RU2779549C1 - Cardan shaft with a diaphragm in the splined joint assembly - Google Patents

Abstract

FIELD: engine technology.

SUBSTANCE: invention relates to a cardan shaft with a diaphragm. The cardan shaft comprises an elongated rotating sliding rod, a tubular sleeve that is telescopically engaged with a sliding rod, a bearing assembly mounted on the sliding rod by means of a roller cage, and a diaphragm attached to the adjacent tubular sleeve from the distal end. The locking part is provided on the bearing assembly and holds the diaphragm on the bearing assembly in such a way that the diaphragm is attached directly to the bearing assembly from the proximal end.

EFFECT: reduction in the length of the diaphragm and the sliding rod of the cardan shaft with a splined joint is achieved.

11 cl, 3 dwg

Description

The field of technology to which the invention belongs

The present invention relates to cardan shafts containing a protective membrane on moving parts.

Prior Art

In vehicles, transmission means are used to transmit rotational energy from an engine or transmission components to rotate one or more wheels. Cardan shafts, as the most commonly used transmission, along with a cardan joint, contain an intermediate bearing and a cardan shaft yoke and provide a smooth transmission of driving force, despite changes in the relative position between the front and rear parts of the vehicle. Due to the high transferable torque, cardan shafts are designed in such a way that they have high torsional rigidity and sufficient bending rigidity.

A suspension assembly is located in the cardan shaft between the front shaft and the rear shaft. A membrane is installed on the sliding shaft passing through the bearing assembly at one end near the bearing assembly. The membrane is mounted on the sliding rod on one side of the outer edge defining the bearing area near the bearing assembly of the sliding shaft. In the existing design, a gap is provided for connecting the membrane on the sliding shaft.

US Patent Publication US5961388A describes a diaphragm assembly used in a cardan shaft. A sliding fork of the cardan shaft and a part of the cardan shaft with a narrowed diameter are described. In the corrugated membrane structure, the sealing element protects the spline connection between the propeller shaft sliding yoke and the reduced diameter. Sliding fork of cardan shaft contains hollow cylindrical end part and part with fork. An annular groove is made on the outer surface of the tubular end of the sliding yoke of the cardan shaft in the direction opposite to the yoke of the cardan shaft.

Brief description of the invention

The purpose of the present invention is to shorten the length of the membrane and the sliding rod of the cardan shaft with a splined joint.

To achieve the above object, the present invention relates to a cardan shaft containing an elongated rotating sliding rod; a tubular sleeve in telescopic engagement with the sliding rod; a bearing assembly mounted on the sliding rod by means of a roller cage near the movable end of the tubular sleeve, and a membrane attached to the adjacent tubular sleeve from the distal end so as to cover the outer edge. The cardan shaft further comprises a locking portion which is provided on the bearing assembly and holds the membrane on the bearing assembly so that the membrane is attached directly to the bearing assembly from the proximal end. The stop portion secures the diaphragm to the bearing assembly, eliminating the need to provide an additional fitting on the shaft. The bearing assembly may be an intermediate bearing assembly between the front shaft and the rear shaft of the driveshaft and which secures the driveshaft to the vehicle, or may also be provided as a support element having a different function, which is attached to the shaft near the movable end of the sleeve on any part cardan shaft with a sliding rod and a tubular bushing. The membrane can be presented in the form of an elastic element made as a whole or divided into parts of a structure made of rubber or synthetic material.

In a preferred embodiment, a cover is provided which extends radially outward from the sliding rod, protects the roller cage, and has a groove on which the stop portion is mounted. Thus, the cover not only protects the bearing from dust and similar environmental factors, but also allows the diaphragm to be mounted on one side close to the bearing assembly.

In a preferred embodiment, the lid has an S-shaped cross section which substantially forms a groove. The S-shape provides high structural strength that resists both axial stresses applied to the groove and radial vibrations from the shaft.

In a preferred embodiment, the stop portion has a sleeve for engagement in a groove with the radially inward portion. The bushing provides an easy and secure installation of the locking part in the groove on the cover. In an alternative embodiment, sealing elements or an additional ring for the sleeve can provide a tight installation of the folding part in the cavity.

In a preferred embodiment, the flange extends radially outward from the hub and engages the bearing assembly so as to press the proximal end. The flange helps to keep the membrane in the cavity after the membrane is installed in the cavity, depending on the corresponding end of the membrane from the inside with a fixing element.

In a preferred embodiment of the present invention, the proximal end has an elbow that curves inward towards the flange. The crank part provides attachment of the tubular membrane to the flange from the inner surface. The cranked part can be used in a single piece or in a series two-piece structure.

In a preferred embodiment, a protective housing is provided on the support element near the roller cage, holding the roller cage and into which the cover is mounted. Thus, it is possible to install the cover in the gaps remaining on both sides of the bearing in the support element in which the bearing is located in the bearing assembly.

In a preferred embodiment, the movable end rests against the support wall of the cap in the folded state when the movable end of the tubular sleeve abuts the bearing assembly. The supporting wall prevents the axial movement of the tubular sleeve in the direction of the bearing assembly. The support wall may be directly integrated with the cover or may be attached to the bearing assembly as a separate piece.

In a preferred embodiment, the stroke distance is chosen to be equal to the expansion distance of the membrane in the unfolded state, when the movable end of the tubular sleeve is at a distance from the support wall. Thus, the axial movement of the sliding tool prevents damage or rupture of the membrane.

In a preferred embodiment, the stop portion is at least partially made of metal. The metal material provides durable solutions to dampen vibrations and other external factors that the driveshaft will be exposed to.

In a preferred embodiment of the present invention, the membrane comprises an accordion-folding portion. The folding part ensures unfolding to the appropriate distance during axial translational movements. Thanks to the folding part, a compact membrane can be used.

Brief description of the drawings

In FIG. 1 is a front view of a two-part propeller shaft containing a diaphragm assembly according to the present invention.

In FIG. 2 is a partial sectional illustration of a sliding assembly containing an exemplary embodiment of a membrane assembly.

In FIG. 3 is an enlarged illustration of the membrane assembly shown in FIG. 2.

Detailed description of the invention

In this detailed description, the design according to the present invention is not explained in any way with the application of any limitations, but only with reference to examples to better explain the subject of the present invention.

In FIG. 1 shows an exemplary embodiment of a cardan shaft, consisting of two main parts, according to the present invention. The cardan shaft contains a rear shaft (2) with a rear hinge (5) and a front shaft (1) with a joint rotating by means of a yoke (4) of the cardan shaft. On the front shaft (1) there is a front hinge (3), which contains a coaxial connection. The torque from the vehicle gearbox (not shown) applied to the transmission and the torque transmission unit is transmitted from them through the rear joint (5) to the rear shaft (not shown) by means of the cardan shaft.

In FIG. 2 shows the sliding tool on the cardan shaft with a partial section enlarged on the bearing assembly (20). Above the bearing assembly (20), the roller cage (24) is supported in the bearing (25) in a radial cavity structure in the middle of the flat vertical support member (22). The sliding rod (50) of the sliding tool passes coaxially with the roller cage (24) through the inner cavity of the roller cage (24). The hanger (20) is properly installed on the top side of the vehicle chassis base (not shown). The tubular sleeve (60) is mounted on the sliding rod (50) in a way that allows movement in the axial direction. A gap is provided between the tubular sleeve (60) and the sliding rod (50) to allow movement. The membrane (10) is made of an elastic material and is fixed between the tubular bushing (60) and the bearing assembly (20) at its opposite ends. The membrane (10) is attached to the bearing assembly (20) from the proximal end (16) of the tubular sleeve (60), proximal to the bearing assembly (20), while at its opposite distal end (12) it is attached to the corresponding housing on the outer edge ( 62) of a tubular sleeve (60) by means of a connecting protrusion (11) in the form of a protruding part extending in the radial direction to the inside.

The membrane (10) contains a folding part (14) of a corrugated structure located between the proximal end (16) and the distal end (12). The folding part (14) is composed of a plurality of successive radially bent parts having an S-shaped cross section close to each other in the folded position of the membrane (10). In the bearing (25) of the roller cage (24), the protective housing (21) is made with distances left along the edges from the roller cage (24).

The protective housing (21) is closed with a cover (30), which ensures the tightness of the side surfaces of the roller cage (24) in the groove (23) in such a way that dirt entering from the outside, which will adversely affect the moving parts of the roller cage (24), does not get into on the roller cage (24) or bearing (25). The cover (30) is a curved thin-walled plate structure and has an S-shaped cross section. Each protective housing (21) is closed by a cover (30) which is located identically but faces in the opposite direction. The cover (30) is an S-shaped radial plate that is bent into an opposite S-shape on the outward facing part of the protective housing (21) on the part facing the tubular sleeve (60).

The cover (30) has an outer edge (32) extending radially outward, located in a short groove (23) extending radially outward perpendicular to the bearing (25) on the outer side of the support element (22). The cover (30) has a curved portion at the lower end of the outer edge (32) that forms a groove (34) that fits into the bearing (25). The lower edge of the groove (34) forms a support wall (37) formed by the inner part (36) of the bottom wall of the housing and the bottom 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) is located on the sliding rod (50) from the inside of the front surface.

In FIG. 3 the cover (30) is shown partially enlarged. Meanwhile, the locking portion (40) fixed in the cover (30) is shown as having an L-shaped cross section. The locking part (40), which is hidden in the integral part of the groove (34) of the cover (30), ensures that the membrane (10) is attached to the cover (30) from its proximal end (16). At the proximal end (16) of the membrane (10), the membrane (10) bends in the radial direction inwards by the cranked part (18). Thus, an inwardly curved rear edge (17) is obtained. The rear edge (17) faces the hollow part of the membrane (10). The shape of the flange (42) of the locking part (40) rests on the rear edge (17) from the inside. On the other hand, the bushing part (44) connected to the flange (42) of the locking part (40) is installed into the inner part (36) by a tight fit. In this case, the membrane (10) reaches the folded state by resting on the support wall (37) from the movable end (64) of the tubular sleeve (60).

During operation of the cardan shaft, the tubular sleeve (60) moves forward on the sliding rod (50). In this case, the membrane (10) unfolds from the folding part (14) and passes in the axial direction. When elongated, the proximal end (16) pressurizes the flange (42) from its rear end (17) in the direction of the drawing. The flange (42) secures the proximal end (16) in the groove (34). The connecting protrusion (11) interacts with the outer edge (62) at the distal end (12) of the membrane (10). Thus, if the movable end (64) of the tubular sleeve (60) moves away from the bearing assembly (20) and pushes on the sliding rod (50), the membrane (10) prevents the outer peripheral elements from leaving the hole of the sliding shaft (50) from the sliding bushings (60). When the tubular sleeve (60) is translated from the movable end (64) to the cover (30), the movable end (64) rests on the support wall (37).

Reference positions

1 front shaft 30 Lid 2 Rear shaft 32 Outer edge 3 Front hinge 34 Groove 4 Cardan shaft yoke 35 Back wall 5 Rear hinge 36 Interior 10 Membrane 37 Retaining wall 11 Connecting lug 38 Bottom wall 12 Distal end 40 Locking part 14 Folding part 42 Flange 16 Proximal end 44 Bushing 17 Trailing edge 50 Sliding rod 18 Crank 60 Tubular sleeve 20 Bearing assembly 62 Outer edge 21 Protective case 64 Moving end 22 Support element 23 Paz 24 Roller cage 25 Bearing

Claims (11)

1. Cardan shaft containing: an elongated rotating sliding rod (50); a tubular sleeve (60) telescopically engaged with a sliding rod (50); bearing assembly (20) mounted on the sliding rod (50) by means of a roller cage (24) near the movable end (64) of the tubular sleeve (60), and the membrane (10) attached to the adjacent tubular sleeve (60) from the distal end (12 ) so as to encircle the outer edge (62), characterized in that the locking part (40) is provided on the bearing assembly (20) and holds the membrane (10) on the bearing assembly (20) in such a way that the membrane (10) is attached directly to the bearing assembly (20) from the proximal end (16). 2. Cardan shaft according to claim 1, characterized in that the cover (30) extends radially outward from the sliding rod (50), protects the roller cage (24) and has a groove (34) on which the locking part (40) is installed . 3. Cardan shaft according to claim 2, characterized in that the cover (30) has an S-shaped cross-section, which essentially forms a groove (34). 4. Cardan shaft according to claim 2 or 3, characterized in that the locking part (40) has a sleeve (44) for engagement in the groove (34) with the radially inward part. 5. Cardan shaft according to claim 4, characterized in that the flange (42) extends radially outward from the sleeve (44) and engages with the bearing assembly (20) so as to press the proximal end (16). 6. Cardan shaft according to claim 5, characterized in that the proximal end (16) has a cranked portion (18) bent inwards towards the flange (42). 7. Cardan shaft according to claims 2-6, characterized in that the protective housing (21) holding the roller cage (24) is provided on the support element (22) near the roller cage (24) and in which the cover (30) is installed. 8. Cardan shaft according to claims 2 to 7, characterized in that the movable end (64) rests on the support wall (37) of the cover (30) in the folded state, when the movable end (64) of the tubular sleeve (60) is adjacent to the bearing assembly (twenty). 9. Cardan shaft according to claim 8, characterized in that the stroke distance is chosen equal to the stretching distance of the membrane (10) in the unfolded state, when the movable end (64) of the tubular sleeve (60) is at a distance from the support wall (37). 10. Cardan shaft according to any one of the preceding claims, characterized in that the locking part (40) is made at least partially of metal. 11. Cardan shaft according to any one of the preceding claims, characterized in that the membrane (10) comprises a folding part (14) in the form of an accordion.

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