CN218845017U - Nut stop structure for ball screw - Google Patents

Abstract

The utility model discloses a nut stopper structure for a ball screw. The nut stop structure includes: a screw shaft and a stop ring; the screw shaft has a threaded part, a terminal part, a first knurled part and an annular groove, and the first knurled part is connected to the threaded part and the terminal Between the parts, an annular groove is provided on the outer peripheral surface of the first knurled part; the stop ring has a first end face facing the threaded part, a second end face facing the end part, a penetrating first end face and a second end face The sleeve hole, an annular protrusion protruding outward from the second end surface, and a second knurled portion arranged on the hole wall of the sleeve hole, on the one hand, the stop ring uses the second knurled portion and the screw shaft On the other hand, the annular protrusion is positioned in the annular groove of the screw shaft in a riveting manner. Therefore, the nut stopper structure of the present invention can quickly complete the assembly, so as to realize the goal of automatic assembly.

Description

Nut stop structure for ball screw

technical field

The utility model relates to a ball screw, in particular to a nut stopper structure for a ball screw.

Background technique

As far as the automotive ball screw currently used in the brake system is concerned, a stop ring is installed at the end of the screw shaft to withstand the impact of the nut through the stop ring to prevent the nut from over-traveling. The traditional stop ring is inserted into the screw shaft in a tight fit. In addition to requiring more assembly man-hours, additional alignment features (such as tangent planes corresponding to each other) need to be set between the stop ring and the screw shaft. Not only in The processing is more troublesome, and it also leads to low assembly efficiency, so it is not suitable for automated production.

The screw mechanism part disclosed by CN 113795690 A presses the mechanical part (i.e. the stop ring) on the knurled part of the lead screw, so that the pressing section produces plastic deformation and is pushed along the direction of the circumferential groove. The debris generated in the process will be forced into the circumferential groove under the relative displacement between the mechanical parts and the lead screw. It is only used to collect debris generated during the assembly of mechanical parts. Therefore, the aforementioned patents also have the problems of time-consuming assembly, low production efficiency and difficulty in automation.

Utility model content

(1) Technical problems to be solved

The main purpose of the utility model is to provide a nut stopper structure for a ball screw, which can quickly complete the assembly, so as to realize the goal of automatic assembly.

(2) Technical solution

In order to achieve the above main purpose, the nut stop structure of the present invention includes a screw shaft and a stop ring. The screw shaft has a threaded part, a terminal part, a first knurled part and an annular groove, and the two ends of the first knurled part are respectively connected with one end of the threaded part and one end of the terminal part, and the ring A shaped groove is provided on the outer peripheral surface of the first knurled portion; the stop ring has a first end surface, a second end surface, a set of holes, an annular convex portion and a second knurled portion, the first end surface One end face faces the threaded portion of the screw shaft, the second end face faces the end portion of the screw shaft, the sleeve hole runs through the first end face and the second end face, the second knurled portion is arranged on the sleeve The hole wall of the hole, the annular protrusion protrudes from the second end surface along the axial direction of the sleeved hole.

As can be seen from the above, the nut stop structure of the present utility model uses the sleeve hole to sleeve the stop ring from the end portion of the screw shaft on the first knurled portion of the screw shaft during assembly, so that the stop ring The second knurled portion of the stop ring cooperates with the first knurled portion of the screw shaft, and then forces the annular protrusion of the stop ring to deform to be positioned in the annular groove of the screw shaft , so that the assembly of the two can be quickly completed to improve the assembly efficiency, thereby achieving the goal of automated assembly.

Preferably, the distance from the center of the annular groove to the junction of the first knurled portion and the end portion is 15%-30% of the total length of the first knurled portion. In this way, the stop ring has sufficient structural strength to withstand the impact of a nut after assembly.

Preferably, the first knurled portion has a chamfered area adjacent to the end portion of the screw shaft. Through the chamfering area, the second knurled portion is less likely to interfere with the first knurled portion during assembly.

Preferably, the chamfer size of the chamfer area is between C0.3-C0.7.

Preferably, the second knurled portion extends from the hole wall of the sleeve hole to an inner wall surface of the annular protrusion along the axial direction of the sleeve hole. In this way, the processing of the second knurled portion can be completed at one time, so as to improve the processing convenience.

Preferably, the outer ring surface of the annular protrusion protrudes horizontally from the second end surface along the axial direction of the sleeve hole. In this way, the annular protrusion can be deformed and positioned in the annular groove by applying a radial external force to the annular protrusion.

Preferably, the outer ring surface of the annular protrusion protrudes from the second end surface in a tapered manner along the axial direction of the sleeve hole. In this way, the annular protrusion can be deformed and positioned in the annular groove by applying an axial external force to the annular protrusion.

Preferably, the second knurled portion of the stop ring is loosely fitted on the first knurled portion of the screw shaft. In this way, it is beneficial to use an automatic assembly method to set the stop ring on the screw shaft.

Preferably, the stop ring further has a stop portion, and the stop ring uses the stop portion to limit a nut running on the threaded portion of the screw shaft.

Preferably, the stop portion protrudes from an outer ring surface of the stop ring along a radial direction of the stop ring and extends from the first end surface along the axial direction of the sleeve hole to On the second end surface, the nut has a slot for accommodating the stop ring and a limiting portion protruding from the wall of the slot and abutting against the stop portion.

The detailed structure, characteristics, assembly or usage of the nut stopper structure used in the ball screw provided by the present invention will be described in the following detailed description of the implementation. However, those of ordinary skill in the field of the utility model should be able to understand that these detailed descriptions and the specific embodiments listed for implementing the utility model are only used to illustrate the utility model, and are not intended to limit the patent application of the utility model scope.

Description of drawings

Fig. 1 is a perspective view of the nut stop structure of the first embodiment of the present invention used in conjunction with the nut, mainly showing the state when the nut is limited by the stop ring;

Fig. 2 is a three-dimensional exploded view of the nut stopper structure of the first embodiment of the present invention;

Fig. 3 is an axial cross-sectional view of the nut stop structure of the first embodiment of the present invention, mainly showing that the annular protrusion has not been positioned in the annular groove;

Fig. 4 is similar to Fig. 3, mainly showing that the annular protrusion is positioned in the annular groove;

Fig. 5 is an enlarged view of part A in Fig. 4;

Fig. 6 is a perspective view of the nut stopper structure of the second embodiment of the present invention;

Fig. 7 is a three-dimensional exploded view of the nut stopper structure of the second embodiment of the present invention;

Fig. 8 is an axial cross-sectional view of the nut stopper structure of the second embodiment of the present invention, mainly showing that the annular protrusion has not been positioned in the annular groove;

Fig. 9 is similar to Fig. 8, mainly showing that the annular protrusion is positioned in the annular groove;

Fig. 10 is an enlarged view of part A in Fig. 9;

【Main components】

10: The first nut stop structure

10': The second nut stop structure

20: screw shaft

21: threaded part

22: end part

23: The first knurling part

L: The total length of the first knurled part

24: Annular groove

D: distance

25: chamfering area

30: stop ring

31: first end face

32: Second end face

33: Set hole

34: Annular convex part

342: outer ring surface

35: The second knurling part

36: stop part

40: stop ring

41: The third end face

42: The fourth end face

43: Set hole

44: Annular convex part

442: outer ring

45: The second knurling part

50: Nut

51: slotting

52: limit part

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

First of all, it is hereby explained that in the entire specification, including the embodiments described below and the claims of the scope of application, the nouns related to direction are all based on the directions in the drawings. Secondly, in the embodiments to be described below and in the drawings, the same element numbers represent the same or similar elements or their structural features.

Referring to FIG. 1 and FIG. 2 , the first nut stop structure 10 of the first embodiment of the present invention includes a screw shaft 20 and a stop ring 30 .

The screw shaft 20 has a threaded portion 21 , a terminal portion 22 , a first knurl portion 23 and an annular groove 24 . The threaded portion 21 is used for a nut 50 to run, please refer to FIG. 2 , one end surface of the nut 50 has a slot 51 and a limiting portion 52 protruding radially from the wall of the slot 51 ; A knurled portion 23 is located between the threaded portion 21 and the end portion 22 and connects one end of the threaded portion 21 and one end of the end portion 22 with its two ends respectively, the first knurled portion 23 has a chamfer adjacent to the end portion 22 Zone 25 (as shown in Figure 5), the chamfering size of the chamfering zone 25 is between C0.3-C0.7 in this embodiment; the annular groove 24 is arranged on the outer peripheral surface of the first knurled part 23 , and the distance D from the center of the annular groove 24 to the junction of the first knurled portion 23 and the end portion 22 is 15%-30% of the total length L of the first knurled portion 23 .

The stop ring 30 has a first end surface 31 , a second end surface 32 , a set of holes 33 , an annular protrusion 34 and a second knurled portion 35 . The sleeve hole 33 runs through the first end surface 31 and the second end surface 32; the annular protrusion 34 protrudes from the second end surface 32 along the axial direction of the sleeve hole 33. In this embodiment, the annular protrusion 34 The outer ring surface 342 extends horizontally from the second end surface 32 along the axial direction of the sleeve hole 33; the second knurled portion 35 is provided on the wall of the sleeve hole 33 in this embodiment, further Extend from the hole wall of the sleeve hole 33 to the inner wall surface of the annular convex portion 34 along the axial direction of the sleeve hole 33, so that the processing of the second knurled portion 35 can be completed at one time to improve the processing convenience. However, in practice, The second knurled portion 35 only needs to be provided on the hole wall of the sheathing hole 33 , and does not have to extend to the inner wall surface of the annular convex portion 34 . In addition, as shown in FIG. 1 and FIG. 2 , the stop ring 30 further has a stop portion 36 protruding from the outer ring surface of the stop ring 36 along the radial direction of the casing hole 33 and Extending from the first end surface 31 to the second end surface 32 along the axial direction of the sleeve hole 33 , when the nut 50 moves to the limit portion 52 and is blocked by the stop portion 36 of the stop ring 30 , the nut 50 reaches end of journey.

During assembly, as shown in FIGS. 3 to 5 , the stop ring 30 is first sleeved on the first knurled portion 23 of the screw shaft 20 from the end portion 22 of the screw shaft 20 through the sleeve hole 33 until the stop ring 30 The first end surface 31 of the stop ring 30 abuts against the threaded portion 21 of the screw shaft 20. At this time, the second end surface 32 of the stop ring 30 will face the end portion 22 of the screw shaft 20, and the second knurled portion 35 of the stop ring 30 Loosely fitted on the first knurled portion 23 of the screw shaft 20, and then apply a radial external force to the annular protrusion 34 of the stop ring 30 to make it plastically deformed and positioned in the annular groove 24 of the screw shaft 20, so That is, the assembly of the two is completed. During the assembly process of the two, on the one hand, the setting of the chamfered area 25 can reduce the occurrence of mutual interference between the second knurled portion 35 of the stop ring 30 and the first knurled portion 23 of the screw shaft 20 , to facilitate assembly, on the other hand, through the design of the position of the annular groove 24, that is, the distance D from the center of the annular groove 24 to the junction of the first knurled portion 23 and the end portion 22 is the first 15%-30% of the total length L of the knurled portion 23 enables the stop ring 30 to have sufficient structural strength to withstand the impact of the nut 50 after assembly.

Please refer to Fig. 6 and Fig. 7, the structure of the second nut stop structure 10' of the second embodiment of the present invention is substantially the same as that of the above-mentioned first embodiment, the main difference is that the structure of the stop ring 40 is different. In this embodiment, the outer ring surface 442 of the annular protrusion 44 of the stop ring 40 protrudes gradually from the fourth end surface 42 along the axial direction of the sleeve hole 43 , so that the annular protrusion 44 faces toward The direction away from the fourth end surface 42 extends in a tapered shape. In this way, when the stop ring 40 is assembled, as shown in FIG. 8 to FIG. Until the third end surface 41 of the stop ring 40 abuts against the threaded portion 21 of the screw shaft 20 , the fourth end surface 42 of the stop ring 40 at this time faces the end portion 22 of the screw shaft 20 , and the second end surface 42 of the stop ring 40 The knurled portion 45 is loosely fitted on the first knurled portion 23 of the screw shaft 20 , and then an axial external force is applied to the annular protrusion 44 of the stop ring 40 to cause plastic deformation to be positioned in the annular groove of the screw shaft 20 Within 24, the assembly of the two is completed in this way.

In summary, the nut stop structure 10, 10' of the present utility model positions the annular protrusions 34, 44 of the stop rings 30, 40 in the annular groove 24 of the screw shaft 20 by riveting, The assembly of the stop rings 30 and 40 can be quickly completed to improve the assembly efficiency, thereby achieving the goal of automatic assembly.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above descriptions are only specific embodiments of the utility model and are not intended to limit the utility model. For new models, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (10)

1. A nut stopper structure for a ball screw, characterized by comprising:

the screw shaft is provided with a thread part, a tail end part, a first knurled part and an annular groove, two ends of the first knurled part are respectively connected with one end of the thread part and one end of the tail end part, and the annular groove is arranged on the outer peripheral surface of the first knurled part;

the stop ring is provided with a first end face, a second end face, a sleeving hole, an annular convex part and a second knurled part, the first end face faces the threaded part of the screw shaft, the second end face faces the tail end part of the screw shaft, the sleeving hole penetrates through the first end face and the second end face, the second knurled part is arranged on a hole wall of the sleeving hole and matched with the first knurled part of the screw shaft, and the annular convex part protrudes out from the second end face along the axial direction of the sleeving hole and is positioned in the annular groove of the screw shaft.

2. The nut stopper structure for a ball screw according to claim 1, wherein a distance from a center of the annular groove to a boundary of the first knurled portion and the distal end portion is 15% to 30% of an overall length of the first knurled portion.

3. The nut stop structure for a ball screw of claim 1, wherein the first knurled section has a chamfered section that abuts the distal end portion of the screw shaft.

4. The nut stop structure for a ball screw according to claim 3, wherein the chamfer dimension of the chamfer area is between C0.3-C0.7.

5. The nut stopper structure according to claim 1, wherein the second knurled portion extends from the hole wall of the housing hole to an inner wall surface of the annular projection in the axial direction of the housing hole.

6. The nut stopper structure for a ball screw according to claim 1, wherein an outer circumferential surface of the annular protrusion protrudes horizontally from the second end surface along the axial direction of the fitting hole.

7. The nut stopper structure for a ball screw according to claim 1, wherein an outer circumferential surface of the annular protrusion is protruded from the second end surface in a tapered manner along the axial direction of the receiving hole.

8. The nut stop structure for a ball screw according to claim 1, wherein the second knurled portion of the stop ring is loosely fitted over the first knurled portion of the screw shaft.

9. The nut stop structure for a ball screw according to claim 1, wherein the stop ring further has a stopper portion for restraining a nut running on the threaded portion of the screw shaft.

10. The nut stopper structure according to claim 9, wherein the stopper portion protrudes from an outer circumferential surface of the stopper ring in a radial direction of the fitting hole and extends from the first end surface to the second end surface in the axial direction of the fitting hole.

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