Motor transmission assembly and motor transmission assembly for electronic parking braking system

Abstract

To provide a motor transmission assembly and a motor transmission assembly applied to an electronic parking braking device, which prevent an oil seal from being excessively compressed and twisted when electronic parking is performed. [Solution] A motor transmission assembly (1) for use in an electronic parking braking device comprises an outer cover (10), a driving member (11), a transmission base, a locking member, and a pressing sleeve. The outer cover is slidably mounted on a movable base (23) of a caliper (2). The outer cover has a transmission basin. The basin opening faces the movable base. The driving member is pivotally mounted on the outer cover and partially located in the transmission basin. The transmission base is threadedly mounted on the driving member and is located within the transmission basin. One end of the transmission base has an outer pressing surface facing the basin opening. The transmission base displaces axially along the driving member toward the caliper without rotating.

Description

[Technical Field]

[0001] The present invention relates to the technical field of motor transmission, and is particularly applicable to electronic parking braking systems. [Background technology]

[0002] In the past, electronic parking systems were subject to the constraints of the eccentric shaft when operating the parking operation, and the eccentric shaft would swing abnormally, causing force to be applied to the oil seal, which would then be subjected to excessive force, causing compression deformation and oil leakage. In light of this situation, the applicant has researched, developed and improved related products, and has completed the present invention, which is an inventive and practical device. Summary of the Invention [Problem to be solved by the invention]

[0003] The main object of the present invention is to provide a motor transmission assembly and a motor transmission assembly for use in an electronic parking braking device that can prevent the oil seal from being over-compressed and twisted during electronic parking. [Means for solving the problem]

[0004] In order to solve the above problems, according to a first aspect of the present invention, there is provided a motor transmission assembly for an electronic parking braking device, comprising an outer cover, a driving member, a transmission base, a locking member, and a pressing sleeve, wherein the outer cover is slidably mounted on a movable base of a caliper, the outer cover has a transmission basin, the basin opening faces the movable base, the driving member is pivotally mounted on the outer cover and a portion thereof is located in the transmission basin, the transmission base is screwed onto the driving member and is located within the transmission basin, one end of the transmission base has an outer pressing surface and faces the basin opening direction, the transmission base is axially displaced along the driving member toward the caliper without rotating, the locking member is positioned between the transmission tank and the transmission base and restrains the transmission base, one end of the pressing sleeve is in contact with the outer pressing surface of the transmission base and the other end is inserted into an oil seal from the outside of the caliper and in contact with a piston, and the pressing sleeve drives the piston to cause the caliper to abut against the surface of the disc. [Effects of the Invention]

[0005] The motor transmission assembly of the present invention and the motor transmission assembly applied to the electronic parking braking device can prevent the oil seal from being excessively compressed and twisted during electronic parking. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is an assembled perspective view of a motor transmission assembly according to a first embodiment of the present invention; [Figure 2] 1 is an exploded perspective view of a caliper according to an embodiment of the present invention; [Figure 3] 1 is a cross-sectional view of a motor transmission assembly according to a first embodiment of the present invention; [Figure 4] 10 is a cross-sectional view of a motor transmission assembly according to a second embodiment of the present invention; [Figure 5] 10 is a cross-sectional view of a motor transmission assembly according to a third embodiment of the present invention; [Figure 6] 10 is a cross-sectional view of a motor transmission assembly according to a fourth embodiment of the present invention; [Figure 7] 10 is a cross-sectional view of a motor transmission assembly according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] Please refer to Figures 1 to 7. As shown in FIGS. 1 to 7, the motor transmission assembly and the motor transmission assembly applied to the electronic parking braking device according to an embodiment of the present invention include a motor transmission assembly 1.

[0008] The motor transmission assembly 1 includes an outer cover 10, a driving member 11, a transmission base 12, a locking member 13 and a pressing sleeve 14.

[0009] The outer cover 10 is slidably mounted on the left side portion 20 of the movable base 23 of the caliper 2. The outer cover 10 has a transmission casing 100. The casing opening of the transmission casing 100 faces the movable base 23. The driving member 11 is pivotally mounted on the outer cover 10, with a portion of the driving member 11 located in the transmission casing 100. The transmission base 12 is screwed onto the driving member 11 and is located within the transmission casing 100. One end of the transmission base 12 is provided with an outer pressing surface 120. The locking member 13 is constrained between the transmission casing 100 and the transmission base 12. One end of the pressing sleeve 14 abuts against the outer pressing surface 120 of the transmission base 12, and the other end is inserted from the outside of the caliper 2 and abuts against the piston 21.

[0010] When the driving member 11 is driven by an external force (e.g., a motor), the transmission base 12 is restricted by the locking member 13, and the transmission base 12 is displaced axially along the driving member 11 toward the caliper 2 without rotating. At the same time, the outer pressing surface 120 of the transmission base 12 presses the pressing sleeve 14 to displace it axially, and the pressing sleeve 14 presses the piston 21, causing the caliper 2 to abut against the surface of the disc 22. Here, the pressure sleeve 14 does not rotate even when displaced in the axial direction, so that the oil seal 25 of the caliper 2 is prevented from being compressed and deformed by excessive force when the pressure sleeve 14 is displaced in the axial direction. Furthermore, since the pressure sleeve 14 receives the pushing action of the driving member 11, the ends of the pressure sleeve 14 and the driving member 11 increase in maximum length, and due to the pushing action, the driving member 11 displaces the movable base 23 leftward, causing the right side portion 24 of the movable base 23 to abut against the disc 22, driving the motor transmission assembly 1 to operate the electronic parking braking device.

[0011] The drive member 11 has a drive step 110, a screw step 111, and a separation step 112 connected to the drive step 110 and the screw step 111. The drive step 110 is inserted into the outer lid 10, and the separation step 112 is located in the transmission tub 100. The transmission base 12 is screwed onto the screw step 111. The radial dimension of the separation step 112 is larger than the radial dimensions of the drive step 110 and the screw step 111. The drive member 11 is removed from the opening of the transmission tub 100 in the opposite direction via the separation step 112, and the drive step 110 has a drive hole 114 (not shown) used for connecting with the shaft center of the motor and positioning it. By hooking the outer periphery of the drive step 110 onto the engagement ring 115, the drive member 11 is prevented from coming off the direction of the tank opening of the transmission tank 100, and the helical step 111 and the transmission base 12 form a screw group, which allows the transmission base 12 to be driven by the drive member 11 and move back and forth quickly, thereby facilitating quick parking and release operations after parking.

[0012] The transmission base 12 is fitted into the driving stage 110 and includes a first needle roller thrust bearing 121 located between the bottom of the transmission sump 100 and the separating stage 112. The first needle roller thrust bearing 121 prevents the separating stage 112 from coming into direct contact with the bottom of the transmission sump 100. When the driving member 11 is operating, the surface of the separating stage 112 is prevented from coming into contact with and rubbing against the bottom of the transmission sump 100, so that the separating stage 112 can rotate smoothly in correspondence with the first needle roller thrust bearing 121.

[0013] An inner notch 101 is formed in the wall of the transmission sump 100. An outer notch 122 corresponding to the inner notch 101 is formed on the outer periphery of the transmission base 12. The locking member 13 is assembled between the inner notch 101 and the outer notch 122. The inner notch 101 and the outer notch 122 are each formed to be approximately semicircular and concave. When the openings of the inner notch 101 and the outer notch 122 correspond to each other to form circular columnar concaves, and the locking member 13 is molded into a circular columnar member and assembled to the inner notch 101 and the outer notch 122, the transmission base 12 is restricted to displacement only along the axial direction of the drive member 11 and is prevented from rotating.

[0014] Please refer to FIGS. 1 to 3 again. As shown in FIGS. 1 to 3, the pressing sleeve 14 includes different embodiments. The pressing sleeve 14 according to the first embodiment of the present invention has a contact member 140 and a shaft pushing member 141 that are combined with each other. One end of the contact member 140 contacts the outer pressing surface 120. One end of the shaft pushing member 141 contacts the piston 21, and the outer periphery of the shaft pushing member 141 is inserted into the caliper 2. The contact member 140 and the shaft pushing member 141 are engaged with each other through a recess and protrusion. The contact member 140 has an inner relief hole 142. The outer edge of the inner relief hole 142 of the contact member 140 contacts the outer pressing surface 120, and a portion of the screw step 111 is received in the inner relief hole 142.

[0015] Referring again to FIG. As shown in FIG. 4 , a pressing sleeve 14 according to a second embodiment of the present invention has a shaft body step 143 and a push head step 144 connected to each other. The outer periphery of the shaft body step 143 is inserted into the caliper 2, and one end of the push head step 144 abuts against the piston 21. The push head step 144 and the shaft body step 143 are two separate parts, and may be fixed together by machining (e.g., welding). The push head step 144 and the shaft body step 143 are eccentrically positioned, and an escape hole 145 may be formed in the end of the shaft body step 143 that is not connected to the push head step 144. The outer edge of the escape hole 145 abuts against the outer pressing surface 120 of the pressing sleeve 14, and a portion of the screw step 111 is received in the escape hole 145.

[0016] Referring again to FIG. As shown in Figure 5, the third embodiment of the pressure sleeve 14 of the present invention differs from the second embodiment in that the push head step 144 and the shaft body step 143 are coaxially arranged. The shaft body step 143 and the push head step 144 are integrally molded. The transmission base 12 includes a second needle roller thrust bearing 123. The second needle roller thrust bearing 123 is fitted into the screw step 111 and is located between the inner pressing surface 125 and the separating step 112 of the transmission base 12, with the inner pressing surface 125 and the outer pressing surface 120 located at both ends of the transmission base 12, respectively.

[0017] Referring again to FIG. 6, the pressing sleeve 14 according to the fourth embodiment of the present invention differs from the third embodiment in that it has a helical ball groove 113 on the outer periphery of the helical step 111. The transmission base 12 is provided with a corresponding helical ball groove 113 and has a number of balls 124 that roll correspondingly.

[0018] Referring again to FIG. 7, the pressing sleeve 14 according to the fifth embodiment of the present invention differs from the fourth embodiment in that it has an inner spiral arc section 116 on the outer periphery of the spiral section 111. The transmission base 12 may be provided with a corresponding inner spiral arc section 116 and a corresponding rolling outer spiral arc section 117, thereby increasing the spiral section 111 by one turn. [Explanation of symbols]

[0019] 1 Motor Transmission Assembly 2 calipers 10 Outer lid 11 Driving member 12 Transmission base 13 Locking member 14 Pressing sleeve 20 Left side part 21 Piston 22 discs 23 Movable platform 24 Right side part 25 Oil seal 100 Transmission tank 101 Internal notch 110 Drive stage 111 Spiral stepped section 112 Separation step 113 Spiral ball groove 114 Drive hole 115 Engagement ring 116 Inner spiral arc step 117 Outer spiral arc step 120 External pressing surface 121 No. 1 needle roller thrust bearing 122 outer notch 123 Second needle roller thrust bearing 124 balls 125 Inner pressing surface 140 Contact member 141 Axial push member 142 Internal relief hole 143 Shaft body step 144 Push head section 145 Relief hole

Claims

1. A motor transmission assembly for application in an electronic parking braking device, comprising an outer cover, a driving member, a transmission base, a locking member and a pressing sleeve, the outer cover is slidably mounted on a movable base of the caliper, the outer cover has a transmission tub, and a tub opening of the transmission tub faces the movable base; The driving member is pivotally attached to the outer cover, and a portion of the driving member is located in the transmission tub. The transmission base is screwed onto the driving member and is located within the transmission tank. One end of the transmission base has an outer pressing surface and faces the tank opening of the transmission tank. The transmission base is displaced axially along the driving member toward the caliper without rotating. the locking member is positioned between the transmission tank and the transmission base and restrains the transmission base; the pressing sleeve has one end abutting the outer pressing surface of the transmission base and the other end inserted into an oil seal from outside the caliper to abut against a piston, and the pressing sleeve drives the piston to bring the caliper into abutment against a surface of a disc.

2. the drive member has a drive step portion, a screw step portion, and a separation step portion connected to the drive step portion and the screw step portion, The driving stage is inserted into the outer cover, the separating stage is located in the transmission tank, the transmission base is screwed onto the screw stage, the driving stage has a spiral ball groove on the outer periphery, and the transmission base has a corresponding spiral ball groove and a plurality of balls that roll in the corresponding spiral ball groove; Two male threaded portions are provided on the outer periphery of the drive stage, and two female threaded portions are provided on the transmission base to be threadedly engaged with the two male threaded portions, the transmission base includes a first needle roller thrust bearing and a second needle roller thrust bearing; the first needle roller thrust bearing is fitted into the driving step and is located between the bottom of the transmission trough and the separating step; 2. The motor transmission assembly for use in an electronic parking braking device according to claim 1, wherein the second needle roller thrust bearing is fitted into the screw step and is located between the inner pressing surface of the transmission base and the separating step, and the inner pressing surface and the outer pressing surface are located at both ends of the transmission base, respectively.

3. The pressing sleeve has a shaft body step portion and a push head step portion connected to each other, 3. The motor transmission assembly for use in an electronic parking braking device according to claim 2, wherein an outer circumferential side of the shaft body step is inserted into the oil seal of the caliper, and one end of the push head step is in contact with the piston.

4. an escape hole is formed at one end of the shaft body step portion to which the push head step portion is not connected; 4. The motor transmission assembly applicable to an electronic parking braking device according to claim 3, wherein the pressing sleeve has an outer edge of the relief hole abutted against the outer pressing surface, so that a portion of the spiral step is accommodated in the relief hole.

5. The pressing sleeve includes an abutting member and a shaft pushing member that are combined with each other; 2. The motor transmission assembly for use in an electronic parking braking device according to claim 1, wherein one end of the abutment member abuts on the outer pressing surface, and one end of the shaft pushing member abuts on the piston and an outer circumferential side of the shaft pushing member is inserted into the oil seal of the caliper.

6. 6. The motor transmission assembly for use in an electronic parking braking system as claimed in claim 5, wherein the abutting member and the shaft pushing member are engaged with each other by a protrusion and recess.

7. An inner notch is formed in the wall of the transmission barrel, An outer notch corresponding to the inner notch is formed on the outer periphery of the transmission base, 2. The motor transmission assembly for use in an electronic parking braking system as claimed in claim 1, wherein the locking member is assembled between the inner notch and the outer notch.

8. A motor transmission assembly comprising an outer cover, a driving member, a transmission base, a locking member and a pressing sleeve, the outer cover is slidably mounted on a movable base of the caliper, the outer cover has a transmission tub, and a tub opening of the transmission tub faces the movable base; The driving member is pivotally attached to the outer cover, and a portion of the driving member is located in the transmission tub. The transmission base is screwed onto the driving member and is located within the transmission tank. One end of the transmission base has an outer pressing surface and faces the tank opening of the transmission tank. The transmission base is displaced axially along the driving member in a direction toward the caliper, but does not rotate. the locking member is positioned between the transmission tank and the transmission base and restrains the transmission base; The motor transmission assembly is characterized in that one end of the pressing sleeve abuts against the outer pressing surface of the transmission base.

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