread.

[0010] Furthermore, a reset mechanism for resetting the drive nut is also provided in the reducer housing, and the reset mechanism includes a reset spring, which is arranged on one side of the large gear. The free end of the reset spring is connected to the large gear through a locating pin, and the fixed end of the reset spring is connected to the rear housing of the reducer through a locating pin.

[0011] Furthermore, one end of the nut is connected to the rear housing of the reducer through a tapered roller bearing, and the other end is connected to the front cover plate through a thrust roller bearing.

[0012] Furthermore, the output shaft of the motor is mounted with a spline sleeve via a flat key, the splines of the spline sleeve are fixedly connected to the inner ring of the adapter bearing mounted on the front cover plate, and the pinion is mounted on the splines of the spline sleeve.

[0013] Furthermore, the large-lead screw comprises a polished rod section and a threaded section, one end of the polished rod section is connected to the threaded section, and the nut cooperates with the threaded section.

[0014] Furthermore, a first sealing sleeve and a second sealing sleeve are respectively installed on both sides of the reducer housing by bolts, the first sealing sleeve is connected to the front cover plate, the second sealing sleeve is connected to the rear housing, and the bare rod section of the large lead screw is sealed and extends out of the first sealing sleeve.

[0015] Furthermore, a sealing ring installation groove is provided at the front end of the first sealing sleeve, and a sealing ring matching with the polished rod section is provided in the sealing ring installation groove.

[0016] Furthermore, an anti-rotation mechanism is provided between the first sealing sleeve and the polished rod section, and the anti-rotation mechanism includes a disc and a linear track;

[0017] The annular inner wall of the first sealing sleeve is provided with two radially symmetrical linear tracks extending in the axial direction, the polished rod section is provided with a disc, and the radial direction of the disc is provided with a track groove matching with the linear tracks.

[0018] Furthermore, the disc and the polished rod section are manufactured and formed as one piece.

[0019] The utility model also discloses a brake assembly, which comprises the above-mentioned electronic mechanical execution unit. Beneficial Effects

[0020] 1. The utility model can be used in new energy vehicles, and the braking force is provided by the motor instead of the electric push rod, with high braking accuracy and fast response speed.

[0021] 2. The utility model sets a reset mechanism in the reducer housing without increasing the spatial size of the reducer housing, so that when the motor is reversed, a certain restoring force can be generated more quickly, thereby improving the response speed of the reciprocating adjustment of the braking force, and is more conducive to realizing the high-frequency positive and negative variable adjustment of the braking force required by functions such as ABS and ESP, and is conducive to realizing high-order autonomous driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the brake structure of the drum brake of the utility model;

[0023] Figure 2 for Figure 1 A top view of

[0024] Figure 3 for Figure 1 Rear view of

[0025] Figure 4 for Figure 1 Axonometric view of

[0026] Figure 5 It is a cross-sectional view of the electronic mechanical execution unit in the utility model;

[0027] Figure 6 for Figure 5 A partial isometric view of

[0028] Figure 7 is a schematic diagram of the installation of the first sealing sleeve;

[0029] Figure 8 is a schematic diagram of the installation of the second sealing sleeve;

[0030] Fig. 9 This is a schematic diagram of the installation of the return coil spring;

[0031] In the figure: drum brake 1, adjustment arm 2, electronic mechanical actuator 3, brake shoe 11, camshaft 12, cam 13, hinge ear 31, hinge 32, motor 33, gear set 34, nut 35, large lead screw 36, mounting plate 37, disc 38, reducer housing 39, spline sleeve 40, return coil spring 41, sealing sleeve 42, sealing ring 43, linear rail 44, tapered roller bearing 45, thrust roller bearing 46, electromagnetic brake 331, pinion 341, large gear 342, front cover plate 391, rear box body 392, adapter bearing 401, first sealing sleeve 421, second sealing sleeve 422. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0033] Example 1: Figures 5 to 9As shown, an electronic mechanical actuator unit includes a mounting plate 37, a motor 33 with an electromagnetic brake 331, an actuator and a reducer. The electromagnetic brake 331 is located at the end of the motor 33 and plays a parking / locking function. The motor 33 and the reducer are respectively installed on both sides of the mounting plate 37 by bolts; the actuator includes a large lead screw 36, one end of the large lead screw 36 is provided with a hinge ear 31, and the output shaft of the motor 33 is arranged in parallel with the large lead screw 36; the reducer includes a reducer housing 39, a gear set 34 and a nut 35, wherein: the reducer housing 39 includes a front cover plate 39 1 and rear housing 392; the gear set 34 includes a pinion 341 and a large gear 342 which are arranged in the reducer housing 39 and mesh with each other, the pinion 341 is connected to the output shaft of the motor 33, the large gear 342 is connected to the nut flange at one end of the nut 35 by a bolt, both ends of the nut 35 are supported in the reducer housing 39 by bearings, the nut 35 is threadedly matched with the large lead screw 36, the large lead screw 36 extends from both sides of the reducer housing 39, the motor 33 and the nut 35 are transmitted through the gear set 34, the axial movement of the large lead screw 36 is realized, and the thrust is generated.

[0034] In this embodiment, a reset mechanism for resetting the drive nut 35 is also provided in the reducer housing 39. The reset mechanism includes a reset spring 41. The reset spring 41 is provided on one side of the large gear 342. The free end of the reset spring 41 is connected to the large gear 342 through a locating pin. The fixed end of the reset spring 41 is connected to the reducer rear housing 392 through a locating pin. When the motor is reversed, the reset spring 41 will provide a return force, and the nut 35 can automatically return to its initial position, thereby driving the large lead screw 36 to contract and reset.

[0035] In this embodiment, one end of the nut 35 is connected to the reducer rear housing 392 through a tapered roller bearing 45 , and the other end is connected to the front cover plate 391 through a thrust roller bearing 46 .

[0036] In this embodiment, the output shaft of the motor 33 is installed with a spline sleeve 40 through a flat key, the splines of the spline sleeve 40 are fixedly connected to the inner ring of the adapter bearing 401 installed on the front cover plate 391, and the pinion 341 is installed on the splines of the spline sleeve 40.

[0037] In this embodiment, the long-lead screw 36 includes a polished rod section and a threaded section, one end of the polished rod section is connected to the threaded section, and the nut 35 cooperates with the threaded section.

[0038] Embodiment 2: The difference from Embodiment 1 lies in that a first sealing sleeve 421 and a second sealing sleeve 422 are respectively installed on both sides of the reducer housing by bolts, the first sealing sleeve 421 is connected to the front cover plate 391 , the second sealing sleeve 422 is connected to the rear housing 392 , and the bare rod section of the large lead screw 36 is sealed and extends out of the first sealing sleeve 421 .

[0039] In this embodiment, a sealing ring installation groove is provided at the front end of the first sealing sleeve 421, and a sealing ring 43 matching with the polished rod section is provided in the sealing ring installation groove.

[0040] Embodiment 3: On the basis of Embodiment 2, an anti-rotation mechanism is provided between the first sealing sleeve 421 and the light rod section, and the anti-rotation mechanism includes a disc 38 and a linear track 44; the annular inner wall of the first sealing sleeve 421 is provided with two radially symmetrical linear tracks 44 extending axially, and the light rod section is provided with a disc 38, and the disc 38 is provided with a track groove in the radial direction thereof that cooperates with the linear track 44, and the track groove cooperates with the linear track 44 to form a rotation restriction, so that the disc 38 and the large lead screw 36 can only move in the axial direction, thereby preventing the large lead screw 36 from being rotated by the nut 35; preferably, the disc 38 and the light rod section are manufactured as one piece.

[0041] Embodiment 4: A braking assembly comprises the above-mentioned electromechanical actuator unit 3.

[0042] Example 5: Figures 1 to 3 As shown, a drum brake structure includes a drum brake 1, an adjusting arm 2 and an electronic mechanical actuator 3, wherein the drum brake 1 is an S-type cam drum brake, a motor 33 drives a nut 35 through a gear set 34, the nut 35 rotates to drive the large lead screw 36 to move axially to generate thrust, so that the hinge ear 31 drives the adjusting arm 2 to rotate through the hinge 32, and the adjusting arm 2 then drives the cam 13 and the brake shoe 11 to work through the camshaft 12 of the drum brake 1, thereby realizing the drum brake braking.

[0043] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electromechanical actuator, characterized in that: It comprises a mounting plate (37), a motor (33) with an electromagnetic brake (331), an actuator and a reducer, wherein the motor (33) and the reducer are respectively mounted on two sides of the mounting plate (37); The actuator comprises a large lead screw (36), one end of which is provided with a hinged ear (31); The reducer comprises a reducer housing (39), a gear set (34) and a nut (35), wherein: The reducer housing (39) includes a front cover plate (391) and a rear housing (392); The gear set (34) comprises a pinion (341) and a large gear (342) which are arranged in a reducer housing (39) and mesh with each other. The pinion (341) is connected to the output shaft of the motor (33). The large gear (342) is connected to a nut flange at one end of a nut (35) through a bolt. Both ends of the nut (35) are supported in the reducer housing (39) through bearings respectively. The nut (35) is threadedly matched with a large lead screw (36).

2. The electromechanical actuator according to claim 1, characterized in that: A reset mechanism for resetting the drive nut (35) is also provided in the reducer housing (39), and the reset mechanism includes a reset coil spring (41). The reset coil spring (41) is provided on one side of the large gear (342), and the free end of the reset coil spring (41) is connected to the large gear (342) via a positioning pin, and the fixed end of the reset coil spring (41) is connected to the reducer rear housing (392) via a positioning pin.

3. The electromechanical actuator according to claim 1, characterized in that: One end of the nut (35) is connected to the reducer rear housing (392) through a tapered roller bearing (45), and the other end is connected to the front cover plate (391) through a thrust roller bearing (46).

4. The electromechanical actuator according to claim 1, characterized in that: The output shaft of the motor (33) is mounted with a spline sleeve (40) via a flat key, the splines of the spline sleeve (40) are fixedly connected to the inner ring of a transfer bearing (401) mounted on the front cover plate (391), and the pinion (341) is mounted on the splines of the spline sleeve (40).

5. The electromechanical actuator according to claim 1, characterized in that: The long-lead screw (36) comprises a polished rod section and a threaded section, one end of the polished rod section is connected to the threaded section, and a nut (35) cooperates with the threaded section.

6. The electromechanical actuator according to claim 5, characterized in that: A first sealing sleeve (421) and a second sealing sleeve (422) are respectively installed on both sides of the reducer housing by bolts, the first sealing sleeve (421) is connected to the front cover plate (391), the second sealing sleeve (422) is connected to the rear housing (392), and the bare rod section of the large lead screw (36) is sealed and extends out of the first sealing sleeve (421).

7. The electromechanical actuator according to claim 6, characterized in that: A sealing ring installation groove is provided at the front end of the first sealing sleeve (421), and a sealing ring (43) matching with the polished rod section is provided in the sealing ring installation groove.

8. The electromechanical actuator according to claim 6, characterized in that: An anti-rotation mechanism is provided between the first sealing sleeve (421) and the polished rod section, the anti-rotation mechanism comprising a disc (38) and a linear track (44); The annular inner wall of the first sealing sleeve (421) is provided with two radially symmetrical linear tracks (44) extending in the axial direction, the polished rod section is provided with a disc (38), and the disc (38) is provided with a track groove in the radial direction that matches the linear track (44).

9. The electromechanical actuator according to claim 8, characterized in that: The disc (38) and the polished rod section are integrally manufactured and formed.

10. A brake assembly, characterized in that: It comprises an electromechanical execution unit as claimed in any one of claims 1 to 9.

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