Shaft type phase cam positioning structure

Abstract

The invention belongs to the technical field of shaft part positioning, and particularly relates to a shaft phase cam positioning structure. The shaft type phase cam positioning structure comprises a female cam and a male cam, a first cam hole is formed in the female cam, the male cam is inserted into the first cam hole, and a plurality of arc-shaped positioning grooves which are eccentrically formed are evenly distributed in the inner wall of the first cam hole according to the circumference; a plurality of eccentric arc-shaped positioning protrusions are evenly distributed on the outer wall of the male cam in the circumferential direction, and the arc-shaped positioning grooves and the arc-shaped positioning protrusions are the same in number and matched in a one-to-one mode. According to the shaft type phase cam positioning structure, the arc-shaped positioning groove and the arc-shaped positioning protrusion which are provided with the multiple positioning points are matched for positioning, the arc-shaped positioning groove and the arc-shaped positioning protrusion are eccentrically arranged, circumferential positioning and axial positioning of paired shaft type parts are achieved in a manner of machining eccentric circles, and the shaft type phase cam positioning structure has engineering practical value.

Description

Technical Field

[0001] The invention belongs to the technical field of shaft part positioning, and in particular relates to a shaft phase cam positioning structure. Background Art

[0002] Common positioning methods for shaft parts include: key positioning, tapered sleeve positioning, locking sleeve positioning, expansion ring positioning, etc. Under the condition of ensuring transmission accuracy, the positioning method that also needs to ensure the conduction of force is limited. The most common positioning method is to open a positioning groove on the shaft and the matching hole, and embed a key in the positioning groove to ensure the relationship between the shaft and the hole.

[0003] Usually, this key positioning method only sets one positioning groove, there is a positioning error during installation, and the positioning groove on the shaft part needs to replace the processing machine tool, the processing is cumbersome, and the hardness of the key embedded in the positioning groove is usually lower than that of the hole shaft part, and the load-bearing capacity is poor, which can easily cause the key to break when the shear force is too large.

[0004] In addition, the use of the above positioning method for precision shaft parts that require higher accuracy will lead to a sharp increase in the difficulty of processing and assembly.

[0005] Currently, there is an urgent need to develop a shaft-type phase cam positioning structure. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a shaft-type phase cam positioning structure.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The shaft phase cam positioning structure of the present invention includes a female cam and a male cam, wherein the female cam is provided with a first cam hole inside, and the male cam is inserted into the first cam hole, and the inner wall of the first cam hole is provided with a plurality of eccentrically arranged arc-shaped positioning grooves evenly distributed along the circumference, and the outer wall of the male cam is provided with a plurality of eccentrically arranged arc-shaped positioning protrusions evenly distributed along the circumference, and the number of the arc-shaped positioning grooves is the same as that of the arc-shaped positioning protrusions, and they match one by one.

[0008] Specifically, a special cam structure is used for positioning (the arc-shaped positioning groove and the arc-shaped positioning protrusion cooperate for positioning, and there are multiple positioning points). The arc-shaped positioning groove and the arc-shaped positioning protrusion are both eccentrically arranged. By processing the eccentric circle, a solution is provided for the circumferential positioning and axial positioning of the paired shaft parts.

[0009] In one embodiment, four arc-shaped positioning grooves of the same shape are evenly distributed on the inner wall of the first cam hole along the circumference, and four arc-shaped positioning protrusions of the same shape are evenly distributed on the outer wall of the male cam along the circumference, and each arc-shaped positioning groove is adapted to the shape of the corresponding arc-shaped positioning protrusion.

[0010] In one embodiment, the center of each of the arc-shaped positioning grooves is located outside the center line of the first cam hole, and the centers of the four arc-shaped positioning grooves are located on the same circumference, and the circumference is concentric with the first cam hole.

[0011] In one embodiment, the center of each of the arc-shaped positioning protrusions is located outside the axis of the male cam, and the centers of the four arc-shaped positioning protrusions are located on the same circumference, and the circumference is concentric with the male cam.

[0012] In one embodiment, the radius R of the arc-shaped positioning groove has a dimensional tolerance range of 0 to +0.015, and a position tolerance range of 0.008 diameter.

[0013] Specifically, the processing of the arc-shaped positioning groove (eccentric circle) only requires the control of tolerances, including dimensional tolerances. If the dimensional tolerance of the eccentric circle radius R of the female cam is 0~+0.015, the additional position tolerance is within the diameter range of 0.008.

[0014] In one embodiment, the radius R of the arc-shaped positioning protrusion has a dimensional tolerance range of -0.03 to -0.01, and a position tolerance range of 0.008 diameter.

[0015] Specifically, the eccentric circle radius R size tolerance of the male cam is -0.03~-0.013, and its position tolerance is consistent with the eccentric circle position tolerance of the female cam. The processing result can be simply described as the female cam R size tolerance is -0.008~+0.023, and the male cam R size tolerance is -0.038~-0.002. The tolerance zone result is a transition fit. At the same time, multiple eccentric cams can be used to control the overall size tolerance. Each additional eccentric cam will shrink the tolerance zone by 0.016. Through design, matching parts with extremely high assembly precision can be obtained.

[0016] The processing of circles is relatively easy for both female and male cams, and the required tolerances can be controlled by the equipment. For example, the cam groove of the female cam can be processed by milling, and only programming is required to let the milling cutter head complete the processing of the corresponding circle; and the cam outer circle of the male cam can be processed by wire cutting. After completing the cam outer circle, the next step can be carried out, such as processing other parts of the outer circle.

[0017] In one embodiment, a second cam hole is provided inside the male cam, a second mounting hole is provided on each of the arc-shaped positioning protrusions, and an internal thread is provided in the second mounting hole.

[0018] In one embodiment, the female cam has a plurality of first mounting holes evenly distributed along the circumference.

[0019] The shaft phase cam positioning structure of the present invention is reasonably designed. While facilitating processing, it improves the accuracy of parts through positioning and assembly. An outward convex cam structure is arranged at the end of the shaft part. The structural cam can be a single cam or a multi-cam structure. Only wire cutting is required for processing. The corresponding hole parts are simpler and only require washing and machining to complete.

[0020] The shaft phase cam positioning structure of the present invention adopts a special cam structure for positioning (the arc-shaped positioning groove and the arc-shaped positioning protrusion cooperate for positioning, and there are multiple positioning points). The arc-shaped positioning groove and the arc-shaped positioning protrusion are both eccentrically arranged. By processing the eccentric circle, a solution is provided for the circumferential positioning and axial positioning of the paired shaft parts.

[0021] In short, the shaft phase cam positioning structure of the present invention is positioned by cooperating an arc-shaped positioning groove and an arc-shaped positioning protrusion with multiple positioning points. The arc-shaped positioning groove and the arc-shaped positioning protrusion are both eccentrically arranged. By machining eccentric circles, the circumferential positioning and axial positioning of paired shaft parts are achieved, which has practical engineering value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a female cam in a shaft-type phase cam positioning structure of the present invention; Figure 2 It is a structural schematic diagram of a male cam in a shaft-type phase cam positioning structure of the present invention; Figure 3 yes Figure 2 A cross-sectional view of Figure 4 It is a schematic diagram of the shaft phase cam positioning structure of the present invention.

[0023] In the figure, 1. female cam; 2. arc-shaped positioning groove; 3. male cam; 4. arc-shaped positioning protrusion; 5. installation tooling. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They 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.

[0028] Example 1: Figure 1~Figure 4 As shown, this embodiment provides a shaft-type phase cam positioning structure, including a female cam 1 and a male cam 3, a first cam hole is arranged inside the female cam 1, the male cam 3 is inserted into the first cam hole, a plurality of eccentrically arranged arc-shaped positioning grooves 2 are evenly distributed on the inner wall of the first cam hole according to the circumference, a plurality of eccentrically arranged arc-shaped positioning protrusions 4 are evenly distributed on the outer wall of the male cam 3 according to the circumference, the number of the arc-shaped positioning grooves 2 and the arc-shaped positioning protrusions 4 are the same, and they match one by one.

[0029] Specifically, a special cam structure is used for positioning (the arc-shaped positioning groove 2 and the arc-shaped positioning protrusion cooperate for positioning, and there are multiple positioning points). The arc-shaped positioning groove 2 and the arc-shaped positioning protrusion are both eccentrically arranged. By machining the eccentric circle, a solution is provided for the circumferential positioning and axial positioning of the paired shaft parts.

[0030] Example 2: Figure 1~Figure 4 As shown, this embodiment provides a shaft-type phase cam positioning structure, including a female cam 1 and a male cam 3, a first cam hole is arranged inside the female cam 1, the male cam 3 is inserted into the first cam hole, a plurality of eccentrically arranged arc-shaped positioning grooves 2 are evenly distributed on the inner wall of the first cam hole according to the circumference, a plurality of eccentrically arranged arc-shaped positioning protrusions 4 are evenly distributed on the outer wall of the male cam 3 according to the circumference, the number of the arc-shaped positioning grooves 2 and the arc-shaped positioning protrusions 4 are the same, and they match one by one.

[0031] The inner wall of the first cam hole has four arc-shaped positioning grooves 2 evenly distributed along the circumference, and the outer wall of the male cam 3 has four arc-shaped positioning protrusions 4 evenly distributed along the circumference. Each arc-shaped positioning groove 2 is adapted to the corresponding arc-shaped positioning protrusion 4 in shape.

[0032] The center of each arc-shaped positioning groove 2 is located outside the center line of the first cam hole, and the centers of the four arc-shaped positioning grooves 2 are located on the same circumference, and the circumference is concentric with the first cam hole.

[0033] Example 3: Figure 1~Figure 4 As shown, this embodiment provides a shaft-type phase cam positioning structure, including a female cam 1 and a male cam 3, a first cam hole is arranged inside the female cam 1, the male cam 3 is inserted into the first cam hole, a plurality of eccentrically arranged arc-shaped positioning grooves 2 are evenly distributed on the inner wall of the first cam hole according to the circumference, a plurality of eccentrically arranged arc-shaped positioning protrusions 4 are evenly distributed on the outer wall of the male cam 3 according to the circumference, the number of the arc-shaped positioning grooves 2 and the arc-shaped positioning protrusions 4 are the same, and they match one by one.

[0034] The inner wall of the first cam hole has four arc-shaped positioning grooves 2 evenly distributed along the circumference, and the outer wall of the male cam 3 has four arc-shaped positioning protrusions 4 evenly distributed along the circumference. Each arc-shaped positioning groove 2 is adapted to the corresponding arc-shaped positioning protrusion 4 in shape.

[0035] The center of each arc-shaped positioning groove 2 is located outside the center line of the first cam hole, and the centers of the four arc-shaped positioning grooves 2 are located on the same circumference, and the circumference is concentric with the first cam hole.

[0036] The center of each arc-shaped positioning protrusion 4 is located outside the axis of the male cam 3 . The centers of the four arc-shaped positioning protrusions 4 are located on the same circumference, and the circumference is concentric with the male cam 3 .

[0037] Example 4: Figure 1~Figure 4 As shown, this embodiment provides a shaft-type phase cam positioning structure, including a female cam 1 and a male cam 3, a first cam hole is arranged inside the female cam 1, the male cam 3 is inserted into the first cam hole, a plurality of eccentrically arranged arc-shaped positioning grooves 2 are evenly distributed on the inner wall of the first cam hole according to the circumference, a plurality of eccentrically arranged arc-shaped positioning protrusions 4 are evenly distributed on the outer wall of the male cam 3 according to the circumference, the number of the arc-shaped positioning grooves 2 and the arc-shaped positioning protrusions 4 are the same, and they match one by one.

[0038] The inner wall of the first cam hole has four arc-shaped positioning grooves 2 evenly distributed along the circumference, and the outer wall of the male cam 3 has four arc-shaped positioning protrusions 4 evenly distributed along the circumference. Each arc-shaped positioning groove 2 is adapted to the corresponding arc-shaped positioning protrusion 4 in shape.

[0039] The center of each arc-shaped positioning groove 2 is located outside the center line of the first cam hole, and the centers of the four arc-shaped positioning grooves 2 are located on the same circumference, and the circumference is concentric with the first cam hole.

[0040] The center of each arc-shaped positioning protrusion 4 is located outside the axis of the male cam 3 . The centers of the four arc-shaped positioning protrusions 4 are located on the same circumference, and the circumference is concentric with the male cam 3 .

[0041] The radius R dimension tolerance range of the arc-shaped positioning groove 2 is 0~+0.015, and the position tolerance is within the diameter range of 0.008.

[0042] Specifically, the processing of the arc-shaped positioning groove 2 (eccentric circle) only requires the control of tolerances, including dimensional tolerances. For example, the dimensional tolerance of the eccentric circle radius R of the female cam 1 in the schematic diagram is 0~+0.015, and the additional position tolerance is within the diameter range of 0.008.

[0043] The radius R size tolerance range of the arc-shaped positioning protrusion is -0.03~-0.01, and the position tolerance is within the diameter range of 0.008.

[0044] Specifically, the dimensional tolerance of the eccentric circle radius R of the male cam 3 is -0.03~-0.013, and its position tolerance is consistent with the eccentric circle position tolerance of the female cam 1. The processing result can be simply described as the dimensional tolerance of the female cam 1R is -0.008~+0.023, and the dimensional tolerance of the male cam 3R is -0.038~-0.002. The tolerance zone result is a transition fit. At the same time, multiple eccentric cams can be used to control the overall dimensional tolerance. Each additional eccentric cam will shrink the tolerance zone by 0.016. Through design, matching parts with extremely high assembly accuracy can be obtained.

[0045] The processing of circles is relatively easy for both the female cam 1 and the male cam 3, and the required tolerances can be controlled by the equipment. For example, the cam groove of the female cam 1 can be processed by milling, and only programming is required to let the milling cutter head complete the processing of the corresponding circle; and the cam outer circle of the male cam 3 can be processed by wire cutting. After completing the cam outer circle, the next step can be carried out, such as processing other parts of the outer circle.

[0046] A second cam hole is arranged inside the male cam 3 , and a second mounting hole is arranged on each arc-shaped positioning protrusion 4 . An internal thread is arranged inside the second mounting hole.

[0047] The female cam 1 is provided with a plurality of first mounting holes evenly distributed along the circumference.

[0048] Figure 4 It is a schematic diagram of the female cam 1 and the male cam 3 being installed in the installation tool 5.

Claims

1. A shaft phase cam positioning structure, characterized in that: The invention comprises a female cam (1) and a male cam (3), wherein a first cam hole is arranged inside the female cam (1), and the male cam (3) is inserted into the first cam hole. The inner wall of the first cam hole is provided with a plurality of eccentrically arranged arc-shaped positioning grooves (2) evenly distributed along the circumference, and the outer wall of the male cam (3) is provided with a plurality of eccentrically arranged arc-shaped positioning protrusions (4) evenly distributed along the circumference. The number of the arc-shaped positioning grooves (2) and the number of the arc-shaped positioning protrusions (4) are the same and they are matched one by one.

2. The shaft-type phase cam positioning structure according to claim 1, characterized in that: The inner wall of the first cam hole is provided with four arc-shaped positioning grooves (2) of the same shape evenly distributed along the circumference, and the outer wall of the male cam (3) is provided with four arc-shaped positioning protrusions (4) of the same shape evenly distributed along the circumference, and each of the arc-shaped positioning grooves (2) is adapted to the shape of the corresponding arc-shaped positioning protrusion (4).

3. The shaft-type phase cam positioning structure according to claim 2, characterized in that: The center of each arc-shaped positioning groove (2) is located outside the center line of the first cam hole, and the centers of the four arc-shaped positioning grooves (2) are located on the same circumference, and the circumference is concentric with the first cam hole.

4. The shaft-type phase cam positioning structure according to claim 2, characterized in that: The center of each arc-shaped positioning protrusion (4) is located outside the axis of the male cam (3); the centers of the four arc-shaped positioning protrusions (4) are located on the same circumference, and the circumference is concentric with the male cam (3).

5. The shaft-type phase cam positioning structure according to claim 1, characterized in that: The radius R of the arc-shaped positioning groove (2) has a dimensional tolerance range of 0 to +0.015, and a position tolerance range of 0.008 diameter.

6. The shaft-type phase cam positioning structure according to claim 5, characterized in that: The radius R of the arc-shaped positioning protrusion (4) has a dimensional tolerance range of -0.03 to -0.01, and a position tolerance range of 0.008 diameter.

7. The shaft-type phase cam positioning structure according to claim 1, characterized in that: A second cam hole is provided inside the male cam (3), and a second mounting hole is provided on each of the arc-shaped positioning protrusions (4), wherein an internal thread is provided in the second mounting hole.

8. The shaft-type phase cam positioning structure according to claim 1, characterized in that: The female cam (1) is provided with a plurality of first mounting holes evenly distributed along the circumference.

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