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CN-121993508-A - Torque limiter

CN121993508ACN 121993508 ACN121993508 ACN 121993508ACN-121993508-A

Abstract

The present invention relates to a torque limiter. The torque limiter comprises an outer rotating part and an inner rotating part, a plurality of contact plates distributed along the circumferential direction, wherein each contact plate is mounted to the outer rotating part through a respective pin joint end, each contact plate is arranged adjacent to the free end of one adjacent contact plate through a free end and is arranged adjacent to the pin joint end of the other adjacent contact plate through a pin joint end, a plurality of connecting frames, a plurality of elastic pieces, each elastic piece is arranged between the corresponding connecting frame and the outer rotating part, the inner rotating part comprises a plurality of protruding parts distributed along the circumferential direction and protruding towards the outer side in the radial direction respectively, and each protruding part pushes the corresponding contact plate to overcome the elastic force of the corresponding elastic piece during the rotation of the inner rotating part from a first rotating position to a second rotating position, so that the corresponding two adjacent arranged free ends are driven to jointly rotate away from a central axis through the corresponding connecting frames. The torque limiter has an improved structure.

Inventors

  • TANG JIE
  • LIANG XIAOLI
  • YAN KEZHI

Assignees

  • 舍弗勒技术股份两合公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. A torque limiter, the torque limiter comprising: An outer rotating member (10) and an inner rotating member (20), the inner rotating member (20) being mounted radially inside the outer rotating member (10), the outer rotating member (10) and the inner rotating member (20) being rotatable about a common central axis (O), respectively; -a plurality of contact plates (30), each contact plate (30) comprising a pivot end and a free end opposite each other and being mounted to a radially inner side of the outer rotating member (10) by means of a respective pivot end such that the free end of each contact plate (30) is rotatable relative to the outer rotating member (10) about a respective pivot axis, the plurality of contact plates (30) being distributed circumferentially such that each contact plate (30) is arranged adjacent to the free end of one adjacent contact plate (30) by means of a respective free end and to the pivot end of another adjacent contact plate (30) by means of a respective pivot end; A plurality of connection frames (40) to which free ends of any two adjacent ones of the plurality of contact plates (30) are respectively movably connected, and A plurality of elastic members (50), each elastic member (50) being arranged between a respective link (40) and the outer rotating member (10) so as to apply an elastic force to the respective link (40) to rotate the respective two adjacently arranged free ends closer to the central axis (O); Wherein the inner rotary member (20) comprises a plurality of protrusions (22) distributed circumferentially and protruding towards the radially outer side, respectively, the inner rotary member (20) having a first rotational position and a second rotational position with respect to the outer rotary member (10), in which first rotational position each protrusion (22) is aligned between respective two adjacently arranged pivot ends, and in which second rotational position each protrusion (22) is aligned between respective two adjacently arranged free ends, during rotation of the inner rotary member (20) from the first rotational position to the second rotational position each protrusion (22) pushing the respective contact plate (30) against the elastic force of the respective elastic member (50) to jointly rotate away from the central axis (O) via the respective connecting frame (40), such that the plurality of contact plates (30) can pass the second rotational torque beyond the predetermined rotational torque range (20) within the predetermined range between the outer rotary member (10) and the inner rotary member (20).
  2. 2. Torque limiter according to claim 1, characterized in that the pivot axes of the plurality of contact plates (30) are each parallel to the central axis (O) and have the same spacing relative to the central axis (O) as each other.
  3. 3. Torque limiter according to claim 2, characterized in that the plurality of contact plates (30) are arranged in the same plane perpendicular to the central axis (O) and/or that the plurality of contact plates (30) have axial extensions coinciding with each other.
  4. 4. A torque limiter according to claim 2, characterized in that the pivot axes of any two contact plates (30) arranged adjacently through respective pivot ends coincide with each other.
  5. 5. Torque limiter according to claim 2, characterized in that each connecting frame (40) comprises a sliding pin, each contact plate (30) comprises a sliding groove formed at the respective free end, the sliding pin of each connecting frame (40) being inserted axially in a loose fit manner into the respective sliding groove, so that the respective two adjacently arranged free ends can be jointly rotated away from or closer to the central axis (O).
  6. 6. A torque limiter according to claim 2, characterized in that when the inner rotary member (20) is in the first rotary position, any two adjacently arranged free ends have a relative position closest to each other with a gap in between.
  7. 7. A torque limiter according to claim 2, wherein each resilient member (50) is in a pre-deformed state when the inner rotary member (20) is in the first rotary position, whereby the inner rotary member (20) tends to remain in the first rotary position.
  8. 8. The torque limiter according to any one of claims 1 to 7, characterized in that the inner rotating member (20) includes a base circle portion (21), an outer peripheral edge of the base circle portion (21) having a uniform radius with respect to the central axis (O), the plurality of protruding portions (22) protruding radially outward from the outer peripheral edge of the base circle portion (21) and being circumferentially spaced apart on the outer peripheral edge of the base circle portion (21), respectively.
  9. 9. The torque limiter according to claim 8, characterized in that in a section perpendicular to the central axis (O), each boss (22) comprises a rounded tip towards the radially outer side and two circumferentially opposite side edges, the circumferential width of each boss (22) gradually increasing from the respective tip towards the radially inner side.
  10. 10. Torque limiter according to claim 9, characterized in that in a section perpendicular to the central axis (O): The two side edges of each boss (22) are respectively connected to the outer periphery of the base circle (21) in a smooth transition manner, or Two adjacent side edges of any two adjacent bosses (22) are connected to each other in a smooth transition.

Description

Torque limiter Technical Field The invention relates to the technical field of transmission. In particular, the present invention relates to a torque limiter. Background In various transmission systems, it is sometimes desirable to provide a torque limiting function in order to reduce the risk of damage to the transmission components from excessive torque. For example, when a hybrid or electric vehicle passes over a bumpy road surface in an accelerating or ABS braking condition, the drive components in the transmission may experience torque shock from the wheel end, especially in a hybrid direct drive or hub drive vehicle, which may cause shaft or gear failure in the driveline. Therefore, there is a need to provide torque limiting functionality in the driveline to prevent such torque shock from being transferred into the transmission. In the prior art, there are various types of torque limiters that provide torque limiting functions in different ways, such as clutch-type torque limiters, switch-type torque limiters, and the like. However, existing torque limiters of these types tend to have certain limitations. For example, existing clutch torque limiters cannot prevent torque shock from the rear end of the transmission or from the wheel end to the clutch or motor due to limitations in the arrangement position of the clutch mechanism in the vehicle driveline, and many vehicles eliminate such torque limiters due to space and cost issues. Disclosure of Invention Accordingly, it is a technical problem to be solved by the present invention to provide an improved torque limiter. The above technical problem is solved by a torque limiter according to the present invention. The torque limiter includes: an outer rotating member and an inner rotating member mounted radially inward of the outer rotating member, the outer rotating member and the inner rotating member being rotatable about a common central axis, respectively; a plurality of contact plates, each contact plate including a pivot end and a free end opposite each other and being mounted to a radially inner side of the outer rotating member by a respective pivot end such that the free end of each contact plate is rotatable relative to the outer rotating member about a respective pivot axis, the plurality of contact plates being circumferentially distributed such that each contact plate is disposed adjacent the free end of one adjacent contact plate by a respective free end and is disposed adjacent the pivot end of another adjacent contact plate by a respective pivot end; a plurality of connection frames to which free ends of any two adjacent ones of the plurality of contact plates are respectively movably connected, and A plurality of elastic members, each elastic member being disposed between a corresponding link and the outer rotating member so as to apply an elastic force to the corresponding link to rotate the corresponding two adjacently disposed free ends closer to the central axis; Wherein the inner rotating member includes a plurality of protrusions distributed in a circumferential direction and protruding toward radially outer sides, respectively, the inner rotating member having a first rotating position and a second rotating position with respect to the outer rotating member, in the first rotating position, each protrusion being aligned between a respective two adjacently disposed pivot ends, and in the second rotating position, each protrusion being aligned between a respective two adjacently disposed free ends, during rotation of the inner rotating member from the first rotating position to the second rotating position, each protrusion pushing the respective contact plate against the elastic force of the respective elastic member to thereby co-rotate the respective two adjacently disposed free ends away from the central axis through the respective connecting frame, such that the plurality of contact plates are capable of transmitting a torque within a predetermined range between the outer rotating member and the inner rotating member and allowing the inner rotating member to rotate beyond the second rotating position under a torque exceeding the predetermined range. The torque limiter may define the range of torque that can be transferred between the two rotating parts based on the amount of elastic force that the elastic member can provide. When the exceeding torque exceeds a predetermined maximum value, an "overrun" phenomenon occurs between the two rotating members, so that torque exceeding the maximum value cannot be transmitted. According to a preferred embodiment of the invention, the pivot axes of the plurality of touch pads may be respectively parallel to the central axis and have the same pitch relative to the central axis as each other. This means that the pivot axes of all the contact plates are distributed on the same positive circumferential line around the central axis. According to another preferred embodiment of the invention, the