External circulation ball screw transmission device

Abstract

An external circulation ball screw transmission device comprises a lead screw and a nut arranged outside the lead screw in a sleeving mode, a spiral groove is formed between the lead screw and the nut, a reverser groove is formed in the nut, the external circulation ball screw transmission device further comprises a reverser assembly, the reverser assembly comprises a reverser and a fixing plate, the end face of one side of the reverser abuts against the groove bottom of the reverser groove, and the fixing plate is arranged on the reverser. The reverser is provided with a circulating channel spliced with the spiral channel, and the fixing plate is tightly pressed on the reverser to be matched with the groove bottom of the reverser groove so as to fix the reverser. The utility model has the beneficial effects that the fixing plate and the nut are fixed through the riveting and pressing fixing piece, and the fixing plate is pressed on the outer surface of the reverser to be matched with the reverser groove so as to realize the fixing between the reverser and the nut; in addition, due to the fact that no welding seam exists between the reverser and the nut, the external circulation ball screw transmission device in the scheme is more stable in the working process, and the service life of the external circulation ball screw transmission device is prolonged.

Description

Technical Field

[0001] The utility model relates to a transmission device, in particular to an external circulation ball screw transmission device. Background Art

[0002] The external circulation ball screw transmission is a high-efficiency, high-precision linear motion system, which is widely used in the fields of automation and precision machinery for its low friction, high load capacity and compact design. It uses an external circulation system to make the balls roll between the screw and the nut, reducing noise and improving transmission efficiency. It also has the advantages of easy maintenance and a variety of models to choose from.

[0003] In an externally circulating ball screw drive, the installation of the reverser usually involves positioning the reverser to ensure that it matches the screw's threads and ball circulation path, and then securing it in place in the nut, usually by welding. The key is to ensure that the ball guide grooves inside the reverser are precisely aligned with the ball circulation path in the nut, allowing the balls to transfer smoothly from one end of the nut to the other.

[0004] However, the above-mentioned welding fixing method of the reverser has the following shortcomings: welding will form a welding seam between the reverser and the nut, and the welding seam will not only cause stress concentration due to the residual stress at the welding seam when the reverser is working, thereby increasing the risk of cracks and fractures; at the same time, the heat generated during welding will affect the material properties around it, thereby affecting the structural integrity of the nut and the reverser. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an external circulation ball screw transmission device with higher operating stability.

[0006] To achieve the above-mentioned objectives, the technical scheme of the utility model is as follows: an external circulation ball screw transmission device, including a screw and a nut sleeved on the outside of the screw, a spiral groove for the ball to rotate therein is formed between the screw and the nut, the nut is provided with a reverser groove, and also includes a reverser assembly, the reverser assembly includes a reverser and a fixing plate, one side end face of the reverser abuts against the bottom of the reverser groove, the reverser is provided with a circulation channel spliced ​​with the spiral groove, the fixing plate is pressed on the other end face of the reverser to cooperate with the bottom of the reverser groove to fix the reverser, a plurality of fixing holes are provided on the fixing plate and each fixing hole is staggered with the reverser groove, a fixing piece is passed through each of the fixing holes and the fixing between the fixing plate and the nut is achieved by riveting the fixing piece.

[0007] The beneficial effects of the utility model are: the fixing between the fixing plate and the nut is achieved by riveting the fixing piece, and the fixing plate is pressed on the outer surface of the reverser to cooperate with the bottom of the reverser groove to achieve the fixing between the reverser and the nut, and a stable fixing relationship is formed between the reverser and the nut by this fixing method, and since there is no welding seam between the reverser and the nut, the external circulation ball screw transmission device in the above scheme is more stable during operation, thereby improving the service life of the scheme. And since the stopper is hidden in the reverser groove, the reverser can also be hidden in the reverser groove after installation, and the nut will not have too many changes in appearance, so that its structure is more compact.

[0008] Furthermore, the reverser groove is obliquely arranged on the nut and the shape of the reverser groove is projected onto the spiral groove to constitute a part of the spiral groove. A clamping groove is provided on the nut corresponding to the fixing plate and the clamping groove and the reverser groove partially overlap in position, and the depth of the clamping groove is greater than the height of the fixing plate.

[0009] The position of the reverser groove corresponds to the position of one of the grooves in the spiral groove, so that after the reverser is installed, its circulation groove can be spliced ​​on the spiral groove to become a part of it. The clamping groove, which partially overlaps with the reverser groove and has a groove depth greater than the height of the fixing plate, can prevent the upper surface of the fixing plate from exceeding the outer surface of the nut after the fixing plate is installed, so that the nut in this solution is more compact in structure to adapt to various miniaturized installation environments.

[0010] Furthermore, a penetration hole penetrating to the inner side of the spiral channel is provided at a position corresponding to the fixing hole in the clamping groove, and the penetration hole and one or two openings of the circulation channel are located in the same spiral channel.

[0011] One or two openings of the circulation channel and the through hole are located in the same spiral channel, so that the ball will not pass through the position of the through hole when circulating and rolling, that is, even if the fixing piece passes through the through hole to reach the spiral channel, it will not affect the circulation rotation of the ball; at the same time, through the above-mentioned arrangement, the fixing piece can be penetrated in the spiral channel to strengthen the fixing effect of the fixing piece on the fixing plate and the nut, so as to improve the connection stability between the two.

[0012] Furthermore, the reverser includes a reverser seat and a reverser cover, the circulation channel is located between the reverser seat and the reverser cover, and one of the reverser seat and the reverser cover close to the spiral channel is made of metal material.

[0013] One of the reverser seat and the reverser cover is made of metal material and is arranged close to the spiral groove. The hardness of the metal can prevent the balls from falling out of the circulating raceway and thus prevent them from forming a circulating rotation, thereby improving the reliability of the circulating rotation of the balls.

[0014] Furthermore, the reverser seat is arranged close to the spiral channel, and both ends of the reverser seat are provided with a protruding guide portion, and the guide portion is arranged with a pointed end from an end close to the circulation channel toward an end close to the spiral channel.

[0015] The guide portion of the reverser seat is pointed from one end close to the circulation channel toward one end close to the spiral channel, that is, the width of the guide portion gradually decreases from one end close to the circulation channel toward one end close to the spiral channel, so as to facilitate guiding the ball from the spiral channel into the circulation channel, thereby further improving the reliability of the ball circulation rotation.

[0016] Furthermore, the surface of the guide portion in contact with the ball is arranged in an arc shape.

[0017] The contact surface of the guide surface is arranged in an arc shape so that the ball can be better fitted on the guide portion and the arc-shaped outer surface will not scratch the surface of the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric diagram of an embodiment of the utility model;

[0019] Figure 2 This is an axonometric view of a nut according to an embodiment of the utility model;

[0020] Figure 3 This is a disassembly diagram of a nut according to an embodiment of the utility model;

[0021] Figure 4 This is a disassembled diagram of the reverser of the embodiment of the utility model;

[0022] Figure 5 A cross-sectional view of an embodiment of the utility model;

[0023] Figure 6 It is a cross-sectional view of the reverser slot of an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The utility model embodiment of an external circulation ball screw transmission device is as follows Figure 1-6 As shown: it includes a screw 1, a nut 2 sleeved on the screw 1, and a reverser assembly 5 installed on the nut 2. A spiral channel 3 is formed between the screw 1 and the nut 2, so that the ball 4 can circulate and rotate in the spiral channel 3. A reverser groove 21 whose shape corresponds to one of the channel positions in the spiral channel 3 and is connected to the inside of the spiral channel 3 is provided on the outer surface of the nut 2. In this embodiment, there are two reverser grooves 21. A clamping groove 22 is also provided on the outer surface of the nut 2. The clamping groove 22 is transversely arranged on the outer surface of the nut 2 and partially overlaps with the two reverser grooves 21. The clamping groove 22 is provided with a through hole 221 leading to the spiral channel 3.

[0025] The reverser assembly 5 includes a reverser 51 composed of a reverser cover 511 away from the spiral channel 3 and a reverser seat 512 close to the spiral channel 3, a fixing plate 52 and a fixing member 54. A circulation channel 53 is formed between the reverser cover 511 and the reverser seat 512, which is spliced ​​with the spiral channel 3 after the reverser 51 is installed. The fixing plate 52 is pressed and arranged on the outer surface of the reverser cover 511 and the fixing plate 52 is placed in the pressing groove 22. The fixing hole 521 is arranged on the fixing plate 52 at the position corresponding to the through hole 221, and the fixing member 54 passes through the fixing hole 521 and the through hole 221 in sequence to complete the fixing of the reverser 51.

[0026] A guide portion 513 is provided at both ends of the reverser seat 512 corresponding to the circulation channel 53. The guide portion 513 is set in a pointed shape from the end close to the circulation channel 53 toward the end close to the spiral channel 3. The contact surface 5131 that contacts the ball 4 is set in an arc shape to facilitate the ball 4 to enter and form a circulating rotation.

[0027] The following is a brief description of the installation process of this embodiment: the assembled deflector 51 is placed in the deflector groove 21, so that the lower surface of the deflector 51 abuts against the groove bottom 211 of the deflector groove 21, and then the fixing member 54 is passed through the penetration hole 221 and the fixing hole 521 of the fixing plate 52 is aligned with the fixing member 54 and placed in the clamping groove 22, and then the deflector 51 and the nut 2 are fixed by riveting. Finally, the nut 2 is sleeved on the screw 1, so as to form a spiral channel 3 between the nut 2 and the screw 1 and install the ball 4 therein.

[0028] It should be explained that, in this embodiment, there are three fixing members 54 and two deflectors 51. The two openings of the circulation channel 53 of the deflector 51 are located at the two ends of the fixing members 54, that is, the opening of the circulation channel 53 for the ball 4 to enter is located before one of the fixing members 54, and the ball 4 is located after the other fixing member 54 when it exits from the opening of the circulation channel 53; and the opening position of the circulation channel 53 for the ball 4 to enter the other deflector 51 is located before the last fixing member 54. The following is a brief description of the use process of this embodiment: the ball 4 is screwed in the screw. When it rotates in the spiral channel 3 and moves to the reverser 51, since one of the openings of the circulation channel 53 and the fixing part 54 are in the same channel in the spiral channel 3, the opening of the circulation channel 53 is located at the front end of the movement trajectory of the ball 4 compared to the fixing part 54 and the outlet of the circulation channel 53 is located at the rear end of the movement trajectory of the ball 4 compared to the other fixing part 54. Therefore, the ball 4 can enter the circulation channel 53 under the guidance of the guide part 513 without colliding with the fixing part 54, thereby repeatedly realizing the circulation rotation of the ball 4 in the spiral channel 3.

[0029] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An external circulation ball screw transmission device, comprising a screw and a nut sleeved outside the screw, a spiral channel for the ball to rotate therein is formed between the screw and the nut, and a reverser groove is provided on the nut, characterized in that: It also includes a reverser assembly, which includes a reverser and a fixing plate, one side end face of the reverser rests on the bottom of the reverser groove, the reverser is provided with a circulation channel spliced ​​with the spiral channel, the fixing plate is pressed on the other end face of the reverser to cooperate with the bottom of the reverser groove to fix the reverser, a plurality of fixing holes are provided on the fixing plate and each fixing hole is staggered with the reverser groove, a fixing piece is passed through each fixing hole and the fixing between the fixing plate and the nut is achieved by riveting the fixing piece.

2. The external circulation ball screw transmission device according to claim 1, characterized in that: The reverser groove is obliquely arranged on the nut and its shape is projected onto the spiral groove to form a part of the spiral groove. A clamping groove is provided on the nut corresponding to the fixing plate and the clamping groove and the reverser groove partially overlap in position. The depth of the clamping groove is greater than the height of the fixing plate.

3. The external circulation ball screw transmission device according to claim 2 is characterized in that: A penetration hole penetrating to the inner side of the spiral channel is provided in the compression groove at a position corresponding to the fixing hole. The penetration hole and one or two openings of the circulation channel are located in the same spiral channel.

4. The external circulation ball screw transmission device according to claim 1, characterized in that: The reverser comprises a reverser seat and a reverser cover, the circulation channel is located between the reverser seat and the reverser cover, and one of the reverser seat and the reverser cover close to the spiral channel is made of metal material.

5. The external circulation ball screw transmission device according to claim 4 is characterized in that: The reverser seat is arranged close to the spiral channel, and both ends of the reverser seat are provided with a protruding guide part, and the guide part is arranged with a pointed end from an end close to the circulation channel toward an end close to the spiral channel.

6. The external circulation ball screw transmission device according to claim 5, characterized in that: The surface of the guide portion contacting the ball is arranged in an arc shape.

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