DRIVESHAFT WITH A BELLOW IN SPLINE ASSEMBLY

Abstract

The invention relates to an elongated rotary slip stub (50); a tube sleeve (60) coaxially moving to the slip stub (50); a bearing assembly (20) mounted on the slip stub (50) with a roller (24) close to a movable end (64) of the tube sleeve (60); and a driveshaft comprising a bellow (10) fixed at a distal end (12) to the adjacent tube sleeve (60) from an outer periphery (62). The driveshaft comprises a retaining part (40) provided on the suspension devide (20) and holding the bellow (10) in the suspension devide (20) such that the bellow (10) are fixed directly to the suspension devide (20) from a proximal end (16).

Claims

1. A driveshaft comprising an elongated rotary slip stub; a tube sleeve telescopically engaged to the slip stub; a bearing assembly mounted on the slip stub by means of a roller at a vicinity of a movable end of the tube sleeve and a bellow secured to the adjacent tube sleeve from a distal end such that surrounding an outer periphery characterized in that a retaining part is provided on the bearing assembly and holding the bellow on the bearing assembly such that the bellow is secured directly to the bearing assembly from a proximal end.

2. The driveshaft according to claim 1, wherein a cover is extending radially outwardly from the slip stub covering the roller and having a groove on which the retaining part is mounted.

3. The driveshaft according to claim 2, wherein the cover is having S-shaped cross-section which forms the groove per se.

4. The driveshaft according to claim 2, wherein the retaining part is having a sleeve to engage in the groove from radially inwardly section.

5. The driveshaft according to claim 4, wherein a flange is extending radially outwardly from the sleeve and engaging the bearing assembly in a manner that presses the proximal end.

6. The driveshaft according to claim 5, wherein the proximal end is having an elbow section bent inwardly towards the flange.

7. The driveshaft according to claim 2, wherein a cover housing securing the roller is provided on a support element at a vicinity of the roller and into which the cover is mounted.

8. The driveshaft according to claim 2, wherein the movable end rests against a support wall of the cover in a closed position when the movable end of the tube sleeve is adjacent to the bearing assembly.

9. The driveshaft according to claim 8, wherein the travel distance is set equal to the stretching distance of the bellow in an open position when the movable end of the tube sleeve is spaced apart from the support wall.

10. The driveshaft according to claim 1, wherein the retaining part is made of at least partially by metal.

11. The driveshaft according to claim 1, wherein the bellow comprises an accordion-shaped folding part.

Description

DESCRIPTION OF THE FIGURES

[0017] FIG. 1 is a front view of a two-piece driveshaft comprising the bellow assembly according to the invention.

[0018] FIG. 2 is a partial cross-sectional illustration of a sliding assembly comprising a representative embodiment of the bellow assembly.

[0019] FIG. 3 is an enlarged illustration of the bellow assembly shown in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

[0020] In this detailed description, the development according to the invention is explained in no way with any limitation and only with reference to the examples for better illustrating the subject matter.

[0021] FIG. 1 shows a two-part representative embodiment of the driveshaft according to the invention. The driveshaft comprises a rear shaft (2) with a rear joint (5) and a front shaft (1) with a rotary connection by means of a yoke (4). A front joint (3) is provided on the front shaft (1), which includes a coaxial coupling. From the gearbox of a vehicle (not shown), the torque applied to the drive train and the coupling assembly is transmitted therefrom via the driveshaft to the rear shaft (not shown) via the rear joint (5).

[0022] In FIG. 2, a sliding tool on the driveshaft is shown in partial section by being zoomed in on a bearing assembly (20). Above the bearing assembly (20), a roller (24) is supported in a bearing (25) in a radial cavity structure in the middle of a flat upright support element (22). A slip stub (50) of the sliding tool coaxially passes with the roller (24) through the inner cavity of the roller (24). The suspension device (209 is suitably mounted from the top of a vehicle chassis base (not shown). A tube sleeve (60) is mounted on the slip stub (50) in an axially movable manner. A space is provided between the tube sleeve (60) and the slip stub (50) to allow movement. A bellow (10) is made of elastic material and is fixed between the tube sleeve 60 and the bearing assembly (20) at its opposite ends. The bellow (10) is attached to the bearing assembly (20) from a proximal end (16) of the tube sleeve (60) proximate the bearing assembly (20), at its opposite distal end (12) it is attached to a corresponding housing in an outer periphery (62) of the tube sleeve (60) by means of a connecting tab (11) in the form of a radially inwardly extending projection.

[0023] The bellow (10) have a folding part (14) of convoluted structure provided between the proximal end (16) and the distal end (12). The folding portion (14) is composed of a plurality of successive radial twisted portions of S-like cross-section close to each other in a folded position of the bellow (10). In the bearing (25) of the roller (24), a cover housing (21) is obtained with the distances left by the roller (24) from the edges.

[0024] The cover housing (21) is closed with a cover (30) that seals the lateral surfaces of the roller (24) in the channel (23) in such a way that the external dirt which will adversely affect the moving parts of the roller (24) does not reach the roller (24) or the bearing (25). The cover (30) is of a bent thin-walled plate structure and has an S-like cross-sectional form. Each cover housing (21) is closed by a cover (30), which is positioned in identical form but facing the opposite direction. The cover (30) is a S-shaped radial plate that is bent in the opposite S-shape on the outward-facing portion of the cover housing (21) in the portion facing the tube sleeve (60).

[0025] The cover (30) comprises a radially outwardly extending exterior edge (32) seated in a short channel (23) extending radially outwardly perpendicular to the bearing (25) on the outside of the support element (22). The cover (30) has a twisted portion at the lower end of the exterior edge (32) which forms a groove (34) which enters the bearing (25). The lower edge of the groove (34) forms a bearing wall (37) formed by a lower wall housing an interior (36) and a lower wall (38) in the opposite direction. The support wall (37) is vertically aligned with the outer edge of the support element (22). The bottom wall (38) sits on the slip stub (50) from the inner face surface.

[0026] In FIG. 3, the cover (30) is shown partially enlarged. Here, the retaining part (40) secured in the cover (30) is shown as having an L-like cross-sectional form. The retaining part (40), which is hidden in the forming part of the groove (34) of the cover (30), enables the bellow (10) to be secured to the cover (30) from its proximal end (16). At the proximal end (16) of the bellow (10), the bellow (10) are bent radially inward by an elbow section (18). Thus, an inwardly bent rear edge (17) is obtained. The rear edge (17) faces towards the hollow portion of the bellow (10). A form of flange (42) of the retaining part (40) rests against the rear edge (17) from the inside. On the other hand, a portion of the sleeve (44) connected to the flange (42) of the retaining part (40) fits into the interior part (36) by a tight fit. In the meantime, the bellow (10) reaches the closed position by leaning against the support wall (37) from the movable end (64) of the tube sleeve (60).

[0027] During operation of the driveshaft, the tube sleeve (60) advances on the slip stub (50). In the meantime, the bellow (10) is opened from the folding part (14) and extends axially. During elongation, the proximal end (16) forms a tension on the flange (42) from its rear edge (17) in the direction of drawing. The flange (42) ensures that the proximal end (169 remains still in the groove (34). The connecting tab (11) communicates with the outer periphery (62) at the distal end (12) of the bellow (10). Thus, if the movable end (64) of the tube sleeve (60) moves away from the bearing assembly (20) and travels on the slip stub (50), the bellow (30) prevents the entrance of the peripheral foreign elements from the opening of the slide shaft (50) from the slide sleeve (60). When the tube sleeve (60) advances from the movable end (64) towards the cover (30), the movable end (64) rests against the support wall (37).

TABLE-US-00001 REFERANCE NUMBERS 1 Front Shaft 2 Rear Shaft 3 Front Joint 4 Yoke 5 Rear Joint 10 Bellow 11 Connecting Tab 12 Distal End 14 Folding Part 16 Proximal End 17 Rear Edge 18 Elbow section 20 Bearing assembly 21 Cover housing 22 Support Element 23 Channel 24 Roller 25 Bearing 30 Cover 32 Exterior Edge 34 Groove 35 Rear Wall 36 Interior Part 37 Support wall 38 Bottom Wall 40 Retaining part 42 Flange 44 Sleeve 50 Slip Stub 60 Tube Sleeve 62 Outer periphery 64 Movable End