Structure capable of improving friction stability of ZD6 point switch speed reducer

Abstract

The invention relates to a structure capable of improving friction stability of a speed reducer of a ZD6 point switch, which comprises a speed reduction shell (1), an internal gear (2) and an output shaft (3), the internal gear (2) is of a hollow step shaft-shaped structure, teeth are arranged in an inner hole at the large end of the internal gear (2), the teeth are in meshing transmission with an external gear (9) in the hole, an inner hole at the small end of the internal gear (2) is a bearing hole and is centered by a rolling bearing, and the output shaft (3) is arranged in the bearing hole. The speed reducer is characterized in that a bearing (6) is arranged between the outer side of the large end of the internal gear (2) and the inner side of the corresponding part of the speed reducing shell (1), the outer side of the large end of the internal gear (2) is tightly matched with the inner side of the corresponding part of the speed reducing shell (1) through the bearing (6), and the large end and the small end of the internal gear (2) are tightly positioned by the bearing in the circumferential direction. According to the actual situation of the integrated structure of the speed reducer and the friction coupler, the stability of friction current is improved by improving the rotation stability of the inner gear when the speed reducer is in friction (the friction coupler is in a slipping state).

Description

Technical Field

[0001] The invention relates to an electric switch machine, in particular to a structure capable of improving the friction stability of a reducer of a ZD6 switch machine. Background Art

[0002] The electric switch machine needs to adjust and set the maximum output force of the action rod through the friction coupling to ensure the conversion system parameters such as the close contact force and 4mm non-locking, and protect the motor when a conversion failure occurs.

[0003] The stability of the friction conversion force of the friction coupling affects the reliability of the switch switching. For example, in the field application of the ZD6 switch machine, the friction conversion force (friction current) increases abnormally, resulting in mechanical rebound, and the phenomenon of disconnection after the circuit is connected. When the friction conversion force (friction current) becomes smaller, the switch may not be able to complete the conversion. Therefore, the inspection and adjustment of the friction conversion force (friction current) is an important part of the daily maintenance of the electric switch machine. For the ZD6 switch machine, the friction current can be used to reflect the friction conversion force.

[0004] In order to improve the friction current stability of the ZD6 switch machine, practitioners have conducted a lot of research work, made certain improvements in friction materials, friction structures, etc., and achieved certain results, but it still cannot meet the needs of on-site applications and still needs further improvement.

[0005] Figure 1 A ZD6 switch machine reducer with an integrated drum friction structure is given. In this structure, the internal gear 2 in the planetary reduction transmission mechanism extends out of the reduction housing 1 and is clamped and fixed by the friction belt installed on the left clamping plate 4 and the right clamping plate 5. The clamping force is adjusted by a spring. When the friction force generated by the clamping force prevents the internal gear 2 from rotating, the output shaft 3 of the reducer rotates to drive the subsequent parts. When the friction force generated by the clamping force cannot prevent the internal gear 2 from rotating, the friction coupling is in a slipping state, the internal gear 2 rotates, and the output shaft 3 of the reducer cannot rotate and cannot drive the subsequent parts. At this time, the ZD6 reducer is defined as a friction state. At this time, the working current value of the motor is the friction current value, and the force value measured on the actuating rod along the moving direction of the actuating rod is the friction conversion force value, referred to as friction force.

[0006] Figure 2 A ZD6 switch machine reducer with an integrated disc friction structure is provided, which stacks inner friction plates 7 and outer friction plates 8 axially and compresses them with springs to generate friction between their contact surfaces, wherein the inner friction plates 7 and inner gears 2 are nested, and the outer friction plates 8 and reduction housing 1 are nested, or the inner friction plates 7 and reduction housing 1 are nested, and the outer friction plates 8 and inner gears 2 are nested, and the inner friction plates 7 and outer friction plates 8 are enclosed in a cavity to reduce the influence of the external environment on the friction surfaces.

[0007] Figure 1 The structure is the initial design. In order to improve the friction stability during use, the friction belt material has been improved several times. The asbestos rubber friction belt that produces hazardous waste, has a low friction life and is easy to absorb moisture has been eliminated. However, the resin-based friction belt and copper-based powder metallurgy friction belt currently used cannot meet the on-site requirements for the stability of friction current (friction force).

[0008] Figure 2 The structure is for Figure 1 The friction surface in the structure is open and easily affected by the environment, so the friction material is protected in a closed cavity and isolated from the external environment, which reduces the impact of pollution, water vapor, oil, etc. on the friction surface, and has a positive significance for improving friction stability. However, during assembly, debugging and actual use, there are still cases where the friction stability is poor and it is difficult to meet the use requirements.

[0009] It can be seen that the existing ZD6 switch machine reducer with integrated friction coupling has the problems of friction stability that cannot meet the requirements, large maintenance workload, poor high and low temperature stability, and difficulty in meeting the environmental influences such as temperature, humidity, and pollutants during the use cycle. Even after the sealing is improved, the friction stability still cannot fully meet the use requirements.

[0010] The reason is that when the reducer rubs (friction coupling slips), the internal gear 2 rotates relative to the reduction housing 1 driven by the external gear. In the reducer structure, a small gap is designed between the contact surfaces of the two to accommodate the slight radial swing of the internal gear 2 caused by the gear meshing force during the rotation of the internal gear 2, and to prevent the local contact force generated by the swing during the rotation process from being too large, causing problems such as scratches, bites, and tears. However, this swing causes a large change in the meshing of the gears, and the transmission of the reducer is unstable, so that during the friction of the reducer, the working current of the motor is unstable.

[0011] It can be seen that various improvements are simply based on the friction coupling structure or material, without fully considering the actual situation that the internal gear 2 has two working states in the integrated structure of the reducer and friction coupling, and cannot fundamentally change the unstable working current of the motor in the friction state. Summary of the invention

[0012] In view of the defects of the existing technical solutions, the present invention starts from the actual situation of the integrated structure of the reducer and the friction coupling, and improves the stability of the friction current by improving the stability of the internal gear rotation when the reducer friction (the friction coupling is in a slipping state).

[0013] The technical scheme of the present invention is: it relates to a structure capable of improving the friction stability of the ZD6 switch machine reducer, comprising: a reduction housing, an internal gear and an output shaft, the internal gear is a hollow stepped shaft structure, the inner hole of the large end of the internal gear has teeth, the teeth mesh with the external gear in the hole for transmission, the inner hole of the small end of the internal gear is a bearing hole, and the centering is carried out by a rolling bearing, and the characteristics are: a bearing is installed between the outer side of the large end of the internal gear and the inner side of the corresponding part of the reduction housing, the outer side of the large end of the internal gear and the inner side of the corresponding part of the reduction housing are closely matched through the bearing, and the large end and the small end of the internal gear are closely positioned by the bearing in the circumferential direction; When the internal gear is stationary relative to the reduction housing, the output shaft rotates and the reducer is in a normal transmission state; When the internal gear rotates relative to the reduction housing, the output shaft is stationary and the reducer is in a friction state. It is restricted by the bearing between the outer side of the large end of the internal gear and the inner side of the corresponding part of the reduction housing, and the rolling bearing inside the small end of the internal gear. When the internal gear rotates relative to the reduction housing, the swing of the internal gear around the rotation axis is less than 0.02mm.

[0014] When the internal gear is stationary relative to the reduction housing, the internal gear and the reduction housing are closely matched through the bearing, so that the torque transmitted by the internal gear is less than the set torque of the friction coupling, the internal gear does not rotate, the output shaft rotates, and the reducer is in a normal transmission state; When the internal gear rotates relative to the reduction housing; when the torque transmitted by the internal gear is greater than the set torque of the friction coupling, the internal gear rotates, the reducer is in a friction state, causing the output shaft to be blocked and the output shaft to be stationary.

[0015] The bearing is a sliding bearing, which is fixed in a hole in the reduction housing for accommodating the large end of the internal gear.

[0016] The bearing is a bushing, a first circumferential groove is arranged in the hole for accommodating the big end of the internal gear in the reduction housing, and the bushing is installed in the first circumferential groove of the reduction housing.

[0017] The bearing or bushing has a second circumferential groove on the outer periphery of the big end of the internal gear, and the bushing is installed in the second circumferential groove on the big end of the internal gear.

[0018] The bearing is a rolling bearing, the outer ring of the rolling bearing is tightly matched and fixed with the hole in the reduction housing that accommodates the large end of the internal gear, and the inner ring of the bearing is tightly matched with the large end of the internal gear.

[0019] The advantages of the present invention are as follows: compared with the prior art, the present invention changes the original structure of supporting one end of the internal gear to supporting both ends, thereby eliminating the gap between the internal gear and the reduction housing in the reducer structure and enhancing the stability of the internal gear when rotating.

[0020] When the friction coupling slips, the internal gear and the external gear in the reducer structure continue to mesh and transmit, and the meshing force will cause the internal gear to deform at the meshing point and the rotation axis to wobble. In the original structure, since the internal gear is not tightly fixed at the meshing point with the external gear, the large end of the internal gear will wobble greatly during rotation, the meshing of the internal gear and the external gear will deteriorate, and the friction between the outer periphery of the internal gear and the reduction housing will also change, resulting in changes in the transmission of the reducer. Ultimately, in this state, the working current of the motor will be unstable, that is, the friction current will be unstable.

[0021] In the improved structure, the large end of the internal gear is tightly fixed by the bearing, the friction force changes little during its rotation, and the rotation axis is stable. The meshing of the internal gear and the external gear is stable with little change, so the working current of the motor is relatively stable, that is, the friction current is relatively stable.

[0022] The present invention will be further described below in conjunction with the embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the structural diagram of the existing ZD6 switch machine reducer with integrated drum friction structure; Figure 2 This is the structural diagram of the existing ZD6 switch machine reducer with integrated disc friction structure; Figure 3 It is a structural diagram of embodiment 1 of the present invention; Figure 4 It is a structural diagram of embodiment 2 of the present invention; Figure 5 It is a structural diagram of embodiment 3 of the present invention; Figure 6 It is a structural diagram of embodiment 4 of the present invention; Figure 7 is a structural diagram of embodiment 5 of the present invention; Figure 8 It is a structural diagram of embodiment 6 of the present invention; Fig. 9 is a structural diagram of embodiment 7 of the present invention; Fig.10 It is a structural diagram of implementation scheme 8 of the present invention.

[0024] In the figure, 1, reduction housing; 2, internal gear; 3, reducer output shaft; 4, left clamping plate; 5, right clamping plate; 6, bearing; 7, inner friction plate; 8, outer friction plate; 9, outer gear; 10, rotation axis; 11, first circumferential groove; 12, second circumferential groove; 13, outer ring of rolling bearing. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and methods adopted by the present invention to achieve the predetermined purpose, the specific implementation methods, structural features and methods of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. Example 1

[0026] like Figure 3 As shown, the present invention relates to a structure capable of improving the friction stability of a ZD6 switch machine reducer, which is implemented in a ZD6 switch machine reducer with an existing integrated drum friction structure, and relates to a structure capable of improving the friction stability of a ZD6 switch machine reducer, comprising: a reduction housing 1, an internal gear 2 and an output shaft 3, wherein the internal gear 2 is a hollow step shaft structure, the inner hole at the large end of the internal gear 2 is provided with teeth, the teeth mesh with an external gear 9 in the hole for transmission, the inner hole at the small end of the internal gear 2 is a bearing hole, and is centered by a rolling bearing, and is characterized in that: a bearing 6 is installed between the outer side of the large end of the internal gear 2 and the inner side of the corresponding part of the reduction housing 1, the outer side of the large end of the internal gear 2 and the inner side of the corresponding part of the reduction housing 1 are tightly matched through the bearing 6, and the large end and the small end of the internal gear 2 are tightly positioned by the bearing in the circumferential direction; When the internal gear 2 is stationary relative to the reduction housing 1, the output shaft 3 rotates, and the reducer is in a normal transmission state; When the internal gear 2 rotates relative to the reduction housing 1, the output shaft 3 is stationary, and the reducer is in a friction state. It is restricted by the bearing 6 between the outer side of the large end of the internal gear 2 and the inner side of the corresponding part of the reduction housing 1, and the rolling bearing inside the small end of the internal gear 2. When the internal gear 2 rotates relative to the reduction housing 1, the swing of the internal gear 2 around the rotating axis 10 is less than 0.02mm.

[0027] When the internal gear 2 is stationary relative to the reduction housing 1, the internal gear 2 and the reduction housing 1 are closely matched through the bearing 6, so that the torque transmitted by the internal gear 2 is less than the set torque of the friction coupling, the internal gear 2 does not rotate, the output shaft 3 rotates, and the reducer is in a normal transmission state; When the internal gear 2 rotates relative to the reduction housing 1; when the torque transmitted by the internal gear 2 is greater than the set torque of the friction coupling, the internal gear 2 rotates, the reducer is in a friction state, the output shaft 3 is blocked, and the output shaft 3 is stationary. Example 2

[0028] like Figure 4 As shown, the present invention relates to a structure capable of improving the friction stability of a ZD6 switch machine reducer, which is implemented in a ZD6 switch machine reducer with an existing integrated disc friction structure. Implementation structure 2 is the same as implementation example 1, the only difference being that a drum friction structure replaces a disc friction structure. Example 3

[0029] like Figure 5As shown, the present invention relates to a structure that can improve the friction stability of the ZD6 switch machine reducer, which is implemented in the ZD6 switch machine reducer with an integrated drum friction structure, and is characterized in that the bearing 6 is a bearing shell, and there is a circumferential groove in the hole of the reduction housing 1 that accommodates the internal gear 2, and the bearing 6 is installed in the circumferential groove of the reduction housing 1. The rest is the same as Example 1 and will not be described in detail. Example 4

[0030] like Figure 6 As shown, the present invention relates to a structure that can improve the friction stability of the ZD6 switch machine reducer. It is implemented in the ZD6 switch machine reducer with an integrated disc friction structure, and is characterized in that the bearing 6 is a bearing shell, and there is a first circumferential groove 11 in the hole of the reduction housing 1 for accommodating the big end of the internal gear, and the bearing 6 is installed in the first circumferential groove 11 of the reduction housing 1. The rest is the same as Example 1 and will not be described in detail. Example 5

[0031] like Figure 7 As shown, the present invention relates to a structure capable of improving the friction stability of a ZD6 switch machine reducer, which is implemented in a ZD6 switch machine reducer with an integrated drum friction structure, and is characterized in that the bearing 6 is a bearing shell, a circumferential groove is provided on the outer periphery of the large end of the internal gear 2, and the bearing 6 is installed in the second circumferential groove 12 of the large end of the internal gear 2. The rest is the same as in Example 1 and will not be described in detail. Example 6

[0032] like Figure 8 As shown, the present invention relates to a structure that can improve the friction stability of the ZD6 switch machine reducer. It is implemented in the existing ZD6 switch machine reducer with an integrated disc friction structure. A further change is that the bearing 6 or the bushing, the outer periphery of the large end of the internal gear 2 or there is a second circumferential groove 12, the bushing is installed in the second circumferential groove 12 of the large end of the internal gear 2, and the rest is the same as Example 2 and will not be described in detail. Example 7

[0033] like Fig. 9 As shown, the present invention relates to a structure capable of improving the friction stability of a ZD6 switch machine reducer, which is implemented in a ZD6 switch machine reducer with an existing integrated drum friction structure, comprising: a reduction housing 1, an internal gear 2, a bearing 6 and an output shaft 3, wherein the bearing 6 is a rolling bearing, the outer ring of the bearing 6 is tightly fitted and fixed to the hole in the reduction housing 1 for accommodating the large end of the internal gear, the inner ring of the bearing 6 is tightly fitted to the large end of the internal gear 2, and the rest is the same as in Example 1 and will not be described in detail. Example 8

[0034] like Fig.10As shown, the present invention relates to a structure that can improve the friction stability of the ZD6 switch machine reducer. It is implemented in the existing ZD6 switch machine reducer with an integrated disc friction structure. Further, the bearing 6 is a rolling bearing, and the outer ring 13 of the rolling bearing is tightly matched and fixed with the hole in the reduction housing 1 that accommodates the internal gear 2, and the inner ring of the bearing 6 is tightly matched with the large end of the internal gear 2. The rest is the same as Example 2 and will not be described in detail.

[0035] The present invention fully considers the actual situation that the internal gear 2 has two working states in the integrated structure of the reducer and the friction coupling, and thus can fundamentally change the situation that the motor working current is unstable when in the friction state.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any changes, substitutions or improvements made to the structures and features described in the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure capable of improving the friction stability of a ZD6 switch machine reducer, comprising: A reduction housing (1), an internal gear (2) and an output shaft (3), wherein the internal gear (2) is a hollow stepped shaft structure, the inner hole of the large end of the internal gear (2) is provided with teeth, the teeth meshing with the external gear (9) in the hole for transmission, the inner hole of the small end of the internal gear (2) is a bearing hole, and is centered by a rolling bearing, wherein a bearing (6) is installed between the outer side of the large end of the internal gear (2) and the inner side of the corresponding part of the reduction housing (1), the outer side of the large end of the internal gear (2) and the inner side of the corresponding part of the reduction housing (1) are tightly matched through the bearing (6), and the large end and the small end of the internal gear (2) are tightly positioned by the bearing in the circumferential direction; When the internal gear (2) is stationary relative to the reduction housing (1), the output shaft (3) rotates, and the reducer is in a normal transmission state; When the internal gear (2) rotates relative to the reduction housing (1), the output shaft (3) is stationary, and the reducer is in a friction state. It is restricted by the bearing (6) between the outer side of the large end of the internal gear (2) and the inner side of the corresponding part of the reduction housing (1), and the rolling bearing inside the small end of the internal gear (2). When the internal gear (2) rotates relative to the reduction housing (1), the swing of the internal gear (2) around the rotation axis (10) is less than 0.02 mm.

2. The structure for improving the friction stability of the ZD6 switch reducer according to claim 1 is characterized in that: The bearing (6) is a sliding bearing, which is fixed in a hole in the reduction housing (1) that accommodates the large end of the internal gear (2).

3. The structure for improving the friction stability of the ZD6 switch machine reducer according to claim 1 is characterized in that: The bearing (6) is a bearing bush, and a first circumferential groove (11) is provided in a hole in the reduction housing (1) for accommodating the internal gear (2), and the bearing bush is installed in the first circumferential groove (11) of the reduction housing (1).

4. The structure for improving the friction stability of the ZD6 switch reducer according to claim 1 is characterized in that: The bearing (6) is a bushing, and the outer periphery of the large end of the internal gear (2) may have a second circumferential groove (12), and the bushing is installed in the second circumferential groove (12) of the large end of the internal gear (2).

5. The structure for improving the friction stability of the ZD6 switch reducer according to claim 1 is characterized in that: The bearing (6) is a rolling bearing. The outer ring (13) of the rolling bearing is tightly matched with and fixed to the hole in the reduction housing (1) for accommodating the internal gear (2). The inner ring of the bearing (6) is tightly matched with the large end of the internal gear (2).

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