JP3402513B2 - Torsion damper - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional damper which is inserted into a power transmission system of a prime mover having a torque fluctuation such as an engine for the purpose of damping. 2. Description of the Related Art Conventional examples of a torsional damper for attenuating rotational vibration from a prime mover accompanied by a torque fluctuation include those shown in FIGS. 7, 8 (a) and 8 (b). The conventional torsion damper includes a first rotating body (crankshaft) rotated by a motor (not shown) and a first rotating body (crankshaft).
A drive connection between a second rotating body (torque converter) to which rotation is to be input from the rotating body is buffered, and
It has a vibration damping mechanism. The vibration damping device is coupled to the first rotating body at a predetermined distance from the drive plates 1 and 2 to form a space for a torsional damper, and is coupled to the second rotating body and inserted into the space. And the driven plate 3. As shown in FIGS. 8 (a) and 8 (b), which are views A in FIG.
(A) shows the state when the drive plate 2 is removed), and one end of the spring retainer 1 in the circumferential direction.
0 torsion spring 8 (outer side)
In addition, a window 14 for interposing the torsion spring 9 (inner side) is formed, and the back plate 7 composed of a pair of plates is fitted in the window 14 of the driven plate 3. The driven plate 3 has an elongated hole 3a in the circumferential direction for fitting a friction block (friction member) 12, and an inner peripheral end surface of the driven plate 3 is supported by the drive plates 1 and 2 by a thrust washer 11. ing. On the other hand, as shown in FIG. 7, the drive plate 2 has a window 6 for engaging the claw 4a of the retaining plate 4 for urging the friction block 12 in the axial direction.
Are formed, and a disc spring 5 is interposed between the retaining plate 4 and the drive plate 2. The friction block 12 forms left and right gaps (play) in the elongated hole 3a by engagement of the claw portions 4a with the drive plate 2 in the circumferential direction. 2 are frictionally engaged with the opposing inner peripheral surfaces (drive plate 2
On the side, frictional engagement is performed via the retaining plate 4 and the disc spring 5). At this time, the central axis of the long hole 3a coincides with the radius. In this conventional example, the relative rotation angle between one of the two rotating bodies and the friction block 12 is within a predetermined angle range by the vibration damping device including the friction block 12, the retaining plate 4, the disc spring 5, and the like. In this case, no hysteresis torque is generated between the two rotating bodies, and a predetermined hysteresis torque is generated after the relative rotation until one of the gaps becomes zero. Excessive relative rotation between the drive plates 1 and 2 and the driven plate 3 during resonance of the torsional damper is prevented. In the conventional torsion damper described above, relative rotation occurs continuously between the drive plates 1 and 2 and the driven plate 3 when the torsion damper resonates, Friction block 12
However, since the retaining plate 4 has a cross-sectional shape as shown in the drawing, it has a small heat capacity and poor heat dissipation, and has a structure in which it comes into contact with only the disc spring 5. Inevitably, the retaining plate 4 is inevitably heated, and the heat is conducted to the disc spring 5, so that the durability of the disc spring deteriorates. According to the present invention, the shape of the retaining plate is axially fitted to a drive plate or a driven plate that rotates in the same direction as the retaining plate to increase the contact area, thereby facilitating heat radiation of the retaining plate. Accordingly, it is an object to solve the above-described problem. [0008] To this end, an arrangement according to claim 1 of the present invention comprises a drive plate coupled to one of two rotating bodies to be drivingly coupled to each other, and a drive plate coupled to the drive plate. A driven plate arranged coaxially adjacent to and coupled to the other of the two rotating bodies; a torsion spring circumferentially arranged to transmit power between the drive plate and the driven plate; A friction block arranged to apply a hysteresis torque when one of the blocks is pressed into frictional contact and a relative rotation difference occurs to the other, a retaining plate and a disc spring for pressing the friction block in the axial direction; And a claw portion of the retaining plate. Is made to coincide with the sliding center position when the friction block slides at the time of torsional damper resonance. According to the first aspect of the present invention, when the torsional damper resonates, the drive plate coupled to one of the two rotators and the driven plate coupled to the other of the two rotators. When the relative rotation occurs continuously during the rotation and heat is generated due to the sliding of the friction block, the friction block slides at the center position of the claw portion of the retaining plate when the torsional damper resonates. The center of the retaining plate, which becomes the hottest, is cooled efficiently, and the heat conduction from the retaining plate to the disc spring is significantly reduced, The durability of the disc spring is greatly improved. Embodiments of the present invention will be described below in detail with reference to the drawings. First, a reference example of the present invention will be described. FIG. 1 is a cross-sectional view showing a configuration of a first reference example of a torsional damper of the present invention, and FIG. 2 is a B view of FIG. 1 when a drive plate 2 is removed. FIGS. 1 and 2 correspond to FIGS. 7 and 8 (a) of the conventional example, respectively, and the same portions are denoted by the same reference numerals and description thereof will be omitted. This reference example differs from the above-mentioned conventional example in that the shape of the retaining plate is changed. That is, as shown in FIG. 1, the retaining plate 15 of the present reference example has an inner peripheral end extending toward the inner peripheral side and an extended portion having a U-shaped cross-sectional shape. Axial fitting structure that makes contact with the inner peripheral surface in two directions, an axial direction and a direction perpendicular to the axis. The retaining plate 15 can be formed by pressing a flat plate. In this case, FIG.
A large contact area can be secured by making the contact surface with the drive plate 2 extend over the entire circumference in the circumferential direction as shown by hatching in FIG. The shape of the claw portion 15a is the same as that of the above-described conventional example. Next, the operation of this embodiment will be described with reference to FIGS.
This will be described below. At the time of resonance of the torsional damper, relative rotation occurs continuously between the drive plates 1 and 2 and the driven plate 3, and heat is generated as the friction block 12 slides. At this time, the surfaces facing the axial direction of the friction block 12 slide on the drive plate 1 and the retaining plate 15, respectively. However, the drive plate 1 has a relatively large heat capacity and can radiate heat to the atmosphere. Not so hot. On the other hand, the retaining plate 15 has a small heat capacity, but is in contact with the drive plate 2 by the above-mentioned axial fitting structure, so that heat is conducted to the drive plate 2 and radiated from the drive plate 2 to the atmosphere. This prevents the retaining plate 15 alone from becoming hot. Therefore, the heat conduction from the retaining plate 15 to the disc spring 5 can be greatly reduced, and the durability of the disc spring 5 can be greatly improved. In addition, the above-described axial fitting structure has an effect of facilitating positioning. FIG. 3 shows a first embodiment of the torsional damper of the present invention.
FIG. 4 is a cross-sectional view showing the configuration of the embodiment, and FIG. 4 is a view C in FIG. 3 when the drive plate 2 is removed. FIG.
4 and 4 correspond to FIGS. 7 and 8 (a) of the conventional example, respectively, and the same portions are denoted by the same reference numerals and description thereof will be omitted. The first embodiment is different from the conventional example in that the positional relationship between the claw portion 4a of the retaining plate 4 and the friction block 12 in the circumferential direction is changed. That is, the claw portion 4 of the retaining plate 4
In order to rotate the drive plate 2 and the retaining plate 4 in the same direction, a penetrates through the window 6 provided in the drive plate 2 and engages with the drive plate 2. Since the portion penetrating through the window portion 6 comes into direct contact with the atmosphere, the heat radiation of the portion in contact with the atmosphere is enhanced. In consideration of this, in the present embodiment, as shown in FIG. That is, the temperature of the friction block 12 is adjusted to the highest temperature. As a result, the hottest part of the retaining plate 4 is efficiently cooled, the heat conduction from the retaining plate 4 to the disc spring 5 is greatly reduced, and the durability of the disc spring 5 is reduced. Performance can be greatly improved. In the above, the shape of the retaining plate may be changed as in the first embodiment.
In that case, the heat dissipation is further improved. FIG. 5 shows a second embodiment of the torsion damper of the present invention.
FIG. 6 is a cross-sectional view showing a configuration of the reference example, and FIG. 6 is a view D in FIG. 3 and 4 correspond to FIGS. 7 and 8 (a) of the conventional example, respectively, and the same portions are denoted by the same reference numerals and description thereof will be omitted. This reference example differs from the above-described conventional example in that a change is made to add a heat insulating sheet 13 as a heat insulating member between the retaining plate 4 and the disc spring 5 as shown in FIGS. ing. In this embodiment, the heat conduction from the retaining plate 4 to the disc spring 5 is greatly reduced by adding the heat insulating sheet, and the durability of the disc spring 5 can be greatly improved. In the above, the shape of the retaining plate may be changed as in the first embodiment.
In that case, the heat dissipation is further improved. According to the first aspect of the present invention, at the time of resonance of the torsional damper, the drive plate coupled to one of the two rotating bodies and the driven plate coupled to the other of the two rotating bodies. When relative rotation occurs continuously with the plate and heat is generated due to sliding of the friction block,
Since the center position of the claw portion of the retaining plate coincides with the sliding center position when the friction block slides at the time of torsional damper resonance, the hottest portion of the retaining plate is efficiently cooled. As a result, heat conduction from the retaining plate to the disc spring is greatly reduced, and the durability of the disc spring is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a configuration of a first reference example of a torsional damper of the present invention. FIG. 2 when drive plate 2 is removed
FIG. FIG. 3 is a sectional view showing a configuration of a first embodiment of the torsion damper of the present invention. FIG. 4 when the drive plate 2 is removed.
FIG. FIG. 5 is a cross-sectional view illustrating a configuration of a second embodiment of the torsion damper of the present invention. FIG. 6 when the drive plate 2 is removed.
FIG. FIG. 7 is a cross-sectional view showing a configuration of a conventional torsional damper. 8 (a) and 8 (b) show drive plate 2 respectively.
A in FIG. 7 and FIG. 7 when arrow A is removed.
FIG. [Description of Signs] 1, 2 Drive plate 3 Driven plate 4 Retaining plate 4a Claw portion 5 Disc spring 6 Window portion 8, 9 Torsion spring 12 Friction block (friction member) 13 Heat insulation member (heat insulation sheet) 15 Retaining plate 15a Claws

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoichi Tsuchiya 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisia Jex Co., Ltd. (72) Inventor Mori Atsuhiro 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) reference Patent Sho 61-10120 (JP, a) JP flat 2-8532 (JP, a) JitsuHiraku Akira 62-32228 (JP, U) (58 ) investigated the field (Int.Cl. ⁷ , DB name) F16F 15/129 F16F 15/139

Claims (1)

(57) Claims: 1. A drive plate connected to one of two rotating bodies to be drive-coupled to each other, and a drive plate disposed coaxially adjacent to the drive plate and connected to the other of the two rotating bodies. A coupled driven plate, a torsion spring arranged in a circumferential direction so as to transmit power between the drive plate and the driven plate, and pressed against one of the drive plate and the driven plate so as to make frictional contact with the other; A torsion damper comprising: a friction block arranged to apply a hysteresis torque when a rotation difference occurs; a retaining plate for pressing the friction block in an axial direction; and a disc spring. The center position of the claw part is adjusted when the torsional damper resonates. A torsional damper characterized in that it is aligned with a sliding center position when the action block slides.