A clutch transmission device and its manufacturing method

Abstract

The invention discloses a clutch driving device and a manufacturing method thereof. The driving device comprises a driving shaft, a driving disc, more than two groups of driving sheets, a driven disc and an electric control device, wherein the driving disc and the driven disc are provided with circumferential outer rings and arranged on the driving shaft; the electric control device comprises an electromagnet assembly consisting of an electromagnet core and a coil, wherein the electromagnet assembly is arranged in a cavity formed by the circumferential outer ring of the driving disc and is directly or indirectly pivoted with the driving shaft in a pivoting manner; each driving sheet comprises a bulge part made of a non-magnetic material, an arc-shaped part fixedly connected with the bulge part and made of a magnetic material, and an arc-shaped friction sheet fixedly connected with the outer surface of the arc-shaped part; the driving sheets are movably connected with the driving disc through pin shafts; the arc-shaped friction sheets are opposite to the inner wall of the circumferential outer ring of the driven disc; when the electromagnet assembly is electrified, a gap exists between each arc-shaped friction sheet and each inner wall. According to the clutch driving device and the manufacturing method thereof, the power-on and power-off control drive is realized by improving the precisions of various constituent components, simplifying various component structures and connection relationships and ensuring a favorable driving effect.

Description

technical field [0001] The invention relates to the technical field of torque transmission, in particular to a clutch transmission device for controlling cooling fans, water pumps, air pumps and other components of an automobile engine. The present invention also relates to a method of manufacturing the above-mentioned clutch transmission. Background technique [0002] At present, the electromagnetic fan clutch used in automobiles controls the speed of the fan according to the change of the water temperature of the engine, so as to keep the automobile engine in the best state during operation. Specifically, by controlling the energization or power-off of the coil on the electromagnet core to control the attraction and separation of the suction plate on the magnet fixed plate or the fan fixed plate and the transmission plate, thereby controlling the speed of the fan on the fan fixed plate to achieve The effect of making the fan cool down the engine at an appropriate speed. ...

AI Technical Summary

Problems solved by technology

[0007] ① A separate drive cylinder 107' is set, and three sets of fixed plates 120' at one end are fixed on the fan fixed plate 109' by fastening bolts 118'. This structure not only adds a component to the traditional electromagnetic fan clutch, but also increases the The relative weight and relative axial size are limited, and the connection method is also inconvenient in technology. It is not suitable for some occasions with strict installation space requirements.

When the radial magnetic field lines generated by the electromagnet core 103' enter the transmission piece 106', the transmission piece 106' is made of a magnetically conductive material as a whole, and the transmission disc 102' is also made of a magnetically conductive material, and the transmission piece 106' passes through the The pin shaft 124' is hinged on the protrusion 117' at the circumferential position of the transmission disc 102', and the two protrusions are stuck under the action of the magnetic field lines, making it difficult for the transmission plate 106' to swing

[0009] ③Because the drive disc 102' and the drive plate 106' are made of magnetically permeable material as a whole, and the circumferential position of the drive disc 102' is provided with a magnetic separation groove 122', the radial magnetic field lines generated by the electromagnet core 103' first pass from the drive disc 102 One side of the 'upper magnetic isolation groove 122' passes through and enters the drive piece 106', then passes through the other side of the upper magnetic isolation groove 122' of the drive plate 102' through the drive plate 106', and finally returns to the shaped electromagnet core 103 ' into a closed magnetic force line, the magnetic force line is a primary circuit, the utilization rate is low, and the attraction force generated by the transmission piece 106' is relatively small, and there is still room for improvement

[0010] ④Because the fan fixed plate 109' is usually made of low-strength materials such as aluminum or plastic casting, its relative strength is low and it is not wear-resistant, so there is a potential safety hazard in the connection strength between the connection with the fan blade and the connection with the drive cylinder 107'

Using higher strength materials such as stainless steel or copper increases cost and weight

[0011] ⑤Because the transmission plate 106' swings away from or close to the circumferential position of the transmission disc 102' with the pin shaft 124' as the center, the transmission plate 106' only rotates at the pin shaft 124' without radial displacement, and the transmission plate 106' The radial displacement of the free end of the free end is the largest, and the first to be close to the transmission disc 102' means that the free end of the friction plate 106'a wears first, and the degree of wear gradually decreases with the end close to the pin shaft 124', causing the friction plate 106' The degree of wear of a varies, which affects the stability and comprehensive service life of the entire mechanism

[0012] ⑥Since the transmission plate 106' is only supported by the pin shaft 124', the pin shaft 124' must not only resist the centrifugal force generated when the transmission plate 106' rotates with the transmission disc 102', but also resist the friction plate 106'a and the transmission cylinder. 107', etc., and due to the narrow space, the structural size of the pin shaft 124' cannot be too large. Under these multiple alternating loads, it is easy to exceed the fatigue limit of the material and cause deformation or even fracture. The safety and comprehensive service life of the whole mechanism, more importantly, because it is a single point support, if the rotation direction of the transmission disc 102' is from the pin shaft 124' to the free end of the transmission plate 106', the friction plate 106' a is opposite to the direction of the friction force generated between the drive cylinder 107', and there is a certain length of resistance arm between the friction force and the pin shaft 124' as the fulcrum, so the same resistance needs to be "closed" and transmitted to the fulcrum pin through the drive plate Shaft, when the resistance is large enough, it will cause violent shaking and locking, which will affect the stability of the whole device, and serious consequences will occur such as pin shaft, transmission plate fracture, transmission cylinder rupture, etc.

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