Screw drive structure

Abstract

The utility model discloses a screw transmission structure, which belongs to the technical field of screws. It mainly comprises a screw and a nut sleeved on the screw, wherein an outer circumferential wall of the screw is provided with an external thread, and an inner circumferential wall of the nut is provided with an internal thread, and when the external thread is screwed into the internal thread, the external thread and the internal thread are in line contact. The screw transmission structure of the utility model can solve the problems of high processing requirements and processing difficulty.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rods, in particular to a screw rod transmission structure. Background Art

[0002] The existing screw transmission structure realizes thrust transmission through trapezoidal threads or circular arc threads. However, the thread structure that realizes thrust transmission in the existing screw transmission structure is through surface contact. In order to ensure the transmission accuracy, the processing requirements and difficulty of the surface contact position are relatively high, especially for small and micro screw transmission structures.

[0003] Therefore, it is necessary to provide a new screw transmission structure. Utility Model Content

[0004] Based on the above problems existing in the prior art, the purpose of the embodiments of the present utility model is to provide a screw transmission structure that can solve the problems of high processing requirements and high processing difficulty.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a screw transmission structure, including a screw and a nut sleeved on the screw, the outer peripheral wall of the screw is convexly provided with an external thread, and the inner peripheral wall of the nut is provided with an internal thread, when the external thread is screwed into the internal thread, there is a linear contact between the external thread and the internal thread.

[0006] Furthermore, the longitudinal cross-sectional profile of the internal thread is an arc-shaped structure or a trapezoidal structure, and the longitudinal cross-sectional profile of the external thread is an arc-shaped structure or a trapezoidal structure. When the external thread and the internal thread are in mating contact, two contact lines are formed between the external thread and the internal thread, which are spaced apart in the axial direction of the screw or nut, and the contact lines are in a spiral line structure. The two contact lines are respectively located on both sides of the opposite ends of the external thread or the internal thread facing the screw or nut.

[0007] Furthermore, the longitudinal section profile of the internal thread is an arc-shaped structure, the longitudinal section profile of the external thread is also an arc-shaped structure, and the curvature of the longitudinal section profile of the external thread is greater than the curvature of the longitudinal section profile of the internal thread.

[0008] Furthermore, the longitudinal section profile of the internal thread is a trapezoidal structure, and the longitudinal section profile of the external thread is an arc structure.

[0009] Furthermore, the longitudinal section profile of the internal thread is an arc-shaped structure, and the longitudinal section profile of the external thread is a trapezoidal structure.

[0010] Furthermore, when the external thread and the internal thread are in mating contact, a gap is provided between the crest of the external thread and the bottom of the internal thread.

[0011] The beneficial effects of the utility model are as follows: in the screw transmission structure provided by the utility model, when the external thread is screwed into the internal thread, there is line contact between the external thread and the internal thread. Since the external thread and the internal thread only need to be matched through line contact, compared with the surface contact method in the prior art, the processing requirements and difficulty are lower, and it is suitable for application in small or micro machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] In the figure: Figure 1 A cross-sectional schematic diagram of a screw transmission structure provided in an embodiment of the utility model.

[0014] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle.

[0015] Among them, the reference numerals in the figures are: 1, screw; 11, external thread; 2, nut; 21, internal thread; 3, contact line. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0018] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0021] Please refer to Figure 1 and Figure 2 As shown, a screw transmission structure provided by the utility model is now described. The screw transmission structure includes a screw 1 and a nut 2 sleeved on the screw 1. An external thread 11 is convexly provided on the outer peripheral wall of the screw 1, and an internal thread 21 is provided on the inner peripheral wall of the nut 2. When the external thread 11 is screwed into the internal thread 21, the external thread 11 and the internal thread 21 are in line contact. Since the external thread 11 and the internal thread 21 only need to be matched through line contact, compared with the surface contact method in the prior art, the processing requirements and processing difficulty are lower, so that the screw transmission structure is compact in size and occupies a small space, and is suitable for small or micro equipment, for example: it can be well applied to the joint position of humanoid robots, aerospace and other fields.

[0022] like Figure 2 As shown, in some embodiments, the longitudinal section profile of the internal thread 21 is an arc structure or a trapezoidal structure, and the longitudinal section profile of the external thread 11 is an arc structure or a trapezoidal structure. When the external thread 11 and the internal thread 21 are in contact with each other, two contact lines 3 are formed between the external thread 11 and the internal thread 21, which are spaced apart in the axial direction of the screw 1 or the nut 2. The contact lines 3 are in a spiral structure, and the two contact lines 3 are respectively located on both sides of the two opposite ends of the external thread 11 or the internal thread 21 facing the screw 1 or the nut 2. In this way, when the screw 1 rotates clockwise relative to the nut 2, the internal thread 21 and the external thread 11 will generate a pushing force in the first direction at one of the contact lines 3 to achieve force transmission, or when the screw 1 rotates counterclockwise relative to the nut 2, the internal thread 21 and the external thread 11 will generate a pushing force in the opposite direction to the first direction at another contact line 3 to achieve force transmission.

[0023] like Figure 2 As shown, in some embodiments, the longitudinal cross-sectional profile of the internal thread 21 is an arc-shaped structure, the longitudinal cross-sectional profile of the external thread 11 is also an arc-shaped structure, and the curvature of the longitudinal cross-sectional profile of the external thread 11 is greater than the curvature of the longitudinal cross-sectional profile of the internal thread 21, so that when the external thread 11 and the internal thread 21 are in mating contact, two contact lines 3 are formed between the external thread 11 and the internal thread 21, which are spaced apart in the axial direction of the screw 1 or the nut 2, and the contact lines 3 are in a spiral structure. The two contact lines 3 are respectively located on both sides of the opposite ends of the external thread 11 or the internal thread 21 facing the screw 1 or the nut 2.

[0024] In some other embodiments not shown in the figures, the longitudinal cross-sectional profile of the internal thread 21 is a trapezoidal structure, and the longitudinal cross-sectional profile of the external thread 11 is an arcuate structure, so that when the external thread 11 and the internal thread 21 are in mating contact, two contact lines 3 are formed between the external thread 11 and the internal thread 21, which are spaced apart in the axial direction of the screw 1 or the nut 2, and the contact lines 3 are in a spiral structure. The two contact lines 3 are respectively located on both sides of the opposite ends of the external thread 11 or the internal thread 21 facing the screw 1 or the nut 2.

[0025] In some other embodiments not shown in the figures, the longitudinal cross-sectional profile of the internal thread 21 is an arc-shaped structure, and the longitudinal cross-sectional profile of the external thread 11 is a trapezoidal structure, so that when the external thread 11 and the internal thread 21 are in mating contact, two contact lines 3 are formed between the external thread 11 and the internal thread 21, which are spaced apart in the axial direction of the screw 1 or the nut 2, and the contact lines 3 are in a spiral structure. The two contact lines 3 are respectively located on both sides of the opposite ends of the external thread 11 or the internal thread 21 facing the screw 1 or the nut 2.

[0026] like Figure 2 As shown, in some embodiments, when the external thread 11 and the internal thread 21 are in mating contact, a gap is spaced between the crest of the external thread 1 and the bottom of the internal thread 21 .

[0027] In some other embodiments not shown in the figures, the longitudinal cross-sectional profile of the internal thread 21 is an arc-shaped structure or a trapezoidal structure, and the longitudinal cross-sectional profile of the external thread 11 is an arc-shaped structure or a trapezoidal structure. When the external thread 11 and the internal thread 21 are in mating contact, a contact line 3 is formed between the external thread 11 and the internal thread 21, and the contact line 3 is located between the top of the external thread 11 and the bottom of the internal thread 21, and the contact line 3 is a spiral structure.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw transmission structure, characterized in that: It comprises a screw rod and a nut sleeved on the screw rod, wherein an external thread is convexly arranged on the outer peripheral wall of the screw rod, and an internal thread is arranged on the inner peripheral wall of the nut, and when the external thread is screwed into the internal thread, the external thread and the internal thread are in line contact.

2. The screw transmission structure according to claim 1, characterized in that: The longitudinal cross-sectional profile of the internal thread is an arc-shaped structure or a trapezoidal structure, and the longitudinal cross-sectional profile of the external thread is an arc-shaped structure or a trapezoidal structure. When the external thread and the internal thread are in mating contact, two contact lines are formed between the external thread and the internal thread, which are spaced apart in the axial direction of the screw or nut. The contact lines are in a spiral line structure, and the two contact lines are respectively located on both sides of the opposite ends of the external thread or the internal thread facing the screw or the nut.

3. The screw transmission structure according to claim 2, characterized in that: The longitudinal section profile of the internal thread is an arc-shaped structure, the longitudinal section profile of the external thread is also an arc-shaped structure, and the curvature of the longitudinal section profile of the external thread is greater than the curvature of the longitudinal section profile of the internal thread.

4. The screw transmission structure according to claim 2, characterized in that: The longitudinal section profile of the internal thread is a trapezoidal structure, and the longitudinal section profile of the external thread is an arcuate structure.

5. The screw transmission structure according to claim 2, characterized in that: The longitudinal section profile of the internal thread is an arc-shaped structure, and the longitudinal section profile of the external thread is a trapezoidal structure.

6. The screw transmission structure according to claim 1, characterized in that: When the external thread and the internal thread are in contact with each other, a gap is provided between the crest of the external thread and the bottom of the internal thread.

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