TWI551786B - Ball spline group - Google Patents

Description

Ball spline set

The present invention provides a ball spline set that is associated with a linear actuator.

As shown in FIG. 1 , the conventional ball spline group 10 mainly wears a retainer 11 and a bushing 12 on a spline shaft (not shown), and the outer peripheral surface of the retainer 11 is continuous. The closed elliptical return path 111 is used for infinite loop rolling of the plurality of balls 13, and one end of the bushing 12 is embedded with a circulating end piece 14 which forms a semicircular recess 141 corresponding to the return path of the retainer 111, the recess 141 increases the bearing area of the ball 13 when the return path 111 rotates, and prevents the ball 13 from coming off during the rotation; however, since the return path 111 on the retainer 11 is a closed elliptical return path, During assembly, a hole that communicates with the return path 111 must be provided on the bushing 12, and the ball 13 is installed by the hole of the bushing 12, which is inconvenient to install and has a lack of installation efficiency to be improved; The present inventors have devoted themselves to research and intensively conceived, and after many trials and developments, finally invented a ball spline group.

The invention provides a ball spline group, the main purpose of which is to improve the difficulty of assembly of the conventional ball spline group and the lack of assembly efficiency.

To achieve the foregoing objective, the present invention provides a ball spline group comprising: a spline shaft extending along an axial direction and having an outer surface, the outer surface of the spline shaft being axially spaced apart to define a plurality of outer rolling grooves; a splined shaft bushing having a perforation and the spline bushing The through hole of the sleeve has an inner surface, the inner surface defines a plurality of inner rolling grooves in the axial direction, the spline shaft bushing penetrates the spline shaft with the through hole, and the inner rolling groove and the outer rolling groove are formed as a first circulation element, a hollow cylindrical structure and having an outer surface, the outer surface of the first circulation element is provided with a plurality of first return passages, each of the first return passages being shaped into a U shape, and each of the The first return flow path respectively includes a load straight line segment, a non-load straight line segment and a first reflow segment, and the load straight line segment and the non-load straight line segment are spaced apart and one end extends to one end of the first circulation element, and the first The reflow section is coupled to the load straight line segment and the other end of the non-load straight line segment to form a U shape; the first circulation element is received in the perforation of the spline shaft bushing, and the load straight line segment of the first circulation element is opposite The spline shaft bushing An inner rolling groove and an outer rolling groove of the spline shaft; and a second circulating element having a hollow structure having an outer surface, the outer surface of the second circulating element being provided with a plurality of second return channels, each of the second return channels Included in the at least one second reflow section; the second recirculating component is received in the perforation of the splined bushing, and the two ends of the second recirculation section of the second circulating component respectively communicate with the load straight section and the non-load An open end of the straight line segment, the second recirculation section and the first return flow path form a return channel, and the return flow channel is configured to set a plurality of balls and can infinitely circulate in the return flow channel.

The invention provides a first first circulating element and a second circulating element, and the first circulating element is open to the end in a straight line segment to provide beading, and the ball can be directly loaded into the straight line segment of the return channel, thereby reducing the difficulty of the beading, Improve the efficiency of beading, and thus reduce production costs and improve Economic benefits.

"Knowledge Technology"

10‧‧‧Ball Spline Set

11‧‧‧ Keeper

111‧‧‧Return path

12‧‧‧ bushing

13‧‧‧ balls

14‧‧‧Circular end pieces

141‧‧‧ recess

"this invention"

20‧‧‧ Splined shaft

21‧‧‧ outer surface

211‧‧‧External rolling ditch

30‧‧‧Spread shaft bushing

31‧‧‧Perforation

311‧‧‧ inner surface

312‧‧‧Inside rolling groove

313‧‧‧ Ring groove

40‧‧‧First cycle component

41‧‧‧ outer surface

42‧‧‧First arrival

43‧‧‧ first joint end

431‧‧‧Combination Department

44‧‧‧First return channel

441‧‧‧Load straight line segment

442‧‧‧Unloaded straight line segment

443‧‧‧First recirculation section

50‧‧‧second cycle component

51‧‧‧ outer surface

52‧‧‧Secondary

53‧‧‧Second junction

531‧‧‧With the joint department

54‧‧‧Second return channel

541‧‧‧Second reflow section

542‧‧‧Second straight segment

60‧‧‧ balls

70‧‧‧C-shaped buckle

X‧‧‧ axial

Ls‧‧‧Line length

Lt‧‧‧second cycle element length

R‧‧‧second reflow radius value

Figure 1 is a partial schematic view of a conventional ball spline group.

Fig. 2 is a perspective view showing the three-dimensional combination of the ball spline group of the present invention.

Fig. 3 is a schematic exploded view showing the three-dimensional structure of the ball spline group of the present invention.

Fig. 4 is a plan view showing the combination of a part of the components of the ball spline group of the present invention.

Fig. 5 is a schematic view showing the combination of the first circulation element and the second circulation element of the ball spline group of the present invention.

Fig. 6 is a schematic view showing another embodiment of the first circulation element and the second circulation element of the ball spline group of the present invention.

In order to enable your review committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [simplified description of the drawings] for details:

A preferred embodiment of the ball spline set of the present invention, as shown in Figures 2 through 5, includes a spline shaft 20 extending along an axial direction X and having an outer surface 21, the spline shaft The outer surface 21 of the 20 defines a plurality of outer rolling grooves 211 spaced apart in the axial direction X; a splined bushing 30 having a through hole 31, and the through hole 31 of the splined bushing 30 has an inner surface 311, the inner surface 311 opens a plurality of inner rolling grooves 312 along the axial direction X. The spline shaft bushing 30 is sleeved with the spline shaft 20 by the through hole 31, and the inner rolling groove 312 of the spline shaft bushing 30 and the spline shaft 20 The outer rolling groove 211 is formed as a load path, and the inner surface 311 of the perforation 31 of the spline shaft bushing 30 is further provided with a ring groove 313; A first circulating element 40 has a hollow cylindrical structure and has an outer surface 41. The two ends of the first circulating element 40 are respectively a first abutting end 42 and a first connecting end 43. The first circulating element 40 is The outer surface 41 is provided with a plurality of first return channels 44, each of the first return channels 44 is shaped into a U shape, and each of the first return channels 44 includes a load straight line segment 441, a non-load straight line segment 442, and a first The returning section 443, the load straight section 441 and the non-load straight section 442 are arranged in parallel and the first joint end 43 extending to one end of the first circulating element 40 is open, and the load straight section 441 and the non-load straight section 442 The same straight line segment length Ls is formed, and the first return flow segment 443 is coupled to the load straight line segment 441 and the other end of the non-load straight line segment 442 constitutes a U shape, and the load straight line segment 441 is a through-type, and the non-load The straight section 442 and the first reflow section 443 are all in the form of a groove having a bottom surface, and the first joint end 43 of the first circulation element 40 is provided with a plurality of joints 431; the first loop element 40 is accommodated in the Splined shaft bushing 30 In the hole 31, the load straight line segment 441 of the first circulation element 40 is opposite to the inner rolling groove 312 of the spline shaft bushing 30 and the outer rolling groove 211 of the spline shaft 20; a second circulating element 50, hollow circle The ring structure has a second circulating element length Lt in the axial direction X, the second circulating element length Lt is greater than or equal to 1/10 of the straight line segment length Ls, and the second circulating element length Lt is less than or equal to 1/3 of the straight line The length of the second loop element 50 has an outer surface 51, and the two ends of the second loop element 50 are a second abutting end 52 and a second joint end 53, respectively. The outer surface 51 is provided with a plurality of second return passages 54, each of the second return passages 54 includes at least a second recirculation section 541, the second reflow section 541 has a semicircular groove structure, and the second reflow section 541 has a second reflow section. a segment radius value R, and the second cycle element length Lt is greater than or equal to the second recirculation segment radius value R and less than or equal to three times the second recirculation segment radius value R; and the second end portion 53 of the second circulation element 50 Set a complex combination The engaging portion 531 of the second circulating element 50 can be coupled to the joint portion 431 of the first circulating element 40. The joint portion 431 and the mating joint portion 531 of the embodiment are concave-convex fitting structures; The circulatory element 50 is received in the through hole 31 of the splined bushing 30, and the second end of the circumscribing element is attached to the first end 43 of the first circulatory element 40 The joint portion 431 is coupled to each of the mating joint portions 531, and the two ends of the second recirculation sections 541 of the second circulation element 50 are respectively connected to the end of the load straight line segment 441 and the non-load straight line segment 442. The second reflow section 541 of the second circulation element 50 and the first return passage 44 of the first circulation element 40 respectively form a return passage, and the return passage has a plurality of balls 60 and can be infinitely cycled in the return passage; The C-shaped buckle 70 is received in the annular groove 313 at both ends of the spline bushing 30 and adjacent to the first abutting end 42 of the first circulating element 40 and the second abutting end 52 of the second circulating element 50, respectively.

The above is the structural configuration and features of the ball spline group of the present invention, and the ball spline group of the present invention can be assembled to the spline bushing before the first revolving element 40 is assembled. 30, the load straight line segment 441 of the first circulation element 40 and the non-load straight line segment 442 extend to the first joint end 43 to be completely open, so that the load straight line segment 441 and the non-load straight line can be The segment 442 extends to the first joint end 43 for beading, which reduces the difficulty of assembling the ball 60, and improves the efficiency of assembling the ball 60, and further reduces the production cost; and the ball 60 is filled into the first cycle. After the component 40, the second circulating component 50 is assembled with the ball 60 outside the spline bushing 30, and then the second circulating component 50 equipped with the ball 60 is assembled into the through hole 31 of the spline bushing 30. And the fitting portion 531 of the second circulating element 50 is coupled to the joint portion 431 of the first circulating element 40 to complete the assembly; of course, the C-shaped portion is respectively disposed in the annular groove 313 at both ends of the splined bushing 30 The buckle 70 can further improve the stability of the overall structure. set In the embodiment of the second to fifth embodiments, the second return passage 54 of the second circulation element 50 is a second reflow section 541 including only a semicircular groove structure, but the implementation of the second return passage 54 The second return channel 54 is further extended from the two ends of the second reflow segment 541 to a second portion as shown in FIG. 6 except that the second reflow segment 541 is included. a straight line segment 542, and after assembly, the second straight line segment 542 of the second circulating element 50 respectively communicates with the load straight line segment 441 of the first circulating element 40 and the non-load straight line segment 442, and the second of the second circulating element 50 The straight line segments 542 respectively correspond to the structural form of the load straight line segment 441 or the non-load straight line segment 442 that is formed therewith; that is, the second straight line segment 542 that is in communication with the load straight line segment 441 is shaped to be the same as the load straight line segment 441 The through-line configuration, the second straight line segment 542 communicating with the non-load straight line segment 442 is formed into the same groove structure configuration as the non-load straight line segment 442 having a bottom surface; and the change in the structural form does not affect the desired situation in the present invention. The same purpose and efficacy.

As can be seen from the above, the present invention provides that the first circulating element 40 and the second circulating element 50 are separated into two members, and the first circulating element 40 is extended by the load straight line segment 441 and the non-load straight line segment 442. A joint end 43 is provided for assembling the ball 60, and the ball 60 can be directly loaded into the straight section of the return passage, thereby reducing the difficulty of the beading, improving the efficiency of the beading, and improving the overall production efficiency and creating higher economic efficiency.

20‧‧‧ Splined shaft

21‧‧‧ outer surface

211‧‧‧External rolling ditch

30‧‧‧Spread shaft bushing

31‧‧‧Perforation

311‧‧‧ inner surface

312‧‧‧Inside rolling groove

313‧‧‧ Ring groove

40‧‧‧First cycle component

41‧‧‧ outer surface

42‧‧‧First arrival

43‧‧‧ first joint end

431‧‧‧Combination Department

44‧‧‧First return channel

441‧‧‧Load straight line segment

442‧‧‧Unloaded straight line segment

443‧‧‧First recirculation section

50‧‧‧second cycle component

51‧‧‧ outer surface

52‧‧‧Secondary

53‧‧‧Second junction

531‧‧‧With the joint department

54‧‧‧Second return channel

541‧‧‧Second reflow section

60‧‧‧ balls

70‧‧‧C-shaped buckle

X‧‧‧ axial

Claims (8)

A ball spline set comprising: a spline shaft extending along an axial direction and having an outer surface, the outer surface of the spline shaft being axially spaced apart to open a plurality of outer rolling grooves; a spline shaft bushing having a Perforating, and the perforation of the spline bushing has an inner surface, the inner surface opening a plurality of inner rolling grooves in the axial direction, the spline shaft bushing is sleeved with the spline shaft, and the inner rolling groove is Forming a load path between the outer rolling grooves; a first circulating element having a hollow cylindrical structure and having an outer surface; the outer surface of the first circulating element is provided with a plurality of first return passages, and each of the first return passages is formed The U is in the form of a U, and each of the first return passages includes a load straight line segment, a non-load straight line segment and a first reflow segment, and the load straight line segment and the non-load straight line segment are spaced apart and one end extends to the first circulating element. One end is open, and the first reflow section is coupled to the load straight line segment and the other end of the non-load straight line segment constitutes a U shape; the first circulation element is received in the perforation of the spline shaft bushing, and the first Load of a cyclic component The line segment is opposite to the inner rolling groove of the spline bushing and the outer rolling groove of the spline shaft, and the load straight line segment has the same straight line length as the non-load straight line segment, and the load straight line segment is a through-type, and The non-load straight line segment and the first reflowing segment are all in the form of a groove structure having a bottom surface; and a second circulating element is a hollow structure having an outer surface, and the outer surface of the second circulating element is provided with a plurality of second return channels, Each of the second return passages includes at least a second reflow section; the second circulation element is received in the through hole of the spline shaft bushing, and the two ends of the second recirculation section of the second circulation element respectively communicate with the a straight line segment and an open end of the non-load straight line segment, the second recirculation section and the first return channel form a return channel, and the return channel is configured to set a plurality of balls and An infinite loop can be performed in the return channel, the second loop element has a second loop element length in the axial direction, the second loop element length is greater than or equal to 1/10 of the straight line length, and the second loop element length is less than or equal to 1/3 of the length of the straight line segment. The ball spline group of claim 1, wherein the second reflow section is a semi-circular groove structure. The ball spline group according to claim 1, wherein the load straight line segment and the non-load straight line segment are arranged in parallel intervals. The ball spline group of claim 1, wherein the first end of the first circulating element is a first abutting end and a first connecting end, and the load straight line segment and the non-load straight line segment extend to the The first joint end is open, and the first joint end of the first loop element is provided with a plurality of joint portions, and the two ends of the second loop element are respectively a second abutting end and a second joint end, the second loop A plurality of mating joints are disposed on the second joint end of the component, and the mating joint of the second loop component may be coupled to the joint of the first loop component. The ball spline set according to claim 4, wherein the joint portion and the mating joint portion are a concave-convex fitting structure. The ball spline set of claim 4, wherein the inner surface of the perforated end of the spline bushing is further provided with a ring groove, and each of the ring grooves respectively receives a C-shaped buckle, and Each of the C-shaped buckles is adjacent to the first abutting end of the first circulating element and the second abutting end of the second circulating element. The ball spline set according to claim 1, wherein the second circulation element has a second circulation element length in the axial direction, and the second reflow section has a second recirculation section radius value, and the The length of the second circulating element is greater than or equal to the radius of the second recirculation section and is less than or equal to three times The second recirculation section radius value. The ball spline group of claim 2, wherein the second return channel comprises the second reflow section and a second straight section extending from both ends of the second reflow section, the second loop Each of the second straight line segments of the component respectively communicates with the load straight line segment and the non-load straight line segment, and each of the second straight line segments respectively corresponds to a structural form of the load straight line segment or the non-load straight line segment that is formed in communication therewith.