JPH04121537U - centrifugal clutch - Google Patents

Abstract

(57) [Summary] [Purpose] Among power transmission devices, centrifugal clutches use centrifugal force to connect and disconnect power, and the internal mechanism of the clutch is not strained even at a much larger deflection angle than when using only rubber bushings. This can extend the life of the clutch. [Structure] A metal spring is interposed between the drive shaft and the clutch body to absorb the deflection angle between the drive shaft and the driven shaft.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on a centrifugal crank in a power transmission device that uses centrifugal force to intermittent power. This is related to the

0002

[Conventional technology]

The types of centrifugal clutches are roughly divided into dry type and wet type, but mechanically there are friction plate type and hydraulic type. There are a wide variety of types, including type and electric type. However, in any type of mechanism, the tolerance for misalignment between the drive shaft and driven shaft is very small. Even those using rubber have a diameter of 0.1 mm or less, and most require strict alignment. This is because excessive misalignment can cause fatal damage to the clutch body. many.

0003 Figure 3 shows a conventional example of a dry type, friction shoe type, centrifugal clutch that uses rubber as a cushioning material. show. In this type, the torque fluctuation between the drive shaft 01 and the driven shaft 02 is absorbed by the rubber 03. Although the main purpose is to keep the rubber 03 in place, small misalignments can be absorbed by the rubber 03. However, since the permissible limit of misalignment is determined by the durability of Rubber 03, Design tolerance limits exist. If misalignment exceeding this allowable limit is applied, it will lead to fatigue failure of the rubber. This may lead to serious damage to the clutch body.

0004 The purpose of this invention is to greatly improve the allowable limit of this misalignment. In particular, the structure allows use over a wider range of use than conventional products, where the angle of deviation between the drive shaft and driven shaft is greater than that of conventional products. It has the following. The misalignment we are talking about here has two meanings, the first of which is shown in Figure 4. One is due to parallel displacement of the drive shaft 01 and driven shaft 02 (distance due to parallel displacement of the shaft center). The other one is due to the declination angle of the drive shaft 01 and driven shaft 02 shown in Fig. 5. .

[0005]

[Problem that the idea aims to solve]

In dry type/friction shoe type centrifugal clutches, a rubber bush is attached to the support part of the centrifugal weight. By using it as a buffer material, it absorbs the shock during intermittent operation and the torque fluctuation during operation. It has a structure that allows However, since the direction of motion of the centrifugal weight is only the radial direction, the drive shaft and When the driven shaft is deflected, the rubber bushing experiences a radial force and further axial shear. Due to the shearing force applied, the durability of the rubber is significantly reduced.

[0006]

[Means to solve the problem]

This invention solves the above-mentioned conventional problems, and has a metal connection between the drive shaft and the clutch body. This is a centrifugal clutch that uses a metal spring to absorb the deviation angle between the drive shaft and driven shaft. In other words, the present invention uses a structure that can absorb the deviation angle using a separate mechanism, and avoids applying excessive load to the rubber. By not burdening the clutch, the durability of the rubber can be kept within the permissible limit, and the clutch The purpose is to expand the range of use of . This structure uses metal springs to absorb the deflection angle, and is used as a cushioning material. The rubber bush handles only the original loads such as torque fluctuations, so The durability of the design can be guaranteed. In this type of clutch, the friction limit of the shoe and the durability of the rubber must match. Ideally, if there is a deviation angle, the life of the rubber may be the life of the clutch. be.

[0007]

[Effect]

When there is an angle of deviation between the drive shaft and driven shaft of a dry friction shoe type centrifugal clutch. After connection, the centrifugal weight moves in the same way as the driven shaft, so there is no difference between the centrifugal weight and the drive side. Relative displacement will be repeated every rotation. This displacement is at the support part of the centrifugal weight. Since it will hang on a certain rubber bush, the rubber bush will be affected by the radial displacement. Both will be simultaneously subjected to a shearing force in a direction perpendicular to this.

[0008] In this type of clutch, the clutch body is attached to the drive shaft using a sensor. There are two types: a data-mounted type and a peripheral-mounted type, but they have a structure that absorbs deviation angles. The clutch body is supported via metal springs according to each type. This allows for a much larger deflection angle than with just a rubber bushing. Moreover, it is possible to extend the life of the clutch.

[0009]

【Example】

As the first embodiment of the present invention, Fig. 1 shows an example of a center-mounted clutch. . 1 is a drive shaft, 2 is a driven shaft, and 3 is a rubber bush. There is a diaphragm between the outer periphery of the drive side flywheel 4 and the shaft of the clutch body 5. Attach the clutch body via the spring 6. Since the diaphragm spring 6 can be easily deformed on the central axis side due to its flexibility, The flywheel 4 and the clutch body 5 can be angled. For this reason, the After latched connection, even if there is an angle of deviation between the drive shaft 1 and the driven shaft 2, the clutch body 5 will be driven. By fitting well with the side drum 7, unreasonable loads are not applied to the internal mechanism of the clutch body 5. Don't burden yourself. This reduces the burden on rubber bush 3, which is the weakest part of the clutch. This means that the life of the clutch will be extended.

0010 As a second embodiment of the present invention, FIG. 2 shows an example of a peripherally attached type clutch. The idea of interposing a spring between the drive-side flywheel 4 and the clutch body 5 is based on the first example. Same as the example, but in this case, a plurality of leaf springs 8 having an angle in the circumferential direction are used. Ru.

[0011] One end of the leaf spring 8 is attached to the drive side flywheel 4, and the other end is attached to the clutch body 5. By attaching it to the plate spring 8, the deflection angle between the drive shaft 1 and the driven shaft 2 is absorbed. The operating principle is the same as in the first embodiment.

0012 The above two types of metal springs undergo repeated deformation each time they rotate, so the spring Fatigue strength and fixed parts where stress is concentrated must be designed with sufficient margin for fatigue strength. must be

[0013]

[Effect of the idea]

Absorbs the deflection angle of the driven shaft of the drive shaft in dry type/friction shoe type centrifugal clutches. A centrifugal clutch that eliminates the need for strict center alignment is constructed by using a spring that With this method, even if an unexpected declination angle is applied during use, the Since no stress is placed on the internal mechanism of the switch, it has the effect of allowing you to expect the specified design life. do.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a center-mounted type device according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a peripheral mounting type according to a second embodiment of the present invention;

FIG. 3 is a structural diagram showing a conventional centrifugal clutch.

FIG. 4 is an explanatory diagram of misalignment (parallel movement of the axis).

FIG. 5 is an explanatory diagram of a misalignment (deviation angle) situation.

[Explanation of symbols]

1 Drive shaft 2 Driven shaft 3 Rubber bushing 4 Flywheel 5 Clutch body 6 Diaphragm spring 7 Drum 8 Leaf spring

Claims (1)

[Scope of utility model registration request] 1. A centrifugal clutch characterized in that a metal spring is interposed between a drive shaft and a clutch body to absorb the deviation angle between the drive shaft and the driven shaft.