CN212564135U

CN212564135U - External adjustment type overrunning clutch with overload protection function

Info

Publication number: CN212564135U
Application number: CN202021275473.XU
Authority: CN
Inventors: 张道礼
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-02-19
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses an external adjustment type overrunning clutch with overload protection function, which comprises a shell and a clutch core; a radial guide hole is formed in the shell; an adjusting bolt, a pressure spring and a spring pin are sequentially arranged in the guide hole from outside to inside; the end part of the elastic pin is provided with a first cambered surface; the clutch core is provided with a clamping groove matched with the elastic pin, and the clamping groove is provided with a second cambered surface in line contact with the first cambered surface. The radius of the first cambered surface is the same as that of the second cambered surface. The clamping groove further comprises a second sliding wall, a pin hole is formed in the position, where the second sliding wall is located, of the clutch core, and the axis of the pin hole is parallel to the axis of the clutch core; the pin hole is provided with an axial opening, the opening is communicated with the clamping groove, and the width of the opening is smaller than the diameter of the pin hole. When the elastic pin is popped up, the contact area of the elastic pin and the clutch core is reduced, and the sliding-out resistance is reduced. Meanwhile, the abrasion to the clutch core is reduced, and the service life of the product is prolonged.

Description

External adjustment type overrunning clutch with overload protection function

Technical Field

The utility model belongs to the technical field of freewheel clutch, specifically speaking relates to an outer regulation formula freewheel clutch with overload protection function.

Background

The rotary cultivator is a main agricultural implement for turning the agricultural machinery at the present stage, and the turning operation is carried out under the traction drive of a tractor. Due to the fact that obstacles such as stones and stumps often exist in soil, the torque generated by a normally operated rotary cultivator is too large, and destructive damages such as cutters, a rotary cultivator gearbox and a transmission shaft are caused.

The existing protection measures are that a safety pin is arranged between an input power transmission shaft and an input shaft of a gear box of a rotary cultivator, and the protection is carried out by cutting off the safety pin.

In the process of implementing the invention, the inventor finds that the prior art has at least the following disadvantages:

1. the safety pin is frequently replaced, and the working efficiency is influenced.

2. The safety pin only plays a role in ultimate protection, and potential safety hazards exist continuously in a power output high-speed rotating state.

Patent document CN207701623U discloses an overload protection clutch with spring pins, and the inventor finds that the problem is that the spring pins wear the clutch core particularly seriously during ejection.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem to above not enough, provide an outer regulation formula freewheel clutch with overload protection function, overcome the defect that prior art exists, have overload protection function, reduce the wearing and tearing of clutch.

In order to solve the technical problem, the technical scheme of the utility model is that: an external adjustment type overrunning clutch with an overload protection function comprises a shell and a clutch core; a radial guide hole is formed in the shell; an adjusting bolt, a pressure spring and a spring pin are sequentially arranged in the guide hole from outside to inside; the end part of the elastic pin is provided with a first cambered surface;

the clutch core is provided with a clamping groove matched with the elastic pin, and the clamping groove is provided with a second cambered surface in line contact with the first cambered surface.

Further, the radius of the first cambered surface is the same as that of the second cambered surface.

Furthermore, the clamping groove also comprises a second sliding wall, a pin hole is formed in the position, where the second sliding wall is located, of the clutch core, and the axis of the pin hole is parallel to the axis of the clutch core; the pin hole is provided with an axial opening, the opening is communicated with the clamping groove, and the width of the opening is smaller than the diameter of the pin hole.

Further, the second sliding wall is tangent to the inner wall of the pin hole at the opening; the outer surface of the clutch core is tangent to the inner wall of the pin hole at the opening.

Furthermore, the shell is fixedly connected with the power input shaft, the clutch core is connected with the output shaft, and the shell is arranged outside the clutch core.

Furthermore, a buffer spring with the same height and the same number of turns as the pressure spring is arranged in the pressure spring, and the fatigue resistance of the spring is improved due to the arrangement of the buffer spring.

Furthermore, locking screws are arranged on the side face of the shell, the axis of each locking screw is parallel to the axis of the power input shaft (5), the locking screws are distributed on two sides of the guide hole, and after the adjusting bolt adjusts the torque, the locking screws lock the adjusting bolt; the adjusting bolt is prevented from loosening in the using process, so that the adjusted torque of the adjusting bolt is influenced.

Further, the number of the guide holes is four.

The utility model adopts the above technical scheme, compare with prior art, have following advantage:

1. the cambered surface design of the radial boss of the end face of the elastic pin and the clamping groove matched with the radial boss are added, so that the agricultural implement and other transmission devices are effectively protected.

2. The clutch adopts the rotating bearing pin, and when the elastic pin is popped out, the contact area of the elastic pin and the core of the clutch is reduced, and the sliding-out resistance is reduced. Meanwhile, the abrasion to the clutch core is reduced, and the service life of the product is prolonged.

Drawings

FIG. 1 is an axial cross-sectional view of an externally adjustable overrunning clutch of the present invention having overload protection;

FIG. 2 is a sectional view taken along line D-D of FIG. 1;

FIG. 3 is a perspective semi-sectional view of an externally adjustable overrunning clutch with overload protection of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is a schematic view of the construction of the latch of FIG. 4;

fig. 6 is a schematic structural view of the clutch core of fig. 4.

In the figure, the position of the upper end of the main shaft,

1-elastic pin, 2-pressure spring, 3-adjusting bolt, 4-clutch core, 5-power input shaft, 6-shell, 7-locking screw, 8-fixed pressure plate, 9-first snap spring, 10-oil seal, 11-supporting plate, 12-clamping groove, 13-guide hole, 14-boss, 15-groove, 16-second snap spring, 17-rotary bearing pin, 18-buffer spring, 19-radial boss, 20-first sliding wall, 21-first cambered surface, 24-second cambered surface, 25-second sliding wall, 26-pin hole and 27-opening.

Detailed Description

In order to clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, and those skilled in the art will understand that the following does not limit the scope of the present invention.

In the embodiment, as shown in fig. 1-6, an external adjustment type overrunning clutch with overload protection function comprises a clutch core 4, wherein the clutch core 4 is connected with an input shaft of a transmission of a rotary cultivator, a shell 6 is arranged outside the clutch core 4, and the shell 6 is fixedly connected with a power input shaft 5.

The shell 6 is evenly provided with 4 radial guiding holes 13, the adjusting bolt 3, the pressure spring 2 and the spring pin 1 are sequentially arranged in the guiding holes 13 from outside to inside, and the adjusting bolt 3 is in threaded connection with the inner wall of the guiding holes 13. The adjusting bolt 3 is used for adjusting the maximum torque of the compression spring 2.

The end of the spring pin 1 is provided with a radial boss 19, and the radial boss 19 comprises a first sliding wall 20 and a first cambered surface 21. The first arc surface 21 is an arc surface with a radius r.

The cylindrical surface of the clutch core 4 is provided with a radial clamping groove 12, and the clamping groove 12 is used for clamping and placing a radial boss 19.

The slot 12 includes a second arcuate surface 24 and a second slide wall 25.

The second arc surface 24 is an arc surface with a radius R, wherein R is the same as R.

The contact position of the first cambered surface 21 and the second cambered surface 24 is a straight line, so that the contact area is small, the friction resistance is reduced, and the heat generated by friction is reduced.

The second slide wall 25 is provided with a pin hole 26 at a position of the clutch core 4, and an axis of the pin hole 26 is parallel to an axis of the clutch core 4.

The pin bore 26 is provided with an axial opening 27, the opening 27 communicating with the catch 12, the width of the opening 27 being smaller than the diameter of the pin bore 26. The second slide wall 25 is tangential to the inner wall of the pin bore 26 at the opening 27. The outer surface of the clutch core 4 is tangent to the inner wall of the pin bore 26 at the opening 27.

A pin 17 is rotatably disposed in the pin hole 26.

The buffer springs 18 with the same height and the same number of turns as the compression springs 2 are arranged in the compression springs 2, and the fatigue resistance of the springs is improved due to the arrangement of the double sets of compression springs.

The side of the shell 6 is provided with locking screws 7, the axes of the locking screws 7 are parallel to the axis of the power input shaft 5, and the locking screws 7 are distributed on two sides of the guide hole 13. After the adjusting bolt 3 adjusts the torque, the locking screw 7 locks the adjusting bolt 3. The adjusting bolt 3 is prevented from loosening in the using process, so that the adjusted torque of the adjusting bolt 3 is influenced.

The surface of the clutch core 4 is provided with a boss 14, one side of the boss 14, which is close to the power input shaft 5, is provided with a groove 15, a supporting plate 11 and a first clamp spring 9 are sleeved in the groove 15, one surface of the supporting plate 11 is tightly attached to the side surface of the boss 14, the other surface of the supporting plate 11 is connected with the first clamp spring 9, and the first clamp spring 9 is tightly connected with the side surface of the groove 15.

An oil seal 10 is installed on the clutch core 4, the oil seal 10 is arranged on one side, away from the input shaft 5, of the clutch core 4, the top of the oil seal 10 is connected with the shell 6 in a sealing mode, and the oil seal 10 is dustproof and wear-resistant. A fixed pressing plate 8 and a second clamp spring 16 are arranged between the oil seal 10 and the boss 14, the fixed pressing plate 8 and the second clamp spring 16 are sleeved on the clutch core 4, the fixed pressing plate 8 is tightly attached to the side face of the boss 14, and the second clamp spring 16 is tightly arranged between the fixed pressing plate 8 and the inner surface of the oil seal 10.

Under normal operating condition, power input shaft 5 transmits power to casing 6, and casing 6 transmits power to bullet round pin 1, and the first cambered surface 21 of the radial boss 19 of bullet round pin 1 closely laminates with the second cambered surface 24 of draw-in groove 12 of clutch core 4 under adjusting bolt 3, the effort of pressure spring 2, and clutch core 4 transmits power to the rotary cultivator blade.

When the blade of the rotary cultivator is subjected to torque exceeding the torque under the normal working state, the blade of the rotary cultivator normally rotates and suddenly encounters a stone, the blade of the rotary cultivator collides against a hard object at a certain speed, the speed of the clutch core 4 is reduced at the moment when the blade of the rotary cultivator is contacted with the object, and the radial boss 19 of the elastic pin 1 slides out of the clamping groove 12 of the clutch core 4 because the input shaft 5 continuously drives the elastic pin 1 to rotate at the normal speed. The first slide wall 20 of the radial boss 19 of the elastic pin 1 passes through the second slide wall 25 and the side surface of the pin 17 to reach the outer surface of the clutch core 4. When first slide wall 20 contact round pin axle 17, round pin axle 17 rotates along with radial boss 19, and the setting of round pin axle 17 has reduced the roll-off resistance of radial boss 19, has reduced the area of contact of bullet round pin 1 with clutch core 4, has reduced the wearing and tearing to clutch core 4 simultaneously, has improved product life.

At the moment when the elastic pin 1 slides out, the input power and the output power are separated, the clutch core 4 stops rotating, and the input shaft 5 idles.

When the rotary cultivator passes over an obstacle, the radial boss 19 of the elastic pin 1 slides into the clamping groove 12, and the clutch core 4 rotates along with the elastic pin 1. The clutch core 4 continues to work normally under the drive of the elastic pin 1. The rotary cultivator resumes normal operation.

When the user changes the operation in the landmass, according to the actual situation of soil, loosen 8 locking screw 7 with No. 8 allen key, adjust adjusting bolt 3.

When the clockwise rotation is carried out, the pressure of the pressure spring 2 is increased, otherwise, the pressure is reduced. (the part 7 adjustment bolt is M42 x 2-6H thread, a single clockwise rotation will compress the compression spring 2 to produce a pressure of about 200 n.m.). After the proper protection torque is adjusted, the locking screw 7 is locked, and normal operation can be realized.

After a working season (about 6 months) of continuous use, a maintenance replacement of the lithium-based high-speed grease is performed. The method comprises the following steps:

1. and loosening the locking screw 7, screwing out the adjusting bolt 3, recording the number of screwing-out turns, and taking reference for subsequent assembly. And then the pressure spring 2 and the spring pin 1 are taken out in sequence.

2. And (3) taking down the oil-proof seal 10 by using a flat screwdriver, and then sequentially taking down the clamp spring 9 and the fixed pressing plate 8 by using an inner clamp spring clamp.

3. The clutch core 4 is easily removed from the housing 6.

4. And (4) cleaning the lubricating grease on the parts by using kerosene, refilling the lithium-based high-speed lubricating grease, and sequentially assembling the parts according to the disassembly sequence.

The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.

Claims

1. An external adjustment type overrunning clutch with an overload protection function is characterized in that: comprises a shell (6) and a clutch core (4); a radial guide hole (13) is formed in the shell (6); an adjusting bolt (3), a pressure spring (2) and a spring pin (1) are sequentially arranged in the guide hole (13) from outside to inside;

the end part of the elastic pin (1) is provided with a first cambered surface (21);

the clutch core (4) is provided with a clamping groove (12) matched with the elastic pin (1), and the clamping groove (12) is provided with a second cambered surface (24) in line contact with the first cambered surface (21).

2. An externally-adjusted overrunning clutch having overload protection as claimed in claim 1 wherein: the first cambered surface (21) and the second cambered surface (24) have the same radius.

3. An externally-adjusted overrunning clutch having overload protection as claimed in claim 2 wherein: the clamping groove (12) further comprises a second sliding wall (25), a pin hole (26) is formed in the position, where the second sliding wall (25) is located, of the clutch core (4), and the axis of the pin hole (26) is parallel to the axis of the clutch core (4);

the pin hole (26) is provided with an axial opening (27), the opening (27) is communicated with the clamping groove (12), and the width of the opening (27) is smaller than the diameter of the pin hole (26).

4. An externally-adjusted overrunning clutch having overload protection as claimed in claim 3 wherein: the second sliding wall (25) is tangent to the inner wall of the pin hole (26) at the opening (27); the outer surface of the clutch core (4) is tangent to the inner wall of the pin hole (26) at the opening (27).

5. An externally-adjusted overrunning clutch having overload protection as claimed in claim 4 wherein: the shell (6) is fixedly connected with the power input shaft (5), the clutch core (4) is connected with the output shaft, and the shell (6) is arranged outside the clutch core (4).

6. An externally-adjusted overrunning clutch having overload protection as claimed in claim 5 wherein: the buffer springs (18) with the same height and the same number of turns as the compression springs (2) are arranged in the compression springs (2), and the arrangement of the buffer springs (18) improves the fatigue resistance of the springs.

7. An externally-adjusted overrunning clutch having overload protection as claimed in claim 6 wherein: the lateral surface of the shell (6) is provided with locking screws (7), the axes of the locking screws (7) are parallel to the axis of the power input shaft (5), the locking screws (7) are distributed on two sides of the guide hole (13), and after the torque is adjusted by the adjusting bolt (3), the adjusting bolt (3) is locked by the locking screws (7); the adjusting bolt (3) is prevented from loosening in the using process, so that the adjusted torque of the adjusting bolt (3) is influenced.

8. An externally-adjusted overrunning clutch having overload protection as claimed in claim 7 wherein: the number of the guide holes (13) is four.