A winch

Abstract

The present invention provides a winch, belonging to the field of mechanical technology. It solves the problems of relatively high noise and low service life of the existing winches. This winch includes a frame, a main shaft, a winch drum and a brake assembly. The main shaft and the winch drum are connected by a transmission mechanism. The brake assembly includes a pawl and a ratchet, and there is an elastic member between the pawl and the frame. A disc is also sleeved on the main shaft. A propping member is hinged to the pawl. The pressing end of the propping member abuts against the outer peripheral wall of the disc and the disc can drive the propping member to swing. The pawl also has a first limiting portion, and when the propping member swings to abut against the first limiting portion, the distance from the hinge center of the propping member to the center of the disc is the largest. By setting up a simple structural combination of the disc and the propping member, and at the same time reasonably utilizing the existing elastic member, this winch realizes the engagement and disengagement between the pawl and the ratchet during the hoisting process, eliminates noise, avoids wear between the two, and extends the service life.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical technology and relates to a winch. Background Art

[0002] A manual winch is a machine with a vertically installed cable drum that can wind but not store ropes under power drive. It also refers to a winch with a rotation axis perpendicular to the deck. It is a self - protection and traction device for vehicles and ships, and can be used for self - rescue and rescue in harsh environments such as snow, swamps, deserts, beaches, and muddy mountain roads. It can also be used for tasks such as obstacle clearance, towing items, and installing facilities under other conditions. It is an indispensable safety device for military and police, petroleum, hydrology, environmental protection, forestry, transportation, public security, border defense, fire protection, and other outdoor sports.

[0003] For example, a Chinese patent application (application number: 201521082950.X) discloses a winch, which includes: a base, a brake assembly, and a winch drum assembly. The brake assembly is arranged inside the base; the brake assembly includes a rotating shaft, a first retaining plate, a first friction plate, a ratchet wheel, a second friction plate, a second retaining plate, a first gear, and a pawl assembly. The rotating shaft is rotatably arranged inside the base. The first retaining plate, the first friction plate, the ratchet wheel, the second friction plate, the second retaining plate, and the first gear are sequentially sleeved on the rotating shaft. The first gear is thread - connected to the rotating shaft. The pawl assembly and the ratchet wheel cooperate to reverse - stop the ratchet wheel; the winch drum assembly includes a drum and a second gear. The second gear is arranged on one side of the drum. The first gear is directly or indirectly engaged with the second gear. A rope for lifting goods is wound around the drum assembly of the winch. When towing or lifting goods, the rope is hooked and fixed on the goods. The rotating shaft rotates clockwise. The first gear, the first retaining plate, the first friction plate, the ratchet wheel, the second friction plate, and the second retaining plate are clamped and locked with each other and rotate together with the rotating shaft, thereby driving the drum to rotate and shortening the rope to lift the goods. The pawl and the ratchet wheel are unidirectionally locked, that is, it can rotate normally clockwise and is locked counterclockwise to prevent the goods from falling. When lowering the goods, the rotating shaft is rotated counterclockwise. At this time, the ratchet wheel remains stationary under the action of the pawl. Since the rotating shaft and the first gear are thread - connected, under the action of the thread, the first gear can translate a small distance to loosen the first friction plate. The goods drive the first gear to rotate clockwise relative to the rotating shaft again to clamp the first friction plate under the action of gravity, and the goods are lowered a certain distance. Repeating the above actions can achieve the smooth and slow lowering of the goods.

[0004] For the above - mentioned winch, due to the action of the torsion spring, the pawl always remains engaged with the ratchet wheel. Therefore, during the process of lifting goods, there is always a "click - click" sound between the pawl and the ratchet wheel, resulting in relatively high noise. At the same time, it also increases the wear between the pawl and the ratchet wheel and reduces the service life.

[0005] To solve the problems of wear and noise between the ratchet pawl and the ratchet wheel, the existing conventional practice is to provide a buffer wear-resistant layer on the ratchet wheel or ratchet teeth. However, there will still be more or less noise and wear is inevitable, only delayed appropriately. Summary of the Invention

[0006] The object of the present invention is to address the above problems existing in the prior art and propose a winch. The technical problem to be solved by the present invention is: how to solve the problems of relatively large noise and low service life of the existing winch.

[0007] The object of the present invention can be achieved by the following technical solutions: A winch, comprising a frame, a main shaft, a winch drum and a brake assembly. The main shaft and the winch drum are both rotatably connected to the frame and are connected by a transmission mechanism between the main shaft and the winch drum. The brake assembly includes a ratchet pawl hinged to the frame and a ratchet wheel connected to the main shaft, and there is an elastic member between the ratchet pawl and the frame to keep the ratchet pawl always in a meshing tendency with the ratchet wheel. It is characterized in that a wheel disc is also sleeved on the main shaft and the main shaft can drive the wheel disc to rotate. A long strip-shaped top support member is hinged to the ratchet pawl. The pressing end of the top support member presses against the outer peripheral wall of the wheel disc and the rotation of the wheel disc can drive the top support member to swing. The ratchet pawl also has a first limiting portion, and when the top support member swings to abut against the first limiting portion, the distance from the hinge center of the top support member to the center of the wheel disc is the largest.

[0008] When this winch is in use, in the initial state, the pawl remains engaged with the ratchet wheel. The pressing end of the supporting member presses against the outer peripheral wall of the wheel disc. The hinge axis of the supporting member, the axis of the wheel disc, and the tangent line between the pressing end and the outer peripheral wall of the wheel disc form a triangular distribution. Therefore, the distance between the hinge axis of the supporting member and the axis of the wheel disc is less than the sum of the distance from the hinge axis of the supporting member to the tangent line between the pressing end and the outer peripheral wall of the wheel disc and the distance from the axis of the wheel disc to the tangent line between the pressing end and the outer peripheral wall of the wheel disc. When it is necessary to tow or lift goods, the rope on the winch drum is hooked and fixed to the goods, and the main shaft rotates, driving the winch drum to rotate and shortening the rope to lift the goods. At the same time, the main shaft can also drive the wheel disc to rotate. Under the action of friction, the wheel disc can drive the supporting member to swing relative to the pawl and push the pawl to swing outwards away from the ratchet wheel until the supporting member abuts against the limiting part I to achieve limiting. At this time, the hinge axis of the supporting member, the axis of the wheel disc, and the tangent line between the pressing end and the outer peripheral wall of the wheel disc are in the same plane. Therefore, the distance between the hinge axis of the supporting member and the axis of the wheel disc is equal to the sum of the distance from the hinge axis of the supporting member to the tangent line between the pressing end and the outer peripheral wall of the wheel disc and the distance from the axis of the wheel disc to the tangent line between the pressing end and the outer peripheral wall of the wheel disc. At this time, the distance from the hinge center of the supporting member to the center of the wheel disc is the largest, and the supporting member abuts against the outer peripheral wall of the wheel disc to achieve support. Therefore, during the process of lifting the goods, the pawl and the ratchet wheel do not contact each other, and no "clicking" sound will be emitted. Moreover, the end face of the supporting member and the outer peripheral wall of the wheel disc are in surface contact, and the generated frictional abnormal sound is also relatively small. After the lifting is completed, the main shaft is rotated reversely for a small circle. The friction between the wheel disc and the end face of the supporting member can drive the supporting member to swing downward relative to the pawl to restore it to the initial state, and the pawl is re-engaged with the ratchet wheel under the action of the elastic member to achieve locking.

[0009] The winch of the present application is provided with a wheel disc on the main shaft, and a long strip-shaped supporting member is hinged on the pawl. Through such a simple structural combination, and by reasonably utilizing the elastic member that already exists between the pawl and the machine frame, the engagement and disengagement between the pawl and the ratchet wheel during the lifting process are realized, the noise is eliminated, the wear between the two is avoided, and the service life is prolonged. Moreover, the improvement of this structure does not require a large adjustment of the overall component layout of the winch. The structure is simple, the improvement cost is low, and the engagement and disengagement are realized by controlling the swing of the pawl by using the frictional inertia between the supporting member and the outer peripheral wall of the wheel disc. The stability is good and it is not easy to fail.

[0010] Preferably, in the above-mentioned winch, the top support member is in the shape of a rectangular plate, and a strip-shaped groove is further formed on the outer peripheral wall of the wheel disc. The edge of the pressing end of the top support member can be embedded in the strip-shaped groove under the action of the elastic member, and when the top support member swings to abut against the first limiting portion, the end face of the pressing end of the top support member presses against the outer peripheral wall of the wheel disc. In the initial state, the edge of the pressing end of the top support member presses against the outer peripheral wall of the wheel disc under the action of the elastic force. As the wheel disc rotates, the edge of the pressing end of the top support member can be caught in the strip-shaped groove. During the continuous rotation of the wheel disc, the inner wall of the strip-shaped groove can more easily drive the top support member to swing relative to the pawl and push the pawl to swing outwards away from the ratchet until the top support member abuts against the first limiting portion for limiting. At this time, the end face of the pressing end of the top support member presses against the outer peripheral wall of the wheel disc to achieve top support, and the pawl and the ratchet are in a separated state. Therefore, through the design of the strip-shaped groove, the rotation of the wheel disc can more easily drive the silk thread of the top support member to swing, and the friction force between the top support member and the wheel disc can be made relatively smaller, further reducing noise and wear. Preferably, arc-shaped convex portions protruding outwards are provided on both side walls at the hinge joint of the top support member and the pawl.

[0011] In the above-mentioned winch, the pawl further has a second limiting portion. When the edge of the pressing end of the top support member presses against the outer peripheral wall of the wheel disc or is embedded in the strip-shaped groove, the top support member can abut against the second limiting portion. The design of the second limiting portion can further limit the swing of the top support member relative to the pawl, avoiding the top support member from swinging too much and disengaging from the wheel disc after the pawl resets and engages with the ratchet, resulting in failure.

[0012] In the above-mentioned winch, the pawl is hinged to the frame through a first hinge shaft. One side of the pawl further has an annular convex portion. The convex portion is arranged around the first hinge shaft. One side of the convex portion has a notch, and the two edges of the notch respectively form the above-mentioned first limiting portion and the second limiting portion. The first limiting portion and the second limiting portion respectively limit the swing amplitude of the top support member in the clockwise and counterclockwise directions, avoiding excessive swing and causing failure, so as to effectively control the engagement and disengagement between the pawl and the ratchet. At the same time, the first limiting portion and the second limiting portion are integrally formed on the pawl, reasonably improving and utilizing the structure of the hinge joint of the pawl itself, without adding additional components, without making major adjustments to the overall component layout of the winch, with a simple structure and low improvement cost. Preferably, a flared relief portion is further provided at the edge of the notch of the convex portion to make way for the arc-shaped convex portion of the top support member to avoid interference.

[0013] In the above winch, the edges of the top pressure end of the supporting member are chamfered, and the inner wall of the strip groove is arc-shaped. Through the setting of the chamfered corners and the coordination of the arc-shaped inner wall, when the wheel rotates counterclockwise, the inner wall of the strip groove can more easily and smoothly drive the supporting member to swing upward relative to the pawl and push the pawl to swing outward to disengage from the ratchet wheel, and the friction noise generated between the two is also smaller and can be almost ignored.

[0014] In the above winch, there are a plurality of strip grooves evenly distributed along the outer peripheral wall of the wheel disc, and the two ends of the strip grooves penetrate to the two end surfaces of the wheel disc. Through the above arrangement, when lifting goods, when the wheel disc rotates, the supporting member can be timely inserted into the strip groove, thereby driving the supporting member to swing upward and outward to support the pawl, realizing the separation of the pawl and the ratchet wheel, eliminating noise, and avoiding wear between the two, thereby extending the service life.

[0015] Preferably, in the above-mentioned winch, the opening edge of the strip groove has a protruding rib. During the counterclockwise rotation of the wheel disc, the design of the rib can better provide a fulcrum to push the top support member to swing upward and push the pawl to swing outward to disengage from the ratchet wheel until the end surface of the top support member presses against the outer peripheral wall of the wheel disc.

[0016] As a further preference, in the above-mentioned winch, the cross section of the rib is trapezoidal. The rib is arranged in a trapezoidal shape, which can better provide driving force for the swing of the top support member while having a better guiding effect, so that the top support member can swing upward more smoothly until the end surface is pressed against the outer peripheral wall of the wheel disc, thereby more smoothly controlling the clutch of the pawl and the ratchet wheel without generating additional abnormal noise.

[0017] In the above winch, the opening edge of the strip groove is connected to the outer peripheral wall of the wheel disc by a circular arc transition. The above arrangement facilitates the support member to be inserted into or removed from the strip groove, thereby swinging to support the pawl, completing the clutch between the pawl and the ratchet wheel, eliminating noise, and avoiding wear between the two, thereby extending the service life.

[0018] In the above-mentioned winch, the end surface of the pressing end of the supporting member is an inwardly concave arc surface, and when the supporting member swings to abut against the limiting portion, the end surface of the pressing end presses against the outer peripheral wall of the wheel disc. The end surface of the pressing end of the supporting member is an arc surface, so that the end surface of the pressing end of the supporting member can maintain contact with the outer peripheral wall of the wheel disc when pressing against it. Under the action of the elastic force of the elastic member and the friction inertia of the wheel disc rotating counterclockwise, the end surface of the pressing end of the supporting member can always maintain contact with the outer peripheral wall of the wheel disc to achieve stable supporting, and the two have a high degree of contact, and the friction noise generated is also small.

[0019] In the above-mentioned winch, the transmission mechanism includes a first gear integrally formed on a wheel disc and a second gear fixed on a winch drum. The first gear meshes with the second gear. The outer diameter of the wheel disc is greater than the outer diameter of the first gear. The first gear and / or the wheel disc are threadedly connected to the main shaft. The brake assembly further includes a brake disc connected to the main shaft. The ratchet is sleeved on the main shaft, and the wheel disc and the brake disc are respectively located on both sides of the ratchet. Brake pads are provided between the ratchet and the wheel disc and between the ratchet and the brake disc. When it is necessary to tow or lift a load, the rope on the winch drum is hooked and fixed to the load. The main shaft rotates counterclockwise. Initially, the wheel disc can move relatively to the right along the main shaft under the action of the thread to clamp and lock the ratchet and the brake disc. Subsequently, it rotates counterclockwise together with the main shaft, driving the winch drum to rotate clockwise to contract the rope and lift the load. When it is necessary to lower the load, the main shaft is rotated clockwise. The ratchet remains stationary under the action of the pawl. Relative rotation occurs between the main shaft and the wheel disc. The wheel disc moves leftward under the action of the thread to loosen the brake pads. Thereafter, under the action of the gravity of the load, the wheel disc can rotate clockwise by a small circle and move rightward to re-clamp the brake pads and the brake disc, driving the winch drum to rotate counterclockwise by a small circle, and the load is lowered by a certain distance. By repeating the above actions, the load can be lowered smoothly and slowly. The wheel disc and the first gear are integrally formed, with good overall structural stability, reducing the frictional losses and wear between components, and having better stability in clamping and locking with the brake disc.

[0020] Compared with the prior art, the present winch has the following advantages:

[0021] 1. Through the simple structural combination of the wheel disc and the top support member and by making use of the elastic pressure structure existing in the pawl itself, the clutch control between the pawl and the ratchet during the hoisting and lowering of the load is realized, eliminating noise, avoiding wear between the two, and extending the service life. The improvement of the structure does not require major adjustments to the overall component layout of the winch, with a simple structure and low improvement cost.

[0022] 2. By driving the top support member to swing through the inner wall of the strip-shaped groove to push the pawl to swing for clutch operation, it has good stability, is not easily ineffective, and can make the frictional force between the top support member and the wheel disc relatively smaller, further reducing noise and wear. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structure diagram when the upper side edge of the pressing end of the top support member of the present winch presses against the outer wall of the wheel disc.

[0024] Figure 2 It is a three-dimensional structure diagram when the upper side edge of the pressing end of the top support member of the present winch is embedded in the strip-shaped groove.

[0025] Figure 3It is a three-dimensional structure diagram when the end face of the pressing end of the top support member of this winch presses against the outer side wall of the wheel disc.

[0026] Figure 4 It is a sectional view of this winch.

[0027] Figure 5 It is a three-dimensional structure diagram of the top support member.

[0028] Figure 6 It is a three-dimensional structure diagram of the wheel disc.

[0029] Figure 7 It is Figure 6 The enlarged view of part A in

[0030] Figure 8 It is a three-dimensional structure diagram of the winch drum.

[0031] Figure 9 It is a three-dimensional structure diagram of the pawl.

[0032] In the figure, 1 is the frame; 2 is the main shaft; 3 is the winch drum; 4 is the brake assembly; 4a is the ratchet wheel; 4b is the pawl; 4b1 is the convex part; 4b1a is the first limiting part; 4b1b is the second limiting part; 4b1c is the notch; 4c is the brake disc; 4d is the brake pad; 5 is the elastic member; 6 is the wheel disc; 6a is the strip-shaped groove; 6b is the rib; 7 is the transmission mechanism; 7a is the first gear; 7b is the second gear; 8 is the top support member; 9 is the first hinge shaft. Specific implementation manner

[0033] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0034] As Figures 1-9 As shown, this winch includes a frame 1, a main shaft 2, a winch drum 3, a top support member 8 and a brake assembly 4. The main shaft 2 and the winch drum 3 are both rotatably connected to the frame 1 and the main shaft 2 and the winch drum 3 are connected by a transmission mechanism 7. The transmission mechanism 7 includes a first gear 7a and a second gear 7b. The first gear 7a is threadedly connected to the main shaft 2, the second gear 7b is fixed on the winch drum 3, the outer diameter of the first gear 7a is smaller than the outer diameter of the second gear 7b and the two are meshed. A dust cover covering the second gear 7b is also fixed on the winch drum 3.

[0035] As Figure 4As shown, the brake assembly 4 includes a pawl 4b, a ratchet wheel 4a, a brake disc 4c, two brake pads 4d, and a wheel disc 6. The brake disc 4c is sleeved on the main shaft 2 and is circumferentially positioned and axially limited. The first gear 7a is integrally formed on one side of the wheel disc 6, and the outer diameter of the wheel disc 6 is greater than the outer diameter of the first gear 7a. The ratchet wheel 4a and the two brake pads 4d are both sleeved on the main shaft 2. The wheel disc 6 and the brake disc 4c are respectively located on both sides of the ratchet wheel 4a. The two brake pads 4d are respectively located between the ratchet wheel 4a and the wheel disc 6 and between the ratchet wheel 4a and the brake disc 4c. The pawl 4b is hinged to the frame 1, and there is an elastic member 5 between the pawl 4b and the frame 1 that keeps the pawl 4b always in a meshing tendency with the ratchet wheel 4a. In this embodiment, the elastic member 5 is a torsion spring, and the ratchet wheel 4a can rotate counterclockwise relative to the pawl 4b.

[0036] Specifically, a strip-shaped groove 6a is further formed on the outer peripheral wall of the wheel disc 6. There are several strip-shaped grooves 6a and they are evenly distributed along the outer peripheral wall of the wheel disc 6. Both ends of the strip-shaped groove 6a penetrate to the two end faces of the ratchet wheel 4a. The pawl 4b is hinged to the frame 1 through a first hinge shaft 9. One side of the pawl 4b also has an annular convex portion 4b1. The convex portion 4b1 is arranged around the first hinge shaft 9. One side of the convex portion 4b1 has a notch 4b1c. The two edges of the notch 4b1c respectively form a first limiting portion 4b1a and a second limiting portion 4b1b. A flared relief portion is also provided at the edge of the notch 4b1c. The top support member 8 is in the shape of a rectangular plate. The middle of the top support member 8 is hinged to the pawl 4b through a second hinge shaft. On both side walls of the hinged portion of the top support member 8 and the pawl 4b, there are outwardly protruding arc-shaped convex portions for structural reinforcement. The arc-shaped convex portions are opposite to the relief portion. The end of the top support member 8 close to the wheel disc 6 is a pressing end. The edge of the pressing end is pressed against the outer peripheral wall of the wheel disc 6 under the elastic force of the elastic member 5, and when the upper side edge of the pressing end of the top support member 8 rotates through the wheel disc 6, it can be embedded into the strip-shaped groove 6a under the action of the elastic member 5. When the edge of the pressing end of the top support member 8 is pressed against the outer peripheral wall of the wheel disc 6 or embedded into the strip-shaped groove 6a, the top support member 8 can abut against the second limiting portion 4b1b, and the pawl 4b and the ratchet wheel 4a remain meshed. When the top support member 8 swings to abut against the first limiting portion 4b1a, the distance from the hinge center of the top support member 8 to the center of the wheel disc 6 is the largest. At this time, the end face of the pressing end of the top support member 8 is pressed against the outer peripheral wall of the wheel disc 6, and the pawl 4b and the ratchet wheel 4a are separated.

[0037] Furthermore, as Figures 5-7As shown, the upper edge of the pressing end of the top support member 8 is rounded, and the inner wall of the strip groove 6a is arc-shaped. The opening edges on both sides of the strip groove 6a are flared, and the opening edges on both sides of the strip groove 6a are connected to the outer peripheral wall of the wheel disc 6 in a circular arc transition, which has a good guiding effect. The opening edges on both sides of the strip groove 6a are provided with protruding ribs 6b, the length direction of the ribs 6b is consistent with the thickness direction of the wheel disc 6, and the cross section of the ribs 6b is trapezoidal. The end face of the pressing end of the top support member 8 is an inwardly concave arc surface, so that the end face of the pressing end of the top support member 8 can maintain fit when it is pressed against the outer peripheral wall of the early wheel disc 6.

[0038] Working principle of the winch: Take the winch placed horizontally for example. In the initial state, the upper edge of the top pressure end of the top support member 8 presses against the outer peripheral wall of the wheel disc 6, and the top support member 8 abuts against the second limit portion 4b1b. The top support member 8 is in a downward tilted state relative to the hinge. Figure 1 When the cargo is to be dragged or hoisted, the rope on the winch 3 is hooked and fixed on the cargo, and the main shaft 2 is rotated counterclockwise. The thread drives the wheel disc 6 to move rightward and press against the brake pad 4d to clamp and lock the ratchet 4a and the brake disc 4c. The first gear 7a, the wheel disc 6, the brake pad 4d, the ratchet 4a and the brake disc 4c rotate counterclockwise together with the main shaft 2. At the same time, as the wheel disc 6 rotates counterclockwise, the upper side of the pressing end of the supporting member 8 can be inserted into one of the strip grooves 6a, as shown in FIG. Figure 2 As shown. The wheel 6 continues to rotate counterclockwise, the upper rib 6b of the inner wall of the strip groove 6a can drive the supporting member 8 to swing upward relative to the pawl 4b and push the pawl 4b to swing outward to separate from the ratchet 4a until the end surface of the supporting member 8 presses against the outer peripheral wall of the wheel 6 to achieve supporting. At this time, the supporting member 8 abuts against the limiting portion 4b1a, and the supporting member 8 is in a horizontal state or in a state where the pressing end is tilted upward. Under the elastic force of the elastic member 5 and the friction inertia of the counterclockwise rotation of the wheel 6, the pressing end surface of the supporting member 8 can always keep pressing against the outer peripheral wall of the wheel 6 to achieve supporting. The pawl 4b is separated from the ratchet 4a. Figure 3As shown. Continuing to rotate the rotating shaft counterclockwise, the winch 3 is driven to rotate by the cooperation of the first gear 7a and the second gear 7b to shorten the rope and lift the goods. During the entire lifting process, the pawl 4b and the ratchet 4a do not contact each other, and there will be no "clicking" sound. Moreover, the end face of the top support member 8 and the outer peripheral wall of the disk 6 are in surface contact, and the frictional abnormal noise generated is also small. After the lifting is completed, rotate the main shaft 2 clockwise for a small circle. Due to the frictional force between the disk 6 and the end face of the top support member 8, the top support member 8 can be driven to swing downward relative to the pawl 4b so that its edge presses against the outer peripheral wall of the disk 6 again. The pawl 4b is re-inserted into the ratchet 4a under the action of the elastic member 5 to achieve locking. When lowering the goods, rotate the main shaft 2 clockwise. The ratchet 4a remains stationary under the action of the pawl 4b. The main shaft 2 and the disk 6 rotate relative to each other. The disk 6 moves leftward by a certain distance under the action of the thread to loosen the brake pad 4d. Thereafter, under the action of the gravity of the goods, the disk 6 can rotate clockwise for a small circle and move rightward to re-clamp the brake pad 4d and the brake disc 4c to be clamped and locked, thereby driving the winch 3 to rotate counterclockwise for a small circle, and the goods are lowered by a certain distance. Repeat the above actions to smoothly and slowly lower the goods.

[0039] In the winch of the present application, a disk 6 is provided on the main shaft 2, and a long strip-shaped top support member 8 is hinged on the pawl 4b. Through such a simple structural combination, and by reasonably utilizing the elastic member 5 existing between the pawl 4b and the frame 1 itself, the engagement and disengagement between the pawl 4b and the ratchet 4a during the lifting process are realized, the noise is eliminated, the wear between the two is avoided, and the service life is prolonged. Moreover, the improvement of this structure does not require a large adjustment of the overall component layout of the winch. The structure is simple, the improvement cost is low, and the engagement and disengagement are realized by controlling the swing of the pawl 4b by using the frictional inertia between the top support member 8 and the outer peripheral wall of the disk 6, with good stability and not easy to fail.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although terms such as frame 1, main shaft 2, winch 3, brake assembly 4, ratchet 4a, pawl 4b, convex portion 4b1, limiting portion one 4b1a, limiting portion two 4b1b, opening 4b1c, brake disc 4c, brake pad 4d, elastic member 5, disk 6, strip-shaped groove 6a, rib 6b, transmission mechanism 7, first gear 7a, second gear 7b, top support member 8, hinge shaft one 9, etc. are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A winch, comprising a frame (1), a main shaft (2), a winch drum (3) and a brake assembly (4). The main shaft (2) and the winch drum (3) are both rotatably connected to the frame (1), and the main shaft (2) and the winch drum (3) are connected by a transmission mechanism (7). The brake assembly (4) includes a pawl (4b) hinged to the frame (1) and a ratchet wheel (4a) connected to the main shaft (2), and there is an elastic member (5) between the pawl (4b) and the frame (1) to keep the pawl (4b) always in a meshing tendency with the ratchet wheel (4a). It is characterized in that, A wheel disc (6) is also sleeved on the main shaft (2), and the main shaft (2) can drive the wheel disc (6) to rotate. A strip-shaped top support member (8) is hinged to the pawl (4b). The pressing end of the top support member (8) abuts against the outer peripheral wall of the wheel disc (6), and the rotation of the wheel disc (6) can drive the top support member (8) to swing. The pawl (4b) also has a first limiting portion (4b1a). When the top support member (8) swings to abut against the first limiting portion (4b1a), the distance from the hinge center of the top support member (8) to the center of the wheel disc (6) is the largest. A strip-shaped groove (6a) is also formed in the outer peripheral wall of the wheel disc (6). The edge of the pressing end of the top support member (8) can be inserted into the strip-shaped groove (6a) under the action of an elastic member (5). When the top support member (8) swings to abut against the first limiting portion (4b1a), the end face of the pressing end of the top support member (8) abuts against the outer peripheral wall of the wheel disc (6). The edge of the pressing end of the top support member (8) is provided with a rounded corner. The inner wall of the strip-shaped groove (6a) is arc-shaped, and a protruding rib (6b) is provided at the opening edge of the strip-shaped groove (6a).

2. The winch according to claim 1, characterized in that, The top support member (8) is in the shape of a rectangular plate.

3. The winch according to claim 2, wherein, The pawl (4b) also has a second limiting portion (4b1b). When the edge of the pressing end of the top support member (8) abuts against the outer peripheral wall of the wheel disc (6) or is inserted into the strip-shaped groove (6a), the top support member (8) can abut against the second limiting portion (4b1b).

4. The winch according to claim 3, characterized in that, The pawl (4b) is hinged to the frame (1) through a first hinge shaft (9). A ring-shaped convex portion (4b1) is also provided on one side of the pawl (4b). The convex portion (4b1) is arranged around the first hinge shaft (9). A notch (4b1c) is provided on one side of the convex portion (4b1). The two edges of the notch (4b1c) respectively form the above-mentioned first limiting portion (4b1a) and second limiting portion (4b1b).

5. The winch according to claim 2 or 3 or 4, characterized in that, There are several strip-shaped grooves (6a) which are evenly distributed along the outer peripheral wall of the wheel disc (6). The two ends of the strip-shaped groove (6a) penetrate through to the two end faces of the wheel disc (6).

6. The winch according to claim 2 or 3 or 4, characterized in that, The cross section of the rib (6b) is trapezoidal.

7. The winch according to claim 2 or 3 or 4, characterized in that The opening edge of the strip-shaped groove (6a) is connected to the outer peripheral wall of the wheel disc (6) by an arc transition.

8. The winch according to claim 1 or 2 or 3 or 4, characterized in that, The end face of the pressing end of the top support member (8) is a concave arc surface.

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