阅读说明：本技术 用于降低万向节应力集中的十字轴总成 (Cross shaft assembly for reducing stress concentration of universal joint ) 是由 冯泉夫 高天安 王凯 程敏 于 2020-04-16 设计创作，主要内容包括：本发明涉及一种用于降低万向节应力集中的十字轴总成,所属万向节技术领域,包括十字轴,十字轴上设有与十字轴相密封式活动嵌套的轴套,轴套与十字轴间设有若干滚针,轴套口部与十字轴间设有防尘罩,防尘罩与滚针间设有油封,油封与滚针间设有压缩弹垫,十字轴上端设有与滚针相油路连通的注油嘴。轴套包括轴套滚道,轴套滚道上设有与轴套滚道呈一体化内凹的轴套中间部微弧形槽,轴套中间部微弧形槽与压缩弹垫间设有轴套近根部微弧形槽。具有结构紧凑、运行稳定性好和使用周期长的特点。解决了应力集中的问题。避免出现压痕、烧结、疲劳剥落及滚针的断裂、缺损等失效的发生,提高了十字轴总成的使用寿命。(The invention relates to a universal joint assembly for reducing stress concentration of a universal joint, which belongs to the technical field of universal joints and comprises a universal joint, wherein a shaft sleeve which is movably nested with the universal joint in a sealing manner is arranged on the universal joint, a plurality of roller pins are arranged between the shaft sleeve and the universal joint, a dust cover is arranged between the opening part of the shaft sleeve and the universal joint, an oil seal is arranged between the dust cover and the roller pins, a compression spring cushion is arranged between the oil seal and the roller pins, and an oil filling nozzle communicated with an oil path of the roller pins is arranged at the upper end. The shaft sleeve comprises a shaft sleeve raceway, a shaft sleeve middle part micro-arc groove which is integrated with the shaft sleeve raceway and is concave inwards is arranged on the shaft sleeve raceway, and a shaft sleeve near root part micro-arc groove is arranged between the shaft sleeve middle part micro-arc groove and the compression elastic cushion. The device has the characteristics of compact structure, good operation stability and long service cycle. The problem of stress concentration is solved. The occurrence of failures such as indentation, sintering, fatigue spalling, breakage, defect and the like of the roller pin is avoided, and the service life of the cross shaft assembly is prolonged.)

1. A cross assembly for reducing stress concentration in a universal joint, comprising: the universal joint comprises a cross shaft (2), wherein a shaft sleeve (3) which is movably nested with the cross shaft (2) in a sealing manner is arranged on the cross shaft (2), a plurality of roller pins (4) are arranged between the shaft sleeve (3) and the cross shaft (2), a dust cover (6) is arranged between the opening part of the shaft sleeve (3) and the cross shaft (2), an oil seal (1) is arranged between the dust cover (6) and the roller pins (4), and a compression spring cushion (7) is arranged between the oil seal (1) and the roller pins (4); the shaft sleeve (3) comprises a shaft sleeve roller path (12), the shaft sleeve roller path (12) is provided with a shaft sleeve middle part micro-arc groove (13) which is integrally concave with the shaft sleeve roller path (12), and a shaft sleeve near root micro-arc groove (14) which is integrally concave with the shaft sleeve roller path (12) is arranged between the shaft sleeve middle part micro-arc groove (13) and the compression elastic pad (7).

2. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 1, wherein: the universal joint pin (2) comprises a universal joint pin body (15), an oil injection nozzle (8) communicated with a needle roller (4) phase oil way is arranged at the upper end of the universal joint pin body (15), four universal joint pin journals (16) which are of an integrated structure with the universal joint pin body (15) are arranged on the universal joint pin body (15), blank bosses (17) which are integrated with the universal joint pin body (15) are arranged on two end faces of the universal joint pin body (15), oil ducts (19) which are communicated with each other and are communicated with the needle roller (4) are arranged on the universal joint pin journals (16), and an oil injection hole (18) which is communicated with the oil ducts (19) and is in threaded sealing sleeve connection with the oil injection nozzle (8) is arranged on one end face of the universal joint pin body (15).

3. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 2, wherein: the universal joint pin shaft neck (16) is provided with a shaft neck middle part micro-arc groove (10) which is symmetrically distributed with a shaft sleeve middle part micro-arc groove (13), and a shaft neck near root micro-arc groove (9) which is symmetrically distributed with a shaft sleeve near root micro-arc groove (14) is arranged between the shaft neck middle part micro-arc groove (10) and the oil seal (1).

4. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 3, wherein: and the two ends of the micro-arc groove (10) in the middle part of the shaft neck are provided with shaft neck circumferential end faces (11).

5. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 4, wherein: the circumferential end surface (11) of the shaft neck and the shaft sleeve roller path (12) are both in arc-shaped structures, and the arc-shaped structures are symmetrically distributed along the central line of the micro-arc groove in the middle part.

6. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 5, wherein: an oil plug (20) which is inserted and sleeved with the cross shaft journal (16) is arranged in the end face of the cross shaft journal (16).

7. The cross-shaft assembly for reducing stress concentration of a universal joint according to claim 3 or 5, wherein: the end face of the cross shaft journal (16) is provided with a plurality of right-handed oil guide grooves (21) which are distributed in an equidistant annular manner.

8. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 7, wherein: a nylon gasket (5) nested with the shaft sleeve (3) is arranged between the cross shaft journal (16) and the shaft sleeve (3).

9. The cross-shaft assembly for reducing stress concentrations in a universal joint of claim 8, wherein: nylon gasket (5) including nylon gasket body (22), nylon gasket body (22) in be equipped with oilhole (24), nylon gasket body (22) terminal surface on be equipped with a plurality of and dextrorotation lead the levogyration of laminating mutually oil groove (21) and lead oil groove (23).

Technical Field

The invention relates to the technical field of universal joints, in particular to a universal joint assembly for reducing stress concentration of a universal joint.

Background

The cross shaft is a joint component of a universal transmission device in an automobile driving system, has the function of realizing variable-angle power transmission and is used for changing the position of a transmission axis direction. The existing cross shaft is composed of a central body and shaft necks uniformly distributed along the periphery of the central body in the radial direction, and a bearing is installed on the shaft necks to form a cross shaft assembly. The universal joint pin shaft neck in the common universal joint pin assembly is cylindrical, a cylindrical bus is a straight line, a line tangent to a roller pin cylindrical surface of a shaft sleeve raceway is also a straight line, failure modes such as indentation, sintering, fatigue peeling, roller pin fracture and the like frequently occur in the universal joint pin assembly in the using process, and the main reason of causing the failure modes is that the local contact stress borne is too concentrated in the working process.

Along with the service life, aged and useless waste oil can't discharge and new grease will regularly fill, can bring great pressure for the assembly inside like this in the later stage, and oil seal on the bearing probably is backed up by inside great pressure and is caused inefficacy, and the filling of later stage grease also can be more and more difficult.

Disclosure of Invention

The invention mainly solves the defects of stress concentration, poor operation stability and short service life in the prior art, and provides the universal joint cross shaft assembly for reducing the stress concentration of the universal joint, which has the characteristics of compact structure, good operation stability and long service life. The problem of stress concentration is solved. The occurrence of failures such as indentation, sintering, fatigue spalling, breakage, defect and the like of the roller pin is avoided, and the service life of the cross shaft assembly is prolonged.

The technical problem of the invention is mainly solved by the following technical scheme:

a universal joint cross shaft assembly for reducing stress concentration of a universal joint comprises a cross shaft, wherein a shaft sleeve which is movably nested with the cross shaft in a sealing mode is arranged on the cross shaft, a plurality of roller pins are arranged between the shaft sleeve and the cross shaft, a dust cover is arranged between the opening portion of the shaft sleeve and the cross shaft, an oil seal is arranged between the dust cover and the roller pins, and a compression spring cushion is arranged between the oil seal and the roller pins. The shaft sleeve comprises a shaft sleeve raceway, the shaft sleeve raceway is provided with a shaft sleeve middle part micro-arc groove which is integrally concave with the shaft sleeve raceway, and a shaft sleeve near root micro-arc groove which is integrally concave with the shaft sleeve raceway is arranged between the shaft sleeve middle part micro-arc groove and the compression elastic cushion.

The compression elastic cushion can timely enable the roller pin to return to the original position through the elasticity of the compression elastic cushion when the roller pin moves, accelerated abrasion of the shaft neck and an arc-shaped structure which is symmetrical to the shaft sleeve along the longitudinal central line of the roller pin due to uneven stress is avoided, and the abrasion speed is also slowed down through the linear contact of the compression elastic cushion, the oil seal and the roller pin.

Preferably, the cross axle comprises a cross axle body, the upper end of the cross axle body is provided with an oil injection nozzle communicated with the roller pin oil path, the cross axle body is provided with four cross axle journals which are integrated with the cross axle body, two end faces of the cross axle body are respectively provided with a blank boss integrated with the cross axle body, the cross axle journals are respectively provided with an oil duct communicated with each other and communicated with the roller pin, and one end face of the cross axle body is provided with an oil injection hole communicated with the oil duct and in threaded sealing sleeve connection with the oil injection nozzle.

Preferably, the shaft neck of the universal joint pin is provided with a shaft neck middle part micro-arc groove which is symmetrically distributed with the shaft sleeve middle part micro-arc groove, and a shaft neck near root part micro-arc groove which is symmetrically distributed with the shaft sleeve near root part micro-arc groove is arranged between the shaft neck middle part micro-arc groove and the oil seal.

Preferably, the two ends of the micro-arc groove in the middle part of the shaft neck are provided with shaft neck circumferential end faces.

Preferably, the circumferential end face of the shaft neck and the shaft sleeve roller path are both in arc-shaped structures, and the arc-shaped structures are symmetrically distributed along the central line of the micro-arc groove in the middle part.

Preferably, an oil seal plug which is in inserted and sleeved with the cross shaft journal is arranged in the end face of the cross shaft journal.

Preferably, the end face of the shaft neck of the cross shaft is provided with a plurality of right-handed oil guide grooves which are distributed annularly at equal intervals.

Preferably, a nylon gasket nested with the shaft sleeve is arranged between the cross shaft journal and the shaft sleeve.

Preferably, the nylon gasket include the nylon gasket body, this internal oilhole that is equipped with of nylon gasket, the nylon gasket body terminal surface on be equipped with a plurality of with the dextrorotation lead the levogyration of oil groove phase laminating and lead the oil groove.

The invention can achieve the following effects:

compared with the prior art, the cross shaft assembly for reducing the stress concentration of the universal joint has the characteristics of compact structure, good operation stability and long service cycle. The problem of stress concentration is solved. The occurrence of failures such as indentation, sintering, fatigue spalling, breakage, defect and the like of the roller pin is avoided, and the service life of the cross shaft assembly is prolonged.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a sectional view showing an assembly structure of a cross and a sleeve in the present invention.

FIG. 3 is a schematic view of the construction of a cross in the present invention.

FIG. 4 is a cross-sectional view of the construction of the cross of the present invention.

FIG. 5 is a schematic end view of a cross-pin shaft of the present invention.

Fig. 6 is a schematic structural view of the bushing of the present invention.

Fig. 7 is a schematic structural view of a nylon gasket in the present invention.

In the figure: the oil seal comprises an oil seal 1, a cross shaft 2, a shaft sleeve 3, a roller pin 4, a nylon gasket 5, a dust cover 6, a compression elastic cushion 7, an oil filling nozzle 8, a micro-arc groove 9 near the root of a shaft neck, a micro-arc groove 10 in the middle of the shaft neck, a circumferential end face 11 of the shaft neck, a shaft sleeve raceway 12, a micro-arc groove 13 in the middle of the shaft sleeve, a micro-arc groove 14 near the root of the shaft sleeve, a cross shaft body 15, a cross shaft neck 16, a blank boss 17, an oil filling hole 18, an oil passage 19, an oil seal plug 20, a right-handed oil guiding groove.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.