JPH05263893A - Drive plate - Google Patents

Abstract

PURPOSE:To reduce the fluctuation of torque transmitted from an engine to the hydraulic power transmission device of an automatic transmission. CONSTITUTION:A drive plate 10 which connects the output shaft 40 of an engine to a torque converter 12, comprises a hub plate 18 and side plates 20, 22. The projected part 18a of the hub plate 18 is snapped into a circular space 36 formed by the side plates 20, 22. The circular space 36 is filled with viscous liquid. As the capacity of two chambers in the circular space 36 divided by the projected part 18a is changed by the relative rotation between the hub plate 18 and the side plates 20, 22, the viscous liquid moves between both chambers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive plate having a damper function provided between an engine and a fluid transmission device of an automatic transmission.

[0002]

2. Description of the Related Art As conventional drive plates, Japanese Utility Model Publication No. 57-100563 and Japanese Utility Model Publication No. 58-144146 are available.
Japanese Unexamined Patent Publication No. Sho 60-28650 and Japanese Unexamined Patent Publication No. Sho 62
There is one disclosed in Japanese Patent Publication No. 204053. In all of these, a spring is provided between a member connected to rotate integrally with the output shaft of the engine and a member connected to rotate integrally with the fluid transmission device. Is configured to transmit the rotational force via the.

[0003]

However, although the conventional drive plate as described above is provided with the spring for absorbing the shock, it is not provided with the means for damping the vibration. There is a problem that the torque fluctuation causes a resonance phenomenon between the engine and the fluid transmission device, which deteriorates the durability of the drive plate. In particular, such a resonance phenomenon occurs when the engine rotation speed is low such as when the engine is started.

[0004]

The present invention solves the above problems by providing a damper using a viscous liquid between a hub plate and a side plate. That is, the drive plate according to the present invention includes a hub plate connected to the output shaft of the engine, two side plates arranged so as to sandwich the outer peripheral side portion of the hub plate from both sides, and integrally joined to each other. It has a ring gear integrally attached to the outer periphery of the side plate and a spring that transmits a force in the circumferential direction between the hub plate and the side plate, and the spring has an arc shape provided on the hub plate. It is located in the arc-shaped spring holding part provided on the window and both side plates,
A gap corresponding to the thickness of the hub plate is provided between both side plates at a portion radially outside of the outer diameter portion of the hub plate except for a portion provided with a mounting hole for the fluid transmission. The arc-shaped space portion configured is provided, and the protruding portion that fits in the arc-shaped space portion is provided on the outer diameter portion of the hub plate, and the arc-shaped space portion is divided into two chambers by this protrusion portion. The viscous liquid is sealed in these chambers. The chamber in which the viscous liquid is sealed is preferably filled with a small amount of air.

[0005]

The rotational force of the output shaft of the engine is transmitted from the hub plate through the spring to the side plate, and is further transmitted from this to the fluid transmission device. Although torque fluctuations of the engine are also input during this torque transmission, the hub plate and the side plates move relative to each other in the rotational direction, so that the protruding portion of the hub plate is inside the arc-shaped space between the side plates. To move relative to the circumference. The arcuate space is divided into two chambers by the protrusion, but the volume of one chamber decreases and the volume of the other chamber increases due to the movement of the protrusion in the circumferential direction. Therefore, the viscous liquid in one chamber moves to the other chamber. The viscous liquid moves through a small clearance between the hub plate protrusion and both side plates. This causes a damping action. By filling a small amount of air in filling the arc-shaped space with the viscous liquid, the damping action can be made extremely small until the hub plate and the side plate relatively move in the rotational direction by a predetermined amount or more. it can. By doing so, the damping action is reduced during normal operation with small torque fluctuations, and vibration is prevented from being transmitted to the vehicle body. On the other hand, it is possible to obtain a sufficient damping action at the time of starting with a large torque fluctuation.

[0006]

EXAMPLES Examples of drab plates are shown in FIGS. As shown in FIG. 1, the drive plate 10 and the torque converter 12 are connected by a bolt 14. The bolt 14 penetrates a hole provided in the drive plate 10 to form the nut 1 integrated with the torque converter 12.
It is screwed into 6. The bolt 14 and the nut 1
Four 6 are provided respectively. Drive plate 10
Has a hub plate 18, two side plates 20 and 22, a spring 24, and a ring gear 26. The hub plate 18 is connected to the output shaft 40 of the engine by bolts 42 so as to rotate integrally with the output shaft 40 (see FIG. 3). The side plates 20 and 22 are arranged so as to sandwich the outer peripheral portion of the hub plate 18 from both sides, and are integrally joined by welding over the entire outer peripheral portion. Further, the inner diameter side of the side plates 20 and 22 are held by the rivets 28 so as to sandwich the hub plate 18. Sealing members 30 and 32 are provided on the inner diameter side of the side plates 20 and 22 to seal between the side plates 20 and 22 and the hub plate 18. A ring gear 26 is integrally joined to the outer periphery of the side plate 20 by welding. The ring gear 26 can be engaged with a pinion of a starter motor (not shown). The side plate 20 is provided with a convex portion 20a having a semicircular cross section.
2 is also provided with a convex portion 22a having a semicircular cross section at the same position, and the spring 24 is formed by the convex portions 20a and 22a.
A spring holding portion for arrangement is formed. This spring holding portion is arranged in an arc shape as shown in FIG. The hub plate 18 is provided with a window portion 34 at a position corresponding to the spring holding portion of the side plates 20 and 22. At both ends of the window 34, the spring 2
It is arranged so that both ends of 4 contact each other. As shown in FIG. 3, the outer diameter side portions of the side plates 20 and 22 with respect to the spring holding portions are separated by the thickness of the hub plate 18, and an arcuate space portion 36 is formed between them. (See Figure 2). However, only the portion for connecting the drive plate 10 to the torque converter 12 with the bolts 14 has the side plates 20 and 22 in close contact with each other as shown in FIG. Except for this portion, the arcuate space portion 36 is formed as described above. Therefore, the arcuate space portion 36 is divided into four locations. Hub plate 1
8 is provided with an integral projecting portion 18a on the outer periphery thereof. Four protrusions 18a are provided corresponding to the four arc-shaped spaces 36, and the protrusions 18a are positioned at the center of the arc-shaped spaces 36 in the circumferential direction in a natural state where no force acts. It is located in. The protrusions 18a are in contact with the side plates 20 and 22 on both sides thereof, and a very small clearance is formed between them. Further, the outer diameter side portion of the protruding portion 18a also fits in the arcuate space portion 36 with a small clearance. The arcuate space portion 36 is filled with a viscous liquid. As will be described later, the viscous liquid is used in the arc-shaped space 3
6 is not completely filled with air in the rest.

Next, the operation of this embodiment will be described. The rotational force from the output shaft 40 of the engine is transmitted to the torque converter 12 via the drive plate 10. That is, the rotational force of the output shaft 40 of the engine is transmitted to the hub plate 18, and the hub plate 18 compresses the spring 24. The spring 24 is the side plate 20.
And 22 so that the spring 24
Force from the side plates 20 and 22 is transmitted to the side plates 20 and 22.
The rotational force is transmitted to 2. Since the rotational force is transmitted through the spring 24, a resonance phenomenon occurs due to the torque fluctuation of the engine. This resonance phenomenon is attenuated by the action of the protruding portion 18a and the arcuate space portion 36 as follows. When a rotational force acts on the hub plate 18, the spring 24 is compressed and the hub plate 18 rotates relative to the side plates 20 and 22. Therefore, the protrusion 1
8a moves in the circumferential direction within the arcuate space portion 36. The arcuate space 36 is divided into two chambers by the protrusion 18a, but the volume of one chamber decreases and the volume of the other chamber increases due to the movement of the protrusion 18a. Therefore, the viscous liquid in one chamber moves to the other chamber through the small gap between the protrusion 18a and the side plates 20 and 22. Vibration is damped by the resistance when the viscous liquid moves.

The reason why the arcuate space 36 is not completely filled with the viscous liquid is as follows. That is, for example, during normal operation when the engine rotation speed is 1000 rpm or more, the torque fluctuation of the engine is very small, and if the damping action is strong in such a state, the torque fluctuation of the engine is transmitted to the vehicle body and noise is reduced. It tends to occur. However, if air is mixed in the arc-shaped space portion 36, the side plates 20 and 2 of the protruding portion 18a will be removed.
When the relative displacement with respect to 2 is small, the arc-shaped space 3
The air in 6 first moves between both chambers, and the damping force is small during this period. Therefore, minute fluctuations in engine torque are not transmitted to the vehicle body. On the other hand, in a state where the rotation speed is low and resonance is likely to occur, such as when the engine is started, the relative displacement of the protrusion 18a becomes large, and the viscous liquid moves between the two chambers in addition to the air, and the damping force increases. This prevents the occurrence of a resonance phenomenon. When the engine is started, the relative displacement of the protruding portion 18a with respect to the side plates 20 and 22 needs to be 1/2 or less of the maximum relative displacement thereof due to the occurrence of abnormal noise and the durability. For that purpose, it is necessary to exert the damping action by the viscous fluid before the relative displacement reaches 1/2 of the maximum relative displacement,
It is necessary to set the upper limit of the amount of air filling the arcuate space portion 36 so that it is less than 1/2 of the total volume of the arcuate space portion 36. Also, the lower limit of this is
It may be appropriately set based on the magnitude of the torque fluctuation width during normal operation when the engine speed is 1000 rpm or more.

[0009]

As described above, according to the present invention, the torque fluctuation of the engine can be attenuated by the drive plate. The arc-shaped space portion and the projection portion for this purpose are provided in a space portion that has not been used conventionally, and by arranging them, an extra space is unnecessary. Moreover, since the protrusion is provided in a portion having a large radius, it is possible to generate a sufficient damping force. In addition, by not completely filling the arcuate space with viscous liquid, the damping effect can be reduced during normal operation, while a large damping force can be obtained when there is a large rotational displacement such as during start-up. Become.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. (1 in FIG. 2
It is sectional drawing which follows 1 line. )

FIG. 2 is a plan view of a drive plate.

3 is a sectional view taken along line 3-3 of FIG.

[Explanation of symbols]

 10 Drive Plate 12 Torque Converter (Fluid Transmission) 18 Hub Plate 18a Projection 20 Side Plate 22 Side Plate 24 Spring 26 Ring Gear 36 Arc Space 40 Engine Output Shaft

Claims (2)

[Claims] 1. A drive plate connecting an output shaft of an engine and a fluid transmission of a transmission, wherein a hub plate connected to the output shaft of the engine and an outer peripheral portion of the hub plate are sandwiched from both sides. Two side plates arranged and integrally connected to each other, a ring gear integrally attached to the outer periphery of the side plate, and a spring for transmitting a circumferential force between the hub plate and the side plate. Has
The spring is located in an arcuate window part provided on the hub plate and an arcuate spring holding part provided on both side plates, and is a portion radially outside the outer diameter part of the hub plate and is fluidly transmitted. An arcuate space formed by a clearance corresponding to the thickness of the hub plate is provided between both side plates excluding the part where the device mounting hole is provided. A protruding part that fits inside the part is provided on the outer diameter part of the hub plate, and the arc-shaped space part is divided into two chambers by this protruding part, and the viscous liquid is sealed in these chambers. A characteristic drive plate. 2. The drive plate according to claim 1, wherein the chamber in which the viscous liquid is sealed is filled with a small amount of air.