Brake drive mechanism and brake

Abstract

The application relates to a novel brake driving mechanism and brake. The brake driving mechanism is characterized in that the brake driving mechanism comprises a motor, a transmission device connected with the motor, a screw nut comprising a screw rod and a nut, the screw rod being connected with the transmission device, the motor driving the screw nut through the transmission device, a shell, the screw nut being installed on the shell, a cage and an elastic device, the screw rod penetrating through the cage, the cage being axially connected with the screw rod, the elastic device being arranged between the cage and the shell, a force sensor and a rotation-stopping washer, the screw rod penetrating through the force sensor and the rotation-stopping washer, the rotation-stopping washer connecting the force sensor with the shell, and the screw rod being arranged to abut against the rotation-stopping washer and the force sensor.

Description

Technical Field

[0001] This invention relates to a brake drive mechanism and a brake. Background Technology

[0002] As automobiles become increasingly intelligent, there is a growing focus on the precise control of various automotive components. The brake drive mechanism typically includes a motor, lead screw, and nut. To accurately understand and control the braking system, it is necessary to detect the magnitude of the braking force applied to the brake disc. In practical use, force sensors are in a free state when not braking, and gaps exist between the force-bearing surface and the mating surface, leading to inaccurate detection results. Furthermore, vibrations during use can also affect the stability of the sensor, resulting in inaccurate detection results. Summary of the Invention

[0003] One of the objectives of this invention is to overcome the shortcomings of the prior art and provide a brake drive mechanism and brake that improves the accuracy of braking force detection results.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] The brake drive mechanism is characterized by comprising:

[0006] Electric motor;

[0007] The transmission device is connected to the motor;

[0008] A lead screw nut, comprising a lead screw and a nut; the lead screw is connected to the transmission device; the motor drives the lead screw nut through the transmission device.

[0009] Housing, on which the lead screw nut is mounted;

[0010] It also includes a retainer and an elastic device, the lead screw passes through the retainer, and the retainer and lead screw are axially linked; the elastic device is disposed between the retainer and the housing;

[0011] A force sensor and an anti-rotation washer; the lead screw passes through the force sensor and the anti-rotation washer, and the anti-rotation washer connects the force sensor to the housing;

[0012] The lead screw is positioned to abut against the anti-rotation washer and the force sensor.

[0013] According to one embodiment of the present invention, a retaining ring is fitted on the lead screw; the retainer abuts against the retaining ring or a lubricating gasket is provided between the retainer and the retaining ring.

[0014] According to one embodiment of the present invention, the retainer includes a base plate, a cylindrical wall, and a wing plate; the base plate and the wing plate are respectively disposed at both ends of the cylindrical wall; the base plate is provided with a first through hole; the lead screw passes through the first through hole; and the elastic device is disposed between the wing plate and the housing.

[0015] According to one embodiment of the present invention, the wing plate is further provided with a first protrusion protruding radially from the wing plate and / or a second protrusion protruding axially from the wing plate; the protrusion cooperates with the housing to restrict the rotation of the cage.

[0016] According to one embodiment of the present invention, the force sensor has an end face, which is a force-bearing surface, and the end face abuts against the housing.

[0017] According to one embodiment of the present invention, a thrust bearing is further included, wherein the lead screw is rotatably connected to the housing via the thrust bearing; the thrust bearing contacts the anti-rotation washer.

[0018] According to one embodiment of the present invention, it further includes a thrust platform disposed on one side of the thrust bearing; the lead screw axially abuts against the thrust platform; the axial thrust of the lead screw is applied to the force sensor through the thrust platform, the thrust bearing, and the anti-rotation washer.

[0019] According to one embodiment of the present invention, a second lubricating gasket is provided between the thrust platform and the thrust bearing, and / or between the thrust bearing and the anti-rotation gasket.

[0020] According to one embodiment of the present invention, the anti-rotation washer includes a disk body and an anti-rotation protrusion, the anti-rotation protrusion protruding from the disk body in the axial and radial directions; the anti-rotation protrusion cooperates with the housing to restrict the rotation of the anti-rotation washer.

[0021] Another aspect of the present invention is to provide a brake, characterized in that it includes the aforementioned brake drive mechanism.

[0022] The brake drive mechanism and brake of this invention incorporate an elastic device. This device applies force to the lead screw, which is then transmitted to the force sensor, ensuring that the force sensor's contact surface is in contact with the mating surface of the housing. This prevents gaps between the force sensor and the mating surface from affecting the accuracy of the sensor's detection results. The elastic device consistently provides force to the lead screw and consequently to the force sensor, preventing vibrations from affecting the sensor's stability. This ensures the force sensor remains stable during use, thus guaranteeing the accuracy of the detection results. This invention utilizes a cage to mount the elastic component, facilitating assembly. The cage structure includes a base plate, a cylinder wall, and wing plates. The wing plates and base plate are respectively located at both ends of the cylinder wall, allowing the base plate to be recessed into the housing. The cage's compact structure after installation does not increase the overall volume. This invention also incorporates multiple lubrication gaskets to increase the lubrication of each component and prevent wear. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the brake structure in this invention.

[0024] Figure 2 This is a cross-sectional view of the brake in this invention.

[0025] Figure 3 This is a schematic diagram of the cage structure in this invention.

[0026] Figure 4 This is a cross-sectional view of the cage in this invention.

[0027] Figure 5 This is a schematic diagram of the wave spring structure in this invention.

[0028] Figure 6 This is a schematic diagram of the force sensor structure in this invention.

[0029] Figure 7 This is a schematic diagram of the anti-rotation gasket structure in this invention. Detailed Implementation

[0030] like Figures 1 to 7 As shown, the brake 100 includes a motor 120, a transmission device 130, a lead screw and nut, a housing 160, a bracket 170, an inner friction plate 181, and an outer friction plate 182. The motor 120 is connected to the transmission device 130. The transmission device 130 is connected to the lead screw and nut. A piston 183 is disposed within the housing 160. The inner friction plate 181 and the outer friction plate 182 are movably mounted on the bracket 170. The bracket 170 and the housing 160 are movably connected relative to each other. The motor 120 drives the piston 183 axially through the transmission device 130 and the lead screw and nut. The piston 183 drives the inner friction plate 181 and the outer friction plate 182 to move closer and further apart, thereby achieving braking and releasing the brake. The motor 120 and the transmission device 130 can be of the types found in the prior art, and will not be described further here.

[0031] The lead screw nut can be of a type found in the prior art. In one example shown in this invention, the lead screw nut includes a lead screw 151 and a nut 152. The lead screw 151 is rotatably mounted on the housing 160. The lead screw 151 and the nut 152 are threaded together. When the lead screw 151 rotates, it drives the nut 152 to move axially. The lead screw 151 includes a threaded engagement portion 153 and a connecting portion 154. The threaded engagement portion 153 and the connecting portion 154 are integrally formed. A transition step 155 is provided at the junction of the threaded engagement portion 153 and the connecting portion 154. The connecting portion 154 is connected to the transmission device 130. A retaining ring 156 is provided on the connecting portion 154.

[0032] The present invention also includes a retainer 190, which includes a base plate 191, a cylindrical wall 192, and a wing plate 193. The base plate 191 and the wing plate 193 are respectively disposed at both ends of the cylindrical wall 192. The cylindrical wall 192 forms a circular tube and has a cavity. The base plate 191 closes one end of the cavity. The wing plate 193 protrudes outward from the cylindrical wall 192. The base plate 191 is provided with a first through hole 197 for the connecting part 154 to pass through. The wing plate 193 is also provided with a first protrusion 195. The first protrusion 195 protrudes radially from the wing plate 193. The wing plate 193 is also provided with a second protrusion 196. The second protrusion 196 protrudes axially from the wing plate 193. The first protrusion 195 and the second protrusion 196 are inserted into the housing 160 and cooperate with the housing 160 to restrict the rotation of the retainer 190. The connecting part 154 of the lead screw 151 passes through the first through hole 197. The base plate 191 is in contact with the retaining ring 156, and the base plate 191 is blocked by the retaining ring 156 along the axial direction.

[0033] An elastic element is provided between the wing plate 193 and the housing 160. In the example shown, the elastic element is a wave spring 194. The wave spring 194 is arranged around the connecting portion 154. One end of the wave spring 194 abuts against the housing 160, and the other end abuts against the wing plate 193 of the retainer 190, providing preload to the retainer 190. Because the retainer 190 is blocked by the retaining spring 156, the preload is transmitted to the retaining spring 156 through the retainer 190, and then to the lead screw 151.

[0034] A force sensor 161 is disposed within the housing 160. The force sensor 161 may be approximately cylindrical and has an end face 162. The end face 162 is the force-bearing surface. The end face 162 faces the housing 160, and deforms when it contacts the mating surface on the housing 160. The magnitude of the force on the force sensor 161 can be detected by the magnitude of the deformation of the end face 162, and an electrical signal is output. A connecting part 154 passes through the force sensor 161. An anti-rotation washer 163 is disposed within the housing 160. The anti-rotation washer 163 includes a disc body 164 and an anti-rotation protrusion 165. The anti-rotation protrusion 165 protrudes from the disc body 164 axially and radially. The anti-rotation protrusion 165 is inserted into the housing 160 and cooperates with the housing 160 to restrict the rotation of the anti-rotation washer 163. The anti-rotation washer 163 abuts against the force sensor 161 to prevent the force sensor 161 from rotating.

[0035] The connecting part 154 is also fitted with a thrust platform 166 and a thrust bearing 167. The thrust platform 166 abuts against the transition step 155. The thrust bearing 167 is disposed between the thrust platform 166 and the anti-rotation washer 163. The connecting part 154 is rotatably connected to the housing 160 via the thrust bearing 167. The thrust platform 166 is in contact with the thrust bearing 167.

[0036] As an alternative embodiment of the present invention, a first lubricating pad (not shown in the figure) is provided between the base plate 191 of the cage and the retaining spring 156. The first lubricating pad is made of Teflon and has a lubricating effect to prevent wear between the base plate 191 and the retaining spring 156.

[0037] A second lubricating gasket (not shown in the figure) is provided between the thrust bearing 167 and the anti-rotation washer 163. The second lubricating gasket is made of Teflon and has a lubricating effect, which can prevent wear between the thrust bearing 167 and the anti-rotation washer 163.

[0038] The brake drive mechanism and brake of this invention incorporate an elastic device. This device applies force to the lead screw, which is then transmitted to the force sensor, ensuring that the force sensor's contact surface is in contact with the mating surface of the housing. This prevents gaps between the force sensor and the mating surface from affecting the accuracy of the sensor's detection results. The elastic device consistently provides force to the lead screw and consequently to the force sensor, preventing vibrations from affecting the sensor's stability. This ensures the force sensor remains stable during use, thus guaranteeing the accuracy of the detection results. This invention utilizes a cage to mount the elastic component, facilitating assembly. The cage structure includes a base plate, a cylinder wall, and wing plates. The wing plates and base plate are respectively located at both ends of the cylinder wall, allowing the base plate to be recessed into the housing. The cage's compact structure after installation does not increase the overall volume. This invention also incorporates multiple lubrication gaskets to increase the lubrication of each component and prevent wear.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A brake drive mechanism, characterized in that, include: Electric motor; The transmission device is connected to the motor; A lead screw nut, wherein the lead screw nut includes a lead screw and a nut; The lead screw is connected to the transmission device; the motor drives the lead screw nut through the transmission device. Housing, on which the lead screw nut is mounted; It also includes a retainer and an elastic device, the lead screw passes through the retainer, and the retainer and lead screw are axially linked; the elastic device is disposed between the retainer and the housing; A force sensor and an anti-rotation washer; the lead screw passes through the force sensor and the anti-rotation washer, and the anti-rotation washer connects the force sensor to the housing; The lead screw is positioned to abut against the anti-rotation washer and the force sensor; The retainer includes a base plate, a cylindrical wall, and wing plates; the base plate and the wing plates are respectively disposed at both ends of the cylindrical wall; the base plate is provided with a first through hole; the lead screw passes through the first through hole; the elastic device is disposed between the wing plates and the housing; The force sensor has an end face, which is the force-bearing surface, and the end face abuts against the housing.

2. The brake drive mechanism according to claim 1, characterized in that, A retaining ring is fitted onto the lead screw; the retainer is in contact with the retaining ring or a first lubricating pad is provided between the retainer and the retaining ring.

3. The brake drive mechanism according to claim 1, characterized in that, The wing plate is further provided with a first protrusion protruding radially from the wing plate and / or a second protrusion protruding axially from the wing plate; the protrusion cooperates with the housing to restrict the rotation of the cage.

4. The brake drive mechanism according to claim 1, characterized in that, It also includes a thrust bearing, through which the lead screw is rotatably connected to the housing; the thrust bearing contacts the anti-rotation washer.

5. The brake drive mechanism according to claim 4, characterized in that, It also includes a thrust platform, which is disposed on one side of the thrust bearing; the lead screw axially abuts against the thrust platform; the axial thrust of the lead screw is applied to the force sensor through the thrust platform, the thrust bearing, and the anti-rotation washer.

6. The brake drive mechanism according to claim 5, characterized in that, A second lubricating gasket is provided between the thrust platform and the thrust bearing, and / or between the thrust bearing and the anti-rotation gasket.

7. The brake drive mechanism according to claim 1, characterized in that, The anti-rotation washer includes a disc body and an anti-rotation protrusion, the anti-rotation protrusion protruding from the disc body in the axial and radial directions; the anti-rotation protrusion cooperates with the housing to restrict the rotation of the anti-rotation washer.

8. A brake, characterized in that, Includes the brake drive mechanism as described in any one of claims 1 to 7.

Images