FIELD: mechanical engineering, possible use in precise mechanics devices for transmitting given driving torque, and also as means for protecting mechanical transmission from rotation elements, exceeding allowed value.
SUBSTANCE: in accordance to invention, device consists of body, driving shaft, set of spring-loaded friction elements, in turns connected to body and driving shaft with possible axial movement, springs and elements for controlling their force. Materials of components of sleeve structure are selected so that in force closed circuit of parts, as closing link of which springs are used, some elements, for example, friction set, have greater coefficient of temperature expansion in comparison with other parts of force circuit, and total change of geometric dimensions during change of temperature of construction additionally compresses springs, for example, during heating, or partially tempers them, for example, during cooling, compensating temperature changes of friction coefficient.
EFFECT: simplified construction, namely of mechanical part of unit for "automatic temperature stabilization of value of momentum being transmitted" due to selection of sleeve part materials, decreased dimensions, weight and industrial costs of sleeve manufacture.
2 cl, 2 dwg
The invention relates to mechanical engineering and can be used in devices of precise mechanics for transmission to the specified torque, and is also a means of protection mechanical transmission of torques in excess of the allowable value.
Known friction clutch (see A.S. SU 1108268 And class F16D 13/75, F16D 7/02), containing mounted on the shaft housing, the push and platter package leading and trailing friction discs disposed between the housing and the pressure disk spring installed between the pressure and the supporting disks, additional disk drive, additional springs are installed between the secondary and pressure disks, and the node control efforts more springs, the site of the adjustment efforts of additional springs are made in the form attached to the shaft at one end of the bimetallic element and corrective Cam, kinematically associated with the free end of the bimetallic element and mounted on the shaft can be rotated, with an additional disk mounted on the shaft movably in the axial direction and is connected with a working profile adjustment Cam.
In the known coupling device automatic temperature stabilization of the magnitude of the transmitted torque by adjusting the pressure of the efforts acting on the friction disks through the Yu termoliticheskogo element, acting on the Cam, kinematically associated with the springs acting on the disk is a complex node, optionally loaded friction losses in the axis of rotation of the adjustment Cam on its end surfaces in the transmission of axial force.
The aim of the present invention is to simplify the design, namely the mechanical part of the site "automatic temperature stabilization of the magnitude of the transmitted torque" due to selection of materials of the parts of the coupling, reducing size, weight and production cost of its manufacture.
This goal is achieved by the fact that in the proposed friction clutch, comprising a housing, a drive shaft, a set of spring-loaded friction elements serially connected with the housing and the drive shaft for axial movement, a spring installed between the pressure and the supporting disks, the adjustment efforts of the springs, the material of the structure elements of the coupling chosen so that the power closed circuit parts, closing link which are spring elements, for example, friction kit, has a greater coefficient of thermal expansion compared to other parts of the power circuit, and the total change of the geometric dimensions when the temperature of the structure, additionally compresses p. the dinners, for example, during heating, or partially releases, for example, cooling, compensating for temperature changes of the coefficient of friction.
This should be achieved is proportional to the pressure change efforts springs, commensurate with the change in the coefficient of friction due to selection of the total thickness of the stack of disks with a large coefficient of thermal expansion.
To enhance the effect of compensation, when increasing the number of disks is undesirable in the chain of transmission of force of the springs to a set of frictional elements may be placed in the insert of heat-sensitive material, the dimensions of which are selected in accordance with characteristics of the springs.
1 shows a friction clutch, the section; figure 2 is a friction clutch with an insert of heat-sensitive material, the cut.
The clutch consists of a housing 1 with internal splines and external ring gear to transmit torque, set of frictional elements: led 2 is provided with external teeth crowns for connection with the internal splines of the housing 1 and the leading 3rd internal gear ring for connection with the splines of the drive shaft 4. Spring 5 located between the support 6 and the push-open 7 disks provide the preload friction elements through the pushers 8. The adjustment efforts of springs carried by the nut 9. Insert from thermocast the positive material 10 may optionally be placed, for example, in a special pocket made in the support 11.
The clutch operates as follows: the torque is transmitted from the drive shaft 4 through the slots leading friction elements 3 using friction between the leading 3 and slave 2 the friction elements, then through the slots on the housing 1.
When exceeding the torque of the friction elements are rotated relative to each other, preventing the transmission and other mechanisms associated with the clutch.
The friction of the friction elements (leading 3 and slave 2) clutch transmitting torque, should be strictly regulated by the selection of materials of friction pairs and adjusting the springs 5, as the clutch does not turn off, and runs continuously as an element of the transmission, but slips only if the maximum allowable torque.
In most pairs of friction static friction is significantly different from dynamic, which excludes the accuracy limit the transmitted torque due to slippage of the coupling halves relative to each other.
The pair of friction, in which there is no "failure" of the transmitted torque when the "breakaway", i.e. at the beginning of the slippage of the coupling caused by the difference of static and dynamic friction, is, for example, fluoroplastic-4 - steel. The friction of PTFE-4 is small, and its increase is achieved by an increase to the number of pairs of friction, and the coefficient of linear expansion of fluoroplast-4 higher coefficient of linear expansion of steel.
This combination of coefficients of linear expansion, reducing geometrical dimensions, and friction coefficient, increasing the friction for PTFE-4, when the temperature drops design, allow for relatively precise limitation of the torque by automatically reducing the preload of the spring 5 when the temperature of the structure.
When the temperature decreases, the coefficient of friction between the leading 3 and slave 2 the friction elements, in our example, increases, but the entire set of frictional elements is reduced more than it decreases the drive shaft 4, on which is located the supporting disk 6, which is the focus for springs 5, and the pushers 8 with pressure disk 7, on the one hand, and the support disk 12 and the tightening nut 13, with the other hand. The installation height of the springs increases, reducing the pressure on the friction elements, as a result, the torque remains constant.
Thus, reducing the size of the metal part of the structure when cooled less reduction fluoropolymers second set of frictional coupling elements, where a large amount of PTFE friction elements is significant, the total length of the power circuit of the springs, there is a war affecting the geometric dimensions are pressed to contact springs. In the linear dimension of the mounting location of the springs, as the difference of the lengths of metal and PTFE parts, cooling increases, and the force decreases, compensating for the increase in the coefficient of friction of PTFE when cooled.
When the temperature changes go in the opposite direction.
Figure 2 shows the design of a friction clutch with an insert 10 from a material with a large coefficient of linear expansion, which works similarly, but this insert allows you to more accurately and more fully to ensure the effect of the compensation values of the limiting torque with changing temperature.
Thus, in the proposed construction is made possible without additional devices to use for automatic temperature control of the magnitude of the transmitted torque mutual influence of structural elements with different coefficients of thermal expansion, where the thickness of the friction (polymer) set is of sufficient magnitude, the temperature changes which directly affect the force of the springs.
This property is reinforced by the introduction of a new element, namely the compensation box, enabling a more precise use of changing the geometry of the elements of design for proportional, sozleri the CSOs effects of change efforts springs on the change in friction when the temperature changes.
1. A friction clutch, comprising a housing, a drive shaft, a set of spring-loaded friction elements serially connected with the housing and the drive shaft for axial movement, a spring installed between the pressure and the supporting disks, the adjustment efforts of springs, wherein the materials of the structure elements of the coupling chosen so that the power closed circuit parts, closing link which are spring elements, such as friction set has a greater coefficient of thermal expansion compared to other parts of the power circuit and the total change of the geometric dimensions when the temperature designs additionally compresses the spring, for example, when heating or partially releases, for example, cooling, compensating for temperature changes of the coefficient of friction.
2. A friction clutch according to claim 1, characterized in that the chain transfer efforts springs to a set of frictional elements, placed the insert of thermally sensitive material.
FIELD: mechanical engineering.
SUBSTANCE: friction compensating safety clutch comprises two clutch members and disks that are secured to the clutch members and provided with central and peripheral openings. The peripheral openings cooperate with the balls enclosed into the rubber separator. The compensating member is a fastening member made of spherical washers and mounted in the central opening in the disks and separator. The fastening member is a bolt with a nut.
EFFECT: expanded functional capabilities.
2 cl, 2 dwg
FIELD: mechanical engineering.
SUBSTANCE: arm-piece is fastened to pulley by means of bolt. Arm-piece has straight slit. Pulley with arm-piece are mounted for slide relatively friction nave of driven shaft which has disk provided with spiral-shaped slot. One magnet is fixed to disk of driven shaft. Other magnet is connected with straight slit of arm-piece through spiral-shaped of disk and is mounted for getting closer to first magnet slippage of clutch. Work signaling device is made in form of magnetically operated sealed switch which closes signaling electric circuit from influence of two magnets which magnets have opposite polarities.
EFFECT: improved precision of determination of time moment for clutch adjusting.
FIELD: electrical engineering; magnetic clutches with engageable permanent-magnet rotors and conductors separated by air gaps.
SUBSTANCE: proposed magnetic clutch has first and second shafts with parallel axes of revolution; case or wiring unit disposed on first shaft about its axis of revolution; permanent-magnet rotor disposed on second shaft and passed into case in radial direction from second shaft; two electricity conducting parts resting on case or wiring unit for displacement and separated from magnets with air gaps on opposite ends of rotor; as well as air gap adjusting device designed for controlling axial position of electricity conducting parts of conductors in axial direction relative to case and for random variation of air gaps.
EFFECT: simplified design and facilitated servicing due air-gap adjustment system easy-to-use on site upon clutch installation.
24 cl, 4 dwg
FIELD: mechanical engineering.
SUBSTANCE: clutch-brake comprises air cylinder (4) secured to hub (1) and made of two parallel rigidly interconnected disks (8) and brake (9). Driving disk (16) with friction members (17) and driven disk (14) whose sleeves (23) receive brake springs (22) cooperate with disk (8) on command. Driving disk (18) with friction members (19) and driven disk (15) mounted in space (3) of air cylinder (4) cooperate with disk (9). Disk (14) of clutch and disk (15) of brake are mounted on movable pins (13) set in bushings (12) in through openings (11) made in air cylinder (4). The special adjusting movable nut is mounted on the smaller threaded end (29) of each movable pin (13). The outer side of the nut is provided with open dummy ring space that receives the stack of flat measuring ring washers. The outer washer from the stack and outer side of the nut cooperate with stop washer (36) that is locked on pin (13) by means of the lock nut.
EFFECT: simplified structure, enhanced reliability of operation, and prolonged service life.
FIELD: mechanical engineering.
SUBSTANCE: clutch-brake comprises braking springs (27) mounted in sleeves (28) of the driven pressing disk of the unit for engaging clutch-brake (29) and in the adjustable sleeves (30) of the driven bearing finned disk for engaging clutch-brake (24) of the clutch. The clutch-brake is locked by means of splines (31). Movable intermediate combined disk (34) of the clutch is mounted for permitting free movement in axial direction over the ring surface of cylindrical part (35) of the threaded sleeves which projects out of the driven bearing finned disk of the unit for engaging clutch-brake (24) of the clutch. The bearing disk of the brake comprises bearing disk of brake (10) that is rigidly connected to the face of movable rim (11) by means of screws. The movable rim is connected with the unmovable rim of L-shaped air cylinder (4) by means of threaded connection (9). The cylinder receives piston (7) of the clutch-brake. The projecting part of the left side of the surface of piston (7) is provided with radial through grooves (33) that receive bottoms (32) of all sleeves (28) of braking springs (27) of driven pressing disk for engaging clutch-brake (29) for permitting movement. The face of ring part of piston (7) is in a permanent contact with the side of the driven pressing disk of the unit for engaging clutch-brake (29) of the engaging unit. The face of threaded rim (11) of the bearing disk of brake (10) of the brake is provided with through radial grooves. Two diametrically opposite grooves receive rectangular slides (13) for permitting reciprocation. The slide can lock rim (11) after adjustment.
EFFECT: improved design.
1 cl, 4 dwg
FIELD: mechanical engineering.
SUBSTANCE: clutch member comprises two independent pressing disks which are axially movable by control means. Each of the pressing disks co-operates with the corresponding clutch disks. An adjusting device is interposed between the control means and one of the pressing disks, which is used for compensating wearing out of friction facings and providing the position of the control means unchangeable in the closed condition of the clutch member throughout the service life. The clutch member can additionally have the energy storage for loading at least one clutch disk. The adjusting device for compensating wear of friction facings is interposed between the energy storage and pressing disk, which contributes to the axial movement of the pressing disk with respect to the energy storage.
EFFECT: simplified design and enhanced reliability.
64 cl, 14 dwg
FIELD: transport mechanical engineering.
SUBSTANCE: disengaging clutch comprises driving and driven friction disks. The surfaces of the friction disks are provided with projections and hollows which are arranged over concentric circumferences with respect to the axis of rotation and are wavy in cross-section.
EFFECT: enhanced torque transmission.