JPH0336739Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cone clutch.

A cone clutch has a cone cup with an inner circumferential surface of the cone and a cone body with an outer circumferential surface of the cone, and for example, by sliding the cone body, it is brought into frictional contact with the other cone cup. . In this case, for example, the cone body on the side to be slid is attached to the transmission shaft via a helical spline, and due to the action of the helical spline, the transmitted torque generates a force that presses the cone body toward the cone cup. do. Therefore,
If the transmitted torque fluctuates, this pressing force will fluctuate.Especially in the low rotation range of a diesel engine where torque fluctuations are large, when the transmitted torque decreases, the pressing force also decreases, so the cone body moves away from the cone cup. This causes slippage, which accelerates the wear of the frictional contact surfaces, and sometimes results in failure of insertion due to this torque variation. The same thing happens when an overload is applied; in this case as well, the two move away from each other and slip, and these slips have the disadvantage of impairing durability. The purpose of the present invention is to prevent such slippage during torque fluctuations or overload, thereby improving the durability of the clutch, and preventing the clutch from becoming unfittable due to torque fluctuations.

In this type of cone clutch, there is one in which a spring is provided on the back surface of the cone body on the side opposite to the side on which it is slid (see Japanese Patent Publication No. 38-3159).
However, the spring in this conventional design is
When the engine experiences torque fluctuations or overloads, the cone cup is moved backward against the biasing force of the spring, causing a slip between both clutch bodies, thereby eliminating such torque fluctuations and overloads. This is something that is designed to absorb water, which is contrary to the purpose of the present invention, only promotes slipping, and conversely reduces durability, which is completely different from the present invention. It is.

In addition, in this type of cone clutch, if both clutch bodies are not completely separated when in neutral, the driven side will rotate, resulting in the inconvenience of not being able to maintain a completely neutral state. However, the spacing between the two clutch bodies is merely maintained by a spring, and the clutch bodies cannot be kept completely separated from each other, and there is a possibility that the clutch bodies may cause rotation. Furthermore, the above conventional spring is
Although a coil spring is used, since the spring is arranged to protrude from the back surface of the clutch body, the overall length becomes correspondingly longer, which has the disadvantage that it cannot be assembled compactly. That is, the object of the present invention is to provide a cone clutch that eliminates these drawbacks, prevents rolling by completely releasing both clutch bodies when in neutral, and also makes the whole cone clutch compact. It is also aimed at

In order to achieve the above object, in this invention, a clutch body having an inner circumferential surface of a cone and a clutch body having an outer circumferential surface of a cone are attached to a transmission shaft, and one of the clutch bodies is slidably operated. These cone clutches transmit power by bringing the inner circumferential surface of the cone and the outer circumferential surface of the cone into frictional contact with each other, and the transmission torque at the time of power transmission presses one clutch body toward the other clutch body. The other clutch body is slidably fitted onto the transmission shaft via a helical spline acting in the direction, and the other clutch body which is not slidably operated is connected between thrust collars attached to the transmission shaft on both sides of the other clutch body. In addition to being able to slide in the axial direction within the gap between the thrust collar and the rear side of the other clutch body, it acts to press the other clutch body against the one clutch body during power transmission. A disc spring or a plate spring is provided to ensure that both clutch bodies are always in contact with each other, and the disc spring or plate spring is disposed in a recess formed on the back surface of the other clutch body. do.

The structure of the present invention will be described below based on an illustrated embodiment. FIG. 1 shows an example of this type of cone clutch. In the figure, reference numeral 1 denotes a clutch case, and an input shaft 2 and an output shaft 3 are mounted on the clutch case 1 in parallel with each other. A pair of cone cups 5, 5 having cone inner peripheral surfaces 4, 4 are attached to the output shaft 3 in an idling state, and teeth 6, 6 formed on the outer periphery of the cone cups 5, To the teeth 7, 7 formed on the shaft 2,
One is directly connected to the other through an idler gear (not shown). On the other hand, on the output shaft 3, in the middle between the cone cups 5, 5,
A cone body 9 serving as one clutch body of the present invention is provided with cone outer circumferential surfaces 8, 8 facing the cone inner circumferential surfaces 4, 4 of the cone cups 5, 5, respectively, and is slidable via a helical spline 10. By sliding the cone body 9 in the axial direction, the outer circumferential surface 8 of the cone is brought into frictional contact with the inner circumferential surface 4 of one cone of the cone cup 5.

In contrast to the clutch structure shown in Fig. 1 above, Fig. 2 shows the following:
This shows an embodiment in which a disc spring of the present invention is provided on the back side of the cone cup 5. In the same figure, the cone cup 5 has front and rear thrust collars 11, 1.
2 through a bearing 13, but there is a gap 14 between it and the thrust collar 11 on the back side.
In this range, the cone cup 5 can slide in the axial direction.
Further, a recess 15 extending in the circumferential direction is formed on the back surface of the cone cup 5, and a support base 16 supported by the back thrust collar 11 is formed on the wall surface of the recess 15 on the radially inward side. A disc spring 17 is interposed between the support base 16 and the back surface of the recess 14 in a state in which the cone cup 5 is pushed toward the back side and slides. , this corn cup 5
The structure is such that it acts to push the cone body 9 toward the other clutch body, that is, the cone body 9. That is, the cone body 9
When the cone cup 5 is slid and inserted into the cone cup 5 side, the cone cup 5 is pushed and slid toward the back side as shown in FIG. The repulsive force of the spring 17 acts to push the cone cup 5 toward the cone body 9 side. Even if the pressing force of the cone body 9 decreases due to torque fluctuations and the cone body 9 moves in the direction away from the cone cup 5, the repulsive force of the disc spring 17 will increase accordingly. Since the cone cup 5 follows the cone cup 5 to compensate for the force, the drawbacks such as slippage due to torque fluctuations or failure to insert can be eliminated. In this case, as shown in Fig. 3, under normal power transmission conditions, the cone cup 5 is tightly supported by the thrust collar 11 on the rear side, and when the torque increases due to torque fluctuation or an overload occurs, However, the cone cup 5 cannot retreat any further and always maintains a secure contact with the cone body 9 without slipping. Therefore, this spring 17 is in such a state that the cone cup 5 does not move away from the other cone body 9 in the normal power transmission state, and only when the cone body 9 moves in the direction away from the other cone cup 5. The cone body 9 follows the movement of the cone body 9 and is set in such a state that it is always pressed.

FIG. 4 shows another embodiment of the present invention,
In this embodiment, a leaf spring 1 is attached to a thrust collar 11 which is provided on the back side of the cone cup 5 and also serves as a support stand.
8 is attached so that the plate spring 18 performs the same function as the disc spring 17. Further, if the cone cup 5 side is to be slid and inserted into the cone body 9 side, a similar elastic body is provided on the cone body 9 side.

FIG. 5 shows the measurement of the rotational speed at which slippage occurs due to torque fluctuations in a conventional clutch with no elastic body and a cone clutch with the elastic body of the present invention. As can be seen from this figure, in the case of the present invention, the rotation range where slipping occurs is much lower, and it can be seen that it is significantly improved.

In addition, by combining a plurality of elastic bodies such as the disc springs 17 and plate springs 18 shown in Figs. 3 to 5, and changing the spring constant depending on the stroke instead of a constant spring constant, it is possible to prevent sudden insertion during insertion. By relaxing the clutch with a spring and supporting it with the above-mentioned strong spring after fitting, it is possible to obtain an ideal clutch that does not have a fitting shock and does not slip even under low load and high torque.

As mentioned above, in this invention, since both clutch bodies are provided with springs that maintain sufficient pressing force at all times, there is no slippage due to torque fluctuation or overload, and durability is improved. This also eliminates the drawback of not being able to fit. Furthermore, the spring-biased clutch body can only slide within the range of the thrust collars provided on both sides of the clutch body, and therefore, even when in neutral, the clutch body is closer to the mating clutch than the thrust collars. It does not move to the side of the body, and it is possible to reliably prevent it from moving around when in neutral.
In addition, in this invention, the spring on the back of the clutch body is
Since it is disposed in a recess formed on the back surface of the clutch body, the overall length is shortened accordingly, resulting in a compact structure.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of a cone clutch, Fig. 2 is an enlarged longitudinal cross-sectional view of main parts showing an embodiment of the present invention implemented in the cone clutch shown in Fig. 1, and Fig. 3 is an action of the elastic body. An enlarged longitudinal sectional view of the main parts showing the
FIG. 4 is an enlarged longitudinal cross-sectional view of a main part showing another embodiment of the present invention, and FIG. 5 is a graph showing the results of measuring the rotational speed at which slippage occurs based on fluctuations in transmitted torque. 5... Cone cup, 4... Cone inner peripheral surface, 9
... Cone body, 8 ... Cone outer peripheral surface, 11, 12
... Thrust collar, 14 ... Gap, 15 ... Recess, 17 ... Belleville spring, 18 ... Leaf spring.

Claims (1)

[Scope of utility model registration request] A clutch body having an inner circumferential surface of a cone and a clutch body having an outer circumferential surface of a cone are attached to a transmission shaft,
A cone clutch that transmits power by slidingly operating one clutch body to bring the inner circumferential surface of the cone and the outer circumferential surface of the cone into frictional contact with each other,
The one clutch body is slidably fitted onto the transmission shaft through a helical spline through which the transmission torque during power transmission acts in the direction of pressing the clutch body toward the other clutch body, and the other clutch body, which is not slidably operated, is slidably fitted onto the transmission shaft. The clutch body can be slid in the axial direction between the thrust collars attached to the transmission shaft on both sides of the other clutch body, within the range of the gap between the thrust collars, and the rear side of the other clutch body A disc spring or plate spring is provided on the side of the disc spring, which is set to work to press the other clutch body against the one clutch body during power transmission to ensure that both clutch bodies are always in contact with each other, and the disc spring or A cone clutch characterized in that the leaf spring is disposed within a recess formed on the back surface of the other clutch body.