Mechanism for limiting rotation motion angle

Abstract

The utility model provides a mechanism for limiting a rotation motion angle, which belongs to the field of mechanical structures, is particularly suitable for limiting a rotation angle of a main shaft in a ZD6 switch machine structure, and comprises an annular part and a prolate part which are respectively provided with a first inner hole and a second inner hole; the annular part and the flat and long part are attached to each other, and the first inner hole and the second inner hole are coaxial. The first inner hole is of a spline structure and is matched with a spindle spline; the minimum inner diameter of the second inner hole is larger than the outer diameter of the spline structure. The mutually attached end surfaces of the annular part and the flat and long part are respectively provided with a boss and a groove for accommodating the boss which are matched with each other; the face, away from the circle center, of the groove is an arc face, and the circle center of the arc face coincides with the circle center of the spline structure. And the groove and the boss are nested and matched by using a jaw. According to the mechanism, the collision between the stop bolt and the stop pile is converted into the collision between the small end of the prolate part and the stop pile, and then the prolate part and the jaw structure of the annular part are collided, so that the stress section is enlarged, the strength of the part is improved, and the impact life of the part is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical structure field, concretely relates to a mechanism of limiting rotation motion angle. BACKGROUND

[0002] ZD6 switch machine is the largest switch conversion switch equipment in current railway traffic in China, and is widely used in national railway general speed line, urban rail transit, factory and mine transport line.

[0003] ZD6 switch machine drives rack block movement through locking gear rotation, and then makes action rod extend and retract to convert switch. Figure 1 As shown in the figure, the locking gear and the stop bolt are connected with the main shaft through spline, and the three move together. Figure 2 As shown in the figure, the locking gear and the stop bolt are connected with the main shaft through spline, and the three move together.

[0004] In use, the collision of the stop bolt and the stop post occurs in each action of ZD6 switch machine to consume the residual energy. Figure 3 As shown in the figure, the collision position of the stop bolt and the connecting section of the body is small, and fatigue is easy to occur. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a mechanism of limiting rotation motion angle, which converts the collision of the stop bolt and the stop post into the collision of the small end of the flat and long part and the stop post, the flat and long part and the annular part move relatively, friction occurs or the spring is deformed, then the flat and long part and the annular part collide in the toothed structure, in the process, the friction of the parts or the deformation of the spring consumes energy, reduces the energy of the toothed structure collision, and the stress section and the collision section of the toothed structure are increased compared with the original stop bolt and stop post structure, so that the stress level of the collision process is reduced, the impact life of the parts is prolonged without changing the material performance.

[0006] The utility model provides the following technical scheme:

[0007] A mechanism of limiting rotation motion angle, comprising an annular part and a flat and long part, respectively having a first inner hole and a second inner hole;

[0008] The ring-shaped part and the oblong part are attached to each other; the ring-shaped part has a first inner hole which is a spline structure and matches with the spline of the main shaft; the oblong part has a second inner hole whose minimum inner diameter is larger than the outer diameter of the spline structure; the first inner hole and the second inner hole are coaxial;

[0009] The end faces of the ring-shaped part and the oblong part which are attached to each other have a boss and a groove which accommodate the boss and match with each other; the faces of the boss and the groove which are far away from the center are arc faces;

[0010] The boss and the groove form a mortise and tenon structure to be nested; the boss and the groove can be relatively rotated and the end faces are in contact to stop each other.

[0011] Preferably, there is a friction material between the attached faces of the ring-shaped part and the oblong part, and when the ring-shaped part and the oblong part are relatively rotated, the oblong part is subjected to the friction force.

[0012] Preferably, the friction material is an elastic material.

[0013] Preferably, there is an elastic element between the attached faces of the ring-shaped part and the oblong part.

[0014] Preferably, the elastic element is a torsion spring.

[0015] Preferably, the corresponding central angle of the groove profile is larger than the corresponding central angle of the boss profile.

[0016] Preferably, the groove is located on the end face of the oblong part and the boss is located on the end face of the ring-shaped part; or, the groove is located on the end face of the ring-shaped part and the boss is located on the end face of the oblong part.

[0017] The utility model has the advantages of:

[0018] The utility model provides a mechanism for limiting the rotation angle, the relative rotation angle of the ring-shaped part and the oblong part can be adjusted, and the mechanism can be adapted to a large range of rotation angle limitation; the friction between the ring-shaped part and the oblong part during the relative rotation process can reduce the energy during the collision and stopping process of the boss and the groove, and prolong the impact life of the parts; according to the energy and stress during the impact process, the boss connecting section and the groove remaining section which meet the requirements can be designed, and the design is limited and flexible. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the structure diagram of ZD6 main shaft;

[0020] Figure 2 is the schematic view of the stop bolt and the stop pile in the prior art;

[0021] Figure 3 is a schematic diagram of a stop bolt structure in the prior art;

[0022] Figure 4 is a schematic diagram of a ring-shaped part structure in Embodiment 1;

[0023] Figure 5 is a schematic diagram of an oblong part structure in Embodiment 1;

[0024] Figure 6 is a schematic diagram of a ring-shaped part and an oblong part nested fitting in Embodiment 1;

[0025] Figure 7 is a schematic diagram of a ring-shaped part and an oblong part assembling in Embodiment 1;

[0026] Figure 8 is a schematic diagram of a ring-shaped part and an oblong part assembling in Embodiment 2;

[0027] Figure 9 is a schematic diagram of a ring-shaped part and an oblong part assembling in Embodiment 3;

[0028] In the figure, 1, ring-shaped part; 2, oblong part; 3, first inner hole; 4, second inner hole; 5, boss; 6, groove; 7, stop bolt; 8, stop pile. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clearly and clearly, the following will be further described in detail by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0030] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0031] The terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features; in the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0032] Embodiment 1

[0033] The stop pin and the stop pile collide to consume the residual energy in each action of the ZD6 switch machine. Due to the structure, the collision position of the stop pin and the connecting section of the body are small, and multiple collision fatigue fracture easily occurs.

[0034] Therefore, the embodiment provides a mechanism for limiting the rotation angle. The stop pin is replaced by the structure of the utility model. When the rotation is limited, the small end of the flat long part 2 collides with the stop pile and the toothed structure of the flat long part 2 and the ring part 1 collides to limit the rotation. Finally, the main shaft stops at the set position. Specifically, as shown in the figure, Figures 4-6 Figure 4 the end face of the ring part 1 has a boss 5, Figure 5 the flat long part 2 has a groove 6, Figure 6 the two are nested to form a toothed structure, Figure 7 and the assembly structure is shown. Specifically, the ring part 1 and the flat long part 2 have a first inner hole 3 and a second inner hole 4, respectively. The inner hole of the ring part 1 is a spline structure and is matched with the spline of the main shaft. The end face of the ring part 1 matched with the flat long part 2 has a boss 5. The inner hole of the flat long part 2 is larger than the outer diameter of the spline of the main shaft. The flat long part 2 has a groove 6 accommodating the boss 5. The groove 6 is communicated with the inner hole. The outer wall of the groove 6 is a circular arc surface with the rotation center as the center. The two ends of the boss 5 form a stop surface with the two ends of the groove 6. The two form a nested matching structure with a certain relative rotation angle. That is, the boss 5 and the groove 6 are in contact after the two relatively rotate by a limited angle, so that the two cannot continue to relatively rotate in the same direction, but can relatively rotate in the opposite direction. After the boss 5 and the groove 6 are in contact in the opposite direction, the two cannot continue to relatively rotate in the same direction.

[0035] The boss 5 in the embodiment is an arc boss 5. The outer wall surface is a circular arc surface, and the inner wall is an extension surface of the spline. The boss 5 can also be a cylindrical structure or a square column structure.

[0036] The improved structure of the embodiment is that the small end of the flat long part 2 collides with the stop pile, and then the toothed structure of the flat long part 2 and the ring part 1 collides, so that the main shaft stops at the set position. The whole end of the flat long part 2 collides with the stop pin, and there is no dangerous section. By selecting appropriate size, the section can be equivalent to the section of the stop pile, so that the two have equal strength. After the boss 5 and the groove 6 collide, the ring part 1 and the flat long part 2 are subjected to shear force. Since the shear surface is significantly larger than the original shear surface of the stop pin, when the same material is used, the number of impacts and collisions is increased, the ability to withstand static load is also increased, that is, the impact fatigue life is increased.

[0037] ​In another embodiment, the groove 6 is located on the end face of the annular part 1, and the boss 5 is located on the end face of the elongated part 2, that is, the positions of the boss 5 and the groove 6 can be interchanged, and the two can also form a tooth-embedded structure for replacing the stop bolt.

[0038] Example 2

[0039] Special, such as Figure 8 As shown, the groove 6 of the elongated part 2 of the present invention is provided on the outer wall, and both ends of the groove 6 are stop surfaces. The arcuate inner wall surface of the boss 5 of the annular part 1 slides with the wall surface of the groove 6 to form a tooth-embedded structure.

[0040] Example 3

[0041] In particular, the boss 5 of the annular part 1 in the present invention is a cylindrical boss 5, or can be a prismatic boss 5, such as Figure 9 As shown, Figure 9 The cylindrical boss 5 and the groove 6 form a tooth-embedded structural relationship, and the contact surface between the two is an arc surface, which does not cause interference during rotation.

[0042] Example 4

[0043] In this embodiment, friction material is added between the two parts to dissipate kinetic energy through friction. Furthermore, two torsion springs with opposite rotations can be placed between the two parts, or a single torsion spring can be composed of two parts with different rotations. This torsion spring structure restricts relative motion between the two parts in both directions, maintaining a neutral position when not subject to external forces, ensuring that the edges of the boss 5 and the groove 6 do not contact each other.

[0044] In this embodiment, the mechanism separates the stopper into a ring-shaped component 1 and an elongated component 2. Rotational restriction is achieved through the collision of the small end of the elongated component 2 with the stopper, and the collision of the tooth structure of the elongated component 2 with the ring-shaped component 1, ultimately stopping the spindle at the set position. In this utility model, the entire end of the elongated component 2 collides with the stopper, eliminating any hazardous cross-section. By selecting appropriate dimensions, its cross-section can be made equivalent to that of the stopper, achieving equal strength between the two.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mechanism for limiting the angle of rotational movement, characterized in that The ring-shaped part (1) and the flat long part (2) are mutually adhered; the ring-shaped part (1) has a first inner hole (3) which is a spline structure and matches with the main shaft spline; the flat long part (2) has a second inner hole (4) whose minimum inner diameter is greater than the outer diameter of the spline structure; the first inner hole (3) and the second inner hole (4) are coaxial; The end face of the ring-shaped part (1) and the flat long part (2) mutually adhered has a boss (5) and a groove (6) accommodating the boss (5) which mutually match; the face of the groove (6) far from the center is a circular arc face, and the center of the circular arc face coincides with the center of the spline structure; The groove (6) and the boss (5) form a mortise and tenon structure to be nested and matched; they can relatively rotate and the end face contacts to mutually stop. The ring-shaped part (1) and the flat long part (2) have a friction material between the adhered faces; when the ring-shaped part (1) and the flat long part (2) relatively rotate, the flat long part (2) will be affected by the friction force.

2. The mechanism for limiting the angle of rotational movement according to claim 1, characterized in that, The friction material is an elastic material.

3. The mechanism for limiting the angle of rotational movement according to claim 2, characterized in that, The ring-shaped part (1) and the flat long part (2) have an elastic element between the adhered faces.

4. The mechanism for limiting the angle of rotational movement according to claim 1, characterized in that, The elastic element is a torsion spring.

5. The mechanism for limiting the angle of rotational movement according to claim 4, characterized in that, The circular central angle corresponding to the profile of the groove (6) is greater than the circular central angle corresponding to the profile of the boss (5).

6. The mechanism for limiting the angle of rotational movement according to claim 1, characterized in that, The groove (6) is located at the end face of the flat long part (2), and the boss (5) is located at the end face of the ring-shaped part (1); or, the groove (6) is located at the end face of the ring-shaped part (1), and the boss (5) is located at the end face of the flat long part (2).

7. The mechanism for limiting the angle of rotational movement according to claim 1, characterized in that, ​

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