TWM583002U - Ball spline set with oil storage groove - Google Patents

Abstract

A ball spline group having an oil storage tank, comprising: a spline shaft, an outer cylinder, a two-end cap group and a plurality of balls, wherein the end cap groups are provided with at least one return channel, and the two return channels are The end of the end cap group is respectively a recessed at least one oil storage tank, wherein the oil storage tanks are for accommodating a lubricating oil, wherein the oil storage tanks are located at the end The end cap group faces a side surface of the outer cylinder, and the end cap groups each have at least one guiding groove, and the guiding grooves communicate with the oil storage slots and the first circulation holes and the second circulation holes One or a combination thereof is used to guide the lubricating oil to lubricate the ball set. Thereby, the ball set is lubricated by the lubricating oil placed in the oil reservoirs to reduce the friction of the ball set.

Description

Ball spline group with oil storage tank

This creation is related to a ball spline set, in particular to a ball spline set with an oil reservoir.

Pressing, the ball spline group is a linear guide device for linearly moving the outer cylinder on the spline shaft. Since the steel ball is rolled on the spline groove, it is suitable for a mechanism for linearly moving while transmitting torque.

According to the Chinese patent (CN 201884466 U), the patent document is a ball spline group and a spline shaft thereof, wherein the ball spline group comprises: a spline shaft, an outer cylinder, a ball cage, and a cyclic motion between the components Balls. Wherein, the ball retainer is disposed between the spline shaft and the outer cylinder to maintain the position of the ball before assembly or when the outer cylinder is separated from the spline shaft to avoid falling.

However, in the ball spline group, limited by the structural design of the ball and the ball retainer, the ball spline group is relatively easily damaged when subjected to a high radial load for a long time, thereby causing ball movement. When vibration occurs, especially when the ball is moving at a high speed, the probability of the ball falling off is increased, causing a risk to the user's operation. Among them, the frictional force exists on the contact surface regardless of the relative movement of the ball and the ball cage and the spline shaft. As is well known in general physical principles, friction is often the largest source of kinetic energy consumption, and in the process of converting kinetic energy into thermal energy, not only a large amount of energy is consumed, but also the hidden danger of overheating of equipment.

Therefore, after observing the above-mentioned defects, the creator of this case believed that the ball spline group needs to have a lubricating structure, and the creation of this creation.

The main purpose of the present invention is to provide a ball spline group having an oil reservoir, which lubricates the balls by lubricating oil contained in the oil storage tank to reduce the friction of the balls.

In order to achieve the above object, the present invention provides a ball spline group having an oil reservoir, comprising: a spline shaft on which at least one track groove is opened along the axial direction of the spline shaft; An outer cylinder slidably sleeved on the spline shaft, and at least one ball groove is formed on an inner side surface of the outer cylinder along an axial direction of the outer cylinder, and an outer side surface and an inner side surface of the outer cylinder At least one circulation passage is disposed along the axial direction of the outer cylinder, the ball groove corresponding to the track groove forms a ball passage; and the two end cover groups are sleeved on the spline shaft, and respectively Provided at the two ends of the outer tube, at least one return channel is disposed on one side of the end cover group facing the outer tube, and the two ends of the return channel are respectively a first circulation hole and a second circulation a first circulation hole connected to the ball passage, the second circulation holes are connected to the circulation passage, the return passage, the circulation passage and the ball passage together form a ball circulation passage; and at least one ball group, The ball group is composed of a plurality of balls, and the ball group Disposed in the ball circulation passage, and the set of balls moving in the ball circulation passage.

The oil storage tank is configured to receive at least one oil storage tank, wherein the oil storage tanks are located at a side of the end cover group facing the outer cylinder, and the oil storage tanks are recessed The end cap group is recessed with at least one guiding groove, and the guiding grooves communicate with the oil storage tank and one or a combination of the first circulation holes and the second circulation holes to guide the lubricating oil to lubricate the Ball set.

Preferably, the oil storage tanks are disposed between the first circulation holes and the second circulation holes, and the guide grooves communicate with the second circulation holes.

Preferably, the track groove is a groove recessed from a surface of the spline shaft toward a center point of the spline shaft, the track groove being communicated from one end of the spline shaft to the spline shaft One end.

Preferably, the ball groove is a groove recessed from an inner side surface of the outer tube toward an outer side surface of the outer tube, and the ball groove is communicated from one end of the outer tube to the other end of the outer tube.

Preferably, the outer cover is sleeved on the spline shaft, and the outer covers are respectively disposed on the other side of the side cover group facing one side of the outer cylinder, The outer tube, the end cap group and the outer cover are respectively provided with two perforations, and the perforations are for the two locking screws to penetrate, so that the outer tube, the end cap groups and the outer covers are tightly coupled.

Preferably, the number of the track grooves is four, and the track grooves are symmetrically disposed on the surface of the spline shaft.

Preferably, the number of the ball passages and the circulation passages is four, and the number of the return passages is eight, and the ball passages, the circulation passages, and the return passages jointly form four of the balls. Loop channel.

Preferably, the end caps are respectively composed of a first cover body and a second cover body, and the first cover bodies are respectively recessed with at least one recessed portion, and the second cover bodies are each at least A protrusion corresponding to the recess is protruded.

Preferably, the concave portions are a first curved groove, and the protruding portions each have a second curved groove, and the first curved grooves are combined with the second curved grooves. These return channels.

Preferably, one end of the outer cylinder has a flange portion protruding from the inner side surface of the outer cylinder toward the outer side surface of the outer cylinder.

The ball spline group provided with the oil storage tank provided by the present invention receives the lubricating oil through the oil storage tank, and guides the lubricating oil through the guide groove to moisturize the ball group. Thereby, the oil storage tank can directly supply the lubricating oil to the ball group to reduce the friction between the ball group and the spline shaft, which improves the service life of the ball spline group. In addition, the sump of the present invention is recessed on a side of the end cap group facing the outer cylinder, and the end cap group is tightly coupled with the outer cylinder, so that the water vapor and dust in the environment can be blocked to a certain extent. Foreign matter, so as to avoid mixing the lubricating oil with moisture, so that the lubricating oil is deteriorated and the lubricating effect is broken.

Please refer to FIG. 1 , which is a perspective view of a first embodiment of the present invention, and FIG. 2 and FIG. 5 are a perspective view of an exploded view and an end cap group of the first embodiment of the present invention. The present invention discloses a ball spline set 100 having an oil reservoir, which comprises a spline shaft 10 on which at least one track groove 11 is opened in the axial direction of the spline shaft 10. In the present embodiment, the track groove 11 is a groove recessed from the surface of the spline shaft 10 toward the center point of the spline shaft 10, and the track groove 11 is connected to the one end of the spline shaft 10 to the The other end of the spline shaft 10, the spline shaft 10 is provided with four track grooves 11 on the surface of the spline shaft 10. The number of the track grooves 11 is not limited thereto, and the application is required for the end view. . In other embodiments, the spline shaft 10 can have other numbers of the track slots 11. In terms of production, the spline shaft 10 can be simultaneously machined and polished by a grinding device, and four track grooves 11 can be completed in one operation.

An outer cylinder 20, which may also be referred to as a spline nut, is a tubular metal member that is open at both ends. The gap between the outer cylinder 20 and the spline shaft 10 may be from 0.05 mm to 1 mm, but the present invention is not limited thereto. The outer cylinder 20 is slidably sleeved on the spline shaft 10, and at least one ball groove 21 is opened along the axial direction of the outer cylinder 20 on the inner surface of the outer cylinder 20, and the outer surface and the inner side of the outer cylinder 20 At least one circulation passage 22 is bored between the surfaces along the axial direction of the outer cylinder 20. The ball groove 21 and the track groove 11 correspondingly form a ball passage 50. In the present embodiment, the ball groove 21 is a groove recessed from the inner surface of the outer tube 20 toward the outer surface of the outer tube 20, and the ball groove 21 is communicated from the one end of the outer tube 20 to the outer tube. At the other end of the 20, the outer cylinder 20 has four of the ball grooves 21 and four of the circulation passages 22, and the number of the ball passages 50 is the same as the number of the circulation passages 22. Specifically, one of the track grooves 11 and one of the ball grooves 21 form a ball passage 50, and one of the ball passages 50 must be used together with the circulation passage 22.

The end cap group 30 is sleeved on the spline shaft 10 and respectively disposed at two ends of the outer cylinder 20, and the end cap group 30 faces each side of the outer cylinder 20 At least one return passage 60 is disposed, and the two ends of the return passages 60 are respectively a first circulation hole 31 and a second circulation hole 32. The first circulation holes 31 are connected to the ball passage 50, and the second circulation The hole 32 is connected to the circulation passage 22, and the return passage 60, the circulation passage 22 and the ball passage 50 together form a ball circulation passage 70.

At least one ball set 40, the ball set 40 is composed of a plurality of balls 401, the ball set 40 is accommodated in the ball circulation passage 70, and the ball set 40 moves in the ball circulation passage 70.

The oil storage tanks 33 are disposed in the end cap group 30 for accommodating a lubricating oil 331. The oil storage tanks 33 are located in the end cap group. The first end cover group 30 is recessed with at least one guiding groove 34, and the guiding grooves 34 communicate with the oil storage grooves 33 and the first circulation holes 31 and the second One or a combination of the circulation holes 32 is used to guide the lubricating oil 331 to lubricate the ball set 40.

It should be further noted that, in this embodiment, the ball spline group 100 is not provided with a ball cage, but the ball channel 50 is directly formed by the track groove 11 and the ball groove 21, but this creation does not Limits, you can also set the ball cage.

Please refer to FIG. 2, which is an exploded view of the first embodiment of the creation. The ball spline group 100 further includes two outer covers 80. The outer covers 80 are sleeved on the spline shaft 10, and the outer covers 80 are respectively disposed on one side of the end cap group 30 facing the outer tube 20. The other side. In the present embodiment, the outer tube 20, the end cap group 30 and the outer cover 80 are each provided with two through holes 82. The perforations 82 are symmetrically arranged, and the perforations 82 are provided for the two locking screws 81. The outer tube 20, the end cap groups 30 and the outer covers 80 are tightly joined.

In order to further understand the characteristics of this creation, the use of technical means and the expected results, we will describe the use of this creation, and believe that we can have a deeper and more specific understanding of this creation, as follows:

Please refer to FIG. 3a and FIG. 3b, which are a cross-sectional view taken along line A-A of FIG. 1 and a partial enlarged view of FIG. 3a. The symmetrical arrangement described in this creation is further defined, which means a dividing line S passing through the center point of the spline shaft 10, the left and right sides of the dividing line S having an equal number of the track grooves 11. As shown in FIG. 3a, there are two track grooves 11 on the left and right sides of the dividing line S, and the track grooves 11 are paired and disposed correspondingly on the surface of the spline shaft 10. It is worth mentioning that the ball grooves 21 and the circulation channels 22 are also disposed correspondingly to the separation line S.

As shown in FIG. 3b, the track faces of the track grooves 11 and the ball grooves 21 are Gothic arcs, respectively. When the ball set 40 is accommodated in the ball passages 50 for cyclic movement, the surfaces of the balls 401 do not completely fit on the groove faces of the track grooves 11 and the ball grooves 21, but are dots. The state of contact (such as the position shown by contact B). In the present embodiment, from the middle of the groove surface of the track grooves 11, each of the lines extends to a center point of the spline shaft 10 by a connecting line L (the imaginary straight line), and the contact point B of the balls 401 is A straight line of the center point of the balls 401 forms an angle with the connecting line L The angle The angle is 40 degrees, but this creation is not limited to this. In other embodiments, the angle The angle is 45 degrees and is adjusted as needed.

Please refer to FIG. 4, which is a partial cross-sectional view of the first embodiment of the present invention. The two end cap sets 30 each have four such return passages 60, which correspond to the other components described above, but are not limited thereto. The recirculation passages 60 are located at the two ends of the ball passages 50 and the circulation passages 22, and the ball passages 50, the circulation passages 22 and the return passages 60 jointly form four of the ball circulation passages 70. In this embodiment, the number of the ball sets 40 is four, and the ball sets 40 are respectively accommodated in the ball circulation passages 70. Specifically, one of the ball passages 50, one of the circulation passages 22, and the two of the return passages 60 together form a ball circulation passage 70, and one of the ball circulation passages 70 accommodates a set of the ball groups 40.

Please refer to FIG. 5 , which is a perspective view of the end cap group of the first embodiment of the present invention. Each of the end cap groups 30 is recessed with four oil reservoirs 33. The oil reservoirs 33 are located between the first circulation holes 31 and the second circulation holes 32. The guide grooves 34 communicate with the oil storage grooves 33 and the second circulation holes 32. Since the consumption speed of the lubricating oil 331 is considered, only the second circulation holes 32 are communicated, but this is not limited thereto. In a preferred embodiment, the end cap groups 30 are recessed with eight guide grooves 34, and the guide grooves 34 respectively connect the oil reservoirs 33 with the first circulation holes 31 and the second portions. The circulation hole 32 has a better lubricating effect, but the lubricating oil 331 is consumed faster, and the service life of the ball spline group 100 is lowered.

Please refer to FIG. 6, which is an exploded view of the end cap group of the first embodiment of the present invention. The first cover body 35 is formed by a first cover body 35 and a second cover body 36. Each of the first cover bodies 35 is recessed with at least one recessed portion 351, and the second cover bodies 36 are at least A projection 361 corresponding to the recessed portions 351 is protruded. The inner side surface of the recessed portion 351 is a first curved groove 3511, and each of the protruding portions 361 has a second curved groove 3611, and the first curved groove 3511 and the second curved groove The 3611 collectively constitutes the return passages 60. Specifically, a first curved groove 3511 and a second curved groove 3611 together form a return passage 60.

Please refer to FIG. 7, which is a perspective view of a second embodiment of the present invention. Compared with the first embodiment, the structural difference of the second embodiment of the present invention is that one end of the outer cylinder 20 has a flange portion 23 which is formed by the inner surface of the outer cylinder 20 The direction of the outer side surface of the outer cylinder 20 is convex. Thereby, the application range of the ball spline group 100 of the present creation can be increased.

Hereby, the characteristics of this creation and its achievable expected effects are stated as follows:

The ball spline group 100 having the oil storage groove of the present invention is mainly provided by the oil storage groove 33 and the guide groove 34, which lubricates the ball group 40 to reduce the friction generated by the ball group 40 during movement. It increases the service life of the ball spline set 100.

In this way, the author has the following implementation effects and technical effects:

Firstly, the creation system stores the lubricating oil 331 through the oil storage tank 33, so that the ball spline group 100 has a space for storing oil, and the lubricating oil 331 is not required to be disassembled after the ball spline group 100 is disassembled, resulting in personnel. The problem of improper operation causes the lubricating oil 331 to splash or drip.

Secondly, the creation guides the lubricating oil 331 to lubricate the ball set 40 through the guiding groove 34, and reduces the friction generated by the ball set 40 during the movement, so that the ball spline group 100 has automatic lubrication during the movement. Efficacy, which can solve the problem of the amount of oil added, which leads to the overflow of oil due to excessive oil supply, or the lack of lubrication effect.

In summary, this creation has excellent progress in similar products, and at the same time, it has been inspected at home and abroad for technical information on such structures. The same structure has not been found in the literature. At the time of creation, new patent requirements have been established, and applications have been filed according to law.

However, the above-mentioned ones are only preferred embodiments of the present invention, and if there is no obvious remorse between the embodiments, the features may be combined with each other to replace the application. In addition, the equivalent structural changes that apply to the scope of this application and the scope of the patent application are included in the scope of the patent.

100‧‧‧Ball spline group with oil storage tank 10‧‧‧ Spline shaft 11‧‧‧ Orbital groove 20‧‧‧Outer cylinder 21‧‧‧Rolling groove 22‧‧‧Circulation passage 23‧‧‧Flange 30‧‧‧ End cap group 31‧‧‧ First circulation hole 32‧‧‧Second circulation hole 33‧‧‧ Oil storage tank 331‧‧‧Lubricant 34‧‧‧ Guide groove 35‧‧‧First cover 351 ‧‧‧Depression 3511‧‧‧First curved ditch 36‧‧‧Second cover 361‧‧‧Protruding 3611‧‧‧Second curved ditch 40‧‧‧Rolling group 401‧‧•Rolling ball 50 ‧‧‧Rolling Channel 60‧‧Return Channel 70‧‧‧Rolling Cycle 80‧‧‧Outer Cover 81‧‧‧Lock Screw 82‧‧‧Perforated AA‧‧‧Boundary Line B‧‧‧Contact Point S‧ ‧‧Separate line L‧‧‧ connection line ‧‧‧ Angle

Figure 1 is a perspective view of a first embodiment of the present creation.  Figure 2 is an exploded view of the first embodiment of the present creation.  Figure 3a is a schematic cross-sectional view taken along line A-A of Figure 1.  Figure 3b is a partial enlarged view of Figure 3a.  Figure 4 is a partial cross-sectional view showing the first embodiment of the present creation.  Figure 5 is a perspective view of the end cap assembly of the first embodiment of the present invention.  Figure 6 is an exploded view of the end cap assembly of the first embodiment of the present invention.  Figure 7 is a perspective view of a second embodiment of the present creation.  

Claims (10)

A ball spline group having an oil reservoir, the system comprising:
a spline shaft, on the surface of the spline shaft, at least one track groove is formed along the axial direction of the spline shaft;
An outer cylinder slidably sleeved on the spline shaft, and at least one ball groove is formed on an inner side surface of the outer cylinder along an axial direction of the outer cylinder, and the outer side surface and the inner side surface of the outer cylinder Intersecting at least one circulation channel along the axial direction of the outer cylinder, the ball groove corresponding to the track groove forming a ball passage;
a two-end cover group, the end cover sets are sleeved on the spline shaft, and are respectively disposed at two ends of the outer cylinder, and at least one return passage is disposed on one side of the end cover group facing the outer cylinder The two ends of the return channel are respectively a first circulation hole and a second circulation hole, the first circulation holes are connected to the ball channel, and the second circulation holes are connected to the circulation channel, the return channels, the The circulation channel and the ball channel together form a ball circulation passage; and at least one ball group, the ball group is composed of a plurality of balls, the ball group is accommodated in the ball circulation passage, and the ball group is in the ball circulation passage Medium move
The oil storage tank is configured to receive at least one oil storage tank, wherein the oil storage tanks are located at a side of the end cover group facing the outer cylinder, and the oil storage tanks are recessed The end cap group is recessed with at least one guiding groove, and the guiding grooves communicate with the oil storage tank and one or a combination of the first circulation holes and the second circulation holes to guide the lubricating oil to lubricate the Ball set. The ball spline group having an oil storage tank according to claim 1, wherein the oil storage tank is disposed between the first circulation holes and the second circulation holes, and the guide grooves are connected to the same The second circulation hole. The ball spline group having an oil reservoir according to claim 1, wherein the track groove is a groove recessed from a surface of the spline shaft toward a center point of the spline shaft, the track groove One end of the spline shaft is connected to the other end of the spline shaft. The ball spline group having an oil reservoir according to claim 1, wherein the ball groove is a groove recessed from an inner side surface of the outer tube toward an outer surface of the outer tube, the ball groove being One end of the outer cylinder is connected to the other end of the outer cylinder. The ball spline group of the oil storage tank according to the first aspect of the invention, further comprising two outer covers, the outer covers are sleeved on the spline shaft, and the outer covers are respectively disposed on the end caps The other side of the side of the outer tube, the outer tube, the end cap group and the outer cover are respectively provided with two perforations, the perforations are for the two locking screws to penetrate, so that the outer tube The end cap sets and the outer covers are tightly coupled. The ball spline group having an oil reservoir according to claim 1, wherein the number of the track grooves is four, and the track grooves are symmetrically disposed on a surface of the spline shaft. The ball spline group having an oil storage tank according to claim 6, wherein the number of the ball passages and the circulation passages is four, and the number of the return passages is eight, and the ball passages, The circulation channels and the return channels collectively form four of the ball circulation passages. The ball spline group of the oil storage tank according to the first aspect of the invention, wherein the end cap groups are respectively composed of a first cover body and a second cover body, and the first cover bodies respectively At least one recessed portion is recessed, and each of the second cover bodies protrudes from at least one protruding portion that matches the recessed portion. The ball spline group having an oil storage tank according to claim 8, wherein the concave portions are a first curved groove, and the protruding portions each have a second curved groove, and the same The first curved groove is combined with the second curved grooves into the return channels. The ball spline group having an oil reservoir according to claim 1, wherein one end of the outer cylinder has a flange portion, and the flange portion is from the inner surface of the outer cylinder to the outer cylinder The direction of the outer surface is convex.