A continuous oil storage thread structure and screw transmission part that is easy to demould

Abstract

The present invention discloses a continuous oil storage thread structure that is easy to demould, comprising a screw, the screw comprising a rod body and at least one thread spirally wound on the outer surface of the rod body and extending from the first end of the rod body to the second end of the rod body, the thread having a first thread side surface and a second thread side surface, the first thread side surface and the second thread side surface being two opposite sides in the axial direction of the thread; it also comprises: a first receiving groove arranged on the first thread side surface and / or a second receiving groove arranged on the second thread side surface; the first receiving groove and / or the second receiving groove are at least used to store lubricating grease. The present invention avoids the mutually inverted demoulding features on the original thread by arranging the receiving groove on the thread side surface, and at the same time has the functions of storing oil and accommodating foreign matter, so that the screw can be produced by injection molding / die casting process using a semi-demolding method, thereby reducing production costs.

Description

Technical Field

[0001] The invention relates to the field of transmission screws, and in particular to a continuous oil storage thread structure and a lead screw transmission part which are easy to demould. Background Art

[0002] The screw-nut drive is the most common structural form that converts rotary motion into linear motion. It has the characteristics of fast speed, smooth operation and large output force. In order to improve the operating efficiency, grease is usually sprayed on the thread. At present, the common screw structures are: metal continuous thread screw, plastic continuous thread screw and plastic discontinuous thread screw.

[0003] Although metal continuous thread screws have the advantages of high thread continuity stability, high strength and high overlap, their production cycle is long due to the limitations of the rolling process. At the same time, it is difficult to set oil storage features on the threads. At the same time, foreign matter in the continuous transmission of metal continuous thread screws can easily cause the screw nut to get stuck.

[0004] Compared with metal continuous thread screws, plastic continuous thread screws have the characteristics of short processing cycle in injection molding process. However, due to the thread design of traditional plastic continuous thread screws (reference Figure 1 ), there is an upper external buckle feature 205 on the upper side of the first side 200 of the thread located on the upper side of the rod axis 103, and similarly there is a lower external buckle feature 255 on the lower side of the second side 250 of the thread located on the lower side of the rod axis 103. The upper external buckle feature 205 and the lower external buckle feature 255 are mutually inverted in the lateral direction of the rod axis 103, which makes the plastic continuous thread screw only adopt the rotary demoulding process. On the one hand, the high mold precision requirement of the rotary demoulding process leads to an increase in production costs; on the other hand, the rotary demoulding process makes the plastic thread unable to realize the function of thread oil storage. At the same time, the plastic continuous thread screw also has the problem that foreign matter can easily cause the screw nut to get stuck during continuous transmission of the continuous thread.

[0005] See also Figure 2 and Figure 3 For the above two thread structures, the plastic discontinuous thread screw solves the problems of oil storage feature layout and production cost reduction. However, due to its discontinuous thread structure, the meshing surface with the workpiece is reduced, the adaptability strength is reduced, and it is difficult to control the quality of the thread during the production process due to the discontinuous thread. Summary of the invention

[0006] One of the technical problems to be solved by the present invention is to provide a continuous oil storage thread structure that is easy to demould in order to solve the problem that the above-mentioned metal continuous thread screw and plastic continuous thread screw have no oil storage feature.

[0007] The second technical problem to be solved by the present invention is to provide a screw transmission component having the above-mentioned continuous oil storage thread structure that is easy to demould.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A continuous oil storage thread structure that is easy to demould comprises a screw rod, wherein the screw rod comprises a rod body and at least one thread that is spirally wound on the outer surface of the rod body and extends from the first end of the rod body to the second end of the rod body, wherein the thread has a first thread side surface and a second thread side surface, wherein the first thread side surface and the second thread side surface are two opposite side surfaces in the axial direction of the thread; and further comprises:

[0010] The first receiving groove provided on the first side surface of the thread and / or the second receiving groove provided on the second side surface of the thread. In a preferred embodiment of the present invention, the first receiving groove and / or the second receiving groove are also used to receive foreign matter or store lubricating grease.

[0011] In a preferred embodiment of the present invention, the first accommodating groove and / or the second accommodating groove are used to avoid the undercut feature on the first side surface of the screw and / or the undercut feature on the second side surface of the screw.

[0012] In a preferred embodiment of the present invention, the first side surface of the thread is composed of a first section of the first side surface of the thread, a second section of the first side surface of the thread, and a third section of the first side surface of the thread, which are connected in sequence and cycle;

[0013] The second side surface of the thread is composed of the first section of the second side surface of the thread, the second section of the second side surface of the thread and the third section of the second side surface of the thread;

[0014] The first accommodating groove is surrounded by the second section of the first side surface of the thread and the third section of the first side surface of the thread;

[0015] The second accommodating groove is surrounded by the second section of the second side surface of the thread and the third section of the second side surface of the thread.

[0016] In a preferred embodiment of the present invention, the first accommodating groove, the second section of the first side surface of the thread and the third section of the first side surface of the thread are symmetrical with the second accommodating groove, the second section of the second side surface of the thread and the third section of the second side surface of the thread about the axis of the rod body at 180° rotation.

[0017] In a preferred embodiment of the present invention, the contour surface of the second section of the first side surface of the thread is perpendicular to the axis of the rod body.

[0018] In a preferred embodiment of the present invention, the second section of the first side surface of the thread is a spatial curved surface that gradually engages with the rod body.

[0019] In a preferred embodiment of the present invention, the first section of the first side surface of the thread and the second section of the first side surface of the thread are connected by a first transition end of the first side surface of the thread; the first section of the second side surface of the thread and the second section of the second side surface of the thread are connected by a first transition end of the second side surface of the thread.

[0020] In a preferred embodiment of the present invention, the first transition end of the first side surface of the thread and the first transition end of the second side surface of the thread are both rounded or chamfered.

[0021] In a preferred embodiment of the present invention, the screw is made of plastic or metal.

[0022] In a preferred embodiment of the present invention, the number of threads is an even number.

[0023] In a preferred embodiment of the present invention, the number of threads is two or four.

[0024] In a preferred embodiment of the present invention, when there are two threads, the two threads extend alternately at 180°.

[0025] In a preferred embodiment of the present invention, when there are four threads, the four threads extend alternately at 90°.

[0026] The screw transmission part of the present invention has the above-mentioned continuous oil storage thread structure which is easy to demould. The beneficial effects of the present invention are:

[0027] The present invention provides a continuous oil storage thread structure and a screw transmission component that are easy to demold. By arranging a receiving groove on the side of the thread, the demolding features of the original thread that are inverted with each other are avoided. At the same time, it can also have the functions of storing oil and accommodating foreign matter, so that the screw can be produced by injection molding / die casting process using a semi-demolding method, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0029] Figure 1 It is a schematic diagram of an existing plastic continuous thread screw.

[0030] Figure 2 It is a schematic diagram of an existing plastic discontinuous thread lead screw.

[0031] Figure 3 for Figure 2 An enlarged schematic diagram of point I.

[0032] Figure 4It is an overall schematic diagram of the continuous oil storage thread structure of Example 1 of the present invention (two threads).

[0033] Figure 5 It is a partial enlarged view of the thread of embodiment 1 of the present invention (two threads).

[0034] Figure 6 The present invention Figure 5 AA section view (two threads).

[0035] Figure 7 The present invention Figure 6 Axial top view (two threads).

[0036] Figure 8 The present invention Figure 6 Axial bottom view (two threads).

[0037] Fig. 9 Schematic diagram of the screw transmission member of the present invention (two threads).

[0038] Fig.10 and Fig.11 It is an overall schematic diagram of the continuous oil storage thread structure of Example 2 of the present invention (four threads).

[0039] Fig.12 It is a partial enlarged view of the threads of Example 2 of the present invention (four threads).

[0040] Fig.13 and Fig.14 It is an axial side view of a threaded portion of Example 2 of the present invention (four threads). DETAILED DESCRIPTION

[0041] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0042] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Example 1

[0044] refer to Figure 4 The invention discloses a continuous oil storage thread structure which is easy to demould, and mainly comprises a rod body 100 on a screw rod 10 and two threads 20 arranged on the rod body 100.

[0045] The rod body 100 can be made of a variety of materials such as plastic or metal. In this embodiment, plastic is preferred and can be made by injection molding or other processes. If metal material is used, it can be made by die casting or other machining or cold processing or hot processing processes.

[0046] The two threads 20 extend 180° from the first end 101 of the rod body 100 to the second end 102 of the rod body 100. The axial length of the threads 20 can be less than or equal to the axial length of the rod 100 according to actual implementation requirements, which means that a non-threaded surface is allowed on the rod 100.

[0047] refer to Figure 5 In order to enable the screw 10 to be produced by half demolding (the direction of the arrow away from the axis in the figure), each thread 20 has a first thread side surface 200 and a second thread side surface 250 on both sides. The first thread side surface 200 is sequentially arranged with a first thread side first section 201, a second thread side first section 202 and a third thread side first section 203.

[0048] The entire first side surface 200 of the thread is composed of a plurality of groups of continuous first side first section 201, second side second section 202, and third side third section 203 of the thread, which are connected in a loop. The second side second section 202 of the thread is located on the upper side of the rod body axis 103, and the second side second section 202 of the thread can be vertical to the rod body axis 103 in space, or can be a curved surface gradually connected to the rod body 100; the third side third section 203 of the thread is a semi-mold stripping guide profile.

[0049] The area range of the second section 202 of the first side of the thread and the third section 203 of the first side of the thread covers the upper side outer buckle feature 205 in the prior art (see Figure 1 ), a first receiving groove 206 in the shape of a groove is formed on the outer side of the second section 202 of the first side of the thread and the third section 203 of the first side of the thread, for receiving foreign matter or storing lubricating grease. When there is foreign matter (such as metal debris) between the threads 20, the foreign matter will be pushed into the first receiving groove 206 by the working mechanism to prevent jamming and damage to the screw 10. In order to further increase the life of the mold, the first transition end 204 of the first side of the thread located between the first section 201 of the first side of the thread and the second section 202 of the first side of the thread is rounded or chamfered.

[0050] Combined with reference Figures 6 to 8 The second side surface 250 of the thread is similarly arranged with a first section 251 of the second side of the thread, a second section 252 of the second side of the thread, a third section 253 of the second side of the thread, a first transition end 254 of the second side of the thread, and a second accommodating groove 256.

[0051] Similarly, the entire second side surface 250 of the thread is also composed of multiple groups of continuous, sequential first segments 251 of the second side of the thread, second segments 252 of the second side of the thread, and third segments 253 of the second side of the thread. The features on the second side surface 250 of the thread are symmetrical with the first side surface 200 of the thread in terms of position and structure, which are rotated 180° with the axis 103 of the rod body. Specifically, the second segment 252 of the second side of the thread is symmetrical with the second segment 202 of the first side of the thread in terms of rotation 180° with the axis 103 of the rod body, the first segment 251 of the second side of the thread is symmetrical with the first segment 201 of the first side of the thread in terms of rotation 180° with the axis 103 of the rod body, the third segment 253 of the second side of the thread is symmetrical with the third segment 203 of the first side of the thread in terms of rotation 180° with the axis 103 of the rod body, and the second receiving groove 256 is symmetrical with the first receiving groove 206 in terms of rotation 180° with the axis 103 of the rod body. Similarly, the area range of the second section 252 of the second side of the thread and the third section 253 of the second side of the thread also covers the lower side outer buckle feature 255 ( Figure 1 ). Thus, the screw 10 can be demoulded in half after the injection molding process, thereby improving production efficiency.

[0052] refer to Fig. 9 In one embodiment of the present invention, the screw 10 is axially connected to a gear 30 and then rotatably assembled with a nut 40 to form a screw transmission member.

[0053] Example 2

[0054] See also Figures 10 to 14 The difference of the easy-to-release continuous oil storage thread structure of this embodiment is that the number of threads 20 is four, and the four threads 20 extend from the first end 101 of the rod body 100 to the second end 102 of the rod body 100 at 90 degrees and are evenly distributed on the circumference of the rod body 100 with the rod body axis 103. The rest of the structure is the same as that of embodiment 1.

Claims

1. A continuous oil storage thread structure that is easy to demould, comprising a screw, the screw comprising a rod body and at least one thread spirally wound on the outer surface of the rod body and extending from the first end of the rod body to the second end of the rod body, the thread having a first thread side surface and a second thread side surface, the first thread side surface and the second thread side surface being two opposite side surfaces in the axial direction of the thread; characterized in that: Also includes: A first receiving groove disposed on the first side of the thread and / or a second receiving groove disposed on the second side of the thread; The first side surface of the thread is composed of a first section of the first side surface of the thread, a second section of the first side surface of the thread, and a third section of the first side surface of the thread, which are connected in sequence and in a cycle, and the first receiving groove is surrounded by the second section of the first side surface of the thread and the third section of the first side surface of the thread; The second side surface of the thread is composed of the first section of the second side surface of the thread, the second section of the second side surface of the thread and the third section of the second side surface of the thread, and the second accommodating groove is surrounded by the second section of the second side surface of the thread and the third section of the second side surface of the thread.

2. The easy-to-demold continuous oil storage thread structure according to claim 1, characterized in that: The first receiving groove and / or the second receiving groove are also used to receive foreign matter or to store lubricating grease.

3. An easy-to-demold continuous oil storage thread structure as claimed in claim 1 or 2, characterized in that: The first accommodating groove and / or the second accommodating groove are used to avoid the undercut feature on the first side surface of the screw and / or the undercut feature on the second side surface of the screw.

4. The easy-to-demold continuous oil storage thread structure according to claim 3, characterized in that: The first accommodating groove, the second section of the first side surface of the thread and the third section of the first side surface of the thread are symmetrical with the second accommodating groove, the second section of the second side surface of the thread and the third section of the second side surface of the thread about the axis of the rod body by 180° rotation.

5. The easy-to-demold continuous oil storage thread structure according to claim 4, characterized in that: The contour surface of the second section of the first side surface of the thread is perpendicular to the axis of the rod body.

6. The easy-to-demold continuous oil storage thread structure according to claim 4, characterized in that: The second section of the first side surface of the thread is a spatial curved surface that gradually engages with the rod body.

7. The easy-to-demold continuous oil storage thread structure according to claim 4, characterized in that: The first section of the first side surface of the thread is connected to the second section of the first side surface of the thread via the first transition end of the first side surface of the thread; the first section of the second side surface of the thread is connected to the second section of the second side surface of the thread via the first transition end of the second side surface of the thread.

8. The easy-to-demold continuous oil storage thread structure according to claim 7, characterized in that: The first transition end of the first side surface of the thread and the first transition end of the second side surface of the thread are both rounded or chamfered.

9. The easy-to-demold continuous oil storage thread structure according to claim 8, characterized in that: The material of the screw is plastic or metal.

10. The easy-to-demold continuous oil storage thread structure according to claim 9, characterized in that: The threads are an even number.

11. The easy-to-demold continuous oil storage thread structure according to claim 10, characterized in that: The number of threads is two or four.

12. The easy-to-demold continuous oil storage thread structure according to claim 11, characterized in that: When there are two threads, the two threads extend alternately at 180°.

13. The easy-to-demold continuous oil storage thread structure according to claim 11, characterized in that: When there are four threads, the four threads extend alternately at 90 degrees.

14. A screw transmission element, characterized in that: It comprises a continuous oil storage thread structure that is easy to demould as described in any one of claims 1 to 13.

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