CN2077930U

CN2077930U - Double-directioned overstep clutch of ratchet type

Info

Publication number: CN2077930U
Application number: CN 90205959
Authority: CN
Inventors: 徐启
Original assignee: CHAOBAI RIVER ENERGY SAVING AP
Current assignee: CHAOBAI RIVER ENERGY SAVING AP
Priority date: 1990-05-10
Filing date: 1990-05-10
Publication date: 1991-05-29

Abstract

The utility model provides a double-directioned overstep clutch of ratchet type, belonging to a transmission moment. The utility model comprises a working section and an operation section. The working section comprises a pawl bed whose both sides are respectively fixed with a flange and a positioning plate. The end surface of the positioning plate is fixedly provided with drill fixing joints. The hole on one end of the flange is provided with an elastic drill joint, and a ratchet pawl, and the both sides of the ratchet pawl gets contact with the drill fixing joints and elastic drill joints. The cross-section of the ratchet pawl forms an arc wedge shape, and the tail section of the ratchet pawl forms a half cylinder shape. The bidirectional ratchet wheel is connected with the flange through a bearing. The operation section comprises a heart-shaped cam, an anchor-shaped cam wheel and a maneuvering ring sheathed on the flange. The clutch is big in transmission torsional moment, high in limit speed and reliable and flexible in working.

Description

Double-directioned overstep clutch of ratchet type

The utility model belongs to transmission part, particularly free wheel device.

Shortcomings such as existing clutch adopts roller-type overrunning clutch, and it is little that it exists transmitting torque, and limit speed is low, application area is restricted, therefore, in order to enlarge using scope, is necessary to provide a kind of performance good, the free wheel device that mechanical wear is little.

It is good that the purpose of this utility model provides a kind of performance, has bi-directional moment of torsion and double rolling key clutch, and the wearing and tearing of this clutch are little.

For achieving the above object, the utility model adopts following structure: clutch comprises working portion and operative section.Working portion comprises: pawl base (1), (1) both sides fix with flange (8), positioning plate (3) respectively, the positioning plate end face is fixed with fixed cone joint (4), flexible awl joint (6) in the flange end face, and joint spring (7) is pressed in movable awl joint afterbody; Ratchet (5), its both sides contact with fixed cone joint (4), elasticity awl joint (6) respectively, and the ratchet section is the arc wedge shape, and the ratchet afterbody is half-cylindrical; Be connected by bearing (10), (13) between two-way ratchet (2) and flange (8), described operative section comprises: be contained in the camshaft (19) in the flange plate axial bore, the axle the side of being, two ends tenon, two ends respectively with heart-shaped cam (18), anchor shape cam (16) on square hole tightly rivet; Be enclosed within the trundle (17) of heart-shaped cam end; Be enclosed within the control loops (11) on the flange, between control loops and flange, be embedded with drag chain (12); Shift fork (21), its end insert to be handled in the annular groove, and the other end is enclosed within on the declutch shift shaft; The steel ball positioning means.

Because pawl base and ratchet are assembled together by flange and bearing, can do relative movement, by the ratchet transmitting torque, both master and slave relations are any, when transmitting torque, elastic joint retreats, and moment of torsion is directly acted on the pawl base by the ratchet afterbody, because the cancellation pawl axis, allowable stress is not limited by pawl axis intensity.During manipulation, shift fork drives control loops and axially moves, and three axial working positions of control loops drive anchor shape cam by the trundle on the heart-shaped cam through camshaft, become three operating angles.Anchor shape cam working face directly acts on the ratchet, and when surmounting motion, elastic joint becomes the ratchet gyration center under the spring force effect, controls the friction torque in joint by adjusting the joint spring, makes ratchet rotate flexibility and reliability.

The utility model advantage is: adopt ratchet, pawl type structure, the ratchet section is the arc wedge shape, improved resistance to flexure, the ratchet afterbody is a semi-cylindrical, match with corresponding inner cylinder on the pawl base, improve contact strength, replace pawl axis with the elastic cone joint, can transmit big moment, improve limit speed.

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Fig. 1: ratchet bidirectional free wheel device structural representation

Fig. 2: during the bi-directional moment of torsion, the ratchet phase diagram

Fig. 3: heart-shaped cam position on control loops when corresponding with Fig. 2 state

Fig. 4: ratchet phase diagram when surmounting motion counterclockwise

Fig. 5: heart-shaped cam position on control loops when corresponding with Fig. 4 state

Fig. 6: ratchet phase diagram when surmounting motion clockwise

Fig. 7: heart-shaped cam position on control loops when corresponding with Fig. 6 state

Fig. 8: arc awl wedge shape pawl structures schematic representation

Among Fig. 1, (1) is pawl base, (1) both sides respectively with flange (8), positioning plate (3) fixes, the positioning plate end face is fixed with fixed cone joint (4), flexible awl joint (6) in the flange end face, joint spring (7) is pressed in elasticity awl joint afterbody, (5) be ratchet, its both sides respectively with fixed cone joint (4), elasticity awl joint (6) contacts, the ratchet section is the arc wedge shape, the ratchet afterbody is half-cylindrical, between two-way ratchet (2) and flange (8) by bearing (10), (13) connect, (14), (15) be respectively bearing outer separator and inner spacing collar, (9) be that (pawl base is active to bearing gasket, two-way ratchet is driven), (19) be camshaft, it is contained in the flange plate axial bore, the side of being, the two ends tenon of axle, two ends respectively with heart-shaped cam (18), square hole tight riveting on the anchor shape cam (16), (17) for being enclosed within the trundle (17) of heart-shaped cam end, (11) for being enclosed within the control loops on the flange, have groove on the control loops, one end of shift fork (21) inserts in the groove of control loops, the shift fork the other end is enclosed within on the declutch shift shaft, shift fork is done axial displacement along declutch shift shaft, the shift fork displacement drives control loops and does axial motion, control loops displacement (three axial working positions are arranged) along the drag chain (12) that is embedded between flange and the control loops, by the trundle (17) on the heart-shaped cam (18), driving anchor shape cam (16) through camshaft (19) becomes three operating angles.Anchor shape cam working face directly affacts on the ratchet (5).(22), (23), (24) among the figure are respectively shift fork location set screw, retaining spring, locking ball.

Close riveting connects.Among Fig. 2, anchor shape cam is in the neutral position, and forward and reverse ratchet all falls between hook tooth, can two-way transmission moment of torsion, and be used for automobile and advance or move backward, Fig. 3 represents the relative position of groove and trundle on the control loops.

Among Fig. 4, anchor shape cam is rotated counterclockwise limit position, and oppositely ratchet is lifted, and the forward ratchet drives ratchet and rotates.When the Operating torque disappearance, inertial force makes the ratchet rotating speed surpass pawl base, and ratchet is thrown off, and ratchet is done to surmount motion, is used for automobile running, and it is long apart from sliding, to reach fuel-efficient purpose to utilize inertia to do.

Among Fig. 8, L equals the 4m(modulus for ratchet length), R equals footpath in the ratchet, ratchet working depth h=m(modulus for the center radius of arc), α is for boring joint angle between 60 °～90 °.

Claims

1, a kind of ratchet bidirectional free wheel device, it is characterized in that it is made up of working portion, operative section, described working portion comprises: pawl base [1], [1] both sides fix with flange [8], positioning plate [3] respectively, the positioning plate end face is fixed with fixed cone joint [4], flexible awl joint [6] in the flange end face, joint spring [7] are pressed in movable awl joint afterbody; Ratchet [5], its both sides contact with fixed cone joint [4], elasticity awl joint [6] respectively, and the ratchet section is the arc wedge shape, and the ratchet afterbody is half-cylindrical; Be connected by bearing [10], [13] between two-way ratchet [2] and flange [8], described operative section comprises: be contained in the camshaft [19] in the flange plate axial bore, the axle the side of being, two ends tenon, two ends respectively with heart-shaped cam [18], anchor shape cam [16] on square hole tightly rivet; Be enclosed within the trundle [17] of heart-shaped cam end; Be enclosed within the control loops [11] on the flange, between control loops and flange, be embedded with drag chain [12]; Shift fork [21], its end insert to be handled in the annular groove, and the other end is enclosed within on the declutch shift shaft; The steel ball positioning means.

2, by the described clutch of claim 1, it is characterized in that described steel ball positioning means is set screw (22), retaining spring (23), locking ball (24).