阅读说明：本技术 用于绞盘机的过载保护装置 (Overload protection device for winch ) 是由 游文杰 于 2019-08-28 设计创作，主要内容包括：一种用于绞盘机的过载保护装置,其包含有一根输入轴、一根输出轴及一个离合组件。输入轴具有一个第一传动端,输出轴具有一个第二传动端,离合组件具有一个第一离合件及一个第二离合件,第一离合件设于输入轴的第一输出端,使第一离合件能随输入轴一起转动,第二离合件设于输出轴的第二传动端,使第二离合件能随输出轴一起转动,第一离合件与第二离合件之间以可分离的方式相互卡接。以此,在输出轴受到过大负载的情况下,第一离合件与第二离合件会产生跳脱以切断输入轴与输出轴之间的动力传输关系,使整体结构获得保护效果。(An overload protection device for a winch comprises an input shaft, an output shaft and a clutch assembly. The input shaft has a first transmission end, the output shaft has a second transmission end, clutch assembly has a first clutch spare and a second clutch spare, the first output of input shaft is located to first clutch spare, make first clutch spare rotate along with the input shaft, the second transmission end of output shaft is located to the second clutch spare, make second clutch spare rotate along with the output shaft, joint each other with separable mode between first clutch spare and the second clutch spare. Therefore, under the condition that the output shaft is subjected to an overlarge load, the first clutch piece and the second clutch piece can be tripped to cut off the power transmission relation between the input shaft and the output shaft, so that the whole structure obtains a protection effect.)

1. An overload protection device for a winch, comprising:

an input shaft having an input end and a first transmission end;

the output shaft coaxially corresponds to the input shaft and is provided with a second transmission end and an output end; and

the clutch component is provided with a first clutch piece, a second clutch piece and an elastic piece, wherein the first clutch piece is arranged at a first output end of the input shaft, so that the first clutch piece can synchronously move along with the input shaft, the second clutch piece is arranged at a second transmission end of the output shaft, so that the second clutch piece can synchronously move along with the output shaft, the first clutch piece is provided with a first clamping part, the second clutch piece is provided with a second clamping part, the first clamping part of the first clutch piece is detachably clamped in the second clamping part of the second clutch piece, and the elastic piece acts on the first clutch piece and is used for pushing the first clutch piece towards the direction of the second clutch piece.

2. The overload protection apparatus for a winch of claim 1, wherein the first engaging portion of the first clutch member is one of a groove and a protrusion, and the second engaging portion of the second clutch member is the other of the groove and the protrusion.

3. The overload protection apparatus for a winch according to claim 2, wherein the first engaging portion of the first clutch has two first inclined surfaces and a first plane engaging the two first inclined surfaces, the two first inclined surfaces incline in opposite directions, the second engaging portion of the second clutch has two second inclined surfaces and a second plane engaging the two second inclined surfaces, the two second inclined surfaces incline in opposite directions, when the first engaging portion of the first clutch engages the second engaging portion of the second clutch, the first inclined surface of the first engaging portion abuts against the second inclined surface of the second engaging portion, and the first plane of the first engaging portion abuts against the second plane of the second engaging portion.

4. The overload protection device for a winch according to claim 1, wherein the first clutch member has a first shaft hole extending through two opposite sides, the first shaft hole is disposed at the first driving end of the input shaft, and the hole wall of the first shaft hole has a locking groove engaged with the locking portion of the first driving end of the input shaft.

5. The overload protection apparatus for a winch of claim 1, wherein the first driving end of the input shaft has a threaded hole, and the clutch assembly further has a screw passing through a washer and threadedly received in the threaded hole such that the washer abuts against a side surface of the first clutch member facing the second clutch member and an end surface of the first driving end of the input shaft.

6. The overload protection apparatus for a winch according to claim 1, wherein the elastic member is disposed around the input shaft, the input shaft has a shoulder portion on an outer circumferential surface thereof between the input end and the first transmission shaft, the clutch assembly further has a support ring, one side surface of the support ring abuts against the shoulder portion of the input shaft, the other opposite side surface of the support ring receives one end of the elastic member, and the other end of the elastic member abuts against a side surface of the first clutch member facing away from the second clutch member.

7. The overload protection apparatus for a winch of claim 6, wherein a side of the first clutch member facing away from the second clutch member has a shaft portion and a receiving groove surrounding the shaft portion, and an end of the elastic member is disposed on the shaft portion and located in the receiving groove.

8. The overload protection device for a winch according to claim 1, wherein the second clutch member has a second shaft hole penetrating two opposite sides, the second shaft hole is disposed at the second transmission end of the output shaft, the wall of the second shaft hole has a second tangential plane, the outer peripheral surface of the second transmission end of the output shaft has a first tangential plane, and the first and second tangential planes abut against each other.

9. The overload protection apparatus for a winch of claim 1, wherein the second driving end of the output shaft has a snap ring groove, and a snap ring is disposed in the snap ring groove and abuts against a side surface of the second clutch member facing the first clutch member.

10. The overload protection apparatus for a winch according to claim 1, wherein the input end of the input shaft has a hexagonal cross-sectional shape.

Technical Field

The invention relates to a winch, in particular to an overload protection device for the winch.

Background

A winch is a mechanical device for winding or releasing a wire rope by using rotation of a drum. In order to avoid the damage of the transmission shaft if the power source continues to output power to the transmission shaft disposed in the winding drum after the winding of the steel cable is completed, an overload protection device is usually disposed inside the winch to protect the transmission shaft, so that the transmission shaft can be released from the power transmission relation with the power source when the load is too large.

In the related prior art, the overload protection device disclosed in taiwan patent No. I622549 is mainly configured by the rolling members and the inner and outer arc grooves, and the power transmission relationship between the input shaft and the transmission collar is released under the condition of an excessive load, so that the input shaft cannot transmit power to the output shaft, thereby achieving the protection effect on the entire structure. The aforementioned patent still has room for improvement in structure.

Disclosure of Invention

The main object of the present invention is to provide an overload protection device for a winch, which has a good overload protection effect.

In order to achieve the above-mentioned primary object, the overload protection apparatus of the present invention includes an input shaft, an output shaft, and a clutch assembly. The input shaft is coaxially corresponding to the output shaft, the input shaft is provided with an input end and a first transmission end, and the output shaft is provided with a second transmission end and an output end; the clutch assembly is provided with a first clutch piece, a second clutch piece and an elastic piece, wherein the first clutch piece is arranged at a first output end of the input shaft, so that the first clutch piece can synchronously move along with the input shaft, the second clutch piece is arranged at a second transmission end of the output shaft, so that the second clutch piece can synchronously move along with the output shaft, in addition, the first clutch piece is provided with a first clamping part, the second clutch piece is provided with a second clamping part, the first clamping part of the first clutch piece is clamped in the second clamping part of the second clutch piece in a separable mode, and the elastic piece acts on the first clutch piece and is used for pushing the first clutch piece to the direction of the second clutch piece.

Therefore, under the condition that the output end of the output shaft is under normal load, the first clamping part of the first clutch part and the second clamping part of the second clutch part are clamped with each other, so that the input shaft can transmit power to the output shaft through the clutch assembly, and the output shaft can rotate smoothly. Once the output end of the output shaft is under the condition of overlarge load, the first clamping part of the first clutch piece and the second clamping part of the second clutch piece can be tripped to cut off the power transmission relation between the input shaft and the output shaft, so that the input shaft can not transmit power to the output shaft, and the overall structure is protected.

Preferably, the first engaging portion of the first clutch is one of a groove and a protrusion, the first engaging portion has two first inclined surfaces with opposite inclination directions and a first plane engaged with the two first inclined surfaces, the second engaging portion of the second clutch is the other of the groove and the protrusion, and the second engaging portion has two second inclined surfaces with opposite inclination directions and a second plane engaged with the two second inclined surfaces. Therefore, when the first clamping part of the first clutch is clamped with the second clamping part of the second clutch, the first inclined surface of the first clamping part abuts against the second inclined surface of the second clamping part, and the first plane of the first clamping part abuts against the second plane of the second clamping part, so that under the condition that the output end of the output shaft is subjected to overlarge load, the first clamping part of the first clutch is clamped with the second clamping part of the second clutch and can be quickly and reliably tripped by utilizing the matching of the first inclined surface and the second inclined surface.

Preferably, the outer peripheral surface of the first transmission end of the input shaft is provided with an embedding part, the first clutch part is provided with a first shaft hole, the first clutch part is sleeved on the first transmission end of the input shaft through the first shaft hole, in addition, the hole wall of the first shaft hole is provided with an embedding groove, the input shaft is embedded in the embedding groove of the first clutch part through the embedding part of the first transmission end, and the input shaft can drive the first clutch part to rotate together.

Preferably, the first transmission end of the input shaft has a screw hole, and the clutch assembly further has a screw passing through a washer and threadedly disposed in the screw hole, so that the washer abuts against the first clutch member and the first transmission end of the input shaft to prevent the first clutch member from falling off.

Preferably, a side of the first clutch facing away from the second clutch has a shaft portion and a receiving groove surrounding the shaft portion, the elastic member is sleeved on the input shaft, the outer peripheral surface of the input shaft has a shoulder portion located between the input end and the first transmission shaft, the clutch assembly further has a support ring, one side of the support ring abuts against the shoulder portion of the input shaft, the other opposite side of the support ring receives one end of the elastic member, the other end of the elastic member is sleeved on the shaft portion of the first clutch and located in the receiving groove of the first clutch and abuts against a side of the first clutch facing away from the second clutch, so that the elastic member provides elastic force to push the first clutch toward the second clutch.

Preferably, the second clutch has a second shaft hole, the second clutch is sleeved on the second transmission end of the output shaft through the second shaft hole, the hole wall of the second shaft hole has a second tangent plane, the peripheral surface of the second transmission end of the output shaft has a first tangent plane, and the first tangent plane and the second tangent plane are abutted against each other, so that the second clutch can rotate along with the output shaft.

Preferably, the second transmission end of the output shaft has a snap ring groove, a snap ring is arranged in the snap ring groove, and the snap ring abuts against a side surface of the second clutch piece facing the first clutch piece so as to prevent the second clutch piece from falling off.

Preferably, the input end of the input shaft is hexagonal in cross-section for engagement with a chuck to enable the input shaft to be driven for rotation by a power tool having the chuck.

The detailed construction, features, assembly or use of the overload protection device for a winch according to the present invention will be described in the detailed description of the embodiments that follow. However, it should be understood by those skilled in the art that the detailed description and specific examples, while indicating the specific embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Drawings

Fig. 1 is a perspective view of a winch to which the overload protection apparatus of the present invention is applied;

fig. 2 is a perspective view of an overload protection apparatus of the present invention;

fig. 3 is an exploded perspective view of the overload protection apparatus of the present invention;

FIG. 4 is a cross-sectional view of an overload protection apparatus of the present invention;

FIG. 5 is a plan view of the overload protection apparatus of the present invention, mainly showing the first engaging portion of the first clutch member and the second engaging portion of the second clutch member engaged with each other;

FIG. 6 is similar to FIG. 5, and mainly shows the first engaging portion of the first clutch and the first engaging portion of the second clutch being separated from the second engaging portion of the second clutch.

In the above drawings, the reference numerals have the following meanings:

10 winch 12 casing

14-spool 16 reduction gear set

18 overload protection device 20 input shaft

21 input terminal 22 first transmission terminal

23 inserting part 24 screw hole

25 shoulder 30 output shaft

31 output terminal 32 second transmission terminal

33 first tangent plane 34 snap ring groove

40 Clutch assembly 50 first clutch member

51 first shaft hole 52 embedding slot

53 shaft portion 54 receiving groove

55 first engaging portion 56 first inclined surface

57 first plane 58 screw

59 washer 60 second clutch

61 second axial hole 62 second tangent plane

63 second engaging portion 64 second inclined surface

65 second plane 66 thrust bearing

67 snap ring 68 elastic member

69 support ring

Detailed Description

Applicants first describe herein, throughout this specification, including the examples and claims that follow, directional terminology will be used with reference to the orientation of the figures. Next, in the embodiments and the drawings to be described below, the same element numbers denote the same or similar elements or structural features thereof.

Referring to fig. 1, a winch 10 is shown including a housing 12, a winding drum 14 and a reduction gear set 16, wherein the winding drum 14 is rotatably disposed in the housing, and the reduction gear set 16 is disposed in the housing 12 and connected to one end of the winding drum 14, so that the winding drum 14 can be driven by the reduction gear set 16 to wind or release a cable (not shown). Referring to fig. 2 and 3, the overload protection apparatus 18 of the present invention includes an input shaft 20, an output shaft 30, and a clutch assembly 40.

The input shaft 20 is rotatably disposed on the winding drum 14 and has an input end 21 and a first transmission end 22. The input end 21 is located outside the winding drum 14, and the cross section of the input end 21 is hexagonal so as to be connected with a chuck (not shown) of the electric tool, so that the input shaft 20 can be driven by the electric tool to rotate; the first transmission end 22 is located in the winding drum 14, the outer peripheral surface of the first transmission end 22 has a plurality of strip-shaped engagement portions 23 arranged in an annular shape at equal intervals, and the first transmission end 22 has a screw hole 24 extending along the axial direction thereof. In addition, the outer peripheral surface of the input shaft 20 further has a shoulder 25 located between the input end 21 and the first transmission end 22.

The output shaft 30 is rotatably disposed on the spool 14 and is coaxial with the input shaft 20. The output shaft 30 has an output end 31 and a second transmission end 32, the output end 31 is located outside the winding drum 14 and connected to the reduction gear set 16 (as shown in fig. 4), so that the output shaft 30 can drive the reduction gear set 16, the second transmission end 32 is located inside the winding drum 14 and has a first tangent plane 33, and the outer peripheral surface of the second transmission end 32 further has a snap ring groove 34.

The clutch assembly 40 has a first clutch member 50, a second clutch member 60, and a resilient member 68, wherein:

the first clutch 50 has a first shaft hole 51 penetrating through the left and right opposite side surfaces, the hole wall of the first shaft hole 51 has a plurality of strip-shaped engaging grooves 52 arranged at equal intervals in a ring shape, the first clutch 50 is sleeved on the first transmission end 22 of the input shaft 20 by using the first shaft hole 51, and then the engaging grooves 52 are engaged on the engaging portion 23 of the first transmission end 22 of the input shaft 20, so that the first clutch 50 can be driven by the input shaft 20 to rotate together. In addition, a screw 58 is inserted through a washer 59 and locked in the threaded hole 24 of the first transmission end 22 of the input shaft 20, so that the washer 59 abuts against the right side surface of the first clutch 50 and the end surface of the first transmission end 22 of the input shaft 20 to prevent the first clutch 50 from being disengaged from the first transmission end 22 of the input shaft 20. As shown in fig. 4, the left side of the first clutch 50 has a shaft 53 penetrated by the first shaft hole 51 and a containing groove 54 surrounding the shaft 53, and as shown in fig. 3 and 5, the edge of the right side of the first clutch 50 has a plurality of first engaging portions 55, the first engaging portions 55 are annularly arranged at equal intervals with the first shaft hole 51 as the center, each first engaging portion 55 is one of a groove and a projection, in this embodiment, each first engaging portion 55 is a groove and has two first inclined surfaces 56 with opposite inclined directions and a first plane 57 connecting the two first inclined surfaces 56.

The second clutch 60 has a second shaft hole 61 penetrating through the left and right opposite side surfaces, the hole wall of the second shaft hole 61 has a second tangential plane 62, the second clutch 60 is sleeved on the second transmission end 32 of the output shaft 30 by the second shaft hole 61 and abuts against a thrust bearing 66 arranged on the output shaft 30 with the right side surface thereof, and then the second tangential plane 62 abuts against the first tangential plane 33 of the second transmission end 32 of the output shaft 30, so that the second clutch 60 can drive the output shaft 30 to rotate together. In addition, the second clutch member 60 is prevented from being disengaged from the second driving end 32 of the output shaft 30 by a snap ring 67 that snaps into the snap ring groove 34 of the second driving end 32 of the output shaft 30 and abuts against the left side surface of the second clutch member 60. As shown in fig. 3 and 5, the edge of the left side surface of the second clutch 60 has a plurality of second engaging portions 63, the second engaging portions 63 are annularly arranged at equal intervals around the second shaft hole 61, each second engaging portion 63 is another one of the groove and the protrusion, in this embodiment, each second engaging portion 63 is a protrusion and has two second inclined surfaces 64 with opposite inclined directions and a second plane 65 connecting the two second inclined surfaces 64. Thus, as shown in fig. 5, when the first engaging portion 55 of the first clutch 50 is engaged with the second engaging portion 63 of the second clutch 60, the first inclined surface 56 of the first engaging portion 55 abuts against the second inclined surface 64 of the second engaging portion 63, and the first flat surface 57 of the first engaging portion 55 abuts against the second flat surface 65 of the second engaging portion 63.

The elastic member 68 (here, a compression spring) is sleeved on the input shaft 20, as shown in fig. 3 and 4, one end of the elastic member 68 is located in the accommodating groove 54 of the first clutch member 50, sleeved on the shaft portion 53 of the first clutch member 50, and abutted against the left side surface of the first clutch member 50, the other end of the elastic member 68 is abutted against a support ring 69, the support ring 69 is sleeved on the input shaft 20 and abutted against the shoulder 25 of the input shaft 20 for fixing, so that the elastic member 68 provides an elastic force to push the first clutch member 50 toward the second clutch member 60.

As mentioned above, when the input shaft 20 is driven by the electric tool to drive the first clutch 50 to rotate together, as shown in fig. 5, the first clutch 50 drives the second clutch 60 to rotate together by utilizing the engagement relationship between the first engaging portion 55 and the second engaging portion 63 of the second clutch 60, and then the output shaft 30 is driven by the second clutch 60 to start the reduction gear set 16, so that the reduction gear set 16 further drives the winding drum 14 to rotate, thereby achieving the effect of winding the steel cable.

When the rope is reeled up, the output shaft 30 will stop rotating along with the winding drum 14 together with the second clutch 60, if the power tool continues to output power to the input shaft 20 at this time, the input shaft 20 will also drive the first clutch 50 to rotate, however, once the first clutch 50 starts to rotate, because the second clutch 60 remains stationary, the first clutch 50 will move along the axial direction of the input shaft 20 in the direction away from the second clutch 60 and compress the elastic member 68 during the movement to accumulate the restoring force of the elastic member 68 through the engagement of the first inclined surface 56 and the second inclined surface 64, on the other hand, the first clutch 50 will rotate relative to the second clutch 60 to gradually disengage the first engaging portion 55 of the first clutch 50 from the second engaging portion 63 of the second clutch 60, until the power transmission relationship between the input shaft 20 and the output shaft 30 is cut off, when the first clutch 50 rotates to make the first engaging portion 55 face the second engaging portion 63 of the second clutch 60, the elastic restoring force released by the elastic member 68 will make the two engage again, that is, when the input shaft 20 continues to rotate under the condition that the output shaft 30 stops, the engagement and disengagement between the first engaging portion 55 of the first clutch 50 and the second engaging portion 63 of the second clutch 60 will be repeated until the input shaft 20 stops rotating.

In summary, in the overload protection apparatus 10 of the present invention, under the condition that the output end 31 of the output shaft 30 is under the normal load, the first engaging portion 55 of the first clutch 50 and the second engaging portion 63 of the second clutch 60 are engaged with each other, so that the input shaft 20 can transmit the power to the output shaft 30 through the clutch assembly 40, and the output shaft 30 can rotate smoothly. In a situation where the output end 31 of the output shaft 30 is subjected to an excessive load, the first engaging portion 55 of the first clutch 50 and the second engaging portion 63 of the second clutch 60 are disengaged to cut off the power transmission relationship between the input shaft 20 and the output shaft 30, so that the input shaft 20 cannot transmit power to the output shaft 30, and the overall structure is protected.