Miniature cylindrical lead screw and spline integrated structure

Abstract

The utility model discloses a miniature cylindrical lead screw and spline integrated structure which comprises a lead screw and spline integrated shaft, a shaft hole, a key groove and a thread groove, first grooves are symmetrically formed in one end of the lead screw and spline integrated shaft, first balls in a cylindrical spline assembly are connected into the first grooves in a rolling mode, and the first balls are connected into second grooves in a rolling mode; according to the utility model, the cylindrical spline assembly and the ball screw spline assembly are connected on one shaft through the screw spline integrated shaft, so that the cylindrical spline assembly and the ball screw spline assembly are not two independent parts any more, the purposes of small size and low space requirement are easily realized, and miniaturization and cost saving are facilitated; the first ball and the second ball are driven to roll through rotation of the lead screw spline integrated shaft, then the cylindrical spline assembly is driven to do linear motion, the ball screw spline assembly is driven to do spiral motion, the linear motion mode and the spiral motion mode on one shaft are achieved, and the requirement for transmission diversification of the miniature lead screw spline pair is met.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission structures, in particular to a micro-cylindrical lead screw spline integrated structure. Background Technique

[0002] At present, the applications of cylindrical splines and ball screw splines are becoming more and more extensive. Both play an indispensable role in industrial equipment. The cylindrical spline has high transmission efficiency, which helps to reduce energy loss and improve the working efficiency of the equipment. At the same time, the cylindrical spline generates rolling friction during the movement process, greatly reducing the wear of the equipment and improving the service life of the parts. Its special closed environment helps to reduce noise; the ball screw spline has very high precision and is commonly used in fields such as precision automation and robots. It can efficiently transfer the input energy into output power and maximize the reduction of energy loss; due to the demand for reducing the volume and weight of current equipment and instruments, the demand for cylindrical lead screw splines is steadily increasing. However, at present, the cylindrical lead screw splines on the market are all split structures, that is, the cylindrical spline and the ball screw spline are two separate components. They not only have large sizes and high space requirements, which are not conducive to miniaturization and cost savings, but also can only complete a single motion mode and do not meet the requirements of diverse transmissions of the micro lead screw spline pair; therefore, it is very necessary to design a micro-cylindrical lead screw spline integrated structure. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a micro-cylindrical lead screw spline integrated structure to solve the problems that the existing cylindrical lead screw splines are all split structures, have large sizes, high space requirements, and are not conducive to miniaturization and cost savings.

[0004] To solve the above technical problems, the utility model provides the following technical solutions: a micro-cylindrical lead screw spline integrated structure, including a lead screw spline integrated shaft, a shaft hole, a keyway, and a thread groove. Symmetric first grooves are opened at one end of the lead screw spline integrated shaft. First balls in a cylindrical spline assembly are rollingly connected in the first grooves, and the first balls are rollingly connected in second grooves opened on a spline sleeve; a first helical groove is opened at the other end of the lead screw spline integrated shaft. Second balls in a ball screw spline assembly are rollingly connected in the first helical groove, and the second balls are rollingly connected in a second helical groove opened on a lead screw nut.

[0005] As a further technical solution of the utility model, the cylindrical spline assembly consists of a left end cover, a right end cover, a spline sleeve, a first screw, a second groove, a first ball, and a second screw. The left end cover is fixedly connected to the spline sleeve through the first screw, and the right end cover is fixedly connected to the spline sleeve through the second screw.

[0006] As a further technical solution of the present utility model, the ball screw spline assembly is composed of a second ball, a lead screw nut and a second spiral groove, and a lead screw sleeve is sleeved on the lead screw nut.

[0007] As a further technical solution of the present utility model, key grooves are provided on the spline sleeve.

[0008] As a further technical solution of the present utility model, thread grooves are provided on the lead screw nut.

[0009] As a further technical solution of the present utility model, a lead screw nut is connected to the lead screw spline integral shaft by means of a threaded fit.

[0010] As a further technical solution of the present utility model, a shaft hole is provided on the lead screw spline integral shaft.

[0011] The advantages of the micro-cylindrical lead screw spline integral structure provided by the present utility model are as follows: by symmetrically providing first grooves at one end of the lead screw spline integral shaft and a first spiral groove at the other end, the cylindrical spline assembly and the ball screw spline assembly are connected to one shaft. Furthermore, the cylindrical spline assembly and the ball screw spline assembly are no longer two separate components, making it easy to achieve the purpose of small size and low space requirements, which is conducive to miniaturization and cost savings in mass production; by applying an external force to rotate the lead screw spline integral shaft, the first balls supported by the first grooves and the second grooves are driven to roll in the sealed space formed by the left end cover, the right end cover, the first grooves and the second grooves, thereby driving the cylindrical spline assembly to move linearly along the track of the first grooves; at the same time, the second balls supported by the first spiral groove and the second spiral groove are driven to roll in the sealed space formed by the first spiral groove and the second spiral groove, driving the ball screw spline assembly to move spirally along the track of the first spiral groove, realizing two motion modes of linear and spiral on one shaft, meeting the requirements of diversified transmission of the micro lead screw spline pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a front view of the overall structure of the present utility model;

[0015] Figure 3 It is a cross-sectional view of the overall structure of the present utility model;

[0016] Figure 4 Schematic diagram of the cylindrical spline assembly of the present utility model;

[0017] Figure 5 Schematic diagram of the ball screw spline assembly of the present utility model.

[0018] In the figure: 1. Integrated shaft of screw and spline; 2. First groove; 3. Shaft hole; 4. Cylindrical spline assembly; 5. Keyway; 6. First helical groove; 7. Ball screw spline assembly; 8. Thread groove; 401. Left end cover; 402. Right end cover; 403. Spline sleeve; 404. First screw; 405. Second groove; 406. First ball; 407. Second screw; 701. Second ball; 702. Screw nut; 703. Second helical groove; 704. Screw sleeve. Specific embodiments

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] Please refer to the atta Figure 1 - atta Figure 5, an embodiment provided by the present utility model: a micro-cylindrical lead screw spline integrated structure, including a lead screw spline integrated shaft 1, a shaft hole 3, a keyway 5 and a thread groove 8. Symmetrically arranged first grooves 2 are formed at one end of the lead screw spline integrated shaft 1. The first balls 406 in the cylindrical spline assembly 4 are rollingly connected in the first grooves 2. The first balls 406 are rollingly connected in the second grooves 405, and the second grooves 405 are formed on the spline sleeve 403. A first spiral groove 6 is formed at the other end of the lead screw spline integrated shaft 1. The second balls 701 in the ball screw spline assembly 7 are rollingly connected in the first spiral groove 6. The second balls 701 are rollingly connected in the second spiral groove 703, and the second spiral groove 703 is formed on the lead screw nut 702. The cylindrical spline assembly 4 is composed of a left end cover 401, a right end cover 402, a spline sleeve 403, a first screw 404, a second groove 405, a first ball 406 and a second screw 407. The left end cover 401 is fixedly connected to the spline sleeve 403 through the first screw 404, and the right end cover 402 is fixedly connected to the spline sleeve 403 through the second screw 407. The ball screw spline assembly 7 is composed of a second ball 701, a lead screw nut 702 and a second spiral groove 703. A lead screw sleeve 704 is sleeved on the lead screw nut 702. A keyway 5 is formed on the spline sleeve 403. The keyway 5 is provided for installing a key to transmit torque. A thread groove 8 is provided on the lead screw nut 702. The lead screw nut 702 is connected to the lead screw spline integrated shaft 1 through thread fit. A shaft hole 3 is formed on the lead screw spline integrated shaft 1. The shaft hole 3 is for reducing the mass of the lead screw spline integrated shaft 1 and the centrifugal force generated during rotation.

[0022] Specifically, during use, first, the cylindrical spline assembly 4 and the ball screw spline assembly 7 are connected to one shaft by symmetrically arranging the first grooves 2 at one end of the lead screw spline integrated shaft 1 and the first spiral groove 6 at the other end. Furthermore, the cylindrical spline assembly 4 and the ball screw spline assembly 7 are no longer two separate components, which easily achieves the purpose of small size and small space requirements, and is conducive to miniaturization and cost savings in mass production. By applying an external force to rotate the lead screw spline integrated shaft 1, the first balls 406 supported by the first grooves 2 and the second grooves 405 are driven to roll in the closed space formed by the left end cover 401, the right end cover 402, the first grooves 2 and the second grooves 405, thereby driving the cylindrical spline assembly 4 to move linearly along the trajectory of the first grooves 2. At the same time, the second balls 701 supported by the first spiral groove 6 and the second spiral groove 703 are driven to roll in the closed space formed by the first spiral groove 6 and the second spiral groove 703, driving the ball screw spline assembly 7 to move spirally along the trajectory of the first spiral groove 6, realizing two motion modes of linear and spiral on one shaft, meeting the requirements of diverse transmission of the micro lead screw spline pair.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. Miniature cylindrical lead screw spline integrated structure, comprising a lead screw spline integrated shaft (1), a shaft hole (3), a keyway (5) and a thread groove (8), characterized in that: One end of the integrated ball screw and spline shaft (1) is symmetrically provided with first grooves (2). The first balls (406) in the cylindrical spline assembly (4) are rollingly connected in the first grooves (2). The first balls (406) are rollingly connected in second grooves (405) which are opened on the spline sleeve (403). A first helical groove (6) is opened at the other end of the integrated ball screw and spline shaft (1). The second balls (701) in the ball screw and spline assembly (7) are rollingly connected in the first helical groove (6). The second balls (701) are rollingly connected in second helical grooves (703) which are opened on the ball screw nut (702).

2. The micro-cylindrical lead screw spline integrated structure according to claim 1, wherein: The cylindrical spline assembly (4) consists of a left end cover (401), a right end cover (402), a spline sleeve (403), a first screw (404), second grooves (405), first balls (406) and a second screw (407). The left end cover (401) is fixedly connected to the spline sleeve (403) through the first screw (404), and the right end cover (402) is fixedly connected to the spline sleeve (403) through the second screw (407).

3. The integrated structure of a micro-cylindrical lead screw and spline according to claim 1, characterized in that: The ball screw and spline assembly (7) consists of second balls (701), a ball screw nut (702) and second helical grooves (703). A screw sleeve (704) is sleeved on the ball screw nut (702).

4. The micro-cylindrical lead screw spline integrated structure according to claim 2, wherein: Key grooves (5) are opened on the spline sleeve (403).

5. The micro-cylindrical lead screw spline integrated structure according to claim 3, characterized in that: Thread grooves (8) are provided on the ball screw nut (702).

6. The micro-cylindrical lead screw spline integrated structure according to claim 1, wherein: A ball screw nut (702) is connected to the integrated ball screw and spline shaft (1) by means of thread fit.

7. The micro-cylindrical lead screw spline integrated structure according to claim 6, characterized in that: A shaft hole (3) is opened on the integrated ball screw and spline shaft (1).

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