JPH0638178Y2 - Clutch spring seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spring seat for a clutch mounted on a vehicle.

(Prior Art) A clutch, which is interposed between an output shaft of a vehicle engine and an input shaft of a transmission to intermittently transmit power, has a simple structure, is easy to adjust and repair, and has a smooth intermittent connection. The dry-type single-plate friction clutch used in is widely adopted. As shown in FIG. 5, the clutch disc 1 of this dry single plate friction clutch (hereinafter simply referred to as a clutch) is
A hub plate 4 is interposed between a clutch plate unit 2 and a retaining plate unit 3 which are connected by a stopper pin 8, and the plate units 2 and 3 and the hub plate 4 are located at four opposing circumferential positions. The spring mechanism 5 is attached to the substantially rectangular spring holes 2a, 3a, 4a formed in the
Is fitted.

As shown in FIG. 6, each spring mechanism 5 is composed of a coil spring 6 and a pair of spring seats 7 arranged at both ends of the coil spring 6, and rotates together with the clutch plate unit 2 and the clutch plate unit 2. The torque fluctuation between the retaining plate unit 3 (hereinafter simply referred to as the clutch plate 2 etc.) and the hub plate 4 is absorbed in cooperation with the hysteresis mechanism 9.

More specifically, the four spring mechanisms 5 arranged in the circumferential direction of the clutch disc 1 are provided with a coil spring 6 having a small spring constant. First stage spring mechanism (FIG. 6 shows the first stage spring mechanism). And a second-stage spring mechanism having a large spring constant, and the spring hole 4a of the hub plate 4 into which the second-stage spring mechanism is fitted is circumferentially moved a predetermined number of times from the spring holes 2a, 3a of the clutch plate 2 or the like. It is formed to be large by the dynamic angle θ ₁ and therefore gives the clutch disc the torque transmission characteristics shown by the solid line in FIG. Immediately, in the first-stage spring characteristic region in which the relative rotation angle between the clutch plate 2 and the hub plate 4 is ± θ ₁ , only the coil spring 6 of the first-stage spring mechanism has a relative rotation angle of θ ₁ or more or the - [theta] ₁ following the second stage spring characteristic range is compressed coil spring of the first and second stage spring mechanism, a torque corresponding to the amount of compression is transferred.

(Problems to be solved by the invention) By the way, the clutch mounted on the vehicle is made common among the vehicle types in consideration of production efficiency. On the other hand, the drag resistance of the transmission connected to the hub plate 4 of the clutch disc 1 changes variously depending on the model (model) of the transmission and the oil temperature. The amount of torque transmission of the clutch at the time of engine idling fluctuates around the neutral point A that balances with the above-mentioned drag resistance and the like in the operation line shown by the solid line in FIG. Therefore, if the drag resistance of the transmission, that is, the rotation resistance of the hub plate 4, is large, the neutral point A approaches the second-stage spring characteristic region even when the engine is idling, and when torque fluctuation occurs, the transmission torque is reduced. It will fluctuate along the operating line between the first-stage spring characteristic region and the second-stage spring characteristic region. This fluctuation causes a noise, and there is a problem that the noise of the clutch increases.

As one of the methods for reducing the noise of the clutch, the preload of the coil spring 6 of the first stage spring mechanism is adjusted according to the drag resistance of the transmission so that the neutral point A is separated from the two stage spring characteristic range. A possible method is to set the position.

However, the above-mentioned conventional clutch spring seat 7
In, the preload of the coil spring 6 cannot be adjusted. Therefore, it is necessary to replace the spring seat or the coil spring according to the drag resistance of the transmission, which causes problems such as compatibility between the clutch and the transmission and poor versatility of parts.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a spring seat for a clutch capable of adjusting the preload of the coil spring according to the drag resistance of the transmission.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a spring seat for locking an end surface of a coil spring arranged along the circumferential direction of a clutch disc is provided with a spring seat for the coil spring. The seat height adjusting means for adjusting the spring length is provided.

(Operation) When the seat height of the spring seat is adjusted by the seat height adjusting means to shorten the spring length of the coil spring, the coil spring is more compressed and the preload is increased. On the contrary, if the spring length of the coil spring is increased by the adjusting means, the preload of the coil spring is reduced.

Embodiment An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
The same members as those shown in FIGS. 5 and 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a partially cutaway side view showing a spring seat of a clutch to which the present invention is applied. The spring seat 10 is a pedestal.
11, pedestal 11 consisting of locking piece 12 and lock nut 13
Is a clutch plate unit, a retaining plate unit (both not shown), and a bottom plate 11a that abuts against an edge of a spring hole 4a formed in the hub plate 4, and a coil spring 6 in the circumferential direction of the clutch from the bottom plate 11a. It is composed of a column portion 11b which is erected toward the side. A male screw as a seat height adjusting means is threaded on the peripheral surface of the cylindrical portion 11b.

The locking piece 12 is a cylindrical member having an inner peripheral surface on which a female screw as a seat height adjusting means is screwed, and a flange 12a is formed at an end of the pedestal 11 side. The locking piece 12 is screwed into the column portion 11b of the pedestal 11 and fixed by a lock nut 13 for preventing rotation.

The operation will be described below.

Loosen the lock nut 13 and attach the locking piece 12 to the column 11b of the pedestal 11.
On the other hand, if rotated, the distance l between the pedestal 11 and the locking piece 12 can be adjusted. When this distance 1 is increased, the spring length of the coil spring 6 is shortened by the amount of increase,
The preload of the coil spring 6 increases according to this spring length.

At this time, the torque transmission characteristic of the clutch disc is
It moves to the operation line shown by the broken line in the figure. In this operating line, the amount of torque that can be transmitted is increased compared to the operating line shown by the solid line. Therefore, the maximum torque amount that can be transmitted only by the coil spring 6 increases from the conventional maximum torque amount value Tq ₁ to the value Tq ₂ . Therefore, even if the drag resistance of the transmission assembled to the engine increases due to the difference in the model, the preload of the coil spring 6 can be adjusted to an optimum value according to the increase amount.

FIG. 3 shows a second embodiment of the present invention, in which each spring seat 18 (only one of which is shown) comprises a pedestal 19 and a locking piece 20 as seat height adjusting means. The locking piece 20 is a hat-shaped member fixed to the tip surface of the cylindrical portion 19a of the pedestal 19, and is configured to lock the end surface of the coil spring 6 to the flange-shaped portion 20a formed on the outer peripheral edge thereof.

The locking piece 20 is formed of a so-called shape memory alloy, for example, a titanium-nickel alloy, and at a temperature equal to or lower than a predetermined temperature Tc, the flange-shaped portion 20a is contracted by a distance l ₂ to increase the seat height. .

The operation will be described below.

The flange-shaped portion 20a of the locking piece 20 moves in the direction of arrow A in the figure and is located at the position indicated by the chain double-dashed line at a temperature equal to or lower than the predetermined temperature Tc, so that the preload of the coil spring 6 is increased. When the clutch temperature is Tc or lower, it is considered that the oil temperature of the transmission also has a value that makes the drag resistance of the transmission large, and at this time, by increasing the preload of the coil spring 6, the engine in the idling state is increased. The rotational torque is transmitted to the transmission only via the coil spring 6 of the first stage spring mechanism, and the clutch noise is reduced.

When the transmission temperature rises, the drag resistance decreases, and the clutch temperature rises above Tc, the flange-like portion 20a of the locking piece 20 moves in the direction of arrow B and is located at the position indicated by the solid line. Therefore, the preload of the coil spring 6 is reduced, and the pressing force corresponding to the drag resistance of the transmission is exerted.

FIG. 4 shows a third embodiment of the present invention. The seat height adjusting means in the present invention is composed of three spacers 14 to 16, and the spacers 14 to 16 are used for the plate units 2 and 3 and the hub plate 4. The spring seats 2 ', 3a, 4a are formed at the respective ends of the spring holes 2a, 3a, 4a, and the height of the spring seat 7'is increased by the thickness l ₁ of each spacer 14-16. In this case, by using spacers having different thicknesses l ₁ , the seat height of each spring seat 7 ′ is increased or decreased to adjust the preload of the coil spring 6.

The action of the spring seat 7'in this embodiment is as follows.
Since it can be easily inferred from the action of the spring seat 10 in FIG. 1, its explanation is omitted.

(Effect of the Invention) As described above, according to the present invention, the spring seat for locking the end surface of the coil spring arranged along the circumferential direction of the clutch disc is provided with the seat for adjusting the spring length of the coil spring. Since the height adjusting means is provided, the spring seat can adjust the preload of the coil spring. As a result, the noise of the clutch at the time of idling of the engine can be reduced, the compatibility between the clutch and the transmission can be improved, and the versatility of the spring seat can be improved to reduce the manufacturing cost. effective.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of a clutch spring seat to which the present invention is applied, FIG. 2 is a graph showing torque transmission characteristics of a clutch disc, and FIG. 3 is applying the present invention. A partially cutaway side view showing a second embodiment of a clutch spring seat, FIG. 4 is a partially cutaway side view showing a third embodiment of a clutch spring seat to which the present invention is applied, and FIG. 5 is a conventional view. FIG. 6 is a sectional view of the clutch disc to which the spring seat of FIG. 6 is applied, and FIG. 6 is a partially cutaway side view of the spring seat of FIG. 6 ... Coil spring, 7 ', 10, 18 ... Spring seat, 12 ... Locking piece, 14-16 ... Spacer (seat height adjusting means), 20 ... Locking piece (seat height adjusting means) ).

Claims (1)

[Scope of utility model registration request] 1. A spring seat for locking an end surface of a coil spring arranged along a circumferential direction of a clutch disc, comprising a seat height adjusting means for adjusting a spring length of the coil spring. Spring seat for clutch.