CN217355292U - Internal push trigger type spring clutch - Google Patents

Abstract

In order to solve the problems that the friction clutch in the prior art has a complex structure and high manufacturing cost, and the process of connecting or disconnecting power is not easy to control, the utility model provides an internal push trigger type spring clutch, which comprises an inner shaft, an outer shaft, a bearing, a trigger mechanism and a resistance spring; the inner shaft is a hollow shaft, and the large half section on the right side of the inner shaft is a hollow section; the outer shaft is sleeved on the outer circle of the inner shaft; the trigger mechanism is arranged at the hollow section of the inner shaft; the resistance spring is a close-packed spring wound anticlockwise and is installed between the inner shaft annular boss and the trigger ring. The utility model discloses the beneficial technological effect of internal-pushing trigger spring clutch is simple structure, and manufacturing cost is lower to, the process of joint or break-off power is all comparatively steady and controllable.

Description

Internal push trigger type spring clutch

Technical Field

The utility model relates to a mechanical drive clutch technique, in particular to internal pushing trigger type spring clutch.

Background

The clutch is an important part indispensable in mechanical transmission, and the main functions of the clutch are power transmission and power cut-off. The clutch is similar to a switch, and the power transmission action is engaged or disengaged, the driving part and the driven part of the clutch mechanism can be temporarily separated and can be gradually engaged, and relative rotation is possible in the transmission process. The driving part and the driven part of the clutch can not adopt rigid connection. Among the various clutches, the friction clutch should be the most widely used and the most long-standing type. The most basic components of such clutches are friction plates and friction plates (also referred to as pressure plates), with the disengagement and engagement of the friction plates and friction plates effecting the disconnection and transmission of power. The friction clutch mainly comprises a driving part, a driven part, a pressing mechanism and an operating mechanism. The driving part, the driven part and the pressing mechanism are basic structures for ensuring that the clutch is in an engaged state and can transmit power, and the operating mechanism of the clutch is mainly a device for separating the clutch. In the process of separation, a clutch pedal is stepped, the free clearance of the clutch is firstly eliminated in the free stroke, then the separation clearance is generated in the working stroke, and the clutch is separated. During engagement, the clutch pedal is gradually released, the pressure plate moves forward under the action of the compression spring, the separation gap is firstly eliminated, and sufficient compression force acts on the pressure plate, the driven plate and the flywheel working surface; the release bearing then moves backwards under the action of the return spring, creating a free gap and the clutch engages. In order to ensure that sufficient pressing force acts on the working surfaces of the pressure plate, the driven plate and the flywheel, a preset pressure mode and the like are generally adopted, so that when the pressure plate, the driven plate and the flywheel are combined, the preset pressure acts on the working surfaces of the pressure plate, the driven plate and the flywheel. Therefore, the structure of the prior art friction clutch is complex, the manufacturing cost is high, and the process of connecting or disconnecting power is not easy to control.

Obviously, the friction clutch in the prior art has the problems of complex structure, high manufacturing cost, difficulty in controlling the process of engaging or disengaging power and the like.

Disclosure of Invention

The structure that exists for solving prior art friction clutch is comparatively complicated, and manufacturing cost is higher to, the difficult control scheduling problem still of process of joint or break-off power, the utility model provides an internal-pushing trigger formula spring clutch.

The utility model discloses an internal push trigger type spring clutch, which comprises an inner shaft, an outer shaft, a bearing, a trigger mechanism and a resistance spring; the inner shaft is a hollow shaft, and the large half section on the right side of the inner shaft is a hollow section; steps for mounting bearings are arranged at two ends of the inner shaft, annular bosses are respectively arranged at two ends of the middle section of the inner shaft, and rectangular through holes with the width same as that of the cross section of the top plate and the length twice of that of the cross section of the top plate are radially arranged at the inner side of the right end of the middle section of the inner shaft; the outer shaft is sleeved on the excircle of the inner shaft, and two ends of the outer shaft are fixed on the inner shaft through bearings respectively; the bearing is arranged at two ends of the inner shaft and the outer shaft and is used as a support between the inner shaft and the outer shaft; the trigger mechanism is arranged on the hollow section of the inner shaft and comprises a return spring, a top column, a trigger ring, a top plate, a flat plate bearing, a push rod and an electric screw rod; the reset spring, the top column, the flat plate bearing and the push rod are sequentially arranged on the inner shaft hollow section from left to right, and the outer circles of the reset spring, the top column, the flat plate bearing and the push rod are in sliding fit with the inner circle of the inner shaft hollow section; the top column is radially provided with a rectangular through hole of which the shape and size are in interference fit with the cross section of the top plate, the top plate is a long strip plate of which the cross section is rectangular, and the top column is inserted into the rectangular through hole of the top column from the rectangular through hole of the inner shaft after being placed below the rectangular through hole of the hollow section of the inner shaft and is fixed in the middle position of the top column in the radial direction; the trigger ring is sleeved on the outer circle of the middle section of the inner shaft and is fixedly connected with the inner side surface of the top plate; the electric screw rod is sleeved at the tail end of the outer side of the push rod, and the push rod and the electric screw rod do not rotate along with the inner shaft; the electric screw rod pushes the push rod to move leftwards, and the trigger ring is pushed to move leftwards through the top plate; the resistance spring is the close packing type spring of anticlockwise coiling, installs between interior axle annular boss and trigger ring, and the internal diameter and the external diameter of resistance spring respectively with interior axle excircle and outer interior round sliding fit of axle, the medial surface of the left annular boss in interior axle middle section is fixed to the left end of resistance spring.

Furthermore, the outer shaft is of a two-section structure, the two sections of outer shafts are sleeved on the outer circle of the inner shaft, and the outer ends of the two sections of outer shafts are fixed on the inner shaft through bearings respectively; in addition, the left end of the resistance spring is fixed on the inner side surface of the annular boss on the left side of the middle section of the inner shaft or the left end of the inner wall of the outer shaft on the left section.

Further, the top plate is arranged in the axial middle of the inner shaft; the two trigger rings are respectively arranged on the left side and the right side of the top plate; the two resistance springs are respectively sleeved between the left and right two sections of outer shafts and the inner shaft, and the outer ends of the two resistance springs are respectively fixed on the inner side surfaces of the annular bosses on the outer sides of the left and right two sections of outer shafts; and the electric screw rod can position the push rod at the middle position between the two resistance springs, push the push rod to move towards the left resistance spring and push the push rod to move towards the right resistance spring.

Furthermore, two ends of the resistance spring are respectively welded with a bearing ring, the bearing rings are circular rings with rectangular cross sections, and the inner diameters and the outer diameters of the bearing rings are respectively matched with the inner diameters and the outer diameters of the resistance spring.

Furthermore, the number of the resistance springs is two, the thread pitch of the resistance springs is larger than the diameter of the steel wire for winding the resistance springs, and the resistance springs are arranged on the circumference in an angle of 180 degrees.

Furthermore, the number of the resistance springs is three, the thread pitch of the resistance springs is larger than the diameter of two times of the steel wire for winding the resistance springs, and the resistance springs are arranged at 120 degrees on the circumference.

Furthermore, the cross section of the wound steel wire of the resistance spring is rectangular.

Furthermore, the total fit clearance between the inner circle of the resistance spring and the outer circle of the inner shaft is less than 0.10mm, and the total fit clearance between the outer circle of the resistance spring and the inner circle of the outer shaft is 0.20 mm-0.50 mm.

Furthermore, the resistance spring is a structure with high size progress and high surface finish degree, and the inner circle and the outer circle of the resistance spring are both ground.

The utility model discloses the beneficial technological effect of internal-pushing trigger spring clutch is simple structure, and manufacturing cost is lower to, the process of joint or break-off power is all comparatively steady and controllable.

Drawings

FIG. 1 is a three-dimensional schematic view of the outer appearance of an embodiment 1 of the internal-pushing trigger spring clutch of the present invention;

fig. 2 is a schematic sectional view of embodiment 1 of the present invention;

fig. 3 is an exploded three-dimensional schematic view of the triggering mechanism of embodiment 1 of the present invention;

fig. 4 is a schematic cross-sectional view of embodiment 2 of the internal-push-trigger spring clutch of the present invention;

fig. 5 is a schematic cross-sectional view of embodiment 3 of the internal-push-trigger spring clutch of the present invention;

FIG. 6 is a three-dimensional schematic view of the resistance spring welded with a bearing ring;

FIG. 7 is a three-dimensional schematic diagram of two resistance springs according to the present invention;

fig. 8 is a three-dimensional schematic view of the resistance spring of the present invention;

FIG. 9 is a schematic cross-sectional view of a resistance spring wound steel wire of the present invention with a rectangular cross-sectional shape;

fig. 10 is a three-dimensional schematic view of the resistance spring with its inner and outer circles both ground.

The internal-push-trigger spring clutch of the present invention will be further described with reference to the accompanying drawings and the following detailed description.

Detailed Description

Example 1

Fig. 1 is an external three-dimensional schematic view of an embodiment 1 of the internal-push trigger spring clutch of the present invention, fig. 2 is a sectional schematic view of embodiment 1 of the present invention, and fig. 3 is an exploded three-dimensional schematic view of a trigger mechanism of embodiment 1 of the present invention; in the figure, 1 is an inner shaft, 2 is an outer shaft, 3 is a bearing, 4 is a trigger mechanism, 4-1 is a return spring, 4-2 is a support pillar, 4-3 is a trigger ring, 4-4 is a top plate, 4-5 is a flat bearing, 4-6 is a push rod, 4-7 is an electric screw rod, and 5 is a resistance spring. As can be seen from the figure, the internal push trigger spring clutch of the present invention comprises an inner shaft 1, an outer shaft 2, a bearing 3, a trigger mechanism 4 and a resistance spring 5; the inner shaft 1 is a hollow shaft, and the large half section on the right side of the inner shaft is a hollow section; steps for mounting bearings are arranged at two ends of the inner shaft, annular bosses are respectively arranged at two ends of the middle section of the inner shaft, and rectangular through holes with the width same as that of the cross section of the top plate and the length twice of that of the cross section of the top plate are radially arranged at the inner side of the right end of the middle section of the inner shaft; the outer shaft 2 is sleeved on the outer circle of the inner shaft, and two ends of the outer shaft are fixed on the inner shaft through bearings respectively; the bearing 3 is arranged at two ends of the inner shaft and the outer shaft and is used as a support between the inner shaft and the outer shaft; the trigger mechanism 4 is arranged on the hollow section of the inner shaft and comprises a return spring 4-1, a top column 4-2, a trigger ring 4-3, a top plate 4-4, a flat bearing 4-5, a push rod 4-6 and an electric screw rod 4-7; the reset spring 4-1, the top column 4-2, the flat plate bearing 4-5 and the push rod 4-6 are sequentially arranged on the inner shaft hollow section from left to right, and the outer circles of the reset spring 4-1, the top column 4-2, the flat plate bearing 4-5 and the push rod 4-6 are in sliding fit with the inner circle of the inner shaft hollow section; the top column 4-2 is radially provided with a rectangular through hole of which the shape and size are in interference fit with the cross section of the top plate, the top plate 4-4 is a long strip-shaped plate of which the cross section is rectangular, and after the top column is placed below the rectangular through hole of the hollow section of the inner shaft, the top column is inserted into the rectangular through hole of the top column from the rectangular through hole of the inner shaft and is fixed at the radial middle position of the top column; the trigger ring 4-3 is sleeved on the outer circle of the middle section of the inner shaft and is fixedly connected with the inner side surface of the top plate; the electric screw rod 4-7 is sleeved at the tail end of the outer side of the push rod 4-6, and the push rod and the electric screw rod do not rotate along with the inner shaft; the electric screw rod pushes the push rod to move leftwards, and the trigger ring is pushed to move leftwards through the top plate; resistance spring 5 is the close packing type spring of anticlockwise coiling, installs between interior axle annular boss and trigger ring, and the internal diameter and the external diameter of resistance spring respectively with interior axle excircle and outer interior round sliding fit of axle, the medial surface of the left annular boss in interior axle middle section is fixed to the left end of resistance spring. In the present invention, in embodiment 1 of the internal push trigger spring clutch, the inner shaft is a driving shaft, and the outer shaft is a driven shaft. When the electric screw rod is not opened, the trigger ring moves rightwards along with the top plate under the action of the return spring, no action is generated on the resistance spring, the rotation of the inner shaft is independent relative to the outer shaft, and the reverse is also the same. At the moment, the driving shaft and the driven shaft are in a separated state, and both the driving shaft and the driven shaft can rotate relatively without any power transmission. Under the condition of driving shaft clockwise turning (under the condition of power transmission promptly), open electronic lead screw, electronic lead screw promotes the push rod and overcomes reset spring's elastic force and removes left to promote to trigger the ring through the roof and remove left, make and trigger ring left surface and resistance spring right side end face contact, thereby prevent that the resistance spring is rotatory along with interior axle (being the driving shaft). Therefore, the resistance spring is in a clockwise twisting state, the resistance spring generates a radial expansion under the condition that the left side and the right side of the resistance spring twist against the self-rotating direction, the outer wall of the resistance spring is propped against the inner wall of the driven shaft, and namely the resistance spring is in the radial expansion and pressing process. Because the resistance spring is in sliding fit with the driven shaft, the clearance is small, and the resistance spring is completely tensioned and pressed on the inner wall of the driven shaft after the diameter of the resistance spring is expanded ring by ring, so that the driven shaft and the driving shaft are driven to rotate clockwise. At the moment, the driving shaft and the driven shaft are pressed against the inner wall of the driven shaft by the whole expansion of the resistance spring to form friction force transmission torque, so that large torque load can be borne. In addition, under the condition that most of the torque of the resistance spring is transmitted to the driven shaft, the torque borne by the trigger ring is relatively small, and the top plate can fully bear the torque. When the electric screw rod stops working, the reset spring pushes the top plate to move rightwards, the trigger ring leaves the resistance spring, the resistance spring recovers free rotation, and power transmission is separated. The utility model discloses the less moment that the internal-pushing triggered spring clutch bore in order to trigger the ring realizes the control of great power transmission between driving shaft and the driven shaft for the process of joint or breaking away from power is all comparatively steady and controllable. And the triggering of the resistance spring actually stops the rotation of the movable end of the resistance spring, so that the structure of the whole clutch is simpler, and the manufacturing cost is greatly reduced. Because utility model will trigger the mechanism for pass the structure and set up in the inner shaft sky, consequently, call it as interior push trigger formula spring clutch.

Example 2

Fig. 4 is a schematic cross-sectional view of embodiment 2 of the internal-pushing spring-actuated clutch of the present invention, in which 1 is an inner shaft, 2-1 is an outer shaft i, 2-2 is an outer shaft ii, 3 is a bearing, 4 is a trigger mechanism, and 5 is a resistance spring. As can be seen from the figure, in the embodiment 2 of the internal push trigger spring clutch of the present invention, the outer shaft has a two-stage structure, the two-stage outer shaft is sleeved on the outer circle of the inner shaft, and the outer ends of the two-stage outer shaft are fixed on the inner shaft through bearings respectively; in addition, the left end of the resistance spring is fixed on the inner side surface of the annular boss on the left side of the middle section of the inner shaft or the left end of the inner wall of the outer shaft on the left section. In the embodiment 2, the outer shaft in the embodiment 1 is divided into two sections from the middle, namely an outer shaft I and an outer shaft II; meanwhile, the right end of the resistance spring is fixed on the inner side surface of the annular boss on the right side of the middle section of the inner shaft or the left end of the inner wall of the outer shaft on the left section; the rest are the same as in example 1. In the embodiment 2, after the outer shaft is divided into two sections, more power transmission modes can be realized. For example: when the left end head of the resistance spring is fixed on the inner side surface of the annular boss on the left side of the middle section of the inner shaft, the inner shaft can be used as a driving shaft, and the outer shaft I and the outer shaft II can be respectively used as a driven shaft I and a driven shaft II and are respectively connected with different mechanisms. Under the condition that the driving shaft rotates clockwise, the electric screw rod is opened, the top plate pushes the trigger ring to move leftwards, and the clockwise rotation of the resistance spring is prevented; the resistance spring will be in and expand footpath and support the process of pressing for driven shaft I and driven shaft II rotate along with the driving shaft is together, because driven shaft I and driven shaft II are connected with different mechanisms respectively, can realize different operations. And the following steps: when the left end of the resistance spring is fixed at the left end of the inner wall of the left section outer shaft, the outer shaft II is used as a driving shaft, and the outer shaft I is used as a driven shaft. When the outer shaft II rotates clockwise, the resistance spring is driven to rotate clockwise; at the moment, the electric screw rod is started, and the top plate pushes the trigger ring to move leftwards, so that the clockwise rotation of the resistance spring is prevented; the resistance spring is in the process of expanding and pressing, so that the outer shaft II and the outer shaft I rotate together, namely, the driving shaft and the driven shaft rotate together, and power transmission is realized. In this case, the inner shaft does not rotate, and can be used as a fixed shaft as a base for mounting and positioning the clutch, thereby further simplifying the overall structure.

Example 3

Fig. 5 is a schematic cross-sectional view of embodiment 3 of the internal-pushing spring clutch of the present invention, in which 1 is an inner shaft, 2-1 is an outer shaft i, 2-2 is an outer shaft ii, 3 is a bearing, 4 is a trigger mechanism, 4-3-1 is a trigger ring i, 4-3-2 is a trigger ring ii, 5-1 is a resistance spring i, and 5-2 is a resistance spring ii. As can be seen from the figure, the embodiment 3 of the spring clutch of the internal push-trigger type of the present invention is a further modification on the basis of the embodiment 2, including that the top plate 4-4 is disposed in the axial middle of the inner shaft 1; the two trigger rings 4-3 are respectively arranged on the left side and the right side of the top plate; the two resistance springs 5 are respectively sleeved between the left and right two sections of outer shafts and the inner shaft, and the outer ends of the two resistance springs are respectively fixed on the inner side surfaces of the annular bosses on the outer sides of the left and right two sections of outer shafts; and the electric screw rod can position the push rod at the middle position between the two resistance springs, push the push rod to move towards the left resistance spring and push the push rod to move towards the right resistance spring. The embodiment 3 of the utility model is cut apart into outer axle I and outer axle II at the outer axle, also cut apart into resistance spring I and resistance spring II with the resistance spring, has formed two sets of clutching mechanism under the control of a trigger mechanism, and in this embodiment 3, interior axle is the driving shaft, and outer axle I and outer axle II are driven shaft I and driven shaft II respectively, and driven shaft I and driven shaft II are connected with different mechanisms respectively, and resistance spring I and resistance spring II then correspond driven shaft I and driven shaft II respectively. Under the condition that the driving shaft rotates clockwise, when the push rod is positioned at the middle position between the two resistance springs by the electric screw rod, the triggering ring I and the triggering ring II are not in contact with the resistance springs, and the inner shaft is in a free idle state; when the electric screw rod pushes the push rod to move towards the left resistance spring, the trigger ring I prevents the resistance spring I from rotating clockwise; the resistance spring I is in the process of expanding and pressing, so that the driven shaft I rotates along with the driving shaft; namely, the driving shaft and the driven shaft I realize power transmission; when the electric screw rod pushes the push rod to move towards the right resistance spring, the trigger ring II prevents the resistance spring II from rotating clockwise; the resistance spring II is in the process of expanding diameter and resisting pressure, so that the driven shaft II rotates along with the driving shaft; namely, the driving shaft and the driven shaft II realize power transmission. Because driven shaft I and driven shaft II are connected with different mechanisms respectively, can realize different operations. Obviously, the best corresponding structure of this embodiment 3 is the transmission of the electric vehicle, that is, three operating states of the electric screw rod opening one set, the electric screw rod opening two sets and the electric screw rod not opening correspond to the neutral gear, the low gear and the high gear of the electric vehicle, respectively.

Fig. 6 is a three-dimensional schematic view of the resistance spring welded with the bearing ring of the present invention, wherein 5 is the resistance spring and a is the bearing ring. According to the drawing, in order to improve the stress distribution of the resistance spring and improve the size precision of the installation of the resistance spring, two ends of the resistance spring are respectively welded with a bearing ring, the bearing ring is a circular ring with a rectangular cross section, and the inner diameter and the outer diameter of the bearing ring are respectively matched with the inner diameter and the outer diameter of the resistance spring. Two ends of the resistance spring are respectively in contact with the lateral surface of the annular boss on the right side of the middle section of the inner shaft and the lateral surface of the trigger ring through the bearing ring, so that the stress distribution of the resistance spring can be improved to a greater extent, and meanwhile, the size precision of the installation of the resistance spring is improved.

Fig. 7 is a three-dimensional schematic diagram of two resistance springs according to the present invention, in which 5 is a resistance spring, a is a carrier ring, a is a first resistance spring, and b is a second resistance spring. As can be seen from the figure, in order to improve the power transmission load of the present invention, the number of the resistance springs is two, and the pitch of the resistance springs is larger than the diameter of the steel wire for winding the resistance springs, and the resistance springs are arranged at 180 degrees on the circumference. Therefore, when the resistance springs are expanded and pressed, two springs are expanded and pressed on the inner wall of the outer shaft, and the bearing capacity can be improved.

Fig. 8 is a three-dimensional schematic diagram of three resistance springs according to the present invention, in which 5 is a resistance spring, a is a carrier ring, a is a first resistance spring, b is a second resistance spring, and c is a third resistance spring. As can be seen, in order to increase the power transmission load, the number of the resistance springs is three, and the pitch of the resistance springs is larger than twice the diameter of the wire around which the resistance springs are wound, and is arranged at 120 degrees on the circumference. Therefore, when the resistance springs are expanded and pressed, three springs are expanded and pressed on the inner wall of the outer shaft, and the bearing capacity can be improved.

Fig. 9 is a schematic cross-sectional view of the resistance spring wound steel wire of the present invention with a rectangular cross-sectional shape. In the figure, 5 is a resistance spring. As can be seen from the figure, in order to further improve the power transmission load of the present invention, the cross-sectional shape of the wound wire of the resistance spring is rectangular. So, can effectively improve and expand the footpath and support the friction area of pressing time resistance spring and outer axle inner wall, improve frictional force to improve moment of torsion and bear the load.

Fig. 10 is a three-dimensional schematic diagram of the resistance spring after the inner and outer circles of the present invention are both ground, and in the diagram, 5 is resistance spring i. The key part in the spring clutch is a resistance spring, and particularly, the matching parameters of the resistance spring and other parts have great influence on the sensitivity and reliability of the spring clutch. Preferably, the total fit clearance between the inner circle of the resistance spring and the outer circle of the inner shaft is less than 0.10mm, and the total fit clearance between the outer circle of the resistance spring and the inner circle of the outer shaft is 0.20 mm-0.50 mm. In order to ensure the dimensional accuracy and surface smoothness of the inner circle and the outer circle of the resistance spring, the resistance spring is a structure with high dimensional progress and high surface smoothness, wherein the inner circle and the outer circle of the resistance spring are both ground.

Obviously, the utility model discloses the beneficial technological effect of internal push trigger formula spring clutch is simple structure, and manufacturing cost is lower to, the process of joint or break-off power is all comparatively steady and controllable.

Claims (9)

1. An internal-pushing triggering type spring clutch is characterized by comprising an inner shaft, an outer shaft, a bearing, a triggering mechanism and a resistance spring; the inner shaft is a hollow shaft, and the large half section on the right side of the inner shaft is a hollow section; steps for mounting bearings are arranged at two ends of the inner shaft, annular bosses are respectively arranged at two ends of the middle section of the inner shaft, and rectangular through holes with the width same as that of the cross section of the top plate and the length twice of that of the cross section of the top plate are radially arranged at the inner side of the right end of the middle section of the inner shaft; the outer shaft is sleeved on the excircle of the inner shaft, and two ends of the outer shaft are fixed on the inner shaft through bearings respectively; the bearings are arranged at two ends of the inner shaft and the outer shaft and are used as supports between the inner shaft and the outer shaft; the trigger mechanism is arranged on the hollow section of the inner shaft and comprises a return spring, a top column, a trigger ring, a top plate, a flat plate bearing, a push rod and an electric screw rod; the reset spring, the top column, the flat plate bearing and the push rod are sequentially arranged on the inner shaft hollow section from left to right, and the outer circles of the reset spring, the top column, the flat plate bearing and the push rod are in sliding fit with the inner circle of the inner shaft hollow section; the top column is radially provided with a rectangular through hole of which the shape and size are in interference fit with the cross section of the top plate, the top plate is a long strip plate of which the cross section is rectangular, and the top column is inserted into the rectangular through hole of the top column from the rectangular through hole of the inner shaft after being placed below the rectangular through hole of the hollow section of the inner shaft and is fixed in the middle position of the top column in the radial direction; the trigger ring is sleeved on the outer circle of the middle section of the inner shaft and is fixedly connected with the inner side surface of the top plate; the electric screw rod is sleeved at the tail end of the outer side of the push rod, and the push rod and the electric screw rod do not rotate along with the inner shaft; the electric screw rod pushes the push rod to move leftwards, and the trigger ring is pushed to move leftwards through the top plate; the resistance spring is the close packing type spring of anticlockwise coiling, installs between interior axle annular boss and trigger ring, and the internal diameter and the external diameter of resistance spring respectively with interior axle excircle and outer interior round sliding fit of axle, the medial surface of the left annular boss in interior axle middle section is fixed to the left end of resistance spring.

2. The inner push trigger type spring clutch according to claim 1, wherein the outer shaft is of a two-section structure, the two-section outer shaft is sleeved on the outer circle of the inner shaft, and the outer ends of the two-section outer shaft are fixed on the inner shaft through bearings respectively; in addition, the left end of the resistance spring is fixed on the inner side surface of the annular boss on the left side of the middle section of the inner shaft or the left end of the inner wall of the outer shaft on the left section.

3. The push-to-trigger spring clutch of claim 2, wherein the top plate is disposed axially intermediate the inner shaft; the two trigger rings are respectively arranged on the left side and the right side of the top plate; the two resistance springs are respectively sleeved between the left and right two sections of outer shafts and the inner shaft, and the outer ends of the two resistance springs are respectively fixed on the inner side surfaces of the annular bosses on the outer sides of the left and right two sections of outer shafts; and the electric screw rod can position the push rod at the middle position between the two resistance springs, push the push rod to move towards the left resistance spring and push the push rod to move towards the right resistance spring.

4. The inner push trigger type spring clutch according to any one of claims 1 to 3, wherein bearing rings are welded to two ends of the resistance spring, the bearing rings are circular rings with rectangular cross sections, and the inner and outer diameters of the bearing rings are matched with the inner and outer diameters of the resistance spring.

5. The inner push trigger spring clutch according to any one of claims 1 to 3, wherein the number of the resistance springs is two, and the pitch of the resistance springs is larger than the diameter of the wire around which the resistance springs are wound, and is arranged at 180 degrees on the circumference.

6. The inner push trigger spring clutch according to any one of claims 1 to 3, wherein the number of the resistance springs is three, and the pitch of the resistance springs is larger than twice the diameter of the wire around which the resistance springs are wound, and is arranged at 120 degrees on the circumference.

7. The inner push trigger spring clutch according to any one of claims 1 to 3, wherein the cross-sectional shape of the wound wire of the resistance spring is rectangular.

8. The push-trigger spring clutch according to any one of claims 1 to 3, wherein the total fit clearance between the inner circle of the resistance spring and the outer circle of the inner shaft is less than 0.10mm, and the total fit clearance between the outer circle of the resistance spring and the inner circle of the outer shaft is 0.20mm to 0.50 mm.

9. The inner-push triggered spring clutch according to any one of claims 1 to 3, wherein the resistance spring is a high dimensional-progress, high surface finish structure with both inner and outer circles ground.

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