JPH0137224Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring release prevention structure suitable for damper assemblies with severe space constraints, such as lock-up clutches, among clutch disks and damper disks.

FIG. 1 is a partially cutaway front view of a conventional damper assembly, and FIGS. 2 and 3 are a sectional view and a sectional view, respectively, of FIG. First, in Figure 2,
The hub 1 is integrally provided with an annular flange 2 on its outer peripheral surface, and a pair of annular side plates 3 and 4 (a sub side plate and a main side plate) are arranged on both sides of the flange 2. The flange 2 and both plates 3, 4 are provided with four window holes 5, 6, 7 spaced apart in the circumferential direction of the clutch disk (Fig. 1). 7
are opposed in a direction parallel to the center line _R1 of the output shaft (horizontal direction in FIG. 2). 1 set of 3 window holes 5 each,
6 and 7 are compressed coil springs 8 in the circumferential direction.
(torsion spring) is fitted, and the
Each spring 8 except spring 8' at the bottom of the figure
is formed by fitting a weak spring 8a with a small radius into a strong spring 8b with a larger radius. Further, each spring 8 extends in the circumferential direction of the damper assembly, and the flange 2 and both plates 3 and 4 are elastically connected by the spring 8 in the direction of rotation. Furthermore, both plates 3,
4 are integrally connected to each other by a stop pin 9. The main side plate 4 integrally has a hub 11 having an internal spline 10 on its inner periphery, and is fitted to an output shaft (not shown) concentric with the input shaft so as to rotate together. A claw portion (not shown) connected to the input shaft engages with a recess 2a provided on the outer periphery of the flange 2, and a side plate 3
The inner peripheral portions of the flange 2 and the flange 2 are in pressure contact with each other via the friction member 12. Furthermore, as is clear from the left half of FIG. 1, the stop pin 9 passes through an elongated hole 2b provided in the flange 2 and elongated in the circumferential direction.

Here, when torque is input to the flange 2 via the input shaft and the claw portion, it is transmitted to the output shaft via the spring 8, side plates 3, 4, and hub 11. In this case, the spring 8 is compressed in response to the transmitted torque, and both side plates 3 and 4 are twisted with respect to the flange 2 until the stop pin 9 comes into contact with the circumferential end of the elongated hole 2b, and the friction member 12 is twisted. Slippage occurs. The slippage generates hysteresis torque, which absorbs torque vibrations and prevents abnormal vibrations and noises in the power transmission mechanism. Note that play is provided between both ends of the spring 8' at the lower end of FIG. 1 and both edges of the window hole 7, and in the free state shown in FIG. 2
Since the distances between the two end portions in the circumferential direction of b are not the same, the torsion angle-torsion torque characteristics shown in FIG. 4 are exhibited. H ₁ is the hysteresis torque.

However, the conventional configuration described above has the following problems. Figure 5 is an enlarged view of the window hole in Figure 1.
Figure 6 shows the case where the damper assembly is in a free state, and Figure 6 shows the case in Figure ₁ where torque in the direction of arrow This is an enlarged view of the case where it is twisted to the angle θ ₁ (FIG. 4). As is clear from FIG. 5, the window hole 7 (the same applies to the window hole 6) has an inner circumferential edge 7a that is straight in the tangential direction, an outer circumferential edge 7b that is substantially arc-shaped, and both left and right side edges 7c and 7d that are inner circumferential. The window hole 5 has a shape that opens slightly from the side toward the outer circumferential side, and the window hole 5 is longer in the radial direction than the window holes 7 and 6, and has both left and right side edges 5a,
5b are parallel. In the free state, the spring 8 is supported in the compression direction by the side edges 5a, 5b of the window hole 5 via the disc-shaped washer 12, and
It is supported by the side edges 7a, 7b so as not to protrude out of the window holes 5, 7, 6. Here, the width l ₁ at the center of the window hole 7 is the left and right side edges 7c and 7d.
The length l ₃ is wider than the width l ₂ of the damper assembly, but this configuration is necessary for smooth twisting of the damper assembly when the damper assembly is twisted as shown in FIG. For example, if the outer circumferential edge 7b is made straight like the inner circumferential edge 7a as shown by the imaginary line A in FIG. As a result, not only the vibration absorbing ability is reduced, but also the durability is reduced due to breakage of the spring 8 and the window holes 6 and 7. However, in the configurations shown in FIGS. 5 and 6, the width of the window hole 7 is increased by the length l ₃ , so that when the damper assembly is in a twisted state (FIG. 6), the spring 8 due to the window hole 7 is If the support is insufficient, a problem arises in that the spring 8 easily pops out from inside the window hole 5 due to a slight impact or the like.

Of course, conventional automobile clutch discs (for example, Utility Model Publication No. 55-48893) have sufficient space, so the idea was to support the spring by integrally forming a collar in the window hole. is already known.

The present invention is suitable for damper assemblies such as lock-up dampers incorporated in torque converters, which have a large maximum torsion angle and lack space to form a collar to prevent springs from coming off.
It is an object of the present invention to provide a spring removal prevention structure that can reliably prevent the spring from being pulled out without forming a flange on the window hole.The present invention will now be explained based on the drawings.

FIG. 7 is a partially cutaway front view of the damper assembly according to the present invention, and FIGS.
FIG. Here, parts corresponding to those in FIGS. 1 and 2 showing the conventional damper assembly described above are given the same reference numerals. As is clear from comparing FIG. 9 with FIG. 3 showing the above-mentioned conventional configuration, in FIG. It is biased in the direction of separation (to the right in the figure), and the inner circumferential edge 7a is shifted radially outward (arrow B
The spring 8 is supported by extending in the direction (direction). As a result, the width _l4 of the window hole 7 according to the present invention shown in FIG. 9 can be made narrower than the width _l1 of the window hole 7 of the conventional example shown in FIG. That is, as is clear from FIGS. 10 and 11, which correspond to FIGS. 5 and 6, the width _l4 of the window hole 7 according to the present invention can be made narrower than the conventional width _l1 .

Furthermore, the window hole 7 into which the springs 8 other than the lowest spring 8' in FIG.
As is clear from the figure, the 10th edge of the outer peripheral side edge 7b
The portion 7b' on the left side of the figure does not have an arc shape but smoothly protrudes inward (in this case, it is formed in a straight line), which also reduces the width l ₄ of the window hole 7. The spring 8 can be prevented from popping out. In other words, when torque is input to the input shaft in the direction _{of arrow} do. The damper assembly is moved from the position shown in Figure 10 to the position shown in Figure 11.
It changes to the posture shown in the figure and twists. At this time, as is clear from a comparison between FIG. 11 and FIG. 6 of the conventional example, in FIG.
Since b' extends toward the inner circumference, the outer circumferential end of the spring 8 is reliably held by the portion 7b'. This holding is made more reliable because the inner peripheral side edge 7a of the window hole 7 is extended toward the outer peripheral side. Therefore, even if the damper assembly is twisted to the maximum torsion angle θ ₁ (FIG. 4), the inner circumferential edge 7a and outer circumferential edge 7b of the window hole 7 will be twisted as shown in FIG.
As a result, the spring 8 is held and does not come out from the window hole 7.

As explained above, according to the present invention, with respect to one or more pairs of window holes 6, 7 on both side plates 3, 4, at least one window hole 7 of side plate 4 is provided.
An overhanging portion 7b' that smoothly overhangs inward in the radial direction is formed on the generally arcuate outer circumferential edge 7b on the radially outward side of the Since it is located near the circumferential edge 7c of the window hole 7 of the side plate 4, which the coil spring 8 comes into contact with when the torsion angle θ ₁ ) is twisted in the above-mentioned one direction, there is no problem with the degree of twisting. Moreover, the coil spring 8 can be held by the window hole 7, and there is an advantage that the spring 8 can be reliably prevented from coming off without forming a flange in the window hole 7. Therefore, the present invention has the advantage that it can be applied to damper assemblies such as rock-up dampers that do not have enough space to form a flange, and since no flange is formed, the structure can be simplified and costs can be reduced. There are some advantages to doing so.

In carrying out the present invention, the structure in which the inner circumferential edge 7a extends outward may be omitted by simply forming the portion 7b' on the outer circumferential edge 7b of the window hole 7.
Further, the shape of the portion 7b' is not limited to a linear shape, and for example, the central portion of the window hole 7 may be extended to the inner circumferential side. Further, in the above embodiment, the structure of the present invention was adopted only on the side plate 4 side, but it goes without saying that it can be adopted on the side plate 3 side as well, if necessary.

Although this is not an embodiment of the present invention, only a configuration in which the inner peripheral side edge 7a of the window hole 7 is extended to the outer peripheral side is adopted,
Even if the portion 7b' is not provided, it is effective to prevent the spring 8 from being pulled out.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a conventional damper assembly, Figs. 2 and 3 are - and - sectional views of Fig. 1, and Fig. 4 is a graph showing torsion angle-torsion torque characteristics. 5 is a partially enlarged view of FIG. 1, FIG. 6 is a partial front view showing the operating state, FIG. 7 is a partially cutaway front view showing the spring release prevention structure of the damper assembly according to the present invention, FIGS. Figure 9 is the seventh
10 is a partially enlarged view of FIG. 7, and FIG. 11 is a partial front view showing an operating state. 1...Hub, 2...Flange, 3, 4...Side plate, 5, 6, 7...Window hole, 7b...Outer peripheral edge, 7b'...Part, 7c...Edge, 8... Coil spring, θ ₁ ... Maximum torsion angle.

Claims (1)

[Scope of utility model registration request] A pair of integrally connected side plates are arranged on both sides of the annular flange of the hub, a plurality of sets of window holes are provided in both side plates and the flange, and a coil spring extending approximately in the circumferential direction is installed in the window hole. In a damper assembly in which the maximum torsional angle in one direction is set to be larger than the maximum torsional angle in the other direction, the radius of the window hole in at least one side plate is set for one or more pairs of window holes on both side plates. An overhanging portion that smoothly overhangs inward in the radial direction is formed on the generally arcuate outer circumferential edge on the outward side in the direction, and the overhanging portion is formed when the coil is twisted in the one direction mentioned above, which has a larger maximum twist angle. A structure for preventing a spring from coming off of a damper assembly, characterized in that the spring is located near the circumferential edge of a window hole in a side plate where the spring comes into pressure contact.