Shoe block with simple structure and bidirectional rotating centrifugal clutch

Abstract

The utility model discloses a shoe block with a simple structure and a bidirectional rotating centrifugal clutch. The shoe block comprises a shoe block body, the shoe block body is of a bilaterally symmetrical structure and comprises an inner side convex part with a trapezoidal horizontal cross section, and a first support lug and a second support lug are symmetrically arranged on the two sides of the inner side convex part; the first support lug and the second support lug have the same structure; the utility model further discloses a bidirectional rotating centrifugal clutch comprising the shoe block structure. The shoe block is simple in structure, integrally formed, simple in machining process, convenient to assemble and beneficial to reducing the machining cost of the shoe block and the clutch; due to the bilaterally symmetrical structure of the shoe blocks, the movement direction is less prone to external force under the action of centrifugal force, and efficient power transmission of bidirectional rotation can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal clutch technical field, concretely is a simple structure's shoe block and centrifugal clutch. BACKGROUND

[0002] Centrifugal clutch is a kind of element that power transmission is given to mechanical device, it utilizes centrifugal force to transmit power, when engine crankshaft speed is higher, shoe block structure in centrifugal clutch can generate a centrifugal force that is away from center in rotation process, make it and the friction of outer cover inner surface, carry out power transmission to the gearbox connected with outer cover, when engine crankshaft speed is lower, under the tension of tension spring, shoe block structure is separated from outer cover, cuts off power transmission.

[0003] The existing shoe block structure is generally fixed by fixed hinge pin and driving disc, as shown in Figure 1 Fixed hinge pin 1 is arranged at one side of shoe block structure 2, occupies the side space of shoe block structure, causes tension spring 3 to be only set at the inner side of fixed hinge pin 1, makes the whole shoe block structure complex, and the production process is complicated, and the parts are more, and the assembly efficiency of centrifugal clutch is low, so that the production cost is higher.In addition, shoe block structure rotates unidirectionally and opens with fixed hinge pin as center, when rotating clockwise, power transmission can be normal, when rotating counterclockwise, power transmission will be greatly affected.

[0004] Therefore, we propose a simple structure's shoe block structure and bidirectional rotation centrifugal clutch to solve the problems proposed in the above. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a simple structure's shoe block structure and bidirectional rotation centrifugal clutch to solve the problems of high machining cost and low counterclockwise transmission efficiency caused by complex shoe block structure in prior art proposed in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: a simple structure's shoe block, including shoe block body, the shoe block body is the structure that is symmetrical left and right,

[0007] The shoe block body includes the inner side convex part of horizontal cross section trapezoidal, the inner side convex part both sides are equipped with by first ear and second ear, the first ear and second ear structure are same.

[0008] To ensure that shoe block always keeps along the outward movement of the center under the action of centrifugal force, the inner side convex part includes front end face, left side and right side, and the vertical angle between the left side and the right side and the front end face is 15 °-30 °.

[0009] To facilitate the placement of shoe block in the corresponding position of driving disc when installing shoe block, the front end face is arc face.

[0010] In order to ensure that the tension of the tension spring acting on the lug is balanced and large enough, the first lug is provided with one or a plurality of first tension spring mounting holes arranged in an up-down parallel mode;

[0011] The second lug is identical in structure to the first lug, and correspondingly, the second lug is provided with a second tension spring mounting hole corresponding to the position of the first tension spring mounting hole.

[0012] In order to prolong the service life of the shoe block, a friction consumable piece with a shape adapted to the outer surface of the shoe block body is attached to the outer circumferential surface of the shoe block body.

[0013] Specifically, the edge of the inner side surface of the first lug is connected with the edge of the left side surface, the edge of the inner side surface of the second lug is connected with the edge of the right side surface, and the outer side surface of the first lug and the outer side surface of the second lug are connected through the outer circumferential surface of the shoe block body; more preferably, in order to reserve sufficient installation space for the tension spring, the outer side surface of the first lug and the outer side surface of the second lug are both arc surfaces outwardly rounded.

[0014] A bidirectional rotary centrifugal clutch comprises a driving disc, characterized in that the driving disc comprises the shoe block, a plurality of the shoe blocks are connected in a head-tail mode through tension springs to form a closed loop, and are arranged around the outer circumference of the driving disc.

[0015] The driving disc is provided with a clamping groove corresponding to each shoe block on the outer circumference, the left side surface of the clamping groove is adapted to the shape of the left side surface of the inner side protrusion, and the right side surface of the clamping groove is adapted to the shape of the right side surface of the inner side protrusion.

[0016] Preferably, the utility model also comprises a cover, the driving disc and the shoe block are arranged in the cover, the driving disc is located at the center position, the three shoe blocks are connected in a head-tail mode through tension springs and are arranged around the outer circumference of the driving disc, and the outer circumferential surface of the shoe block is gap-fitted with the inner circumferential surface of the cover.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The shoe block of the utility model has simple structure, the inner side protrusion is arranged in the middle, the inner side protrusion is matched with the driving disc, the left and right side inclined surfaces of the inner side protrusion are arranged, the centrifugal movement direction of the shoe block is limited, the basic function of the shoe block is realized, the left and right side position spaces of the shoe block are left, the tension spring mounting lug can be arranged, the whole structure is left-right symmetrical, is integrally formed, the processing technology is simple, and the assembly is simple, the production cost of the shoe block and the centrifugal clutch can be greatly reduced.

[0019] 2.The clutch of the utility model utilizes the left and right side surfaces of the inner protruding part of the shoe block structure to match the clamping groove of the driving disc, constructs the surface of the smooth contact of the outer circumference of the shoe block and the driving disc, can fix the relative position of the driving disc and the shoe block structure, and can ensure that the shoe block always moves outward along the center direction under the action of the centrifugal force due to the limitation of the clamping groove on the left and right side surfaces, so that the movement of the shoe block is not limited by the side fixed hinge pin, and therefore the efficiency of power transmission is very high whether the clutch rotates clockwise or counterclockwise. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the shoe block structure in the prior art.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the shoe block structure in the utility model.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the centrifugal clutch in the utility model.

[0023] Figure 4 It is an exploded structural schematic diagram of the centrifugal clutch in the utility model.

[0024] In the drawings:

[0025] 1, the fixed hinge pin in the prior art; 2, the shoe block structure in the prior art; 3, the tension spring in the prior art;

[0026] 10, shoe block body; 11, inner protruding part; 12, first supporting lug; 13, second supporting lug; 11a, front end surface; 11b, left side surface; 11c, right side surface; 12a, first tension spring mounting hole; 14, friction wear material sheet; 100, shoe block; 200, driving disc; 300, tension spring; 400, housing. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. EMBODIMENT

[0028] As shown in the drawings, Figures 2-4 The utility model provides a simple structure's shoe block, including shoe block body;The shoe block body is the structure of left and right symmetry, the shoe block body includes the inner protruding part 11 that horizontal cross section presents trapezoidal, the inner protruding part both sides symmetry is equipped by first supporting lug 12 and second supporting lug 13;First supporting lug 12 and second supporting lug 13 structure are same.

[0029] The inner side protrusion 11 comprises a front end surface 11a, a left side surface 11b and a right side surface; the vertical included angle between the left side surface and the front end surface is 15-30 degrees, and in the embodiment, the vertical included angle between the left side surface and the front end surface is 25 degrees, and the included angle between the left side surface and the right side surface is 50 degrees.

[0030] In some embodiments, in order to facilitate the assembly of the shoe block structure and the driving disc, the front end surface 11a is an arc surface.

[0031] In some embodiments, the first lug 12 is provided with one or a plurality of first tension spring mounting holes 12a in an up-and-down parallel manner; the second lug 13 is the same as the first lug 12, and correspondingly, the second lug 13 is provided with a second tension spring mounting hole corresponding to the position of the first tension spring mounting hole 12a. In the embodiment, two first tension spring mounting holes are provided on the first lug, and two second tension spring mounting holes are provided on the second lug, and each shoe block is connected by two tension springs in an up-and-down parallel manner, so as to ensure the rapid reset of the shoe block in a low-speed state.

[0032] In some examples, a friction consumable piece 14 with a shape adapted to the shape of the outer surface is attached to the outer circumferential surface of the shoe block body 10, so that the friction consumable piece 14 is in contact and friction with the cover 400, and the service life of the shoe block 100 can be prolonged.

[0033] In some examples, specifically, the edge of the inner side surface of the first lug 12 is connected with the edge of the left side surface 11b; the edge of the inner side surface of the second lug 13 is connected with the edge of the right side surface; the outer side surface of the first lug 12 and the outer side surface of the second lug 13 are connected through the outer circumferential surface of the shoe block body 10, and the entire shoe block is an integral structure, which is simple and symmetrical and has low processing cost.

[0034] The utility model discloses, through the design of the shoe block as the structure of left and right symmetry, through the cooperation of the inner side protrusion and the driving disc, ensure that the movement direction of shoe block is always the direction of centrifugal force, the inner side protrusion left and right sides set up lug, set up tension spring mounting hole on the lug, be used for with tension spring assembly, connect a plurality of shoe blocks as a whole when low -speed rotation, tension spring will shoe block pull back, interrupt transmission, the whole shoe block structure shape is regular, simple structure, simple assembly, processing cost is low. Embodiment

[0035] As Figures 2 to 4 shown, embodiment 2 is a kind of centrifugal clutch applied example 1, specifically a kind of bidirectional rotation centrifugal clutch, including driving disc 200, including a plurality of above-mentioned shoe block 100, specifically, in the embodiment, shoe block 100 is set to three, three shoe blocks 100 are connected head-to-tail through three groups of tension springs 300 and form closed loop, surround the outer circumferential of driving disc 200.

[0036] The outer circumference of the driving disc 200 is provided with a clamping groove 20 corresponding to each shoe block, the left side surface of the clamping groove 20 is matched with the left side surface of the inner side protrusion 11 in shape, and the right side surface of the clamping groove 20 is matched with the right side surface of the inner side protrusion 11 in shape, so as to ensure that the clamping groove only limits the movement direction of the shoe block and does not apply additional pressure to the shoe block.

[0037] In some embodiments, the bidirectional rotation centrifugal clutch further comprises a cover 400, the driving disc 200 and the shoe blocks 100 are arranged in the cover 400, the driving disc 200 is located at the center position, the three shoe blocks 100 are connected in a head-to-tail mode by the tension spring 300 and are arranged around the outer circumference of the driving disc 200, and the outer circumferential surface of the shoe block 100 is gap-fitted with the inner circumferential surface of the cover 400.

[0038] Working principle: the utility model discloses a driving disc 200 is rotated at high speed through engine crankshaft, centrifugal force is generated in the process of driving disc 200 rotation, shoe block 100 in driving disc is moved to the outside of the circle center under the action of centrifugal force, because the left and right side surfaces of the inner side protrusion 11 of shoe block structure are matched with the clamping groove of driving disc 200, the condition of smooth contact of shoe block 100 and the outer circumference of driving disc 200 is built, and the relative position of driving disc 200 and shoe block 100 can be fixed, in addition, under the action of centrifugal force, the left and right side surfaces of shoe block 100 are limited by the limiting of clamping groove 20, always move outward along the direction of centrifugal force, so that shoe block 100 is away from driving disc 200, and the cover 400 is contacted, friction is generated, driving cover 400 is rotated, and transmission is realized.When the rotating speed of driving disc 200 drops, centrifugal force drops, the force of tension spring 300 exceeds centrifugal force, tension spring 300 drives shoe block 100 to be close to driving disc 200, shoe block 100 is separated from cover 400, power transmission is cut off, and cover 400 stops rotating.In the whole process, because no other lateral external force acts on the shoe block, whether clockwise rotation or counterclockwise rotation, the movement direction of the shoe block and the force generating movement will not change, so bidirectional rotation of the clutch can be realized.

[0039] Thus a series of work is completed, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0040] It is apparent for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the utility model is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A shoe of simple construction comprising a shoe body; characterised in that: The hoof block body (10) is a left-right symmetrical structure, which comprises an inner side protrusion (11) with a trapezoidal horizontal cross section, and first and second ears (12, 13) symmetrically arranged on both sides of the inner side protrusion.

2. A simple structure shoe block according to claim 1, characterized in that, The inner side protrusion (11) comprises a front end face (11a), a left side face (11b) and a right side face (11c), and the vertical angles between the left and right side faces (11b, 11c) and the front end face are 15-30°.

3. A simple structure shoe block according to claim 2, characterized in that, The front end face (11a) is an arc face.

4. A simple structure shoe block according to claim 1, wherein The first ear (12) is provided with one or a plurality of first tension spring mounting holes (12a) arranged in an upper and lower parallel manner; the second ear (13) is identical in structure to the first ear (12), and correspondingly, the second ear (13) is provided with a second tension spring mounting hole corresponding to the position of the first tension spring mounting hole (12a).

5. A simple structure shoe block according to claim 1, wherein The outer circumferential surface of the hoof block body (10) is attached with a friction consumable piece (14) with a shape matching that of the outer surface.

6. A simple structure shoe block according to claim 2, wherein The edge of the inner side face of the first ear (12) is connected to the edge of the left side face (11b), and the edge of the inner side face of the second ear (13) is connected to the edge of the right side face (11c); the outer side face of the first ear (12) and the outer side face of the second ear (13) are connected through the outer circumferential surface of the hoof block body (10).

7. A bidirectional rotary centrifugal clutch comprising a driving disc (200), characterized in that, The application further comprises a cover shell (400), wherein the driving disc (200) and the hoof blocks (100) are arranged in the cover shell (400), the driving disc (200) is located at the center, and three hoof blocks (100) are connected by tension springs and arranged around the outer circumferential surface of the driving disc (200), and the outer circumferential surface of the hoof block (100) is in clearance fit with the inner circumferential surface of the cover shell (400).

8. The bidirectional rotational centrifugal clutch of claim 7, wherein, ​

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