Assembly comprising screw and ball screw pair

Abstract

The assembly comprises a rod body and a cylinder body, a matching groove is formed in the cylinder body, continuous matching threads are arranged on the inner wall of the matching groove, a plurality of layers of ball grooves are obliquely formed in the peripheral wall of the rod body, the height of each layer of ball groove is the same as that of the two layers of matching grooves, and the height of each layer of ball groove is larger than that of the other layer of matching groove. The distance between every two adjacent ball grooves is the same as that between every two adjacent matched threads, the heads and the tails of the ball grooves are connected through transition grooves, and a plurality of rolling bodies are arranged in the ball grooves in a rolling fit mode. The whole structure is simpler and more compact, the using stability of the structure is guaranteed, meanwhile, the length of the lead screw is effectively shortened, and the good using effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of components comprising screw rod and ball screw pair. BACKGROUND

[0002] Ball screw pair usually uses the end face of nut piece to conduct or bear pressure, and the screw rod piece, as torque input end, is usually supported in cantilever or supported at both ends. When supported in cantilever, circulator is arranged on the nut, and the length of the nut is affected by the arrangement of stroke, circulator and cylinder (nut seat) structure, so that the length often exceeds the expected length or is difficult to shorten, and the cantilever is lengthened. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides a kind of components comprising screw rod and ball screw pair, and the overall structure is more simple and compact, effectively shortens the length of screw rod while ensuring the stability of the structure, and has good use effect.

[0004] To achieve the above object, the utility model provides a kind of components comprising screw rod and ball screw pair, which comprises a rod body and a cylinder, the cylinder is formed with a matching groove, the inner wall of the matching groove is provided with a continuous matching thread, the outer peripheral wall of the rod body is obliquely provided with a plurality of layers of ball running grooves, each layer of ball running grooves has the same height as two layers of matching grooves, the spacing between adjacent ball running grooves is the same as the spacing between adjacent matching threads, the first and last ball running grooves are connected by a transition groove, and a plurality of rolling bodies are rolling fitted in the ball running grooves.

[0005] The beneficial effects of such arrangement are as follows: by arranging the circulation channel on the rod body as a rotating body, the axial length of the screw rod body can be effectively shortened, and by arranging the ball running grooves in this way, the impact change caused by the circulation and reversing of the rolling bodies can be effectively reduced. As an optimization, the trajectory motion curve is designed according to the form of the rolling bodies, so that the rolling bodies experience small resistance during reversing, the overall structure is simple, the operation of the rolling bodies is free of sudden change and slow acceleration change, there is no impact effect, and unnecessary power loss is reduced.

[0006] As a further arrangement of the utility model, the transition grooves in adjacent ball running grooves are staggered.

[0007] The beneficial effects of such arrangement are as follows: by arranging the transition grooves in adjacent ball running grooves in this way, the overall structural layout is more reasonable, the ball running grooves can be arranged more compactly, the gap position of the height difference can be used as the starting position of adjacent ball running grooves, the space utilization of the structure is improved, and the use reliability of the structure is ensured.

[0008] As a further arrangement of the utility model, one end of the cylinder is closed.

[0009] The beneficial effect of the arrangement is that the original structure of the back cover for the pressure bearing surface is cancelled, the one end of the cylinder is closed, and the production is more convenient and has good use reliability.

[0010] As a further arrangement of the utility model, the oil injection groove is arranged through each ball groove along the length direction of the rod body on the outer circumferential wall of the rod body.

[0011] The beneficial effect of the arrangement is that the lubricating oil can be conveniently supplemented, the use efficiency of the structure is improved, the structure is simple, easy to realize and efficient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 The structure of the embodiment of the utility model is shown;

[0013] Fig. 2 The front view of the rod body in the embodiment of the utility model is shown;

[0014] Fig. 3 The rear view of the rod body in the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0015] The utility model provides a kind of embodiment of the assembly comprising screw rod and ball screw pair, as shown in Figs. 1 to 3 The outer circumferential wall of the rod body 2 is obliquely provided with a plurality of ball groove 21, each ball groove 21 is the same height with two layers of cooperating grooves, the spacing between adjacent ball groove 21 is the same with the spacing between adjacent cooperating threads, the head and tail of the ball groove 21 are connected by transition groove 22, and a plurality of rolling bodies 3 are rolling fitted in the ball groove 21.The beneficial effect of the arrangement is that the rod body 2 is arranged as a rotating body, the circulation channel is arranged on the rod body 2, the axial length of the screw rod body 2 can be effectively shortened, the impact change caused by the circulation of the rolling body 3 can be effectively reduced by such ball groove 21 layout, as an optimization, the trajectory motion curve is designed according to the form of the rolling body 3, so that the rolling body 3 is subjected to small resistance in the reversing process, the overall structure is simple, the operation of the rolling body 3 can be ensured without mutation and slow acceleration change, without impact effect, and unnecessary power loss is reduced.

[0016] As a further arrangement of the embodiment, the transition grooves 22 in adjacent ball grooves 21 are staggered.The beneficial effect of the arrangement is that the overall structure layout is more reasonable, the ball groove 21 can be arranged more compactly, the gap position of the height difference can be used as the starting position of adjacent ball groove 21, so as to improve the space utilization rate of the structure and ensure the use reliability of the structure.

[0017] As a further arrangement of the present embodiment, the barrel 1 is closed at one end. The beneficial effect of such an arrangement is that the original structure of the rear cover for the pressure-bearing surface is cancelled, and the barrel 1 is closed at one end, which is more convenient for processing and production, and has good use reliability.

[0018] As a further arrangement of the present embodiment, the rod body 2 is provided with an oil injection groove 4 passing through each ball track 21 on the outer peripheral wall of the rod body 2 in the length direction of the rod body 2, and the oil injection groove 4 is narrower than the ball track 21. The beneficial effect of such an arrangement is that it is convenient to supplement the lubricating oil, improves the use efficiency of the structure, and at the same time, the structure is simple, easy to realize, and efficient and convenient to operate.

[0019] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical scheme of the present application are included in the protection scope of the present application.

Claims

1. An assembly comprising a screw and a ball screw pair, comprising a rod body and a barrel, characterized in that: A matching groove is formed in the cylinder, and a continuous matching thread is provided on the inner wall of the matching groove. Several layers of ball grooves are obliquely provided on the outer peripheral wall of the rod. Each layer of ball groove has the same height as the two layers of matching grooves. The spacing between adjacent ball grooves is the same as the spacing between adjacent matching threads. The head and tail of the ball groove are connected by a transition groove, and several rolling bodies are rolling in the ball groove.

2. The assembly comprising a screw and a ball screw pair according to claim 1, characterized in that: The transition grooves in adjacent ball grooves are staggered.

3. The assembly comprising a screw and a ball screw pair according to claim 1, wherein: One end of the cylinder is sealed.

4. The assembly comprising a screw and a ball screw pair according to claim 1, wherein: An oil filling groove passing through each ball groove is provided on the outer peripheral wall of the rod body along the length direction of the rod body, and the oil filling groove is narrower than the ball groove.

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