Speed change mechanism of motor

Abstract

The utility model relates to a speed change mechanism of a motor, which comprises a shell II, a swash plate II and a plunger hole are arranged in the shell II, a spring and a speed regulation plunger are arranged in the plunger hole, the speed regulation plunger is of a cylinder structure, a spherical surface is arranged at one end of the speed regulation plunger and abuts against the swash plate II, a cavity is arranged at the other end of the speed regulation plunger, one end of the spring is positioned in the cavity, and the other end of the spring is positioned in the cavity. The other end abuts against the bottom wall of the plunger hole. By arranging the spring, the speed regulating plunger is always in contact with the swash plate II, and the contact points are kept consistent, so that the swash plate II is prevented from being impacted during high and low speed switching, and the service life of the swash plate II is prolonged; the speed regulation plunger is of a cylinder structure, the fit clearance between the speed regulation plunger and the plunger hole is small, the leakage amount is small, and the motor efficiency is hardly influenced, so that a sealing ring does not need to be installed on the speed regulation plunger, and the problem that the coaxiality of the upper size and the lower size of a sealing groove in a conical plunger in the prior art is not easy to control is solved; the motion stability is effectively improved, the product structure is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor speed change, in particular to a speed change mechanism of a motor. Background Art

[0002] Most existing crawler excavators commonly use large-tonnage motors. The speed change mechanism of the motor includes a housing 5, a plunger hole is provided in the housing 5, and a conical plunger 1 is installed in the plunger hole. Since the end diameter of the conical plunger 1 is small, the leakage is large and affects the motor efficiency. Therefore, a seal needs to be installed on the conical plunger 1. Specifically, a sealing groove is processed on the conical plunger 1, and a seal 2 is installed on the sealing groove. The seal 2 is used to seal the gap between the speed change plunger and the plunger hole. A steel ball 3 is installed on the upper end of the conical plunger 1. The steel ball 3 cooperates with the ball socket hole on the swash plate 4. When the speed is switched, high-pressure oil is introduced into the plunger hole, and the high-pressure oil drives the conical plunger 1 to move upward, thereby pushing the swash plate 4 to swing through the steel ball 3 to achieve the speed change of the motor. See Figure 6 As shown in the figure, the speed change plunger is a conical structure with a sealing groove, and is assembled with a seal. Its processing technology is relatively complicated, and the coaxiality of the upper and lower dimensions of the sealing groove is difficult to control, resulting in uneven clearance between the speed change plunger and the plunger hole, and the plunger is prone to getting stuck when the excavator is moving. Utility Model Content

[0003] The utility model aims at solving the existing technical problems and provides a speed changing mechanism of a motor.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a speed changing mechanism of a motor, comprising a second shell, a second swash plate and a plunger hole being arranged in the second shell, a spring and a speed regulating plunger being installed in the plunger hole, the speed regulating plunger being a cylindrical structure, a spherical surface being arranged at one end of the speed regulating plunger, the spherical surface being abutted against the second swash plate, a cavity being arranged at the other end of the speed regulating plunger, one end of the spring being located in the cavity, and the other end being abutted against the bottom wall of the plunger hole.

[0005] The beneficial effects of the utility model are as follows: by arranging a spring, the speed regulating plunger is always in contact with the swash plate 2, and the contact point is kept consistent, thereby avoiding collision with the swash plate 2 when switching between high and low speeds, and improving the service life of the swash plate 2; by arranging a spherical surface at the end of the speed regulating plunger, the flexibility of the contact between the speed regulating plunger and the swash plate 2 is increased, thereby avoiding the occurrence of jamming; the speed regulating plunger adopts a cylindrical structure, and the fitting clearance between the speed regulating plunger and the plunger hole is small, and the small leakage hardly affects the motor efficiency, so there is no need to install a sealing ring on the speed regulating plunger, thereby solving the problem of difficult control of the coaxiality of the upper and lower dimensions of the sealing groove on the conical plunger in the prior art, effectively improving the movement stability, simplifying the product structure and reducing the production cost.

[0006] On the basis of the above technical solution, the present invention can also make the following improvements to the above technical solution:

[0007] Furthermore, an arc-shaped groove is provided on the second swash plate, and the arc-shaped groove extends along the radial direction of the second swash plate, and the spherical surface is slidably matched with the arc-shaped groove.

[0008] The beneficial effect of adopting the above further technical solution is that the spherical surface of the speed regulating plunger slides along the arc groove, ensuring that the speed regulating plunger drives the second swash plate to move smoothly.

[0009] Furthermore, the plunger hole is arranged at an angle.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the inclined cylindrical plunger hole can reduce the force on the spring, allowing the speed regulating plunger to slide up and down smoothly during operation, preventing jamming, and making the high-speed and low-speed switching response more sensitive.

[0011] Furthermore, a small clearance fit is adopted between the speed regulating plunger and the inner wall of the plunger hole.

[0012] The beneficial effect of adopting the above further technical solution is that it solves the problem in the prior art that due to the uneven compression of the seal between the tapered plunger and the plunger hole, the tapered plunger deflects and causes jamming when moving, thereby causing unstable speed change of the swash plate.

[0013] Furthermore, a guiding slope is provided at the lower end of the speed regulating plunger.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that the inclined surface at the lower end of the speed regulating plunger plays a guiding role, which facilitates the installation of the speed regulating plunger in the plunger hole, reduces the difficulty of installation, and allows the oil to enter the lower end of the plunger gradually, thereby improving the smoothness of the movement of the speed regulating plunger.

[0015] Furthermore, a slot is connected to the lower end of the plunger hole, and the slot is connected to a speed change oil circuit, and the speed change oil circuit is arranged in the second housing.

[0016] The beneficial effect of adopting the above further technical solution is that the high-pressure oil enters the plunger hole through the speed change oil circuit and the slot hole, drives the speed regulating plunger to move, thereby driving the second swash plate to swing, thereby realizing the speed change function.

[0017] Furthermore, a pivot hole is provided on the second swash plate, and the end of the pivot hole is a concave spherical surface.

[0018] The beneficial effect of adopting the above further technical solution is that the pivot hole cooperates with the pivot to support the second swash plate to achieve the speed change of the motor, and the concave spherical structure can ensure the smoothness of power transmission and avoid jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the speed change mechanism of the utility model;

[0020] Figure 2 It is a schematic diagram of the swash plate 2 of the utility model;

[0021] Figure 3 It is a schematic diagram of the speed change oil circuit and slot holes in the utility model;

[0022] Figure 4 It is a schematic diagram of the speed regulating plunger of the utility model;

[0023] Figure 5 It is a schematic diagram of the cooperation between the pivot and the second swash plate of the utility model;

[0024] Figure 6 It is a schematic diagram of a speed change mechanism in the prior art.

[0025] Figure numerals: 1. tapered plunger; 2. seal; 3. steel ball; 4. swash plate one; 5. housing one; 6. spring; 7. speed regulating plunger; 8. swash plate two; 9. housing two; 10. rear flange; 11. pivot hole; 12. arc groove; 13. speed change oil circuit; 14. slot hole; 15. plunger hole; 16. cavity; 17. plunger; 18. plunger cylinder; 19. pivot. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] like Figures 1 to 5As shown, the utility model discloses a speed change mechanism of a motor, including a housing 29, a rear flange 10 is installed on the housing 29, a plunger cylinder 18 is installed in the housing 29, a plurality of plungers 17 are installed on the plunger cylinder 18, a slant plate 28 and a plunger hole 15 are provided in the housing 29, a spring 6 and a speed regulating plunger 7 are installed in the plunger hole 15, the speed regulating plunger 7 is a cylindrical structure, the shape of the plunger hole 15 is adapted to the shape of the speed regulating plunger 7, and the speed regulating plunger 7 is A spherical surface is provided at one end, and the spherical surface abuts against the swash plate 8. The other end of the swash plate 8 is connected to the plunger 17. The other end of the speed regulating plunger 7 is provided with a cavity 16. One end of the spring 6 is located in the cavity 16, and the other end abuts against the bottom wall of the plunger hole 15. The spring 6 is a compression spring. The cavity 16 limits the spring 6 and makes the spring 16 have a certain pre-tightening force, so that the speed regulating plunger 7 is always in contact with the swash plate 8 under the action of the spring 6.

[0029] The swash plate 2 8 is provided with an arc groove 12, which extends along the radial direction of the swash plate 2 8, and the spherical surface is slidably matched with the arc groove 12. The arc groove 12 is matched with the spherical surface on the speed regulating plunger 7, ensuring that the speed regulating plunger 7 drives the swash plate 2 8 to move smoothly, thereby realizing the speed changing function.

[0030] The plunger hole 15 is tilted. The plunger hole 15 is tilted so that the spherical surface of the speed regulating plunger 7 is in close contact with the arc groove 12 on the swash plate 2 8, avoiding an angle between the speed regulating plunger 7 and the swash plate 2 8, and making the spring 6 evenly apply force to the speed regulating plunger 7, reducing the eccentric wear between the speed regulating plunger 7 and the plunger hole 15, and ensuring the service life of the speed regulating plunger 7.

[0031] The speed regulating plunger 7 and the inner wall of the plunger hole 15 are matched with a small clearance, and the matching clearance is 0.02mm-0.05mm, so as to avoid the problem of unstable speed change of the swash plate 8.

[0032] The lower end of the plunger hole 15 is connected to a slot hole 14 , and the slot hole 14 is connected to a speed change oil circuit 13 , and the speed change oil circuit 13 is provided on the housing 2 9 .

[0033] The swash plate 8 is provided with two pivot holes 11, which are concave spherical surfaces. The pivot holes 11 and the arc grooves 12 are arranged on the same side of the swash plate 8. A pivot 19 is installed in the housing 9. The pivot 19 cooperates with the pivot hole 11 to support the swash plate 8 and realize the speed change of the swash plate 8 under the action of the speed regulating plunger 7.

[0034] The working process of the utility model is as follows:

[0035] When switching between the two speeds, the high-pressure oil of the rear flange 10 enters the cavity 16 of the speed regulating plunger 7 through the speed change oil circuit 13 and the slot 14. Under the combined force of the spring 6 and the high-pressure oil, the speed regulating plunger 7 moves upward along the plunger hole 15, thereby lifting the swash plate 2 8 to achieve the variable speed of the swash plate 2 8. The pivot hole 11 on the swash plate 2 8 cooperates with the pivot 19 to change the swing angle of the swash plate 2 8. Since the swash plate 2 8 is connected to the plunger 17, the movement stroke of the plunger 17 in the plunger cylinder 18 becomes shorter, the amount of oil discharged is reduced, and the speed is increased, thereby achieving motor speed change.

[0036] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A speed change mechanism of a motor, comprising a housing (9), wherein a swash plate (8) and a plunger hole (15) are provided in the housing (9), characterized in that: A spring (6) and a speed regulating plunger (7) are installed in the plunger hole (15); the speed regulating plunger (7) is of a cylindrical structure; one end of the speed regulating plunger (7) is provided with a spherical surface, the spherical surface abuts against the second swash plate (8); the other end of the speed regulating plunger (7) is provided with a cavity (16); one end of the spring (6) is located in the cavity (16), and the other end abuts against the bottom wall of the plunger hole (15).

2. The speed change mechanism of the motor according to claim 1, characterized in that: The second swash plate (8) is provided with an arc-shaped groove (12), the arc-shaped groove (12) extends along the radial direction of the second swash plate (8), and the spherical surface is slidably matched with the arc-shaped groove (12).

3. The speed change mechanism of the motor according to claim 1 or 2, characterized in that: The plunger hole (15) is arranged obliquely.

4. The speed change mechanism of the motor according to claim 3, characterized in that: The speed regulating plunger (7) and the inner wall of the plunger hole (15) are matched with each other with a small clearance.

5. The speed change mechanism of the motor according to claim 1, characterized in that: The lower end of the speed regulating plunger (7) is provided with a guiding inclined surface.

6. The speed change mechanism of the motor according to claim 1, characterized in that: The lower end of the plunger hole (15) is connected to a slot hole (14), and the slot hole (14) is connected to a speed change oil circuit (13), and the speed change oil circuit (13) is arranged in the second housing (9).

7. The speed change mechanism of the motor according to claim 1, characterized in that: The second swash plate (8) is provided with a pivot hole (11), and the end of the pivot hole (11) is in the form of a concave spherical surface.

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