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EP-4741223-A1 - HOUSING FOR A SPINDLE TRANSMISSION AND SPINDLE TRANSMISSION

EP4741223A1EP 4741223 A1EP4741223 A1EP 4741223A1EP-4741223-A1

Abstract

Housing (32) for a spindle drive (14), with • a spindle axis (34), • two nut bearing seats (48) for arranging a spindle nut bearing (50) each, • two opposing end walls (52) that each intersect the spindle axis (34), • at least one side wall (60) aligned along the spindle axis (34), and • a worm shaft (36) arranged at an angle to the spindle axis (34), wherein the spindle axis (34) is arranged in an imaginary spindle plane (62) arranged parallel to the worm axis (36), and the at least one side wall (60) has at least one rib (68, 74, 80, 94) for stiffening the housing (32), and Spindle gear (14) with a housing (32).

Inventors

  • Fuchs, Gabriel
  • Rettenmeier, Patrick
  • WEINERT, JOHANNES
  • Hengstler, Manuel

Assignees

  • IMS Gear SE & Co. KGaA

Dates

Publication Date
20260513
Application Date
20241111

Claims (15)

  1. Housing (32) for a spindle drive (14), with • a spindle axis (34), • two nut bearing seats (48) for arranging a spindle nut bearing (50) each, • two opposing end walls (52) that each intersect the spindle axis (34), • at least one side wall (60) aligned along the spindle axis (34), and • a worm shaft (36) arranged at an angle to the spindle shaft (34), wherein the spindle shaft (34) is arranged in an imaginary spindle plane (62) arranged parallel to the worm shaft (36), where • each of the mother bearing seats (48) is assigned to one of the end walls (52), and • each of the end walls (52) has a support section (58) for supporting the housing (32) on a gearbox mount (12), characterized by the fact that which has at least one side wall (60) and at least one rib (68, 74, 80, 94) for stiffening the housing (32).
  2. Housing according to claim 1, characterized in that at least one outer rib (68, 74, 80) of the at least one rib (68, 74, 80, 94) is arranged, preferably exclusively, on an outer side (75) of the side wall (60).
  3. Housing according to claim 2, characterized by the fact that , the at least one outer rib (68, 74, 80) is arranged with respect to the spindle plane (62), preferably exclusively on the side of the screw axis (36).
  4. Housing according to one of claims 2 to 3, characterized by the fact that at least one first rib (68) of the at least one outer rib (68, 74, 80) is oriented from the support section (58) of one of the end walls (52) to that of the opposite end walls (52) of the nut bearing seats (48).
  5. Housing according to one of claims 2 to 4, characterized in that at least a second rib (74) of the at least one outer rib (68, 74, 80) is oriented from the worm shaft (36) towards one of the nut bearing seats (48).
  6. Housing according to one of claims 2 to 5, characterized by the fact that a third rib (80) that at least partially surrounds the worm shaft (36) and at least one outer rib (68, 74, 80).
  7. Housing according to claim 6, characterized by the fact that the at least one first rib (68) is arranged tangentially to the third rib (80).
  8. Housing according to one of the preceding claims, characterized by the fact that Each of the end walls (52) has a passage section (54) with an opening (56) arranged around the spindle axis (34) for the passage of a spindle, wherein the support section (58) is designed differently from the passage section (54) and is inclined relative to the passage section (54) by a support angle (84) to a housing interior (86) of the housing (32).
  9. Housing according to one of the preceding claims, characterized by the fact that the housing (32) has a housing end (88) facing away from the support section (58) with external housing corners (90) with respect to the spindle plane (62), wherein the housing corners (90) are designed as projections.
  10. Housing according to one of the preceding claims, characterized by the fact that at least one inner rib (94) of the at least one rib (68, 74, 80, 94) is arranged on one side on an inner side (95) of the at least one side wall (60) and on the other side on a bottom wall (66) of the housing (32).
  11. Housing according to claim 10, characterized by the fact that the housing (32) has a recess (96) between the at least one inner rib (94) and at least one of the nut bearing seats (48).
  12. Housing according to the preamble of claim 1 or any of the preceding claims, characterized in that the housing (32) is divided, preferably along the spindle axis (34), such that the housing (32) has a separate first housing part (38) and a separate second housing part (40), wherein • each of the mother bearing seats (48) has a first mother bearing seat part (100) which is arranged in the first housing part (38), • an imaginary longitudinal bearing plane (104) is arranged parallel to the at least one side wall (60) and extending through the spindle axis (34), and • the first mother bearing seat part (100) has at least one opening section (106) in the area of the bearing longitudinal plane (104) in which the first mother bearing seat part (100) opens radially towards the second housing part (40).
  13. Spindle gear (14) comprising • a spindle nut (24) with a spindle nut longitudinal axis (26), • a snail (28) with a snail longitudinal axis (30), and • a housing (32) according to one of the preceding claims, where • the spindle nut (24) is arranged in the housing (32) such that the longitudinal axis (26) of the spindle nut coincides with the spindle axis (34) of the housing (32), and • the screw (28) is arranged in the housing (32) such that the screw longitudinal axis (30) with the worm shaft (36) of the housing (32) coincides.
  14. Spindle drive (14), in particular according to claim 13, with a housing (32) according to claim 12, wherein the spindle drive (14) has at least one spindle nut bearing (50) arranged in each of the nut bearing seats (48), wherein the at least one spindle nut bearing (50) has at least one wedge section (112) extending along the at least one opening section (106).
  15. Spindle gear according to claim 14, characterized by the fact that the at least one wedge section (112) has a stop surface (114) which is arranged adjacent to a bearing stop (116) of the second housing part (40).

Description

The invention relates to a housing for a spindle drive and a spindle drive. For the electrically motorized longitudinal adjustment of seats in a motor vehicle, seat longitudinal adjustment devices are frequently used. These devices typically incorporate a spindle drive, which transmits speed and torque between a worm gear and a spindle. A spindle nut is mounted on the spindle, which in turn has a toothed ring with external teeth that meshes with the worm gear. Such spindle drives are used, for example, in... EP 1 992 842 B1 , the DE 103 62 040 B4 or the KR 10 1 920 222 B1 known. As can be seen in particular from the two documents EP 1 992 842 B1 and DE 103 62 040 B4 As can be seen, the spindle drives for use in a seat longitudinal adjustment device can be arranged in a U-shaped gear holder. The gear holder can in turn be coupled to the seat to be adjusted. When spindle drives are used for longitudinal seat adjustment in the direction of travel of a motor vehicle, the spindle drive is subjected to high forces, particularly in the event of a frontal collision. A highly relevant load case for the design of such spindle drives is therefore the so-called crash case. This assumes that the spindle, engaged with the spindle nut, is stationary while a defined force acts on the drive bracket in the direction of the seat's movement. The aim is to design the spindle drive in such a way that, especially in the upper In the described scenario of a frontal impact, the seat is held back as far as possible for as long as possible. The spindle drive is intended to counteract forward movement of the seat as effectively as possible. Holding the seat back for as long as possible is particularly necessary to ensure sufficient time for airbag deployment in a crash. Known spindle drives often fail to meet this requirement to the desired extent, especially since the gearbox housing tends to break prematurely in a crash. The invention is based on the objective of providing an arrangement by means of which a spindle drive can counteract a forward displacement of the seat as effectively as possible in the event of a crash. The problem is solved according to the invention by a housing for a spindle drive with the features of claim 1, a spindle drive with the features of claim 13 and a spindle drive with the features of claim 14. Advantageous embodiments and further developments of the invention are specified in the dependent claims. A housing according to the invention for a spindle drive comprises a spindle shaft, two nut bearing seats arranged around the spindle shaft for each mounting a spindle nut bearing, and two opposing end walls that each intersect the spindle shaft. Each of the end walls is preferably arranged at least partially perpendicular to the spindle shaft. The housing further comprises at least one side wall aligned along the spindle axis. Preferably, the at least one side wall is arranged parallel to the spindle axis. The housing also comprises a worm shaft arranged at an angle to the spindle axis, the spindle axis being located in an imaginary spindle plane parallel to the worm shaft. Unless otherwise specified, the term "angled" here and in the following preferably expresses that the axes in question neither intersect nor are parallel to each other. Preferably, the spindle axis and the worm shaft are arranged at right angles to each other. Each of the bearing seats is associated with one of the end walls. Thus, each bearing seat can be positioned closer to one end wall than the other. Preferably, each bearing seat is located adjacent to one of the end walls. Particularly preferably, each bearing seat is located adjacent to an inner surface of the corresponding end wall. Furthermore, each end wall has a support section for supporting the housing against a gearbox mount. The housing can further include at least one worm bearing seat arranged around the worm axis for accommodating a worm bearing. The at least one side wall has at least one rib for stiffening the housing. This counteracts deformation of the housing in the event of a crash. The at least one rib can be integrally formed with the housing. In one embodiment of the invention, the housing can be divided, such that the housing is a separate The housing comprises a first housing part and a separate second housing part, wherein the first housing part and the second housing part are preferably positively and/or materially connected to each other. In particular, the housing may be divided along the spindle axis. The at least one rib can, in particular, counteract the spreading apart of the two housing parts in the event of a crash. Preferably, at least one outer rib of the at least one rib is arranged, preferably exclusively, on an outer side of the side wall. Unless otherwise specified, the outer side is here and in the following preferably defined as a side of a wall facing the environment of the housing. Similarly, the inner side is here and in the following