TWM676713U - Motor drive components and their applications in electronic parking brake devices - Google Patents

Abstract

This invention proposes a motor transmission assembly and its application in an electronic parking brake device, comprising: an outer cover, a drive component, a transmission seat, a limiting component, and a push-off assembly. When the drive component is driven by the motor, the transmission seat is limited by the limiting component, causing the transmission seat to axially displace along the drive component toward the caliper in a non-rotating manner. The outer surface of the transmission seat pushes the push-off assembly axially, causing the push-off assembly to drive the piston to push the caliper to abut against the disc, achieving an improved effect of ease of use.

Description

Motor drive components and their applications in electronic parking brake devices

This invention relates to the field of motor transmission technology, particularly to applications in electronic parking brake devices.

Note that conventional electronic parking systems, regardless of the parking operation, suffer from limitations on the eccentric shaft. If the eccentric shaft applies excessive force to the oil seal under abnormal oscillation, the oil seal will be overstressed and deformed, resulting in oil leakage. In view of this, the applicant has conducted research and development on related products, thereby creating an innovative and practical invention.

This novel motor transmission assembly and its application in electronic parking brake systems primarily aim to address the shortcomings of electronic parking brakes, such as excessive compression and torsion of the oil seals.

To achieve the aforementioned objectives and effects, this invention proposes a motor transmission assembly and its application in an electronic parking brake device, comprising: an outer cover; a movable seat slidably spanning the caliper and having a transmission groove facing the movable seat; a drive member, passing through the outer cover and partially located in the transmission groove; a transmission seat, screwed onto the drive member, with one end of the transmission seat having an outer abutment surface facing the transmission groove; a limiting member, positioned between the transmission groove and the transmission seat; and a pushing assembly, one end abutting against the outer abutment surface, and the other end passing through the outside of the caliper and sealed against the piston. Thus, when the drive member is driven by an external force, the transmission seat, restricted by the limiting member, can only move axially in the direction of the caliper without rotating, while the pushing assembly drives the piston to push against the caliper and abut against the disc surface.

1: Motor transmission components

10: Outer cover

100: Transmission slot

101: Inner Gap

11: Drivers

110: Drive section

111: Propeller section

112: Separator

113: Spiral Bead Ditch

114: Drive hole

115: Buckle Ring

116: Inner spiral arc segment

117: External spiral arc segment

12: Transmission seat

120: Outer surface

121: First needle roller thrust bearing

122: External Gap

123: Second Thrust Bearing

124: Rolling Pearls

125: Inner side

13: Restricted Items

14: Push-off Kit

140: Supporting Components

141: Shaft Ejector

142: Internal flash port

143: Axle Section

144: Push-head section

145: Dodge Hole

2: Clamps

20: Left side area

21: Pistons

22: Disc

23: Active Seat

24: Right side area

25: Oil seal

The first figure is a three-dimensional assembly diagram of the motor transmission assembly of the first embodiment of this invention.

The second figure is an exploded 3D view of this new type of caliper.

Figure 3 is a cross-sectional view of the motor transmission assembly of the first embodiment of this invention.

Figure 4 is a cross-sectional view of the motor transmission assembly of the second embodiment of this invention.

Figure 5 is a cross-sectional view of the motor transmission assembly of the third embodiment of this invention.

Figure 6 is a cross-sectional view of the motor transmission assembly of the fourth embodiment of this invention.

Figure 7 is a cross-sectional view of the motor transmission assembly of the fifth embodiment of this invention.

Please refer to Figures 1 through 7. The novel motor transmission assembly and its application in an electronic parking brake system include:

Motor transmission assembly 1 includes an outer cover 10, a drive component 11, a transmission base 12, a limiting component 13, and a pushing assembly 14.

The outer cover 10 slides across the left side 20 of the movable seat 23 of the caliper 2, and has a transmission groove 100 with its opening facing the movable seat 23. A drive member 11 passes through the outer cover 10 and is partially located in the transmission groove 100. A transmission seat 12 is screwed onto the drive member 11 and located within the transmission groove 100, with one end having an outer abutment surface 120. A limiting member 13 is positioned between the transmission groove 100 and the transmission seat 12. A pushing assembly 14 has one end abutting against the outer abutment surface 120 of the transmission seat 12, and the other end passes through the outside of the caliper 2 and abuts against the piston 21.

When the drive unit 11 is driven by an external force (e.g., a motor), the transmission seat 12 is restricted by the stop member 13, causing the transmission seat 12 to axially displace along the drive unit 11 toward the clamp 2 in a non-rotating manner. At the same time, the outer abutment surface 120 of the transmission seat 12 abuts against the pusher assembly 14 and causes it to axially displace, so that the pusher assembly 14 drives the piston 21 to push against the clamp 2 and then abut against the surface of the disc 22. It is worth mentioning that the push-off assembly 14 does not rotate during axial displacement. Therefore, the oil seal 25 of the caliper 2 will not be excessively compressed and deformed during axial displacement. Furthermore, since the push-off assembly 14 is pushed by the drive member 11, with the maximum length of both ends of the push-off assembly 14 and the drive member 11, the aforementioned pushing action will cause the drive member 11 to move the movable seat 23 to the left, so that the right side 24 of the movable seat 23 abuts against the disc 22, thus completing the operation of the electronic parking brake device under the drive of the motor transmission assembly 1.

Furthermore, the drive member 11 has a drive section 110, a helical section 111, and a partition section 112 connecting the drive section 110 and the helical section 111. The drive section 110 passes through the outer cover 10, the partition section 112 is located in the transmission groove 100, and the transmission seat 12 is screwed into the helical section 111. The radial dimension of the partition section 112 is larger than the radial dimensions of the drive section 110 and the helical section 111. The partition section 112 allows the drive member 11 to move from the transmission groove 100. The slot of transmission groove 100 detaches in the opposite direction, while the drive section 110 is provided with a drive hole 114 for connection and positioning with the motor shaft (not shown in the figure); in addition, the outer periphery of the outer drive section 110 is engaged with a snap-fit ring 115 to prevent the drive component 11 from detaching from the slot of transmission groove 100, and the screw section 111 and the transmission seat 12 form a screw assembly, allowing the transmission seat 12 to move forward and backward quickly under the drive component 11, which helps to quickly achieve parking and release actions after parking.

Furthermore, the transmission base 12 further includes a first needle roller thrust bearing 121, sleeved on the drive section 110 and located between the bottom of the transmission groove 100 and the partition section 112. The first needle roller thrust bearing 121 prevents the partition section 112 from directly contacting the bottom of the transmission groove 100, and during operation of the drive member 11, the surface of the partition section 112 will not rub against the bottom of the transmission groove 100, thus allowing the partition section 112 to rotate smoothly corresponding to the first needle roller thrust bearing 121.

Furthermore, the transmission groove 100 has an inner notch 101 on its groove wall, and the transmission seat 12 has an outer notch 122 corresponding to the inner notch 101 on its outer periphery. A limiting member 13 is disposed between the inner notch 101 and the outer notch 122. Both the inner notch 101 and the outer notch 122 are generally semi-circular and concave. When the inner notch 101 and the outer notch 122 are aligned, they form a cylindrical concave shape. When the limiting member 13 is a cylindrical component and disposed between the inner notch 101 and the outer notch 122, it restricts the transmission seat 12 to axial displacement along the drive member 11 without rotation.

Please refer again to Figures 1 through 3. The push-pull assembly 14 includes different embodiments. In the first embodiment, the push-pull assembly 14 has abutment member 140 and thrust member 141 that are combined with each other. One end of the abutment member 140 abuts against the outer abutment surface 120, while one end of the thrust member 141 abuts against the piston 21 and its outer periphery passes through the clamp 2. The abutment member 140 and the thrust member 141 are in a convex-concave engagement configuration. The abutment member 140 also has an inner flash hole 142, through which the outer edge of the abutment member 140 abuts against the outer abutment surface 120, and the screw section 111 is partially accommodated within the inner flash hole 142.

Please refer to Figure 4 for a second embodiment of the push-pull assembly 14. In the second embodiment, the push-pull assembly 14 has a shaft section 143 and a push head section 144 connected to each other. The outer periphery of the shaft section 143 passes through the clamp 2, and one end of the push head section 144 abuts against the piston 21. The push head section 144 and the shaft section 143 can be two components that are then fixed together by processing (e.g., welding). Furthermore, the pusher section 144 and the shaft section 143 are eccentrically positioned. The end of the shaft section 143 not connected to the pusher section 144 has a dodge hole 145, and the pusher assembly 14 abuts against the outer abutment surface 120 via the outer edge of the dodge hole 145. The screw section 111 is partially accommodated within the dodge hole 145.

Please refer to Figure 5 for a third embodiment of the novel push-pull assembly 14. The third embodiment differs from the second embodiment in that the push-head section 144 and the shaft section 143 are coaxially arranged, and the shaft section 143 and the push-head section 144 are integrally formed components; furthermore, the transmission base 12 includes a second needle roller thrust bearing 123, sleeved on the screw section 111 and located between the inner abutment surface 125 and the partition section 112 of the transmission base 12, with the inner abutment surface 125 and the outer abutment surface 120 respectively located at both ends of the transmission base 12.

Please refer to Figure 6, which shows a fourth embodiment of the push-out kit 14 of this novel invention. The fourth embodiment differs from the third embodiment in that: the outer periphery of the helical section 111 is provided with a helical ball groove 113, and the transmission seat 12 is equipped with a plurality of balls 124 corresponding to the helical ball groove 113 and rolling relative to it.

Please refer to Figure 7, which shows the fifth embodiment of the push-pull kit 14 of this novel invention. The fifth embodiment differs from the fourth embodiment in that: the outer periphery of the helical section 111 is provided with an inner helical arc section 116, while the transmission seat 12 is equipped with a corresponding outer helical arc section 117 that rolls relative to the inner helical arc section 116, thus increasing the rotational pitch of the helical section 111 by one revolution.

1: Motor transmission components

10: Outer cover

11: Drivers

114: Drive hole

2: Clamps

20: Left side area

23: Active Seat

Claims (8)

A motor transmission assembly for use in an electronic parking brake device includes: an outer cover slidably mounted on a caliper's movable seat, the outer cover having a transmission groove with the opening of the groove facing the movable seat; a drive member passing through the outer cover and partially located in the transmission groove; a transmission seat screwed onto the drive member and located within the transmission groove, one end of the transmission seat having an outer abutment facing the opening of the transmission groove, and the transmission seat being axially displaced without rotation along the drive member toward the caliper; and a stop member positioned between the transmission groove and the transmission seat and limiting the transmission seat; and The pusher assembly is pushed at one end by the outer surface of the transmission seat, so that the other end of the pusher assembly passes through an oil seal outside the caliper and abuts against a piston. The pusher assembly drives the piston to push the caliper against the surface of a disc. The motor transmission assembly described in claim 1 is used in an electronic parking brake device, wherein the drive component includes a drive section, a helical section, and a partition section connecting the drive section and the helical section. The drive section passes through the outer cover, the partition section is located in the transmission groove, and the transmission seat is screwed into the helical section. The helical section has a helical ball groove on its outer periphery, and the transmission seat is equipped with a plurality of balls that roll relative to each other in the helical ball groove. The helical section also has... The transmission seat has two external threads and two internal threads that are screwed into the two external threads. The transmission seat further includes a first needle roller thrust bearing and a second needle roller thrust bearing. The first needle roller thrust bearing is sleeved on the drive section and located between the bottom of the transmission groove and the partition section. The second needle roller thrust bearing is sleeved on the screw section and located between the inner abutment surface of the transmission seat and the partition section. The inner abutment surface and the outer abutment surface are respectively located at both ends of the transmission seat. The motor drive assembly described in claim 2 is used in an electronic parking brake device, wherein the push assembly includes a shaft section and a push head section connected to each other, the outer periphery of the shaft section is provided through an oil seal of the caliper, and one end of the push head section abuts against the piston. The motor drive assembly described in claim 3 is used in an electronic parking brake device, wherein the end of the shaft section not connected to the pusher section is provided with a shunting hole, the pusher assembly is abutted against the outer abutting surface with the outer edge of the shunting hole, and the screw section is partially accommodated in the shunting hole. The motor drive assembly described in claim 1 is used in an electronic parking brake device, wherein the push assembly includes a push member and a thrust member that are combined with each other. One end of the push member abuts against the outer abutting surface, and one end of the thrust member abuts against the piston and passes through the oil seal of the caliper on its outer periphery. The motor drive assembly described in claim 5 is used in an electronic parking brake device, wherein the abutment member and the shaft thrust member are in a convex-concave engagement type. The motor transmission assembly described in claim 1 is used in an electronic parking brake device, wherein the transmission groove has an inner notch in its groove wall, the outer periphery of the transmission seat has an outer notch corresponding to the inner notch, and the limiting member is disposed between the inner notch and the outer notch. A motor transmission assembly includes: an outer cover; a movable seat for sliding a clamp; the outer cover having a transmission groove with the opening of the transmission groove facing the movable seat; a drive member passing through the outer cover and partially located in the transmission groove; a transmission seat screwed onto the drive member and located within the transmission groove, one end of the transmission seat having an outer abutment surface facing the opening of the transmission groove, and the transmission seat being axially displaced along the drive member toward the clamp without rotation; a limiting member positioned between the transmission groove and the transmission seat and limiting the transmission seat; and a pushing assembly, one end of which is pushed by the outer abutment surface of the transmission seat.