SPINDLE DRIVE

Abstract

A spindle drive for a motorized adjustment of an adjustment element of a motor vehicle includes a tubular or half-shell-like spindle drive housing. An annular or disk-like connection portion is inserted and secured in one end region of the spindle drive housing. The annular or disk-like connection portion is connected via a damping element comprising a resilient damping material to a connection for discharging axial drive movements. The connection portion has a coaxial recess with an inner radially peripheral wall having a radially peripheral groove. The connection with the end region thereof facing the spindle drive housing protrudes axially into the recess of the connection portion and has a radially peripheral flange which protrudes radially into the groove. The damping element is arranged in a gap disposed between the side walls of the groove and the side walls of the flange.

Claims

1. A spindle drive for a motorized adjustment of an adjustment element of a motor vehicle, comprising: a tubular or semi-shell-shaped spindle drive housing; an annular or disk-shaped connection portion inserted and secured in one end region of the spindle drive housing, the connection portion having a coaxial recess with a radially peripheral groove in an inner radially peripheral wall thereof, the radially peripheral groove having side walls and a base; a connection for discharging axial drive movements to the adjustment element, the connection being connected to the connection portion with a damping element comprising a resilient damping material between at least a portion of the connection and at least a portion of the connection portion, wherein an end region of the connection facing the spindle drive housing protrudes axially into the recess of the connection portion and has a radially peripheral flange that protrudes radially into the radially peripheral groove of the connection portion, and at least a first portion of the damping element is disposed in a gap is between the side walls of the groove and side walls of the flange.

2. The spindle drive according to claim 1, wherein a second portion of the damping element is disposed in a second gap between the base of the groove and an outer radially peripheral face of the flange.

3. The spindle drive according to claim 1, wherein the flange has a cross section that tapers radially outward in a conical or partially conical manner and the groove has a corresponding cross section.

4. The spindle drive according to claim 1, wherein the connection portion has an outer end side facing away from the spindle drive housing and the connection has a support flange axially opposite the outer end side of the connection portion, wherein a third portion of the damping element is provided in a third gap between the outer end side of the connection portion and the support flange.

5. The spindle drive according to claim 1, wherein the damping element comprises a plastics material sprayed onto or into the gap or gaps between the connection portion and the connection.

6. The spindle drive according to claim 1, wherein the damping element is a prefabricated damping element which is vulcanized onto the contour of the flange or the contour of the groove.

7. The spindle drive according to claim 4, wherein the damping element is a prefabricated damping element which is vulcanized onto the contour of the flange and the support flange or the contour of the groove and the end face of the connection portion.

8. The spindle drive according to claim 1, wherein the annular or disk-like connection portion comprises two or more annular or disk-like segments.

9. The spindle drive according to claim 8, wherein the two or more annular or disk-like segments are the same two or more annular or disk-like segments.

10. The spindle drive according to claim 1, wherein the connection portion is connected to the tubular spindle drive housing in a positive-locking manner.

11. The spindle drive according to claim 10, wherein the connection portion is radially flanged to the spindle drive housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] An embodiment of the invention is illustrated in the drawings and is described in greater detail below. In the drawings:

[0022] FIG. 1 is a longitudinal section of an end region of a spindle drive of FIG. 4,

[0023] FIG. 2 is a side view of the connection portion/connection sub-assembly of the spindle drive according to FIG. 1,

[0024] FIG. 3 is a longitudinal section of the sub-assembly according to FIG. 2, and

[0025] FIG. 4 is a schematic view of the spindle drive connected to an adjustment element according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] As shown in FIG. 4, a spindle drive 100 according to an embodiment is connected to an adjustment element 120 in the form of a flap such as, for example, a trunk lid or hatch lid of a motor vehicle. The spindle drive illustrated in the FIGS. 1-3 has a tubular spindle drive housing 1 in which a motorized drive 2 of the spindle drive is arranged.

[0027] There is inserted into an end region of the spindle drive housing 1 an annular connection portion 4 which is formed from two identical annular segments 3, 3′ and which has the same outer diameter as the inner diameter of the spindle drive housing 1 and which has a radially peripheral annular groove 6 at the outer radially peripheral cylindrical covering face 5. The material of the spindle drive housing 1 which comprises metal is deformed inward into the annular groove 6 by means of radial deformation and the connection portion 4 is thus securely connected to the spindle drive housing 1.

[0028] The connection portion 4 has a coaxial recess 7 which has a radially peripheral annular groove 8 in the inner radially peripheral cylindrical wall thereof.

[0029] A ball socket pin 9 of a ball joint which is constructed as an angle joint and which forms a connection 10 protrudes into the recess 7. A ball socket 11 is arranged at the end of the ball socket pin 9 opposite the recess 7.

[0030] In the region of the ball socket pin 9 which protrudes into the recess 7 there is arranged a flange 12 which protrudes radially into the groove 8 in such a manner that first gaps 13 are formed between the side walls of the flange 12 and the side walls of the groove 8. Furthermore, a second gap 14 of approximately the same width as the first gaps 13 is formed between the base of the groove 8 and the radially peripheral outer face of the flange 12.

[0031] The flange 12 has a cross section which tapers radially outward and the groove 8 has a corresponding cross section.

[0032] The gaps 13 and 14 formed between the flange 12 and the groove 8 are filled with a resilient damping material 15.

[0033] At the connection side, the groove 8 is adjoined by a radially inwardly directed annular attachment 16 of the connection portion 4, the side of which directed toward the ball socket 11 forms an outer end side 17 of the connection portion 4.

[0034] The ball socket pin 9 has a radially outwardly directed support flange 18 which extends over the end side 17. Between the end side 17 and the support flange 18 there is formed a third gap 19 which substantially corresponds in terms of its thickness to the gaps 13 and 14 and which also extends around the radially inner annular face of the annular attachment 16. This third gap 19 is also filled with a resilient damping material 15′.

[0035] The vibrations which are produced by the motorized drive 2 during operation of the spindle drive and which act on the spindle drive housing 1 and the connection portion 4 can be transmitted to the connection 10 and the adjustment element which is arranged thereon and which is not illustrated and can thereby produce disruptive noises only in a significantly reduced manner since they are insulated by the damping material 15, 15′ which forms a damping element 20.

[0036] The axial deformation of the damping material 15, 15′ is, however, limited in the event of both a tensile loading and a pressure loading of the connection 10 since it is axially limited and supported at both sides in the gaps 13, 14 and 19. Consequently, in particular an axial expansion of the damping material 15, 15′ is also limited so that fatigue of the damping material 15, 15′ and consequently the premature wear thereof do not occur.

LIST OF REFERENCE NUMERALS

[0037] 1 Spindle drive housing [0038] 2 Motorized drive [0039] 3 Annular segment [0040] 3′ Annular segment [0041] 4 Connection portion [0042] 5 Covering face [0043] 6 Annular groove [0044] 7 Recess [0045] 8 Groove [0046] 8 Ball socket pin [0047] 10 Connection [0048] 11 Ball socket [0049] 12 Flange [0050] 13 First gap [0051] 14 Second gap [0052] 15 Damping material [0053] 15′ Damping material [0054] 16 Annular attachment [0055] 17 Outer end side [0056] 18 Support flange [0057] 19 Third gap [0058] 20 Damping element