The ball screw nut of the external reverser is fixed with a pin

Abstract

A ball screw nut with an external deflector fixed with a pin comprises a nut body, a pair of mounting grooves for mounting the external deflector are provided on the outer side wall of the nut body, an external deflector connected to the inside of the nut body is installed in each mounting groove, the external deflector comprises a first component and a second component spliced ​​together, and also comprises a fixing mechanism for fixing the external deflector in the mounting groove, the fixing mechanism comprises an external fixing member fixing the outer end of the first component and the outer end of the second component and an internal fixing member fixing the inner end of the first component and the inner end of the second component. The present invention can fix the inner end of the external deflector with the aid of a pin, so that the inner end of the external deflector is more stable.

Description

Technical Field

[0001] The invention relates to a ball screw, in particular to a ball screw nut using a latch to assist in fixing an external reverser. Background Art

[0002] Ball screws are the most commonly used transmission elements in tool machinery and precision machinery. Their main function is to convert rotational motion into linear motion, or torque into axial repetitive force, while having the characteristics of high precision, reversibility and high efficiency. Due to their small friction resistance, ball screws are widely used in various industrial equipment and precision instruments. Since the ball needs to circulate between the reverse raceway and the thread raceway, the ball is moved from the reverse raceway to the thread raceway, or from the thread raceway to the reverse raceway, through the external reverser installed on the ball nut.

[0003] The external deflector is usually fixed with screws to fix the outer end of the external deflector to the ball nut. When the design size of the ball screw is larger, the size of the balls in the ball screw and the external deflector on the ball screw nut also increases accordingly, and the impact force of the balls on the inside of the external deflector also increases. The screws only fix the outer end of the external deflector, so there is a problem of unstable fixation of the inner end of the external deflector when the impact force of the balls is large. Summary of the invention

[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a ball screw nut that uses a pin to assist in fixing an external reverser. The inner end of the external reverser is fixed with the pin to assist in fixing the inner end of the external reverser, so that the inner end of the external reverser is more stable.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a ball screw nut with an external reverser fixed with an auxiliary pin, including a nut body, a pair of mounting grooves for mounting the external reverser are provided on the outer side wall of the nut body, each of the mounting grooves is installed with an external reverser connected to the inside of the nut body, the external reverser includes a first component and a second component spliced ​​together, and also includes a fixing mechanism for fixing the external reverser in the mounting groove, the fixing mechanism includes an external fixing piece for fixing the outer end of the first component and the outer end of the second component and an internal fixing piece for fixing the inner end of the first component and the inner end of the second component. The outer ends of the first component and the second component are fixed by the external fixing piece, and the inner ends of the first component and the second component are fixed by the internal fixing piece. The external fixing piece and the internal fixing piece cooperate with each other to fix the first component and the second component in the mounting groove, and the inner end of the external reverser is fixed with the auxiliary pin, so that the inner end of the external reverser is more stable.

[0006] Preferably, the internal fixing member is a first latch and a second latch installed in the nut body, the first latch is inserted from the end face of the nut body and sequentially penetrates the side wall of the installation groove, the first component and the other side wall of the installation groove, the second latch is inserted from the end face of the nut body and sequentially penetrates the side wall of the installation groove, the second component and the other side wall of the installation groove. The first latch and the second latch are transversely penetrated through the side wall of the nut body and limit the first component and the second component. The method of latch fixing is adopted, which is not only convenient for processing the nut body, but also more convenient for installing the first latch and the second latch.

[0007] Preferably, a first insertion hole for inserting a first pin and a second insertion hole for inserting a second pin are formed on the side wall of the nut body, the first pin is interference fit with the first insertion hole, and the second pin is interference fit with the second insertion hole.

[0008] Preferably, the first insertion hole and the second insertion hole respectively penetrate the end faces of both ends of the nut body, so that it is convenient to use wire cutting if the hole diameter is small, and it is also convenient to remove the first plug and the second plug.

[0009] Preferably, the external reverser is provided with a first inlet and outlet connected to the inside of the nut body and a second inlet and outlet connected to the side wall channel of the nut body, and an arc-shaped channel connecting the first inlet and outlet and the second inlet and outlet is opened in the external reverser, the first component and the second component are separated along the middle of the first inlet and outlet, the second inlet and outlet and the arc-shaped channel, and the holes of the first inlet and outlet, the second inlet and outlet and the arc-shaped channel are divided into two parts, the first component and the second component are separated to form a first fitting surface and a second fitting surface which are arranged obliquely and fitted together, and a positioning component which is positioned and matched with each other is provided between the first fitting surface and the second fitting surface.

[0010] Preferably, the arc-shaped channel includes a first inlet and outlet section connected to the first inlet and outlet, a second inlet and outlet section connected to the second inlet and outlet, and an arc-shaped turning section connecting the first inlet and outlet section and the second inlet and outlet section, and the first inlet and outlet section, the second inlet and outlet section and the arc-shaped turning section are all composed of channel grooves on the first component and the second component.

[0011] Preferably, the first latch is located above the first entry and exit section, and the second latch is located on the side of the arc-shaped turning section.

[0012] Preferably, the positioning assembly includes a first positioning column fixed on the first fitting surface of the first component, a first positioning hole opened on the first fitting surface of the first component, a second positioning column fixed on the second fitting surface of the second component, and a second positioning hole opened on the second fitting surface of the second component, the first positioning column is plugged into and matched with the second positioning hole, and the second positioning column is plugged into and matched with the first positioning hole.

[0013] Preferably, the external fixing member is one of a screw, a pin and a fastener, and the external fixing member passes through the outer end of the first component and the outer end of the second component and is fixed in the installation groove.

[0014] The beneficial effects of the present invention are as follows: the present invention fixes the inner ends of the first component and the second component by the first and second latches, and fixes the outer ends of the first component and the second component by the external fixing member, thereby fixing the first component and the second component; the sides of the first component and the second component are both matched with the side walls of the installation groove and limited by the side walls of the installation groove, and it is only necessary to limit the movement of the first component and the second component in the direction of the notch of the installation groove, so the method of using the latch to transversely penetrate the side walls of the nut body is adopted to limit the first component and the second component in the direction of the notch of the installation groove. The method of fixing with the latch is not only more convenient for processing the nut body, but also more convenient for installing the first latch and the second latch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0016] Figure 2 This is a schematic diagram of the overall structure of the nut body in this embodiment;

[0017] Figure 3 is a cross-sectional view of this embodiment;

[0018] Figure 4 This is a schematic diagram of the structure after the first component and the second component are spliced ​​together in this embodiment;

[0019] Figure 5 is a schematic diagram of the overall structure of the first component in this embodiment;

[0020] Figure 6 Schematic diagram of the overall structure of the second component in this embodiment.

[0021] Explanation of the reference numerals: 1. nut body; 11. mounting groove; 12. outer channel; 13. first plug hole; 14. second plug hole; 2. outer reverser; 21. first component; 211. first fitting surface; 22. second component; 221. second fitting surface; 23. first inlet and outlet; 24. second inlet and outlet; 25. arc-shaped channel; 251. first inlet and outlet section; 252. second inlet and outlet section; 253. arc-shaped turning section; 261. first positioning column; 262. first positioning hole; 263. second positioning column; 264. second positioning hole; 3. outer fixing member; 4. inner fixing member; 41. first latch; 42. second latch. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-6 The present invention will be further described:

[0023] Combination Figure 1 and Figure 2 In this embodiment, the ball screw nut using a pin to assist in fixing the external deflector 2 includes a nut body 1, an external deflector 2 installed on the nut body 1, and a fixing mechanism for fixing the external deflector 2 on the nut body 1. Two mounting grooves 11 for mounting the external deflector 2 are provided on the side wall of the nut body 1. An external deflector 2 is installed in each mounting groove 11. An external channel 12 that passes through the two mounting grooves 11 is provided on the adjacent side walls of the two mounting grooves 11. The ball moves from the nut body 1 to the external channel 12 through one of the external deflectors 2, and then moves to the nut body 1 through the other external deflector 2, thereby realizing the circulation of the ball.

[0024] Combination Figure 1 and Figure 3 The straight line where the axis of the nut body 1 is located is defined as the X-axis, and the outer channel 12 is arranged along the X-axis direction.

[0025] Reference Figure 3 , the Z axis is set as a vertical straight line and passes through the center of the cross section of the nut body 1, and the Y axis is set as a horizontal straight line.

[0026] Combination Figure 1 and Figure 2 The end of the external deflector 2 away from the external channel 12 is called the outer end, and the end of the deflector close to the external channel 12 is called the inner end. Each external deflector 2 includes a first component 21 and a second component 22 that are spliced ​​together. The first component 21 and the second component 22 are both fixed in the mounting groove 11 by a fixing mechanism. The fixing mechanism includes an external fixing member 3 and an internal fixing member 4. The external fixing member 3 is one of a screw, a pin, and a fastener. A hole for cooperating with the external fixing member 3 is opened in the mounting groove 11. The external fixing member 3 passes through the outer end of the first component 21 and the outer end of the second component 22 and fixes the outer end of the first component 21 and the outer end of the second component 22 in the mounting groove 11.

[0027] When the design size of the ball screw is larger, the size of the balls in the ball screw and the external deflector 2 on the ball screw nut also increases accordingly, and the impact force of the balls on the internal channel of the external deflector 2 also increases. When only the external fixing member 3 is used to fix the outer ends of the first component 21 and the second component 22, the inner ends of the first component 21 and the second component 22 will become unstable when subjected to the impact force of the balls. Therefore, the inner ends of the first component 21 and the second component 22 are stabilized by the internal fixing member 4.

[0028] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4The inner fixing member 4 includes a first plug 41 penetrating the inner end of the first component 21 and a second plug 42 penetrating the inner end of the second component 22. The first plug 41 and the second plug 42 are both arranged in the same direction as the outer channel 12 and are arranged on both sides of the outer channel 12. A first insertion hole 13 is formed on the side wall end surface of the nut body 1 corresponding to the first plug 41, and a second insertion hole 14 is formed on the side wall end surface of the nut body 1 corresponding to the second plug 42. The first plug 41 and the first insertion hole 13, and the second plug 42 and the second insertion hole 14 are both interference fit. Due to insufficient design space, the inner ends of the first component 21 and the second component 22 should not be fastened by screws or pins, and both the first component 21 and the second component 22 are in the mounting groove 11 and are limited by the side walls of the mounting groove 11, so it is only necessary to consider the limitation of the inner ends of the first component 21 and the inner ends of the second component 22 in the Z-axis direction. Therefore, a pin fixing method is adopted to limit the inner ends of the first component 21 and the inner ends of the second component 22 in the Z-axis direction. Not only is it easier to open the first socket 13 and the second socket 14, but the installation of the first pin 41 and the second pin 42 is also more convenient, and at the same time, it can also meet the limitation requirements of the inner ends of the first component 21 and the inner ends of the second component 22.

[0029] The first latch 41 and the second latch 42 pass through the two mounting grooves 11, so that the first latch 41 passes through the first component 21 in one mounting groove 11 and the second component 22 in the other mounting groove 11, and the second latch 42 passes through the second component 22 in one mounting groove 11 and the first component 21 in the other mounting groove 11.

[0030] Combination Figure 2 and Figure 4 When the cross-sectional diameters of the first plug pin 41 and the second plug pin 42 are relatively large, the first plug hole 13 and the second plug hole 14 can be directly drilled on one end face of the side wall of the nut body 1 without penetrating the other end face of the nut body 1. When the cross-sectional diameters of the first plug pin 41 and the second plug pin 42 are relatively small, the first plug hole 13 and the second plug hole 14 can be processed by wire cutting, so that the first plug hole 13 and the second plug hole 14 are provided on both end faces of the side wall of the nut body 1, and a channel for installing the first plug pin 41 and penetrating the side wall of the nut body 1 is formed between the first plug holes 13 at both ends, and a channel for installing the second plug pin 42 and penetrating the side wall of the nut body 1 is formed between the second plug holes 14 at both ends.

[0031] Combination Figure 3 , Figure 4 and Figure 5In order to facilitate the opening of the internal arc-shaped channel 25, the external reverser 2 usually needs to be divided into two parts along the plane where the axis of the internal arc-shaped channel 25 is located as a cutting surface, forming a first component 21 and a second component 22 that are spliced ​​together. The surface formed on the first component 21 due to cutting is the first fitting surface 211, and the surface formed on the second component 22 due to cutting is the second fitting surface 221. When the first component 21 and the second component 22 are spliced ​​together, the first fitting surface 211 and the second fitting surface 221 are tightly matched.

[0032] The two ends of the arc-shaped channel 25 of the outer deflector 2 are connected to the outside of the outer deflector 2 to form a first inlet and outlet 23 and a second inlet and outlet 24. The first inlet and outlet 23 is connected to the inside of the nut body 1, and the second inlet and outlet 24 is connected to the outer channel 12. In order to allow the ball to smoothly enter the outer deflector 2, the first inlet and outlet 23 is usually set in the tangent direction of the normal running trajectory of the ball, so from the cross section of the nut body 1, the outer deflector 2 is obliquely cut into the first part 21 and the second part 22.

[0033] Since the first latch 41 penetrates both the first component 21 of one of the outer reversers 2 and the second component 22 of the other outer reverser 2, in order to better describe the positional relationship between the inner fixing member 4 and the outer reverser 2, Figure 3 Described for reference.

[0034] Combination Figure 3 , Figure 5 and Figure 6 The arc channel 25 includes a first inlet and outlet section 251 connected to the first inlet and outlet 23, a second inlet and outlet section 252 connected to the second inlet and outlet 24, and an arc turning section 253 connecting the first inlet and outlet section 251 and the second inlet and outlet section 252. Since the arc channel 25 is divided into two, when the ball enters and exits the arc channel 25, the directions of the impact force on the first component 21 and the second component 22 are also different, so the positions of the first latch 41 and the second latch 42 are also different.

[0035] Combination Figure 3 and Figure 4 ,and Figure 5 When the ball enters from the first inlet and outlet 23 and passes through the first inlet and outlet section 251 and the arc-shaped turning section 253 in sequence, during the turning process of the ball, under the action of inertia, the ball applies a force to the side wall of the arc-shaped turning section 253. Since the upper half of the arc-shaped turning section 253 is the first component 21, the force applied by the ball to the first component 21 is mainly in the Z-axis direction, so that the inner end of the first component 21 has a tendency to move along the Z-axis in a direction away from the nut body 1, so the first pin 41 is arranged above the first inlet and outlet section 251 of the first component 21.

[0036] Combination Figure 3 , Figure 4 and Figure 6 Since the lower half of the arc-shaped turning section 253 is the second component 22, the force applied by the ball to the second component 22 is mainly in the Y-axis direction, so that the inner end of the second component 22 has a tendency to move along the Y-axis in a direction away from the arc-shaped turning section 253, so the second latch 42 is arranged on the side of the arc-shaped turning section 253 of the second component 22.

[0037] Since the first component 21 and the second component 22 in the two mounting grooves 11 are centrally symmetrical, the first pin 41 and the second pin 42 are both penetrated by the first component 21 and the second component 22, that is, the first pin 41 and the second pin 42 both need to meet the limiting requirements of the first component 21 and the second component 22 at the same time. Therefore, when the first pin 41 and the second pin 42 meet the limiting requirements of the first component 21 and the second component 22 of one of the external inverters 2, they are symmetrically distributed with the plane where the X-axis and the Z-axis are located as the symmetry plane, so that the first pin 41 and the second pin 42 meet the limiting requirements of the first component 21 and the second component 22 of the other external inverter 2.

[0038] Combination Figure 5 and Figure 6 In order to position the first fitting surface 211 and the second fitting surface 221, a mutually positioned positioning component is provided between the first fitting surface 211 and the second fitting surface 221. The positioning component includes a first positioning column 261 fixed on the first fitting surface 211 of the first component 21, a first positioning hole 262 provided on the first fitting surface 211 of the first component 21, a second positioning column 263 fixed on the second fitting surface 221 of the second component 22, and a second positioning hole 264 provided on the second fitting surface 221 of the second component 22. The first positioning column 261 is plugged into the second positioning hole 264, and the second positioning column 263 is plugged into the first positioning hole 262. By means of the mutual plugging and positioning of the positioning column and the positioning hole, the first fitting surface 211 and the second fitting surface 221 are positioned and calibrated, and the relative sliding of the first fitting surface 211 and the second fitting surface 221 can be reduced when the external inverter 2 is working.

[0039] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A ball screw nut with an external deflector fixed with a pin, comprising a nut body (1), a pair of mounting grooves (11) for mounting an external deflector (2) are provided on an outer wall of the nut body (1), each of the mounting grooves (11) is provided with an external deflector (2) connected to the inside of the nut body (1), the external deflector (2) comprising a first component (21) and a second component (22) which are spliced ​​together, characterized in that: It also includes a fixing mechanism for fixing the external deflector (2) in the mounting groove (11), the fixing mechanism including an external fixing member (3) for fixing the outer end of the first component (21) and the outer end of the second component (22), and an internal fixing member (4) for fixing the inner end of the first component (21) and the inner end of the second component (22); The inner fixing member (4) is a first latch (41) and a second latch (42) installed in the nut body (1); the first latch (41) penetrates from the end face of the nut body (1) and sequentially penetrates the side wall of the mounting groove (11), the first component (21) and the other side wall of the mounting groove (11); the second latch (42) penetrates from the end face of the nut body (1) and sequentially penetrates the side wall of the mounting groove (11), the second component (22) and the other side wall of the mounting groove (11).

2. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 1, characterized in that: A first insertion hole (13) for inserting a first plug pin (41) and a second insertion hole (14) for inserting a second plug pin (42) are provided on the side wall of the nut body (1); the first plug pin (41) is interference fit with the first insertion hole (13), and the second plug pin (42) is interference fit with the second insertion hole (14).

3. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 2, characterized in that: The first insertion hole (13) and the second insertion hole (14) respectively penetrate the end surfaces of both ends of the nut body (1).

4. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 1, characterized in that: The outer deflector (2) is provided with a first inlet and outlet (23) communicating with the interior of the nut body (1) and a second inlet and outlet (24) communicating with the side wall channel of the nut body (1); an arcuate channel (25) communicating with the first inlet and outlet (23) and the second inlet and outlet (24) is provided inside the outer deflector (2); the first component (21) and the second component (22) are separated along the middle of the first inlet and outlet (23), the second inlet and outlet (24) and the arcuate channel (25), so that the holes of the first inlet and outlet (23), the second inlet and outlet (24) and the arcuate channel (25) are divided into two parts; the first component (21) and the second component (22) are separated to form a first fitting surface (211) and a second fitting surface (221) which are arranged to be inclined and fitted together; a positioning component which is mutually positioned and matched is provided between the first fitting surface (211) and the second fitting surface (221).

5. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 4, characterized in that: The arcuate channel (25) comprises a first inlet and outlet section (251) communicating with the first inlet and outlet (23), a second inlet and outlet section (252) communicating with the second inlet and outlet (24), and an arcuate turning section (253) connecting the first inlet and outlet section (251) and the second inlet and outlet section (252); the first inlet and outlet section (251), the second inlet and outlet section (252), and the arcuate turning section (253) are all formed by combining channel grooves on the first component (21) and the second component (22).

6. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 5, characterized in that: The first latch pin (41) is located above the first entry and exit section (251), and the second latch pin (42) is located on the side of the arc-shaped turning section (253).

7. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 4, characterized in that: The positioning component comprises a first positioning column (261) fixed on a first fitting surface (211) of the first component (21), a first positioning hole (262) opened on the first fitting surface (211) of the first component (21), a second positioning column (263) fixed on a second fitting surface (221) of the second component (22), and a second positioning hole (264) opened on the second fitting surface (221) of the second component (22), the first positioning column (261) and the second positioning hole (264) being plug-fitted together, and the second positioning column (263) and the first positioning hole (262) being plug-fitted together.

8. The ball screw nut with an external deflector secured with a pin as an auxiliary means according to claim 1, characterized in that: The external fixing member (3) is one of a screw, a pin and a fastener. The external fixing member (3) passes through the outer end of the first component (21) and the outer end of the second component (22) and is fixed in the installation groove (11).

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