Search

CN-122014827-A - Gear assembly, transmission and adjusting device for motor vehicle

CN122014827ACN 122014827 ACN122014827 ACN 122014827ACN-122014827-A

Abstract

A gear assembly (10) comprising a gear (14) and at least one catch disk (30, 32) having a substantially annular catch surface (54), wherein the gear (14) has a rotational axis (16) and a toothing (18) arranged around the rotational axis (16), wherein the toothing (18) is provided with alternately arranged teeth (22) and tooth gaps (24) in a circumferential direction (20) around the rotational axis (16), wherein the toothing (18) has at least one axial end side (34, 36) having a groove (38) extending around the rotational axis (16), wherein the at least one catch disk (30, 32) has at least one disk projection (56) protruding radially above the catch surface (54) and is arranged in the groove (38) in such a way that the at least one disk projection (56) engages radially in one of the tooth gaps (24), respectively, and a transmission (72) having the gear assembly (10) and an adjustment device for a motor vehicle, in particular for a seat adjustment device for a motor vehicle.

Inventors

  • GABRIEL FUCHS
  • Manuel Henschel
  • Johannes Vernet

Assignees

  • 亿迈齿轮两合股份公司

Dates

Publication Date
20260512
Application Date
20251107
Priority Date
20241111

Claims (15)

  1. 1. A gear assembly (10) comprising a gear (14) and at least one stop disk (30, 32) having a substantially annular stop surface (54), wherein the gear (14) has a rotational axis (16) and teeth (18) arranged around the rotational axis (16), the teeth (18) being provided with alternately arranged teeth (22) and tooth gaps (24) in a circumferential direction (20) around the rotational axis (16), wherein the teeth (18) have at least one axial end side (34, 36), the axial end sides (34, 36) having grooves (38) extending around the rotational axis (16), It is characterized in that the method comprises the steps of, The at least one stop disk (30, 32) has at least one disk projection (56) projecting radially with respect to the stop surface (54) and is arranged in the recess (38) in such a way that the at least one disk projection (56) engages radially in one of the tooth gaps (24) in each case.
  2. 2. The gear assembly (10) according to claim 1, It is characterized in that the method comprises the steps of, The at least one end face (34, 36) has at least one shoulder (48) which radially delimits the recess (38).
  3. 3. The gear assembly (10) according to claim 2, It is characterized in that the method comprises the steps of, The at least one shoulder (48) has a shoulder diameter (49), wherein the shoulder diameter (49) is configured to be smaller than a head circle diameter (44) of the tooth (18) and larger than a root circle diameter (46) of the tooth (18).
  4. 4. A gear assembly (10) according to any one of claims 2 to 3, It is characterized in that the method comprises the steps of, The at least one shoulder (48) is arranged to define the groove (38) radially inwards and/or to define the groove (38) radially outwards.
  5. 5. The gear assembly (10) according to any one of claims 2 to 4, It is characterized in that the method comprises the steps of, The tooth (18) has a tooth height (50) and the at least one shoulder (48) has a shoulder height (52), wherein the ratio of the shoulder height (52) to the tooth height (50) is 0.05 to 0.3, preferably 0.05 to 0.15.
  6. 6. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, The gear wheel (14) and the at least one locking disk (30, 32) are only connected in a form-locking manner.
  7. 7. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, The projection profile (64) of the at least one disk projection (56) is at least partially mathematically similar to the gap profile (66) of one of the teeth (24).
  8. 8. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, The at least one stopper disk (30, 32) has a plurality of disk protrusions (56).
  9. 9. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, The gearwheel (14) has at least one radial bearing seat (68) which is arranged axially adjacent to the toothing (18).
  10. 10. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, The gear (14) is designed as a spindle nut (12).
  11. 11. The gear assembly (10) according to any of the preceding claims, It is characterized in that the method comprises the steps of, A first stop disk (30) of the at least one stop disk (30, 32) is arranged on a first end side (34) of the at least one end side (34, 36), and a second stop disk (32) of the at least one stop disk (30, 32) is arranged on a second end side (36) of the at least one end side (34, 36), wherein the second end side (36) is axially opposite the first end side (34).
  12. 12. Transmission (72), in particular an adjustment device for a motor vehicle, comprising a gear assembly (10) according to any one of the preceding claims.
  13. 13. The transmission (72) according to claim 12, It is characterized in that the method comprises the steps of, The transmission (72) has at least one sliding bearing (76), wherein the at least one sliding bearing (76) has an axial bearing portion (78) which is configured to axially abut the stop surface (54) of the at least one stop disk (30, 32).
  14. 14. The transmission (72) according to any one of claims 12 to 13, wherein the gear assembly is configured according to claim 9, It is characterized in that the method comprises the steps of, The at least one sliding bearing (76) has a radial bearing portion (82) at right angles to the axial bearing portion (78), wherein the radial bearing portion (82) is configured to abut the radial bearing seat (68), and wherein, An axial inner diameter (84) of the axial bearing portion (78) is greater than or equal to a stop surface inner diameter (86) of the stop surface (54), and/or An axial outer diameter (88) of the axial bearing portion (78) is less than or equal to a stop surface outer diameter (90) of the stop surface (54).
  15. 15. An adjustment device for a motor vehicle, in particular for a motor vehicle seat, comprising a transmission (72) according to any one of claims 12 to 14.

Description

Gear assembly, transmission and adjusting device for motor vehicle Technical Field The invention relates to a gear assembly, a transmission having such a gear assembly and an adjusting device for a motor vehicle. Background Seat longitudinal adjustment devices are often used for electrically powered longitudinal adjustment of a seat of a motor vehicle. The seat longitudinal adjustment generally has a spindle drive, via which rotational speed and torque are transmitted between the drive worm and the drive spindle. For this purpose, a spindle nut is provided on the transmission spindle, which spindle nut in turn has a ring gear with external toothing for engagement with the transmission worm. For supporting the spindle nut, a plain bearing is generally used, which is arranged on a bearing seat of the spindle nut arranged axially adjacent to the external toothing system. In particular, when the external tooth part is configured as a helical tooth, it is necessary to provide proper support for the spindle nut in the axial direction in consideration of the generated axial force. It is therefore necessary to provide an axial stop surface on the spindle nut which is configured to make sliding contact with the slide bearing. In order to provide such a stop surface on the axial end face of the external toothing, it is known to cover the axially open external toothing with a stop disk. In order for a sliding contact to be established between the sliding bearing and the catch disk, the catch disk must be arranged in a rotationally fixed manner on the spindle nut. While preventing rotation of the stop disc relative to the spindle nut, various solutions are known. For example, DE102013207665A1 suggests press fitting a stop disk onto a spindle nut. However, this has the disadvantage that the press-fitting process may lead to chip generation and deformation of the stopper disk. Both of these conditions may lead to premature failure of the transmission. It is known from KR101920222B1 to provide a stop disk with an axial projection which can engage in the axial direction between two teeth of the external toothing. A disadvantage of this solution is that the manufacture of the stopper disc is relatively complex. The stop disk shown in DE10362040B4 has a radial projection which is bent in the axial direction after the stop disk has been arranged on the spindle nut, so that it is possible to engage between two teeth of the external toothing in the axial direction. A disadvantage of this system is that it requires an additional manufacturing step to bend the radial projections when arranging the stop disc on the spindle nut. Disclosure of Invention It is therefore an object of the present invention to provide a gear assembly such that a stop disc can be arranged simply and reliably on the end side of a tooth. The object of the invention is also to provide a corresponding transmission and a corresponding adjustment device for a motor vehicle. According to the invention, these objects are achieved by a gear assembly having the features of patent claim 1, a transmission having the features of patent claim 12 and an adjusting device having the features of patent claim 15. Advantageous embodiments and developments of the invention are specified in the dependent claims. The gear assembly according to the invention comprises a gear and at least one stop disc with a substantially annular stop surface, wherein the gear has a rotational axis and teeth arranged around the rotational axis, which teeth are provided with alternately arranged teeth and tooth gaps in a circumferential direction around the rotational axis, wherein the teeth have at least one axial end side with grooves extending around the rotational axis. Thus, each tooth may have a first portion and a second portion disposed axially rearward relative to the first portion. The teeth are preferably radially bounded on one side by the root circle diameter and on the other side by the head circle diameter. Thus, the groove may be divided by the tooth gap. Preferably, the teeth are configured as external teeth, which are preferably defined radially outwardly by a head circle diameter and radially inwardly by a root circle diameter. The terms "radial" and "axial" are used herein and hereinafter with respect to the axis of rotation, unless otherwise indicated. According to the invention, the at least one stop disk has at least one disk projection projecting radially relative to the stop surface and is arranged in the recess in such a way that the at least one disk projection engages radially in a respective tooth gap. The at least one catch disk can thus be produced in a simple manner and can be arranged fixedly on the gearwheel in the production step in order to prevent torsion. Thus, the at least one stop disc may be arranged on the gear in such a way that the at least one disc protrusion is supported on the tooth side radially adjacent to the groove. No additional fastening means