Telescopic cross universal joint

Abstract

The telescopic cross universal joint comprises a first joint fork, a second joint fork and a cross shaft, the first joint fork and the second joint fork are connected through the cross shaft, and the cross shaft is slidably connected with the first joint fork and the second joint fork so that the overall length of the cross universal joint can be telescopic. The telescopic cross universal joint is reasonable in design and high in practicability, displacement generated by axial movement is automatically supplemented through the telescopic overall length of the cross universal joint on the premise that torque is transmitted through different axes, and the application environment is greatly expanded.

Description

Technical Field

[0001] The invention relates to the field of universal joints, in particular to a telescopic cross universal joint. Background Art

[0002] As an important mechanical connector, the cross-axis universal joint is widely used to connect parts with different shaft axes and rotation directions. The traditional cross-axis universal joint is mainly composed of a cross shaft, a pair of yokes and two pairs of needle bearings, which can realize power transmission between two shafts at different angles.

[0003] However, most of the existing cross-axis universal joints are fixed and cannot achieve telescopic function, so they cannot compensate for the displacement caused by axial movement during power transmission. In addition, these fixed universal joints are not universal and are limited in application environment. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a telescopic cross universal joint which can automatically compensate for the displacement caused by axial movement by making the overall length telescopic while achieving the transmission of torque in different axial directions.

[0005] The present invention is implemented by the following scheme: a telescopic cross universal joint, including a first yoke, a second yoke and a cross shaft, wherein the first yoke and the second yoke are connected by the cross shaft, and the cross shaft is slidably connected to the first yoke and the second yoke to make the overall length of the cross universal joint telescopic.

[0006] Furthermore, long grooves are provided on both sides of the first yoke and the second yoke, and each shaft head of the cross shaft is movably connected to the corresponding long groove through a bearing.

[0007] Furthermore, the cross shaft includes two cross-intersecting shafts that are not in the same plane. The shaft body is a hollow structure and is penetrated by a pin shaft. Both ends of the shaft body are provided with bearings mounted on the pin shaft.

[0008] Furthermore, a head is provided at one end of the pin shaft and a retaining ring is provided at the other end, and the retaining ring is fixed to the tail end of the pin shaft by a pin which radially penetrates the retaining ring and the tail end of the pin shaft.

[0009] Furthermore, a circle of limiting grooves is provided on the inner side of the long groove, and a circle of raised parts cooperating with the limiting grooves is provided on the outer periphery of the bearing; and a circle of lubricating oil channels is also provided in the middle of the limiting grooves.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the retractable cross universal joint of the present invention is reasonably designed and highly practical. On the premise of transmitting torque along different axes, the overall length of the cross universal joint can be retracted to automatically compensate for the displacement caused by axial movement, thereby greatly expanding the applicable environment.

[0011] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a three-dimensional diagram of the cross universal joint structure of an embodiment of the present invention; Figure 2 This is a three-dimensional diagram of the cross-axis structure of an embodiment of the present invention; Explanation of the numbers in the figure: 1-first fork, 2-second fork, 3-cross shaft, 4-long groove, 5-bearing, 6-pin shaft, 7-retaining ring, 8-pin, 9-limiting groove, 10-raised part, 11-lubricating oil channel. DETAILED DESCRIPTION

[0013] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0014] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0015] like Figure 1~2 As shown, a telescopic cross universal joint comprises a first yoke 1, a second yoke 2 and a cross shaft 3, wherein the first yoke and the second yoke are connected via the cross shaft 3, and the cross shaft 3 is slidably connected to the first yoke 1 and the second yoke 2 so that the overall length of the cross universal joint can be telescopic. The telescopic cross universal joint of the present invention utilizes the slidable connection between the cross shaft and the yoke to make the distance between the two yokes adjustable, thereby realizing the telescopic overall length of the cross universal joint, aiming to solve the displacement problem caused by axial movement during power transmission of the traditional cross-axis universal joint. When the universal joint is working, the displacement caused by the axial movement can be compensated by automatic telescopic movement, which greatly expands the applicable environment.

[0016] In this embodiment, long grooves 4 are provided on both sides of the first yoke 1 and the second yoke 2, and each shaft head of the cross shaft is movably connected to the corresponding long groove through a bearing 5. The original round hole of the yoke is changed into a long groove, and a bearing is embedded in the long groove to realize the movably connection with each shaft head of the cross shaft, and the shaft head of the cross shaft can rotate relative to the long groove, and can also slide relative to the long groove.

[0017] In this embodiment, the cross shaft 3 includes two cross-shaped shaft bodies that are not in the same plane. The shaft body is a hollow structure and is penetrated by a pin shaft 6. Both ends of the shaft body are provided with bearings mounted on the pin shaft. In order to facilitate the installation of the pin shaft, the two shaft bodies of the cross shaft are made into a structure with non-intersecting axes and offset by a certain distance.

[0018] In this embodiment, the pin shaft is provided with a head at one end and a retaining ring 7 at the other end. The retaining ring is fixed to the tail end of the pin shaft by a pin 8 that radially penetrates the retaining ring and the tail end of the pin shaft. The bearing at one end is limited by the head of the pin shaft, and the bearing at the other end is limited by the retaining ring. The cross shaft and the bearing are connected by the pin shaft, and the position of the pin shaft is also fixed by the retaining ring and the pin, so as to realize the torque transmission function of the universal joint.

[0019] In this embodiment, a circle of limiting grooves 9 are provided inside the long groove 4, and a circle of raised parts 10 cooperating with the limiting grooves are provided on the outer periphery of the bearing. The bearing is embedded in the long groove through the cooperation of the raised parts and the limiting grooves, so as to prevent the bearing from falling out of the long groove and ensure stable operation.

[0020] In this embodiment, a circle of lubricating oil passage 11 is also provided in the middle of the limiting groove. The lubricating oil passage is opened in the limiting groove and lubricating oil is injected so that the bearing can slide freely in the long groove.

[0021] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0022] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0023] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0024] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0025] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A telescopic cross universal joint, comprising a first yoke, a second yoke and a cross shaft, characterized in that: The first yoke and the second yoke are connected via a cross shaft, and a slidable connection is adopted between the cross shaft and the first yoke and the second yoke so that the overall length of the cross universal joint can be extended or retracted.

2. The telescopic cross universal joint according to claim 1, characterized in that: Long grooves are provided on both sides of the first yoke and the second yoke, and each shaft head of the cross shaft is movably connected to the corresponding long groove through a bearing.

3. The telescopic cross universal joint according to claim 2, characterized in that: The cross shaft comprises two cross-intersecting shaft bodies which are not in the same plane. The shaft body is a hollow structure and is penetrated by a pin shaft. Both ends of the shaft body are provided with bearings which are sleeved on the pin shaft.

4. The telescopic cross universal joint according to claim 3, characterized in that: A head is provided at one end of the pin shaft and a retaining ring is provided at the other end. The retaining ring is fixed to the tail end of the pin shaft by a pin which penetrates the retaining ring and the tail end of the pin shaft in a radial direction.

5. The telescopic cross universal joint according to claim 2, characterized in that: A circle of limiting grooves is arranged inside the long groove, and a circle of raised parts cooperating with the limiting grooves is arranged on the outer periphery of the bearing; a circle of lubricating oil channels is also arranged in the middle of the limiting grooves.

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