JP2518419Y2 - Drive plate - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention connects a crankshaft of an engine and a hydraulic torque converter mounted on an automatic transmission to generate torque of the engine. It relates to a drive plate transmitting to a converter.

(Prior Art) The hydraulic pressure in the torque converter has increased as engine performance has increased and engine output has increased in recent years. Thrust displacement caused by this high-pressure oil causes drive plate displacement. The internal stress that occurs is considerably high.

This internal stress is the maximum near the engine mounting part of the drive plate, and if this maximum internal stress exceeds the allowable stress, cracks will occur and eventually there will be a problem of breakage. It is proposed that a throttle part is provided near the engine mounting part.

(Problems to be solved by the invention) However, the space allowed for the torque converter and the like tends to be narrowed due to demands for securing a vehicle interior space and downsizing. Therefore, it is necessary to make the narrowed portion as shallow as possible, which causes a problem that the rigidity of the drive plate is lowered and the durability is lowered. Further, the durability of the drive plate can be improved by increasing the thickness thereof, but in this case, the drag force due to the thrust displacement generated during the operation of the torque converter is transmitted to the engine side through the drive plate, This will cause vibration on the engine side.

If axial displacement (thrust direction) occurs in at least one of the engine and torque converter mounting parts, a bending moment acts on the drive plate, and this bending moment increases as it approaches the engine mounting part and torque converter mounting part. Therefore, the internal stress becomes maximum at the engine mounting portion of the drive plate. That is, stress concentration occurs in the engine mounting portion and the torque converter mounting portion, so if damage such as cracks occurs,
It will occur at the engine mounting part or the torque converter mounting part.

By the way, the ideal design of the drive plate is the following four items.

When the internal stress generated in each part is below the allowable stress,
It should be almost constant.

Easy to make.

The drag force due to the thrust displacement that occurs when the torque converter operates must not be transmitted to the engine side.

Reliably transmit the torque of the engine to the torque converter.

However, none of the above-mentioned conventional techniques satisfies all of the above four items, and there is a strong demand for improvement thereof.

This invention eliminates the above-mentioned drawbacks of the prior art,
The purpose is to provide a drive plate that satisfies all the ideal design requirements of the drive plate.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above object, the present invention is a drive plate for connecting an output shaft of an engine and an input part of a torque converter, and an engine mounting part for mounting the output shaft of the engine. And a torque converter mounting portion for mounting the input portion of the torque converter are provided concentrically, and these engine mounting portion and torque converter mounting portion are provided in the radial direction via a low wall thickness portion, The low-thickness portion is formed to be relatively thin in the entire circumferential direction as compared with the engine mounting portion and the torque converter mounting portion, and in the axial direction between the output shaft of the engine and the input portion of the torque converter. For relative displacement,
It is characterized in that it is deformed to generate a drag force, and the internal stress generated by this deformation is formed to a thickness that is equal to or less than the allowable stress.

(Operation) According to the drive plate of the present invention, between the engine mounting portion and the torque converter mounting portion,
Since a low-thickness portion that is relatively thin over the entire circumferential direction is provided, when the axial displacement occurs, large deformation occurs in the low-thickness portion, and the engine mounting portion or torque converter mounting The deformation will not occur much in the part. Therefore, the stress of the engine mounting portion and the torque converter mounting portion can be easily reduced to the allowable stress or less.

In addition, the low-thickness portion is thinly formed over the entire circumferential direction, and is deformed to generate a reaction force with respect to the relative axial displacement between the output shaft of the engine and the input portion of the torque converter. Since the internal stress is smaller than the allowable stress and there are no holes in the low-thickness part, the output shaft of the engine and the input part of the torque converter must have sufficient rigidity in the rotating direction. Can be connected.

In addition, the low-thickness portion is thinly formed over the entire circumferential direction, and stress concentration does not occur unlike the engine mounting portion and torque converter mounting portion. While maintaining the above, it can be formed thinner than these engine mounting portions and torque converter mounting portions. Therefore, since the axial rigidity of the drive plate can be reduced, even if the drive plate is deformed due to the axial displacement as described above, the drag force generated on the drive plate can be suppressed to be small. it can. That is, the force acting from the torque converter side to the engine side or from the engine side to the torque converter side can be reduced.

Furthermore, even if the low-thickness portion becomes thin, the output shaft of the engine and the input portion of the torque converter are connected with a sufficiently large rigidity in the rotational direction, so the torsional rigidity around the shaft will decrease. There is no. That is, the torque of the engine can be reliably transmitted to the torque converter. As a result, the durability of the drive plate can be significantly improved.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment shown in the drawings.

1 to 3 show a first embodiment of the present invention.
The figure shows the front view of the drive plate, and Fig. 2 shows II-I of Fig. 1.
FIG. 3 is a vertical cross-sectional explanatory view showing a usage state of the drive plate.

In the figure, 10 is a drive plate, and this drive plate 10 includes a crankshaft (output shaft) 40 (see FIG. 3) of an engine (not shown) and a torque converter 20.
Is connected to the cover plate (input section) 21 of and the torque of the engine is transmitted to the torque converter 20.

This invention particularly provides the engine mounting portion 130 for mounting the crankshaft 40 of the engine and the torque converter mounting portion 140 for mounting the cover plate 21 of the torque converter 20 concentrically, and these engine mounting portion 130 and torque converter The mounting portion 140 and the mounting portion 140 are spaced apart from each other in the radial direction via the low-thickness portion 15, and the low-thickness portion 15 is relatively in the entire circumferential direction as compared with the engine mounting portion 130 and the torque converter mounting portion 140. It is formed in a thin plate shape over the entire length, and is deformed to generate a reaction force with respect to relative displacement in the thrust direction (axial direction) between the crankshaft 40 of the engine and the cover plate 21 of the torque converter 20. It is characterized in that the internal stress generated by the deformation is formed to have a thickness that is equal to or less than the allowable stress.

 Next, the structure of this invention will be described in more detail.

The drive plate 10 is formed, for example, by plastically working a metal disc, and is composed of a circular portion 11 and a flange portion 12 obtained by bending the outer peripheral edge of the circular portion 11 toward the engine. An engine mounting portion 130 is provided on the center side and a torque converter mounting portion 140 is provided on the outer peripheral side.
In the engine mounting portion 130, a plurality of engine mounting holes 13, for example, six engine mounting holes 13 are formed concentrically with the center of rotation of the drive plate 10 at the same intervals. Also, the torque converter mounting part
In 140, a plurality of, for example, six torque converter mounting holes 14 are formed at the same intervals concentrically with the center of rotation of the drive plate 10.

The low-thickness portion 15 has a wall thickness between the engine mounting portion 130 and the torque converter mounting portion 140 over the entire area in the circumferential direction,
It is formed to be narrowed by the forming roller, and its thickness is constant.

Then, a flange portion 40a formed at the end of the crankshaft 40 of the engine on both sides of the engine mounting hole 13
And the reinforcement plate 16 are opposed to each other, and the mounting bolt 17 is attached to the flange portion from the reinforcement plate 16 side.
The drive plate 10 is connected to the crankshaft 40 by being screwed onto the 40a.

The cover plate 21 that covers the engine side of the torque converter 20 is formed, for example, by subjecting a metal disk to plastic working, and the circular portion 21a and the outer peripheral edge of the circular portion 21a are stepwise along the axial direction. The step portion 21b is formed, and the flange portion 21c is formed by bending the step portion 21b toward the torque converter 20. A plurality of, for example, six bosses 22 each having a rectangular cross section are welded to the step portion 21b on the same circumference so as to face the torque converter mounting holes 14 of the drive plate 10.
22 is arranged with the longitudinal direction along the circumferential direction, and a screw hole 22a is formed in the axial center portion thereof. The drive plate 10 is connected to the cover plate 21, that is, the torque converter 20 by screwing the mounting bolt 18 inserted from the torque converter mounting hole 14 into the screw hole 22a of the boss 22.

A ring gear 19 for a starter is formed on the outer peripheral surface of the flange 12 of the drive plate 10. The ring gear 19 may be welded to the flange 12 as a separate component.

 Next, the operation of the first embodiment of the present invention will be described.

When the crankshaft 40 rotates due to engine operation, the torque converter 20 operates via the drive plate 10, whereby the torque of the engine can be transmitted to the torque converter 20. When the pump impeller (not shown) rotates due to the operation of the torque converter 20, the pressure of the oil increases due to the centrifugal force and the cover plate 21 expands, and a predetermined amount of thrust displacement (axial displacement) resulting from this expansion. Acts on the drive plate 10.

In this case, a bending moment acts on the drive plate 10, and this bending moment becomes maximum at the engine mounting portion 130. That is, without the low-thickness portion 15, the stress is maximized in the engine mounting portion 130. In addition, the engine mounting portion 130 and the torque converter mounting portion 140
Is fixed to the flange portion 40a of the crankshaft 40 and the cover plate 21 of the torque converter 20, respectively, so stress concentration occurs in the vicinity thereof. Therefore, if there is no low-thickness portion 15, the engine mounting portion 130 A large stress will be generated in.

However, since the low-thickness portion 15 is provided as described above, when the thrust displacement as described above occurs,
Due to the elastic action of the low-thickness portion 15, a large deformation occurs in the low-thickness portion 15, and the engine mounting portion 130 and the torque converter mounting portion 140 do not significantly deform.
Therefore, the stress of the engine mounting portion 130 can be surely reduced to the allowable stress or less.

Further, the low-thickness portion 15 is thinly formed over the entire circumferential direction, is deformed with respect to the thrust displacement to generate a reaction force, and is formed to a thickness such that the internal stress generated by this deformation is equal to or less than the allowable stress. Since there is no hole in the low-thickness portion 15, the crankshaft 40 of the engine and the cover plate 21 of the torque converter 20 are
And can be connected with sufficiently large rigidity.

Further, the low-thickness portion 15 is formed thin over the entire circumferential direction, and since stress concentration does not occur unlike the engine mounting portion 130 and the torque converter mounting portion 140, the allowable stress level similar to that of the engine mounting portion 130 is obtained. While maintaining
It can be formed thinner than these engine mounting portions 130. Therefore, since the axial rigidity of the drive plate 10 can be reduced, even if the drive plate 10 is deformed due to the thrust displacement as described above, the drag force generated in the drive plate 10 can be suppressed to a small value. You can That is, the force acting from the torque converter 20 side to the engine side can be reduced. Therefore, vibration on the engine side due to thrust displacement can be prevented.

Even if the low-thickness portion 15 becomes thin, the crankshaft 40 of the engine and the torque converter 20 are
Since it is connected to the cover plate 21 with a sufficiently large rigidity, the torsional rigidity around the axis does not decrease. That is, the torque of the torque converter 20
Can be reliably transmitted.

Furthermore, in the vicinity of the low-thickness portion 15, a, b,
The internal stress generated at the points c and d due to the thrust displacement is as shown by the polygonal line A in FIG. In the figure, the straight line B represents the case of the conventional product, and the straight line C represents the allowable stress value. As can be seen from the figure, the internal stress generated at each point of the drive plate 10 is at a level below the allowable stress, and the maximum value of the internal stress at point c can be approximated to the internal stress at other points. In this way, the internal stress generated in the vicinity of the engine mounting hole 13 can be suppressed to a low level, so that the occurrence of cracks in the vicinity of the engine mounting hole 13 can be prevented. Therefore, the durability of the drive plate 10 can be significantly improved.

Furthermore, since the wall thickness of the engine mounting portion 130 and the torque converter mounting portion 140 can be set to be thicker than that of the conventional product, the rigidity of that portion is high, and the rotational force of the engine can be reliably transmitted to the torque converter 20. it can.

Furthermore, since the low-thickness portion 15 can be easily formed by the forming roller, the production can be performed very easily.

FIG. 5 is a vertical cross-sectional explanatory view of the low-thickness portion of the drive plate showing the second embodiment of the present invention.

In the figure, the low-thickness portion 15A is formed so as to gradually become thinner from the engine mounting portion 130 side toward the torque converter mounting portion 140 side. In this case, the stress generated at the points a, b, c, d due to the thrust displacement is as shown by the polygonal line D in FIG. As can be seen from the figure, the internal stress at point c, which is the maximum value, is even lower than in the case of the first embodiment. That is, in the case of the second embodiment,
The internal stress can be reduced as compared with the first embodiment only in the hatched portion shown in FIG. As a result, the durability can be further improved as compared with the case of the first embodiment.

[Effect of device]

As described above, according to the present invention, between the engine mounting portion and the torque converter mounting portion,
Since a low-thickness portion that is relatively thin over the entire circumferential direction is provided, when the axial displacement occurs, large deformation occurs in the low-thickness portion, and the engine mounting portion or torque converter mounting The deformation will not occur much in the part. Therefore, the stress of the engine mounting portion and the torque converter mounting portion can be easily reduced to the allowable stress or less.

In addition, the low-thickness portion is thinly formed over the entire circumferential direction, and is deformed to generate a reaction force against relative axial displacement between the output shaft of the engine and the input portion of the torque converter, and is generated by this deformation. Since the internal stress is formed to a thickness below the allowable stress and there are no holes in the low-thickness part, the output shaft of the engine and the input part of the torque converter are connected with sufficient rigidity in the rotational direction. can do.

In addition, the low-thickness portion is thinly formed over the entire circumferential direction, and stress concentration does not occur unlike the engine mounting portion and torque converter mounting portion. While maintaining the above, it can be formed thinner than these engine mounting portions and torque converter mounting portions. Therefore, since the axial rigidity of the drive plate can be reduced, even if the drive plate is deformed due to the axial displacement as described above, the drag force generated on the drive plate can be suppressed to be small. it can. That is, the force acting from the torque converter side to the engine side or from the engine side to the torque converter side can be reduced. Therefore, vibration on the engine side due to thrust displacement can be prevented.

Furthermore, even if the low-thickness portion becomes thin, the output shaft of the engine and the input portion of the torque converter are connected with a sufficiently large rigidity in the rotational direction, so the torsional rigidity around the shaft will decrease. There is no. That is, the torque of the engine can be reliably transmitted to the torque converter. As a result, the durability of the drive plate can be significantly improved.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention.
The figure shows the front view of the drive plate, and Fig. 2 shows II-I of Fig. 1.
I sectional view, FIG. 3 is a longitudinal sectional explanatory view showing a usage state of the drive plate, FIG. 4 is a diagram showing internal stress generated in each part of the drive plate, and FIG. 5 is a second embodiment of the present invention. It is a longitudinal cross-sectional explanatory view of the low-thickness portion of the drive plate shown. 10 …… Drive plate 13 …… Engine mounting hole 14 …… Torque converter mounting hole 15, 15a …… Low thickness part 20 …… Torque converter 21 …… Cover plate (input part) 40 …… Crankshaft (output shaft) 130 …… Engine mounting part 140 …… Torque converter mounting part

Claims (1)

(57) [Scope of utility model registration request] 1. A drive plate for connecting an output shaft of an engine and an input portion of a torque converter, the drive plate including an engine mounting portion for mounting the output shaft of the engine and a torque converter mounting portion for mounting the input portion of the torque converter. The engine mounting portion and the torque converter mounting portion are concentrically provided, and are separated from each other in the radial direction via a low-thickness portion, and the low-thickness portion is the engine mounting portion and the torque converter mounting portion. It is formed relatively thin in the entire circumferential direction as compared with the portion, and is deformed with respect to the relative axial displacement of the output shaft of the engine and the input portion of the torque converter to generate a drag force. A drive plate characterized by being formed to a thickness such that the internal stress generated by deformation is less than or equal to the allowable stress.