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DE-102016102639-B4 - Rotary transmission arrangement, device for converting a rotary motion into a linear motion and motor

DE102016102639B4DE 102016102639 B4DE102016102639 B4DE 102016102639B4DE-102016102639-B4

Abstract

Rotary transmission arrangement (10) comprising: a housing (1) having a bearing surface (11) which carries at least one bearing (4); a hollow shaft (2) which is/will be rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); a rod link (3) which is/will be rotatably coupled to the housing (1) about the first axis of rotation (A1), comprising at least one contact section (31) and at least one projecting part (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting part (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction; wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably against the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) abuts at least a part of the at least one outer stepped shaft section (21A) in an axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; and a stop member (5) which is/will be fixed to the rod member (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction.

Inventors

  • Kaisuke Fukunaga

Assignees

  • NIDEC CORPORATION

Dates

Publication Date
20260513
Application Date
20160215
Priority Date
20151104

Claims (14)

  1. Rotary transmission arrangement (10) comprising: a housing (1) having a bearing surface (11) which supports at least one bearing (4); a hollow shaft (2) which is rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); a rod link (3) which is rotatably coupled to the housing (1) about the first axis of rotation (A1), having at least one contact section (31) and at least one projecting part (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting part (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction; wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably on the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) is connected to at least a part of the at least one outer circular support part (42). stepped shaft section (21A) abuts in an axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; and a stop member (5) which is/will be fixed to the rod member (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction.
  2. Rotary transmission arrangement (10) according to Claim 1 , further comprising: a circular bearing retaining member (6) which is/will be fixed to an inner surface (12a) of an opening section (12) of the housing (1) and is designed to abut at least a part of the at least one circular outer support part (42) in the axial direction.
  3. Rotary transmission arrangement (10) according to Claim 2 , in which the outer diameter of the circular bearing retainer (6) is larger in a radial direction than an outer diameter of the at least one circular outer support part (42).
  4. Rotary transmission arrangement (10) according to Claim 2 or 3 , in which the circular bearing retainer (6) comprises at least one sealing element.
  5. Rotary transmission arrangement (10) according to one of the Claims 2 until 4 , in which at least part of the circular bearing retainer (6) is pressed onto at least part of the opening section (12) and a deformed section is formed.
  6. Rotary transmission arrangement (10) according to one of the Claims 2 until 5 , wherein the circular bearing retainer (6) has a concave section (61A) on an upper surface (61) of the circular bearing retainer (6) and a convex section (62A) on a lower surface (62) of the circular bearing retainer (6), wherein the concave section (61A) has a tool engagement hole (63).
  7. Rotary transmission arrangement (10) according to Claim 6 , in which the convex section (62A) is arranged on the lower surface (62) of the circular bearing retainer (6) in the deeper area than the deformed section in the axial direction.
  8. Rotary transmission arrangement (10) according to one of the Claims 1 until 7 , wherein the housing (1) has at least one stepped housing section (13), wherein the at least one bearing (4) is arranged where an axial end surface of the at least one bearing (4) is positioned between the outer surface of the at least one stepped housing section (13) and the inner surface of the at least one stepped housing section (13).
  9. Rotary transmission arrangement (10) according to one of the Claims 1 until 8 , in which at least one bearing (4) is a four-point contact bearing, wherein the circular inner support part (41A, 41B) has a lower inner support part (41A) abutting the at least one outer stepped shaft section (21A) and an upper inner support part (41B) abutting the stop member (5).
  10. Rotary transmission arrangement (10) according to one of the Claims 1 until 9 , in which at least one section of the hollow shaft (2) corresponds to the shape of at least one contact section (31) of the rod link (3).
  11. Rotary transmission arrangement (10) according to one of the Claims 1 until 10 , in which at least one contact section (31) of the rod member (3) has a shape different from a circular shape.
  12. Device (100) for converting a rotary motion into a linear motion, comprising: a housing (1) having a bearing surface (11) which supports at least one bearing (4); a stator (7) with several coils (71) arranged in a circumferential direction, wherein the stator (7) is/will be arranged on a cylindrical section (14) of the housing (1); a hollow shaft (2) which is/will be rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); several magnets (8) which are arranged on an external circumferential surface (23) of the hollow shaft (2) inwards from the stator (7) in a radial direction; a rod link (3) which is/will be rotatably coupled to the housing (1) about the first axis of rotation (A1), comprising at least one contact section (31) and at least one projecting section (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting section (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction; wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably to the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) abuts at least a part of the at least one outer stepped shaft section (21A) abuts in the axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; a stop member (5) which is/will be fixed to the rod member (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction; and a ball nut (9) which is/will be rotatably supported on spiral grooves (33) on an outer circumferential periphery of the rod member (3), wherein the ball nut (9) moves in the axial direction of the first axis of rotation (A1) according to the rotation of the rod member (3).
  13. Motor (200) comprising a device (100) for converting a rotary motion into a linear motion according to Claim 12 and/or a rotary transmission arrangement according to one of the Claims 1 until 11 .
  14. Engine (200) after Claim 13 , in which the motor is designed as a brake system motor.

Description

The invention essentially relates to a rotary transmission arrangement, a device for converting a rotary motion into a linear motion, and a motor. More specifically, the present invention relates to a rotary transmission arrangement, a device for converting a rotary motion into a linear motion, and a motor, which provide a secure positioning of axially and radially stressed components in an axial and a radial direction. A known device type for converting the rotary motion of a motor into a linear motion includes a conventional ball nut for transmitting the rotary motion of a rod link into a linear motion, wherein the ball nut is movably arranged on the rod link. Since the ball nut moves back and forth on the rod link, the bearings supporting the rod link relative to a housing are subjected to high axial and radial loads. An example of a device for converting a rotary motion into a linear motion is in the JP 4722247 B2 revealed. However, the JP 4722247 B2 a conventional bearing arrangement for rotary support of the rotating section on the stationary section (i.e. housing), whereby the components for supporting the rotating section on the stationary section can easily detach due to the high axial and radial load. US 6 349 801 B1 reveals an electromechanically actuated disc brake. One aspect of the present invention is to improve the secure positioning of loaded components in a rotary transmission arrangement in both axial and radial directions. Another aspect of the present invention is to reduce axial impact. A further aspect of the present invention is to prevent rod link movement in the axial direction of the rotary transmission arrangement. In consideration of the known technology and according to a first aspect of the present invention, a rotary transmission arrangement is provided, which essentially comprises a housing, a hollow shaft, a rod link or rod section, at least one bearing, and a stop element. The hollow shaft is rotatably coupled to the housing about a first axis of rotation. The hollow shaft has at least one outer stepped shaft section and at least one inner stepped shaft section. The rod link is rotatably coupled to the housing about the first axis of rotation, having at least one contact section and at least one projecting portion. The at least one contact section touches at least a portion of the hollow shaft in a radial direction, and the at least one projecting portion abuts or strikes the at least one inner stepped shaft section in a radial direction. The at least two contact points are preferably arranged close to each other, but they can also be spaced apart. The at least one bearing comprises at least one circular inner support section and at least one circular outer support section, which rotatably support the hollow shaft and the rod link to the housing about the first axis of rotation. The at least one circular inner support element abuts or strikes at least a portion of the at least one outer stepped shaft section in the axial direction, and the at least one circular outer support element abuts or strikes a bearing surface of the housing in the axial direction. The stop element is fixed to the rod element, with the stop element abutting or striking the at least one circular inner support element in the axial direction. Since the stop element accommodates at least one circular inner support part of the bearing, and at least one outer stepped shaft section accommodates the other circular inner support part of the bearing, the axial runout is reduced. This axial fixing arrangement further prevents movement of the rod link in an axial direction. Preferably, the rotary transmission arrangement further comprises a circular bearing retainer element which is fixed to an inner surface of an opening section of the housing and is designed to abut at least a portion of the at least one circular outer support element in the axial direction. This further enables secure fixing and positioning of the bearing in an axial direction. Preferably, the rotary transmission arrangement is designed such that the outer diameter of the circular bearing retainer is larger in a radial direction than the outer diameter of the at least one circular outer support element. This enables secure fixing and positioning of the bearing in an axial direction. Preferably, the rotary transmission arrangement is designed such that the circular bearing retainer includes at least one sealing element. This ensures a reliable seal. Preferably, the rotary transmission arrangement is designed such that the circular The bearing retainer is securely fixed to the inner surface of the opening section of the housing; in particular, at least part of the circular bearing retainer is pressed, squeezed, or crimped onto at least part of the opening section, and a deformed section is formed. Therefore, the circular bearing retainer securely locks the bearing. Preferably, the rotary transmission arrangement is configured such that the cir