CN218718292U - Spline structure and spline assembly - Google Patents

Abstract

The utility model discloses a spline structure and a spline assembly, wherein the spline structure comprises a nut, a circulator and a rolling body; the circulator comprises a retainer, an end cover and a lubricating block which are arranged in a split mode, the retainer penetrates through the nut, the end covers are arranged at two ends of the retainer, and the lubricating block is arranged between the retainer and the nut so that the nut, the retainer, the end cover and the lubricating block enclose to form a circulating raceway; the retainer is provided with a first penetrating channel communicated with the circulating raceway, and the end cover is provided with a second penetrating channel communicated with the first penetrating channel; the rolling body is rollably provided in the circulating raceway, and the rolling body is provided in plurality, and the plurality of rolling bodies are arranged in order along the extending direction of the circulating raceway to form an endless chain. The utility model discloses technical scheme can promote the anti deformability of circulator to extension spline structure's life.

Description

Spline structure and spline assembly

Technical Field

The utility model relates to a mechanical transmission technical field, in particular to spline structure and spline assembly.

Background

Along with the continuous improvement of electrification and automation degree in the industrial production process, more and more transmission devices and mechanisms are converted into electric drive from traditional hydraulic drive, pneumatic drive and the like, and a spline structure is used as an important ring in the transmission devices and the mechanisms and plays a role in guiding a linear bearing and driving an output shaft to rotate. Compared with the traditional transmission mode, the spline structure has the advantages of high transmission efficiency, low response delay, high precision, low pollution and the like.

In the prior art, the spline structure includes a nut, a circulator and rolling elements, the circulator is disposed inside the nut, a circulating raceway for the rolling elements to roll is provided in the circulator, and a plurality of rolling elements in the circulating raceway can form a circulating chain. In the moving process of the spline shaft, the circulating chain rolls along the circulating raceway, the two ends of the circulator bear frequent impact when the circulating chain is reversed, so that the two ends of the circulator are easy to deform, and meanwhile, due to the poor self-lubricating capacity of the circulator, the circulator is heated and deformed by the rolling bodies under high-frequency impact, so that the circulating chain is clamped, and the service life of the spline structure is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective provides a spline structure and spline subassembly aims at promoting the anti deformability of circulator to extension spline structure's life.

In order to achieve the above object, the present invention provides a spline structure, including:

a nut;

the circulator comprises a retainer, an end cover and a lubricating block which are arranged in a split mode, the retainer penetrates through the nut, the end cover is arranged at each of two ends of the retainer, and the lubricating block is arranged between the retainer and the nut so that the nut, the retainer, the end cover and the lubricating block enclose to form a circulating raceway; the retainer is provided with a first penetrating channel communicated with the circulating raceway, and the end cover is provided with a second penetrating channel communicated with the first penetrating channel;

the rolling bodies are arranged in the circulating roller path in a rolling mode, the rolling bodies are multiple, and the multiple rolling bodies are sequentially arranged along the extending direction of the circulating roller path to form a circulating chain.

In an embodiment of the present invention, a first rolling path is enclosed between the retainer and the nut, and the first rolling path is communicated with the first through passage; a second roller path is formed between the lubricating block and the nut in an enclosing manner; a reversing roller path is formed between the retainer and each end cover in an enclosing manner;

one end of the first raceway is communicated with one end of the second raceway through one reversing raceway, so that the first raceway, the second raceway and the two reversing raceways form the circulating raceway.

The utility model discloses an in the embodiment, first circular arc groove has been seted up to the inside wall of nut, the intercommunication groove has been seted up to the lateral wall of holder, the intercommunication groove run through to the inside wall of holder, with first passageway intercommunication of wearing to establish, first circular arc groove with the intercommunication groove constitutes first raceway.

The utility model discloses an in the embodiment, the intercommunication groove with one of them groove lateral wall that first circular arc groove is adjacent includes cambered surface section and plane segment, the cambered surface section with first circular arc groove meets, the plane segment connect in the cambered surface section is kept away from one side of first circular arc groove.

In an embodiment of the present invention, the included angle between the plane segment and the vertical plane is defined as α, and then the condition is satisfied: alpha is more than or equal to 45 degrees and less than or equal to 80 degrees.

The utility model discloses an in the embodiment, the second circular arc groove has still been seted up to the inside wall of nut, the third circular arc groove has been seted up to the lateral wall of lubricating block, the second circular arc groove with third circular arc groove constitutes the second raceway.

In an embodiment of the present invention, the lubricating block has a first limiting surface and a second limiting surface arranged at an included angle, the third arc groove is opened between the first limiting surface and the second limiting surface, the inner side wall of the nut has a first limiting wall and a second limiting wall arranged at an included angle, and the first limiting surface and the second limiting surface are abutted against the first limiting wall and the second limiting wall respectively;

and/or, the lubricating block still has the spacing face of third and the spacing face of fourth that is the contained angle setting, the holder has the spacing wall of third and the spacing wall of fourth that are the contained angle setting, the spacing face of third with the spacing face of fourth respectively with the spacing wall of third with the spacing wall of fourth butt.

In an embodiment of the present invention, two opposite mounting grooves are formed in the inner side wall of the nut, and the width between the bottoms of the mounting grooves is greater than the maximum width of the retainer.

In an embodiment of the present invention, the retainer is provided with two, two the retainer is along the circumferential interval of the nut is set up, and two the retainer encloses to close and forms the first passage, each the retainer with be equipped with two intervals between the nut and set up the lubricating block, so that the nut and one the retainer, two the end cover and one the lubricating block encloses to close and is formed with one the circulation raceway.

In an embodiment of the present invention, the outer sidewall of the retainer has a stiffener, and the stiffener abuts against the inner sidewall of the nut;

and/or one of the inner side wall of the end cover and the end part of the retainer is provided with a first positioning hole, the other one of the inner side wall of the end cover and the end part of the retainer is provided with a first positioning pin, and the first positioning pin is inserted into the first positioning hole;

and/or, the end cap is connected to the nut by a fastener;

and/or one of the retainer and the lubricating block is provided with a second positioning hole, and the other of the retainer and the lubricating block is provided with a second positioning pin which is inserted into the second positioning hole.

The utility model also provides a spline assembly, including the integral key shaft and as above spline structure, the integral key shaft is movably worn to locate the second wear to establish the passageway with the first passageway of wearing to establish, and with the contact of circulation chain.

The utility model provides a spline structure, through design holder, end cover and the lubricating block that the components of a whole that can function independently set up with the circulator. On one hand, the thickness of the end cover can be set to be large enough to increase the strength of the circulator, so that the anti-deformation capacity of the circulator is improved, and the end cover cannot be easily deformed when the circulating chain impacts the end cover in a reversing manner; on the other hand, through being provided with the lubricating block between retainer and nut, the in-process that the circulation chain rolled in the circulation raceway, the lubricating block will appear lubricating oil in order to lubricate the rolling body surface on the circulation chain, make the circulator have self-lubricating effect, can reduce the rolling element under the high frequency striking and the circulator between the friction, thereby improved because produce the friction between rolling element and the circulator and lead to the phenomenon that the circulator heated and warp, make the anti deformability of circulator promote equally, avoided the circulation chain to be blocked, thereby the life of spline structure has been prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a partial schematic structural view of an embodiment of a spline assembly according to the present invention;

fig. 2 is a cross-sectional view of an embodiment of the spline assembly of the present invention;

fig. 3 is a cross-sectional view of the spline structure of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3;

fig. 5 is a schematic structural diagram of a retainer according to an embodiment of the spline structure of the present invention;

fig. 6 is a cross-sectional view of a retainer according to an embodiment of the spline structure of the present invention;

fig. 7 is a schematic structural diagram of an end cap according to an embodiment of the spline structure of the present invention;

fig. 8 is a schematic structural view of a lubricating block in an embodiment of the spline structure of the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a spline structure 100 and spline subassembly 1000 aims at promoting circulator 20's anti deformability to extension spline structure 100's life.

The following description will be made of the specific structure of the spline structure 100 and the spline assembly 1000 of the present invention:

referring to fig. 1 to 3 in combination, in an embodiment of the spline structure 100 of the present invention, the spline structure 100 includes a nut 10, a circulator 20, and a rolling element 31; the circulator 20 comprises a retainer 21, an end cover 22 and a lubricating block 23 which are arranged in a split manner, the retainer 21 penetrates through the nut 10, the end covers 22 are arranged at two ends of the retainer 21, and the lubricating block 23 is arranged between the retainer 21 and the nut 10, so that the nut 10, the retainer 21, the end cover 22 and the lubricating block 23 are enclosed to form a circulating raceway 2a; the retainer 21 is provided with a first through passage 211 communicated with the circulating raceway 2a, and the end cover 22 is provided with a second through passage 221 communicated with the first through passage 211; the rolling bodies are rollably provided in the circulating raceway 2a, the rolling body 31 is provided in plural, and the plural rolling bodies 31 are arranged in order in the extending direction of the circulating raceway 2a to form the circulating chain 30.

It can be understood that the present invention provides the spline structure 100, by designing the circulator 20 as the holder 21, the end cap 22 and the lubricating block 23 which are separately arranged. On one hand, the thickness of the end cover 22 can be set to be large enough to increase the strength of the circulator 20, so that the deformation resistance of the circulator 20 is improved, and the end cover 22 cannot be easily deformed when the circulating chain 30 reversely impacts the end cover 22; on the other hand, by arranging the lubricating block 23 between the retainer 21 and the nut 10, in the process that the circulating chain 30 rolls in the circulating raceway 2a, the lubricating block 23 will separate out lubricating oil to lubricate the surface of the rolling body 31 on the circulating chain 30, so that the circulator 20 has a self-lubricating effect, the friction between the rolling body 31 and the circulator 20 under high-frequency impact can be reduced, the phenomenon of heating deformation of the circulator 20 due to the friction between the rolling body 31 and the circulator 20 is improved, the deformation resistance of the circulator 20 is also improved, the circulating chain 30 is prevented from being clamped, and the service life of the spline structure 100 is prolonged.

In one embodiment, the lubricating block 23 may be a high oil-containing polymer with an oil content of 60% to 90%, the lubricating block 23 is impregnated with a large amount of lubricating oil, the rolling elements 31 can be lubricated by the lubricating block 23 when the rolling elements 31 contact the lubricating oil, and the excess lubricating oil is absorbed and stored again by the lubricating block 23 after the rolling elements 31 roll through the lubricating block 23.

Illustratively, the rolling elements 31 may include, but are not limited to, balls.

In the assembling process of the spline structure 100 provided by the embodiment of the application, firstly, the lubricating block 23 is fixedly installed on the outer side of the retainer 21, then, one end cover 22 is fixedly installed at one end part of the retainer 21, then, the nut 10 is sleeved on the retainer 21 from one end of the retainer 21 where the end cover 22 is not installed, then, the end cover 22 and the nut 10 are fixed by using the fastening piece, then, one end of the retainer 21 where the end cover 22 is not installed faces upwards, the rolling body 31 is installed in the circulating raceway 2a, after the rolling body 31 is filled, the other end cover 22 is fixedly installed at the other end of the retainer 21, and the end cover 22 and the nut 10 are fixed by using the fastening piece.

Further, referring to fig. 2 in combination, in an embodiment, a first rolling path 2a1 is formed between the retainer 21 and the nut 10, and the first rolling path 2a1 is communicated with the first through passage 211; a second roller path 2a2 is formed between the lubricating block 23 and the nut 10 in an enclosing manner; a reversing roller path 2a3 is formed between the retainer 21 and each end cover 22; one end of the first raceway 2a1 is communicated with one end of the second raceway 2a2 through a diverting raceway 2a3, so that the first raceway 2a1, the second raceway 2a2 and the diverting raceways 2a3 constitute a circulating raceway 2a.

With the arrangement, after the assembly is completed, the first rolling path 2a1 is enclosed between the retainer 21 and the nut 10, the second rolling path 2a2 is enclosed between the lubricating block 23 and the nut 10, and the reversing rolling path 2a3 is enclosed between the retainer 21 and each end cover 22, so that the first rolling path 2a1, the second rolling path 2a2 and the two reversing rolling paths 2a3 can form the circulating rolling path 2a for the circulating chain 30 to roll.

In the present embodiment, the first raceway 2a1 and the second raceway 2a2 are each provided extending in the axial direction of the nut 10.

Of course, in other embodiments, it is possible to have the first raceway 2a1 directly on the cage 21, the second raceway 2a2 on the stick 23, and the reversing raceway 2a3 on the end cap 22.

Further, referring to fig. 3 to 6, in an embodiment, the inner side wall of the nut 10 is opened with a first arc groove 2a11, the outer side wall of the holder 21 is opened with a communication groove 2a12, the communication groove 2a12 penetrates through the inner side wall of the holder 21 to communicate with the first through passage 211, and the first arc groove 2a11 and the communication groove 2a12 form a first rolling path 2a1.

In this arrangement, after the retainer 21 is inserted into the nut 10 during the assembly process, the first arc groove 2a11 of the nut 10 and the communicating groove 2a12 of the retainer 21 form the first raceway 2a1, which not only facilitates the mounting and dismounting of the rolling elements 31, but also prevents the rolling elements 31 from being difficult to dismount after being caught on the first raceway 2a1.

Further, referring to fig. 4 and fig. 6 in combination, in an embodiment, one of the groove side walls of the communication groove 2a12 adjacent to the first circular-arc groove 2a11 includes a curved surface section 2a121 and a flat surface section 2a122, the curved surface section 2a121 is connected to the first circular-arc groove 2a11, and the flat surface section 2a122 is connected to a side of the curved surface section 2a121 away from the first circular-arc groove 2a 11.

By the arrangement, the rolling bodies 31 on the circulating chain 30 can be supported by the arc-shaped sections 2a121 and the plane sections 2a122, so that the contact area between the rolling bodies 31 and the circulating raceway 2a is increased, and the rigidity and reliability of the retainer 21 for the rolling bodies 31 are improved, meanwhile, compared with a mode that the rolling bodies 31 are fixed by directly adopting the arc-shaped sections 2a121, the plane sections 2a122 are transited in the arc-shaped sections 2a121, so that the contact positions of the rolling bodies 31 and the retainer 21 are more inward, the effective contact thickness of the retainer 21 is larger, the rigidity of the retainer 21 is stronger, and the deformation resistance of the retainer 21 can be effectively improved.

Further, referring to fig. 6 in combination, in an embodiment, an included angle between the plane segment 2a122 and the vertical plane is defined as α, then the condition is satisfied: alpha is more than or equal to 45 degrees and less than or equal to 80 degrees.

When the included angle between the plane section 2a122 and the vertical plane is too small, the opening S of the retainer 21 communicating with the first through passage 211 is caused to be large, and the rolling body 31 is caused to fall from the opening S; when the included angle between the plane section 2a122 and the vertical surface is too large, the opening S of the retainer 21 communicating with the first through passage 211 is caused to be small, so that the rolling element 31 is caused to be stuck in the retainer 21; therefore, by controlling the angle between the plane section 2a122 and the vertical plane to be 45 ° to 80 °, the above problem can be effectively improved.

It should be noted that, when the spline structure 100 is placed horizontally, a surface that passes through the center of the nut 10, is extended along the length direction of the nut 10, and is disposed perpendicular to the horizontal direction is defined as a vertical surface.

Further, referring to fig. 3 and 8, in an embodiment, the inner side wall of the nut 10 is further formed with a second arc groove 2a21, the outer side wall of the lubricating block 23 is formed with a third arc groove 2a22, and the second arc groove 2a21 and the third arc groove 2a22 form a second rolling path 2a2.

With this arrangement, after the assembly is completed, the second arc groove 2a21 of the nut 10 and the third arc groove 2a22 of the lubricating block 23 form the second rolling path 2a2, which not only facilitates the installation and removal of the rolling elements 31, but also prevents the rolling elements 31 from being difficult to remove after being stuck in the second rolling path 2a2.

Further, in order to improve the installation stability between the lubricating block 23 and the nut 10, referring to fig. 3 and fig. 8, in an embodiment, the lubricating block 23 has a first limiting surface 231 and a second limiting surface 232 disposed at an included angle, the third arc groove 2a22 is opened between the first limiting surface 231 and the second limiting surface 232, the inner side wall of the nut 10 has a first limiting wall 11 and a second limiting wall 12 disposed at an included angle, and the first limiting surface 231 and the second limiting surface 232 are abutted to the first limiting wall 11 and the second limiting wall 12, respectively.

So set up, after the equipment is accomplished, spacing face 231 of first spacing face 231 and second on the lubricating block 23 will with the spacing wall 12 of first spacing wall 11 and second on the nut 10 inside wall butt each other, because spacing face 231 of first spacing face and second 232 are the contained angle setting, and spacing wall 12 of first spacing wall 11 and second is the contained angle setting, alright under the cooperation of spacing face 231 and first spacing wall 11, and under the cooperation of spacing face 232 of second and second 12, carry on spacingly to lubricating block 23 in a plurality of directions, alright prevent to take place relative slip and rotation between lubricating block 23 and the nut 10, with the installation stability between promotion lubricating block 23 and the nut 10.

Further, in order to improve the installation stability between the lubricating block 23 and the holder 21, referring to fig. 3 and 8 in combination, in an embodiment, the lubricating block 23 further has a third limiting surface 233 and a fourth limiting surface 234 disposed at an included angle, the holder 21 has a third limiting wall 215 and a fourth limiting wall 216 disposed at an included angle, and the third limiting surface 233 and the fourth limiting surface 234 abut against the third limiting wall 215 and the fourth limiting wall 216, respectively.

So set up, after the equipment is accomplished, third spacing face 233 and fourth spacing face 234 on the lubricating block 23 will with the spacing wall 215 of third on the holder 21 and the spacing wall 216 of fourth butt each other, because third spacing face 233 is the contained angle setting with fourth spacing face 234, and third spacing wall 215 is the contained angle setting with fourth spacing wall 216, alright under the cooperation of third spacing face 233 with third spacing wall 215, and under the cooperation of fourth spacing face 234 with fourth spacing wall 216, spacing lubricating block 23 in a plurality of directions, alright prevent relative slip and rotation from taking place between lubricating block 23 and the holder 21, with the installation stability between promotion lubricating block 23 and the holder 21.

Further, referring to fig. 5 to 7, in an embodiment, the inner side wall of the end cap 22 is provided with a connecting groove 2a31, both ends of the holding frame 21 are provided with a first connecting hole 2a32, a second connecting hole 2a33 and a guiding groove 2a34, the guiding groove 2a34 is communicated with the connecting groove 2a31, one end of the first rolling path 2a1 is communicated with a guiding groove 2a34 through a first connecting hole 2a32, and one end of the second rolling path 2a2 is communicated with a guiding groove 2a34 through a second connecting hole 2a33, so that each connecting groove 2a31, a first connecting hole 2a32, a second connecting hole 2a33 and a guiding groove 2a34 form a reversing rolling path 2a3.

With this arrangement, after the assembly is completed, a connecting groove 2a31 of the end cap 22, a first communicating hole 2a32, a second communicating hole 2a33 and a guide groove 2a34 of the retainer 21 form a reversing raceway 2a3, which is designed to facilitate the installation and removal of the rolling elements 31 and prevent the problem that the rolling elements 31 are difficult to remove when stuck in the reversing raceway 2a3.

Further, referring to fig. 7, in an embodiment, the inner side wall of the end cover 22 is further provided with a groove 222, the connecting groove 2a31 is opened at the bottom of the groove 222, and the end of the holder 21 is inserted into the groove 222.

With this arrangement, during assembly, the end cap 22 can be pre-fixed on the retainer 21 by inserting the end of the retainer 21 into the groove 222 of the end cap 22, and then the retainer 21 can be clamped and fixed in the nut 10 by locking the end cap 22 on the nut 10 with the fastening member.

Further, referring to fig. 3, in an embodiment, the inner side wall of the nut 10 is provided with two opposite mounting grooves 13, and a width between groove bottoms of the two mounting grooves 13 is greater than a maximum width of the retainer 21. With this arrangement, when assembling, the retainer 21 can be inserted into the entire nut 10 smoothly through the large space between the two mounting grooves 13, and then the retainer 21 is mounted upward or downward to a position abutting against the nut 10, thereby facilitating the assembly of the retainer 21.

Further, referring to fig. 3 in combination, in an embodiment, two retainers 21 are provided at intervals along the circumference of the nut 10, the two retainers 21 surround to form a first through channel 211, and two lubricating blocks 23 are provided at intervals between each retainer 21 and the nut 10, so that the nut 10, one retainer 21, the two end caps 22 and one lubricating block 23 surround to form a circulating raceway 2a.

By arranging the two retainers 21 and the two lubricating blocks 23 between each retainer 21 and the nut 10, that is, by arranging the four lubricating blocks 23 in total, the nut 10, the two retainers 21, the two end caps 22 and the four lubricating blocks 23 can be enclosed to form four circulating raceways 2a arranged at intervals, so that one circulating chain 30 is arranged in each circulating raceway 2a, and the spline shaft 200 can move more smoothly under the action of the four circulating chains 30.

Further, referring to fig. 3, in an embodiment, the outer side wall of the retainer 21 has a rib 212, and the rib 212 abuts against the inner side wall of the nut 10, and since the retainer 21 is deformed by a force during the circulation of the whole circulation chain 30, the strength of the retainer 212 can be improved by providing the rib 212 on the outer side wall of the retainer 21, so as to improve the circulation stability and the service life of the whole circulation chain 30, and meanwhile, the retainer 21 can be positioned on the nut 10 by the rib 212, so as to perform the function of auxiliary positioning.

Further, referring to fig. 5 and 7 in combination, in an embodiment, one of the inner side wall of the end cover 22 and the end portion of the holder 21 has a first positioning hole 223, and the other has a first positioning pin 213, and the first positioning pin 213 is inserted into the first positioning hole 223; with such an arrangement, in the assembling process, the end cap 22 can be positioned on the holder 21 by the cooperation of the first positioning pin 213 and the first positioning hole 223, so as to perform the positioning assisting function.

Further, referring to fig. 7 in combination, in one embodiment, end cap 22 is attached to nut 10 by a fastener; so configured, the strength of the connection between the end cap 22 and the nut 10 is ensured by locking the end cap 22 to the nut 10 using fasteners. In particular, the fastener may be a screw, a pin, or the like connector.

Further, referring to fig. 5, 6 and 8 in combination, in one embodiment, one of the retainer 21 and the stick 23 has a second positioning hole 235, and the other has a second positioning pin 214, and the second positioning pin 214 is inserted into the second positioning hole 235; with such an arrangement, in the assembling process, the lubricating block 23 can be positioned on the retainer 21 by the cooperation of the second positioning pin 214 and the second positioning hole 235, so as to perform the function of auxiliary positioning.

With reference to fig. 1 and fig. 2, the present invention further provides a spline assembly 1000, which includes a spline shaft 200 and the spline structure 100 as described above, wherein the specific structure of the spline structure 100 refers to the above embodiments, and the spline assembly 1000 adopts all technical solutions of all the above embodiments, so that all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein. The spline shaft movably penetrates through the second penetrating channel and the first penetrating channel and is in contact with the circulating chain.

In addition, in order to ensure that the spline shaft 200 can smoothly move along the axial direction thereof during the moving process, a limiting groove may be formed in the peripheral wall of the spline shaft 200, the limiting groove is communicated with the circulating raceway 2a, and during the rolling process of the circulating chain 30, half (more than half or less than half) of the rolling body 31 will extend into the limiting groove, so as to ensure that the spline shaft 200 smoothly moves along the axial direction thereof under the cooperation of the rolling body 31 and the limiting groove.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (11)

1. A spline structure, comprising:

a nut;

the circulator comprises a retainer, an end cover and a lubricating block which are arranged in a split mode, the retainer penetrates through the nut, the end cover is arranged at each of two ends of the retainer, and the lubricating block is arranged between the retainer and the nut so that the nut, the retainer, the end cover and the lubricating block enclose to form a circulating raceway; the retainer is provided with a first penetrating channel communicated with the circulating raceway, and the end cover is provided with a second penetrating channel communicated with the first penetrating channel;

the rolling bodies are arranged in the circulating roller path in a rolling mode, the rolling bodies are multiple, and the multiple rolling bodies are sequentially arranged along the extending direction of the circulating roller path to form a circulating chain.

2. The spline structure of claim 1, wherein a first raceway is defined between the cage and the nut, and the first raceway is communicated with the first through passage; a second raceway is formed by enclosing the lubricating block and the nut; a reversing roller path is formed between the retainer and each end cover in an enclosing manner;

one end of the first raceway is communicated with one end of the second raceway through one reversing raceway, so that the first raceway, the second raceway and the two reversing raceways form the circulating raceway.

3. The spline structure of claim 2, wherein the inner side wall of the nut is provided with a first arc groove, the outer side wall of the retainer is provided with a communication groove, the communication groove penetrates through the inner side wall of the retainer to communicate with the first through passage, and the first arc groove and the communication groove form the first raceway.

4. The spline structure of claim 3, wherein one of the groove side walls of the communication groove adjacent to the first arc groove comprises an arc surface section and a planar section, the arc surface section is connected with the first arc groove, and the planar section is connected to a side of the arc surface section away from the first arc groove.

5. The spline structure of claim 4, wherein an angle α between the planar segment and the vertical plane is defined, the condition: alpha is more than or equal to 45 degrees and less than or equal to 80 degrees.

6. The spline structure of claim 2, wherein the inner side wall of the nut is further provided with a second arc groove, the outer side wall of the lubricating block is provided with a third arc groove, and the second arc groove and the third arc groove form the second raceway.

7. The spline structure of claim 6, wherein the lubrication block has a first limit surface and a second limit surface arranged at an included angle, the third arc groove is opened between the first limit surface and the second limit surface, the inner side wall of the nut has a first limit wall and a second limit wall arranged at an included angle, and the first limit surface and the second limit surface are abutted with the first limit wall and the second limit wall respectively;

and/or, the lubricating block still has the spacing face of third and the spacing face of fourth that is the contained angle setting, the holder has the spacing wall of third and the spacing wall of fourth that are the contained angle setting, the spacing face of third with the spacing face of fourth respectively with the spacing wall of third with the spacing wall of fourth butt.

8. The spline structure of any one of claims 1 to 7, wherein the nut has two opposite mounting grooves defined in an inner side wall thereof, and a width between groove bottoms of the two mounting grooves is greater than a maximum width of the retainer.

9. The spline structure according to any one of claims 1 to 7, wherein there are two of the retainers, two of the retainers are arranged at intervals along a circumferential direction of the nut, and the two retainers surround to form the first through passage, and two of the lubricating blocks are arranged at intervals between each of the retainers and the nut, so that the nut and one of the retainers, two of the end caps and one of the lubricating blocks surround to form one of the circulating raceways.

10. The spline structure according to any one of claims 1 to 7, wherein an outer side wall of the cage has a rib abutting against an inner side wall of the nut;

and/or one of the inner side wall of the end cover and the end part of the retainer is provided with a first positioning hole, the other one of the inner side wall of the end cover and the end part of the retainer is provided with a first positioning pin, and the first positioning pin is inserted into the first positioning hole;

and/or, the end cap is connected to the nut by a fastener;

and/or one of the retainer and the lubricating block is provided with a second positioning hole, and the other of the retainer and the lubricating block is provided with a second positioning pin which is inserted into the second positioning hole.

11. A spline assembly characterized by comprising a spline shaft and a spline structure according to any one of claims 1 to 10, the spline shaft being movably disposed through the second through passage and the first through passage and being in contact with the endless chain.

Images