JP2008089053A - Starting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a starting device capable of dispensing with arrangement of a set block for connecting a drive plate of an engine and a cover part. <P>SOLUTION: The drive plate 4 is fixed on an output shaft 3 of the engine. The starting device 1<SB>1</SB>is provided with a cover 2<SB>1</SB>storing a torque converter 10, a lock-up clutch 30 and a damper device 40, and maintaining them oil-tightly, and functioning as a rotation input member of the torque converter 10 and the lock-up clutch 30. The cover 2<SB>1</SB>is constituted of a front cover 11 and a rear cover 12, a cylindrical part 12d is provided on the rear cover 12 and is extended to the engine side so that the rear cover 12 is connected to the front cover 11, an extended part 12a is integrally extended to the outer peripheral side than a connection part 2A, and the extended part 12a is connected to the drive plate 4. Thus, arrangement of the set block can be dispensed with. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a starting device disposed between a drive source and an automatic transmission mechanism, for example, in a vehicle such as an automobile, and more specifically, includes a drive plate of an output shaft of the drive source and a differential rotation absorbing mechanism. The present invention relates to a starting device connected to a cover portion.

  In general, in a vehicle equipped with an automatic transmission and using an internal combustion engine or the like as a drive source, for example, when the vehicle starts moving, the rotation of the drive wheels is stopped and the engine is in a rotating state. However, a starting device that transmits the driving force is required. Conventionally, a fluid transmission device such as a torque converter has been used as such a starting device, and in recent years, the rotation of the output shaft of the engine and the input shaft of the automatic transmission mechanism is locked up in order to improve fuel efficiency. Many with a lock-up clutch are also used.

  The torque converter and lockup clutch as described above need to contain hydraulic oil for fluid transmission and lubricating oil for lubricating the friction plate, and a cover is provided to enclose the torque converter and lockup clutch. ing. This cover is generally configured as a bag by joining a front cover and a rear cover, and is also configured as a rotation input member of a torque converter or a lock-up clutch. For this reason, it is necessary to connect the cover and a drive plate fixed to the output shaft of the engine, and a plurality of (for example, six) set blocks are welded at equal positions in the circumferential direction to the axial engine side of the front cover. The set block and the drive plate are fastened with bolts or the like to connect them (for example, see Patent Document 1).

JP 2006-189057 A

  However, in order to connect the front cover of the starting device and the drive plate using the set block, it is necessary not only to prepare the set block as a part, but also to fix the set block to the front cover by welding. There are obstacles to the reduction of the number of parts and the simplification of the manufacturing process.

  In general, in a torque converter with a lock-up clutch mechanism, the stator shaft is arranged on the outer peripheral side of the input shaft of the automatic transmission mechanism, so that the pump impeller is axially opposite to the engine and the turbine runner is The lockup clutch is arranged on the engine side of the turbine runner and is configured to frictionally engage the inner surface of the front cover.

  However, when a plurality of set blocks are welded to the front cover as described above, the front cover may be distorted due to the thermal stress generated during the welding, resulting in unevenness in the axial direction. In particular, judder during slip control of the lockup clutch There has been a problem that vibration is likely to occur.

  Furthermore, when the cover of the starting device is rotated, so-called ballooning occurs, which swells due to centrifugal force or hydraulic pressure in the cover, and in the circumferential direction of the front cover, the set block and the set block are fixed. Since the rigidity of the block is different from that of the block, there is a risk that the front cover will swell (is deformed so as to undulate) when this ballooning occurs. There has been a problem that judder vibration is likely to occur during slip control of the up clutch.

  Also, in recent years, in order to cope with higher output due to an increase in engine capacity (large displacement), the drive plate is increased in diameter, and engine torque transmission is performed on the outer periphery as much as possible to reduce the load on the drive plate. While the reduction is made, the development of the starter device itself has been developed more compactly, that is, it is necessary to lengthen the set block and install it by overhanging the outer peripheral side of the cover of the starter device. However, increasing the length of the set block on the outer peripheral side has a problem that the moment generated at the welded portion between the set block and the front cover is increased, making it difficult to ensure durability.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a starting device that eliminates the need for disposing a set block with respect to a cover portion and thus solves the above problems.

The present invention according to claim 1 (see, for example, FIGS. 1 to 7) can absorb the differential rotation between the rotation of the drive source and the rotation of the input shaft (61, 161) of the automatic transmission mechanism connected to the drive wheel. And a rotation transmission part (for example, 10, 30, 40, 130, 140) capable of transmitting the rotation of the drive source to the input shafts (61, 161) of the automatic transmission mechanism, and the rotation transmission part (for example, 10, 30). , 40, 130, 140) and a cover portion (2 ₁ , 2 ₂ , 102) that constitutes a rotational input member of the rotational transmission portion (for example, 10, 30, 40, 130, 140), A starting device (1 ₁ , 1 ₂ ) that connects the cover (2 ₁ , 2 ₂ , 102) and the outer peripheral portion of a disk-shaped drive plate (4) fixed to the output shaft (3) of the drive source. , 100)
The cover part (2, 102) includes a first cover member (11, 111) that covers the drive source side of the rotation transmission part (for example, 10, 30, 40, 130, 140) and the rotation transmission part (for example, 10, 30, 40, 130, 140) and a second cover member (12, 112) that covers the outer peripheral side of the drive source and the axially opposite side of the drive source, and is joined to the first cover member (11, 111). Have
At least one of the first cover member (11, 111) and the second cover member (12, 112) is a joint between the first cover member (11, 111) and the second cover member (12, 112). An extended portion (12a, 11a, 112a) integrally extended from the portion (2A, 2B, 102A) so as to be opposed to the outer peripheral portion of the drive plate (4);
The extending portion (12a, 11a, 112a) is configured to be connectable to the drive plate (4).
It is in the starting device (1 ₁ , 1 ₂ , 100) characterized by this.

According to a second aspect of the present invention (see, for example, FIGS. 1 to 3 and FIG. 7), the extended portion (12a, 112a) is integrally directed from the second cover member (12, 112) toward the outer peripheral side. Extended,
A starting device (1 ₁ , 100) according to claim 1, characterized in that

According to the third aspect of the present invention (see, for example, FIGS. 1 to 3 and FIG. 7), the first cover member (11, 111) is bent at the outer periphery of the tip toward the axial drive source side. A drum portion (11f, 111f)
The second cover member (12, 112) has a fitting portion (12f, 112f) that covers the drum portion (11f, 111f) of the first cover member and is fitted to the drum portion (11f, 111f). And
The first cover member (11, 111) and the second cover member (12, 112) are joined by welding the drum portion (11f, 111f) and the fitting portion (12f, 112f). The
A starting device (1 ₁ , 100) according to claim 2, characterized in that

According to a fourth aspect of the present invention (see, for example, FIGS. 4 to 6), the extending portion (11a) is integrally extended from the first cover member (11) toward the outer peripheral side.
A starting device (1 ₂ ) according to claim 1, characterized in that:

According to a fifth aspect of the present invention (see, for example, FIGS. 4 to 6), the first cover member (11) includes a drum portion (11f) formed to bend toward the axial drive source side, and the drum. A flange portion (11g) that is bent from the end on the axial direction drive source side of the portion (11f) toward the outer peripheral side and forms a root portion of the extending portion (11a),
The second cover member (12) covers the drum portion (11f) of the first cover member (11) at the distal end portion on the drive source side and is fitted to the drum portion (11f) ( 12f)
The first cover member (11) and the second cover member (12) are joined by welding the outer peripheral side of the fitting portion (12f) and the flange portion (11g),
A starting device (1 ₂ ) according to claim 4, characterized in that:

The present invention according to claim 6 (see, for example, FIGS. 1 to 7), the drum portion (11f) of the first cover member (11, 111) and the fitting portion (12f) of the second cover member (12). In addition, when the drum portion (11f) and the fitting portion (12f) are fitted, step portions (11c, 12c) that contact each other in the axial direction are provided, respectively.
A starting device (1 ₁ , 1 ₂ , 100) according to any one of claims 2 to 5, characterized in that:

According to a seventh aspect of the present invention (see, for example, FIGS. 1 to 6), the rotation transmission portion includes a pump impeller (13) connected to the second cover member (12) and an input shaft of the automatic transmission mechanism ( 61) having a torque converter (10) with a turbine runner (15) connected to
A starting device (1 ₁ , 1 ₂ ) according to any one of claims 1 to 6, characterized in that:

According to an eighth aspect of the present invention (see, for example, FIGS. 1 to 6), the rotation transmission portion includes a friction plate (32) that is detachable from the first cover member (11), and the first cover. A lockup clutch (30) capable of locking up rotation transmission between the member (11) and the input shaft (61) of the automatic transmission mechanism;
A starting device (1 ₁ , 1 ₂ ) according to claim 7, characterized in that:

According to a ninth aspect of the present invention (see, for example, FIG. 7), the rotation transmission portion is a starting clutch (130) capable of controlling a rotational engagement state between the cover portion (102) and an input shaft of the automatic transmission mechanism. With
A starting device (100) according to any one of claims 1 to 6, characterized in that.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, at least one of the first cover member and the second cover member is disposed so as to face the outer peripheral portion of the drive plate from the joint portion between the first cover member and the second cover member. In this way, the extended portion is provided so that the extended portion can be connected to the drive plate, so that it is not necessary to use a set block, and the number of parts can be reduced and the manufacturing process can be performed. Can be simplified.

  In particular, in a starting device equipped with a lock-up clutch, welding of the set block is unnecessary, that is, distortion of thermal stress in the first cover member and undulation during ballooning do not occur. It is possible to reduce judder vibration generated in the middle.

  Furthermore, even when the drive plate has a large diameter with respect to the cover part of the starter device, since a large moment does not occur in the welded part as in the case of using a set block, durability as a starter device Can be improved.

  According to the second aspect of the present invention, the extending portion can be extended integrally from the second cover member toward the outer peripheral side.

  According to the third aspect of the present invention, since the drum portion of the first cover member is bent toward the axial direction drive source side, the portion where the drum portion and the fitting portion are fitted from the drive source side. Can be welded. In particular, when ballooning occurs, stress generated in the welded portion on the drive source side with the fitted portion serving as a fulcrum becomes compressive stress, so that the strength of the welded portion can be improved.

  According to the fourth aspect of the present invention, the extending portion can be extended integrally from the first cover member toward the outer peripheral side.

  According to the fifth aspect of the present invention, since the flange portion is bent toward the outer peripheral side from the end on the axial direction drive source side of the drum portion of the first cover member, the fitting portion of the second cover member The outer peripheral side of the second cover member and the flange portion of the second cover member can be welded from the side opposite to the drive source side in the axial direction. In particular, when ballooning occurs, the stress generated in the welded portion with the fitted portion (drum portion and fitted portion) as a fulcrum becomes a compressive stress, and the strength of the welded portion can be improved.

  According to the sixth aspect of the present invention, when the drum portion and the fitting portion are fitted to the drum portion of the first cover member and the fitting portion of the second cover member, they contact each other in the axial direction. Since the step portions that contact each other are provided, the axial alignment of the first cover member and the second cover member can be facilitated when the first cover member and the second cover member are assembled.

  According to the seventh aspect of the present invention, the rotational transmission portion has a torque converter including a pump impeller connected to the second cover member and a turbine runner connected to the input shaft of the automatic transmission mechanism. Can be used.

  According to the eighth aspect of the present invention, the rotation transmission portion includes a friction plate that is detachably engageable with the first cover member, and is capable of locking up rotation transmission between the first cover member and the input shaft of the automatic transmission mechanism. Because it has a lock-up clutch, judder vibration is likely to occur when, for example, the set block is welded to the first cover member, but it is possible to eliminate the need for using the set block. Reduction can be achieved.

  According to the ninth aspect of the present invention, it is possible to use a rotation transmission portion provided with a start clutch that can control the rotational engagement state between the cover portion and the input shaft of the automatic transmission mechanism.

<First Embodiment>
A first embodiment according to the present invention will be described below with reference to FIGS.

First, a description will be given starting device 1 ₁ according to the present invention with reference to FIG. Note that, in the starting device 1 ₁ shown in FIG. 1, for example, in FR (front-engine front-drive) type vehicle in which the axial direction is mounted in the lateral direction, for convenience of explanation, the driving force is input Based on the coming direction, the right side in the figure is referred to as “front side” and the left side is referred to as “rear side”. Of course, the present invention is not limited to this. For example, an FR (front engine / rear drive) type vehicle may be mounted in the front-rear direction, that is, the drive system of the mounted vehicle is limited. Not what you want.

As shown in FIG. 1, the starting device 1 ₁ is a torque converter with a lock-up clutch mechanism is, for example, form a part of an automatic transmission with an automatic not shown transmission mechanism and the hydraulic control device, an automatic It is housed in a housing case 5 of the transmission. Emitting proceeds device 1 _1, more specifically a cover which is connected to the front cover (first cover member) 11 and the rear cover (second cover member) 12 to be described later, the output shaft of the engine (crankshaft) (cover) 2 constitute a _1, the space 2a of the cover 2 in _1, a torque converter (rotation transmission portion) 10, lock-up clutch (rotation transmission portion) 30 and a damper device (rotation transmission portion) 40, etc. are provided .

  The output shaft 3 of the engine (drive source) is provided with a drive plate 4 fixed by bolts 52 via washers 53 and 54, and a rear cover 12, which will be described in detail later, is connected to the drive plate 4 via bolts 51. Connected. Further, a center piece 7 fitted to the inner peripheral surface of the end portion of the output shaft 3 of the engine is fixed to the front cover 11 at the center portion on the front side, and the shaft alignment between the output shaft 3 and the front cover 11 is performed. Has been made.

In the cover 2 a _1, the torque converter 10, roughly, a pump impeller 13, a turbine runner 15 arranged against the said pump impeller 13 is disposed therebetween, the stator connected to the one-way clutch 20 14 and is configured to be oil-tight by being filled with oil. The pump impeller 13 is integrally disposed in the pump cover 12, that is, is configured to rotate integrally with the cover 2 ₁ (the engine output shaft 3). Further, the pump cover 12 has a support portion 12j formed on the rear inner peripheral side, and the rear end side of the support portion 12j is connected to the drive shaft of the oil pump 70 of the automatic transmission mechanism, It is rotatably supported by the housing case 5 or a transmission case (not shown) via a pump body 71 of the oil pump 70.

  The turbine runner 15 is integrally disposed in the turbine cover 16, and an inner peripheral side thereof is connected to the flange member 17 together with a driven plate 45 of a damper device 40 described later. The inner peripheral side of the flange member 17 is spline-engaged with the input shaft 61 of the automatic transmission mechanism, that is, the turbine runner 15 is rotationally connected to the input shaft 61 of the automatic transmission mechanism.

  The one-way clutch 20 includes an outer race 23, an inner race 21, and a sprag mechanism 23 that restricts the rotation of the outer race 22 in only one direction with respect to the inner race 21. The outer race 23 is connected. One inner race 22 is spline-engaged with a stator shaft 62 fixed to the pump body 71 on the rear side (that is, fixed to the housing case 5), and fixed to the rotational direction. .

  The stator 14 is in a state where the speed difference between the pump impeller 13 and the turbine runner 15 is large, and the rotation is fixed by the one-way clutch 20, and the flow of the oil sent to the front side by the rotation of the pump impeller 13 is received. While changing the flow direction, the flow is sent to the turbine runner 15 and a large torque is transmitted to the turbine runner 15 (torque increasing effect). Further, when the speed difference between the pump impeller 13 and the turbine runner 15 is reduced, the rotation of the stator 14 is automatically released by the one-way clutch 20 so that the flow of oil sent from the pump impeller 13 is not obstructed. The pump impeller 13 and the turbine runner 15 are rotated together in this direction.

  On the other hand, a lock-up clutch 30 is disposed on the back side of the front cover 11. The lock-up clutch 30 has a clutch plate 31, and the clutch plate 31 is slidably fitted to the flange member 17 on the inner peripheral side, that is, configured to be movable in the axial direction. ing. Further, a friction material 32 facing the back surface of the front cover 11 is fixedly formed on the front side of the outer periphery of the clutch plate 31. The drive plate 41 of the damper device 40 is fixed to the rear surface side of the clutch plate 31 via the pin 43, that is, the damper device 40 is disposed on the rear surface side of the clutch plate 31. Yes.

  The damper device 40 includes the drive plate 41, two driven plates 42 and 45, and a damper spring (elastic member) 44. The drive plate 41 is fastened by the pin 43 as described above and holds the driven plate 42 between the clutch plate 31 and the inner peripheral portion of the driven plate 42 is formed in a spline shape in the circumferential direction. Thus, the pin 43 is slidably supported. The damper spring 44 is contracted so that one end is in contact with the drive plate 41 and the other end is in contact with the driven plate 42. That is, the rotational force transmitted from the engine output shaft 3 to the drive plate 41 is Then, it is transmitted to the driven plate 42 via the damper spring 44. The driven plate 42 is connected to the driven plate 45 at a position in the circumferential direction different from the cross section in the drawing, and is fastened to the flange member 17 via the driven plate 45. That is, the driven plates 42 and 45 and the input shaft 61 of the automatic transmission mechanism are rotationally connected.

  The input shaft 61 of the automatic transmission mechanism is rotatably supported by the stator shaft 62 and is spline-engaged with the flange member 17 at the spline portion on the outer peripheral side of the tip. Further, an outer peripheral surface 61a that is processed smoothly with high accuracy is formed on the rear side of the spline portion of the input shaft 61, and is also processed with high accuracy and smoothness on the inner peripheral rear side of the flange member 17. The inner peripheral surface 17a is formed, and the outer peripheral surface 61a and the inner peripheral surface 17a are fitted with high precision. An oil passage 61 b is formed at the center of the input shaft 61, and a front end portion of the oil passage 61 b is opened to communicate between the front cover 11 and the clutch plate 31 of the lockup clutch 30. Has been.

At the time of power transmission by the torque converter 10, that is, at the time of releasing control of the lock-up clutch 30, for example, the input from the hydraulic control device (not shown) electronically controlled based on the determination in a control unit (ECU) not shown. The lock-up off pressure Poff is supplied to the oil passage 61b of the shaft 61, and the lock-up off pressure Poff is supplied between the front cover 11 and the clutch plate 31 of the lockup clutch 30 so that the clutch plate 31 is moved to the rear side. The friction material 32 is separated from the front cover 11, that is, the lock-up clutch 30 is released. Further, the lock-up off pressure Poff is supplied to the space 2a of the cover 2 in _1, while maintaining the torque converter 10 to the oil honey-like, through between the supporting portion 12j and the stator shaft 62, It is discharged toward an oil pan of a hydraulic control device (not shown).

On the other hand, at the time of slip control or engagement control of the lock-up clutch 30, for example, from the hydraulic control device (not shown) electronically controlled based on the determination in a control unit (ECU) not shown, lockup oN pressure Pon between the stator shaft 62 is supplied, it is supplied to the space 2a of the cover 2 in ₁ via the torque converter 10. The lock-up on pressure Pon supplied into the space 2a is initially guided between the front cover 11 and the clutch plate 31 to the oil passage 61b of the input shaft 61, and is not shown as the lock-up discharge pressure Pex. The clutch plate 31 gradually moves forward due to the differential pressure before and after the clutch plate 31, and starts to abut and press the friction material 32 against the front cover 11. The slip state between the friction material 32 and the front cover 11, that is, the slip state of the lock-up clutch 30 is controlled in such a manner that the differential pressure is adjusted by adjusting the lock-up on pressure Pon by the device. When the lock-up on pressure Pon is increased, the differential pressure before and after the clutch plate 31 is increased and the pressure of the friction material 32 against the front cover 11 is increased, that is, the lock-up clutch 30 is controlled to be engaged. Is done.

Next, the cover 2 ₁ , that is, the front cover 11 and the rear cover 12 which are the main parts of the present invention will be described in detail. As shown in FIG. 1, the front cover 11 includes a flange portion 11e that covers the front side (drive source side) of the torque converter 10, the lock-up clutch 30, and the damper device 40, and a front side from the outer peripheral side of the flange portion 11e. And a drum portion 11f formed by bending at a bending portion 11d. The drum portion 11f includes an integral member, and an outer peripheral surface 11b and a step portion 11c are provided on the outer peripheral side of the drum portion 11f. Is formed.

  On the other hand, the rear cover 12 has a support portion 12j that is rotatably supported by the pump body 71 of the oil pump 70, a pump that extends from the support portion 12j to the outer peripheral side, and the pump impeller 13 is fixed to the inner peripheral side. A cover portion 12e; a cylindrical portion 12d that extends from the outer peripheral side of the pump cover portion 12e to the front side and covers the outer peripheral side of the turbine runner 15, the lock-up clutch 30, the damper device 40, and the front cover 11, and the cylindrical portion A flange portion 12g bent and extended from 12d to the outer peripheral side, and an extension portion 12a extended from the flange portion 12g to the outer peripheral side, for example, at six positions in the circumferential direction (see FIG. 2); It is comprised by the integral one member. A fitting portion 12f that fits into the drum portion 11f of the front cover 11 is formed on the front side of the cylindrical portion 12d, and an inner peripheral surface 12b is formed on the inner peripheral side of the fitting portion 12f. And a step portion 12c are formed.

That is, at the joining portion (joining portion) 2A that joins the front cover 11 and the rear cover 12, the front cover 11 is inserted from the front side to the rear side of the rear cover 12, and the step portions 11c, 12c is abutted and positioned in the axial direction, and the outer peripheral surface 11b of the drum portion 11f and the inner peripheral surface 12b of the fitting portion 12f are fitted. Since the drum portion 11f of the front cover 11 is bent toward the front side, as shown in FIGS. 1 and 2, the outer peripheral surface 11b of the drum portion 11f of the front cover 11 and the fitting portion 12f of the rear cover 12 are provided. Can be welded in the circumferential direction at the welded portion A from the front side, and the front cover 11 and the rear cover 12 are joined to each other by the welded portion A. 2 ₁ is configured.

A bolt hole 12h is formed in the extended portion 12a of the rear cover 12, and the bolt 51 penetrates together with the bolt hole 4a (see FIG. 1) drilled at the same position in the outer peripheral portion of the drive plate 4. As a result, the rear cover 12 is fastened to the drive plate 4. Thus, rotation of the output shaft 3 of the engine is transmitted to the rear cover 12 through a drive plate 4, i.e., the cover 2 _1. In addition, it is possible to respond immediately to the diameters of the different drive plates 4 only by adjusting the drilling position of the bolt hole 12h of the extending portion 12a. For example, an engine mounted in the same type of vehicle Even if there are multiple types of models, it can be easily handled.

Incidentally, in the starting device 1 _1, the cover 2 ₁ swells the centrifugal hydraulic pressure and the lockup hydraulic, etc. of the cover 2 in _1, the so-called ballooning is generated. When this ballooning occurs, as shown in FIG. 3, both the front cover 11 and the rear cover 12 swell, and in particular, the flange portion 11e of the front cover 11 has, for example, 1 to It is pressed about 2 mm in the direction in which the rear cover 12 is expanded. At this time, since a conventional set block is not welded to the front side of the front cover 11, the front cover 11 swells substantially evenly in the circumferential direction, that is, the rear surface side (friction plate) of the lockup clutch 30. Concavities and convexities do not occur in the portion where 32 contacts.

  During this ballooning, the outer peripheral surface 11b of the drum portion 11f of the front cover 11 and the inner peripheral surface 12b of the fitting portion 12f of the rear cover 12 serve as a fulcrum at the joint portion 2A. It becomes a shape to be bent to be pressed between the outer peripheral surface 11b and the inner peripheral surface 12b. Therefore, the stress generated in the bent portion 11d is a tensile stress as indicated by arrows b1 and b2 in the drawing, and the stress generated in the welded portion A is a compressive stress as indicated by arrows a1, a2 and a3 in the drawing. Thereby, unlike the conventional welding which connects the front cover and the rear cover, no tensile stress is generated in the welded portion A, and the strength of the welded portion A is improved.

According to the starting device 1 ₁ according to a first embodiment of the present invention as described above, the rear cover 12, extending integrally so as to be opposed along the joint portion 2A to the outer peripheral portion of the drive plate 4 Since the extended portion 12a is provided so that the extended portion 12a can be connected to the drive plate 4, the use of a set block can be eliminated, the number of parts can be reduced, and the manufacturing process can be simplified. Can be achieved.

  Further, since welding of the set block is not required, that is, distortion of thermal stress in the front cover 11 and undulation during ballooning do not occur, judder vibration generated during slip control of the lockup clutch 30 can be reduced.

Furthermore, even when the drive plate 4 is large relative to the cover 2 ₁ of the starting device 1 _1, since does not occur large moment welds as in the case of using the set block, cover 2 ₁ of durability, i.e., it is possible to improve the durability of the starting device 1 _1.

  Further, since the drum portion 11f of the front cover 11 is bent toward the axial engine side (front side), the portion where the drum portion 11f and the fitting portion 12f are fitted can be welded from the engine side. it can. Further, when ballooning occurs, the stress generated in the welded portion A on the engine side becomes a compressive stress with the fitted portion, that is, the fitted portion between the outer peripheral surface 11b and the inner peripheral surface 12b serving as a fulcrum. Strength can be improved.

  Further, when the drum portion 11f and the fitting portion 12f are fitted to the drum portion 11f of the front cover 11 and the fitting portion 12f of the rear cover 12, step portions 11c and 12c that abut against each other in the axial direction are provided. Since each is provided, when the front cover 11 and the rear cover 12 are assembled, their axial alignment can be easily performed.

<Second Embodiment>
Next, a second embodiment obtained by partially changing the first embodiment will be described with reference to FIGS. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 4, the starting device 12 according to the _second embodiment is integrally extended from the front cover 11 instead of the extending portion 12a of the rear cover 12 in the first embodiment. The extending portion 11a is provided.

  Specifically, the fitting portion 12f of the rear cover 12 is formed to a length that covers the drum portion 11f of the front cover 11, and one front cover 11 has the front side of the drum portion 11f on the outer peripheral side by the bent portion 11i. In other words, the flange portion 11g is integrally formed from the drum portion 11f. Further, as shown in FIG. 5, the extending portion 11a extends to, for example, six locations in the circumferential direction on the outer peripheral side of the flange portion 11g. Is integrally extended.

That is, in the joint portion (joint portion) 2B that joins the front cover 11 and the rear cover 12, the drum portion 11f of the front cover 11 is inserted into the end portion opened to the front side of the rear cover 12, so that the drum The outer peripheral surface 11b of the part 11f and the inner peripheral surface 12b of the fitting part 12f are fitted. Further, since the flange portion 11g is bent from the drum portion 11f of the front cover 11 to the outer peripheral side, that is, the flange portion 11g covers the front side of the fitting portion 11f of the rear cover 12, as shown in FIG. Further, it is possible to weld the outer peripheral side of the fitting portion 12f of the rear cover 12 and the rear surface side of the flange portion 11g of the front cover 11 in the circumferential direction at the welded portion B from the rear side. the part B, these and the front cover 11 and rear cover 12 are joined cover (cover section) 2 ₂ is constructed.

As in the first embodiment described above, the extending portion 11a of the front cover 11 is provided with a bolt hole 11h as shown in FIGS. The rear cover 12 is fastened to the drive plate 4 by passing the bolt 51 together with the bolt hole 4a (see FIG. 4) drilled at the same position in the portion. Thus, rotation of the output shaft 3 of the engine is transmitted to the front cover 12 via the drive plate 4, i.e., the cover 2 _2. Similarly, it is possible to immediately cope with different diameters of the drive plate 4 only by adjusting the drilling position of the bolt hole 11h of the extending portion 11a. For example, it is mounted on the same type of vehicle. Even if there are multiple types of engines that have multiple engines, it can be easily handled.

  Similarly, during ballooning, as shown in FIG. 6, the flange portion 11 e of the front cover 11 is expanded with respect to the rear cover 12 by about 1 to 2 mm, for example, like a flange portion 11 e ′ indicated by a broken line in the drawing. It is pressed in the direction to be pressed. Similarly in this case, since the conventional set block is not welded to the front side of the front cover 11, the front cover 11 swells substantially evenly in the circumferential direction, that is, the rear surface side of the lockup clutch 30 (friction Concavities and convexities do not occur in the portion where the plate 32 contacts.

  And the part of the outer peripheral surface 11b of the drum portion 11f of the front cover 11 and the inner peripheral surface 12b of the fitting portion 12f of the rear cover 12 in the joint portion 2B serves as a fulcrum, and the bent portion 11d is bent forward. While being pressed between the outer peripheral surface 11b and the inner peripheral surface 12b, the flange portion 11g is bent backward. Therefore, the stress generated in the bent portion 11d is a tensile stress as indicated by arrows e1 and e2 in the drawing, and the stress generated in the bent portion 11i is a compressive stress indicated by arrows d1 and d2 in the drawing, and The stress generated in the weld B is a compressive stress as indicated by arrows c1, c2, and c3 in the figure. Thereby, unlike the conventional welding which connects the front cover and the rear cover, no tensile stress is generated in the welded portion B, and the strength of the welded portion B is improved.

According to the starting device 1 ₂ according to a second embodiment of the present invention described above, the front cover 11, extending integrally so as to be opposed along the outer periphery of the drive plate 4 from the joint 2B Since the extended portion 11a is provided so that the extended portion 11a can be connected to the drive plate 4, the use of a set block can be eliminated, the number of parts can be reduced, and the manufacturing process can be simplified. Can be achieved.

  Further, since welding of the set block is not required, that is, distortion of thermal stress in the front cover 11 and undulation during ballooning do not occur, judder vibration generated during slip control of the lockup clutch 30 can be reduced.

Furthermore, even when the drive plate 4 is large relative to the cover 2 ₂ of the starting device 1 _2, since does not occur large moment welds as in the case of using the set block, cover 2 ₂ durable, i.e. it is possible to improve the durability of the starting device 1 _2.

  Further, since the flange portion 11g is bent toward the outer peripheral side from the axial engine side (front side) end portion of the drum portion 11f of the front cover 11, the outer peripheral side and the front side of the fitting portion 11f of the rear cover 11 are bent. The flange 11g of the cover 11 can be welded from the side opposite to the engine side in the axial direction (that is, the rear side). In particular, when ballooning occurs, the stress generated in the welded portion B with the fitted portions (the drum portion 11f and the fitted portion 11f) as a fulcrum becomes a compressive stress, thereby improving the strength of the welded portion B. it can.

  Further, when the drum portion 11f and the fitting portion 12f are fitted to the drum portion 11f of the front cover 11 and the fitting portion 12f of the rear cover 12, step portions 11c and 12c that abut against each other in the axial direction are provided. Since each is provided, when the front cover 11 and the rear cover 12 are assembled, their axial alignment can be easily performed.

<Third Embodiment>
Next, a third embodiment according to the present invention will be described with reference to FIG. The present invention has also been focused on reducing judder vibration during slip control of the lock-up clutch, which tends to occur due to non-uniform swelling due to the presence or absence of the set block of the front cover 11 during ballooning. The present invention can also be applied to a starting device that does not include a torque converter and that starts the vehicle by hydraulically controlling the engagement state of the starting clutch as developed. Hereinafter, as a third embodiment, a starting device 100 including a starting clutch will be described in detail.

  As shown in FIG. 7, the starting device 100 including the starting clutch 130 is configured to be housed in a housing case 105 of an automatic transmission. As in the first and second embodiments, a drive plate 4 is fixed to the engine output shaft 3 by bolts 52, and a cover (cover) 102 of the starting device 100 is connected to the drive plate 4. Has been.

  The cover 102 includes a front cover (first cover member) 111 covering the front side of a starting clutch (rotation transmission portion) 130 and a damper device (rotation transmission portion) 140, which will be described in detail later, and the starting clutch 130 and the damper device 140. The rear cover (second cover member) 112 covers the outer peripheral side from the rear side of the front cover 111. The front cover 111 includes a center member 111B having a center piece portion 111i fitted to the output shaft 3 of the engine, and the flange member 111B. The front cover portion 111 </ b> A fixed to the outer peripheral side is welded by the welded portion D to be configured. A support cover 163 supported by a pump cover (not shown) and connected to the drive shaft of the oil pump is welded by a welded portion E to form a rear cover in a broad sense on the rear inner peripheral side of the rear cover 112. is doing. The center member 111B is rotatably fitted to the input shaft 161 of the automatic transmission mechanism at the rear inner periphery, that is, the front cover 111 and the rear cover 112 that form the cover 102 are connected to the automatic transmission mechanism. While being rotatably supported by the input shaft 161, it is rotationally connected to the output shaft 3 of the engine and rotates at the same rotation as the engine.

  A starting clutch 130 is disposed on the back side of the center member 111B and the front cover portion 111A. The starting clutch 130 roughly includes a friction plate 131 composed of an outer friction plate 131a and an inner friction plate 131b, a cylinder portion 134, a piston member 135 for pressing the friction plate 131, the cylinder portion 134 and the piston. An oil chamber 136 formed between the member 135, a return plate 138, and a return spring 137 that biases the piston member 135 toward the oil chamber 136 with respect to the return plate 138. Yes. Further, the outer friction plate 131a of the friction plate 131 is spline-engaged with a spline member 133 fixed to the back side of the front cover portion 111A, so that the rotation of the engine is transmitted.

  The cylinder part 134 is formed on the back side of the center member 111B, and the piston member 135 is disposed so as to be slidable in the axial direction facing the cylinder part 134. The piston member 135 has a front end portion 135a disposed opposite to the friction plate 131, and an oil chamber 136 is formed by sealing the space between the piston portion 135 and the cylinder portion 134 in the inner peripheral portion. A return plate 138 is provided on the outer peripheral surface of the rear end portion of the center member 111B on the rear side of the piston member 135. The return plate 138 is restricted from moving rearward by a snap ring 139. The return spring 137 is contracted between the plate 138 and the piston member 135. The inner friction plate 131b of the friction plate 131 is spline-engaged with the hub member 132. The piston member resists the bias of the return spring 137 based on the engagement pressure supplied to the oil chamber 136. When the starting clutch 130 is engaged by pressing the friction plate 131 with the 135, the rotation of the engine is transmitted to the hub member 132, that is, the rotation of the engine is transmitted to drive plates 141 and 142 of the damper device 140 described later. The

  The damper device 140 is disposed on the rear side of the starting clutch 130 and includes the two drive plates 141 and 142, a driven plate 145, a large-diameter damper spring 144A, and a small-diameter damper spring 144B. Has been. The drive plates 141 and 142 are fastened by pins 143 together with the hub member 132 described above, and are slidably supported by the driven plate 145 so as to sandwich the driven plate 145. In addition, a slot corresponding to the pin 143 of the driven plate 145 is formed with a long hole so that the movement of the pin 143 in the rotational direction is not hindered.

  The drive plates 141 and 142 have a slot-shaped storage space 146 formed between them. The large-diameter damper spring 144A and the small-diameter damper spring 144B are stored in the storage space 146. The large-diameter damper spring 144A and the small-diameter damper spring 144B are connected in the expansion / contraction direction and constitute a so-called two-stage spring. The large-diameter damper spring 144A and the small-diameter damper spring 144B that are connected to each other are configured such that one end thereof is in contact with the drive plates 141 and 142 and the other end is in contact with the driven plate 145, that is, via the start clutch 130. The engine rotational force transmitted to the drive plates 141 and 142 is transmitted to the driven plate 145 via the large-diameter damper spring 144A and the small-diameter damper spring 144B. The spline 145s formed on the inner periphery of the driven plate 145 is spline-engaged with the input shaft 161 of the automatic transmission mechanism, that is, the driven plate 145 and the input shaft 161 of the automatic transmission mechanism are rotationally connected. ing.

  The oil chamber 136 of the start clutch 130 is connected to a hydraulic control device via an oil passage formed in the central portion of the input shaft 161 of the automatic transmission mechanism, and the engagement pressure supplied to the oil chamber 136 is increased. By adjusting the pressure by the hydraulic control device, the starting clutch 130 is slip-controlled or engaged. In addition, the input shaft 161 of the automatic transmission mechanism is formed with another oil passage outside the oil passage in the center portion, and is connected to the cover 102 through the spline 145s. The lubricating oil and the centrifugal canceling hydraulic pressure of the starting clutch 130 are configured to be supplied from a hydraulic control device (not shown).

  In the above starting device 100, when the rotation of the engine is transmitted to the cover 102, the outer friction plate 131a of the starting clutch 130 rotates integrally with the output shaft of the engine 2 via the front cover portion 111A and the spline member 133. . Here, when the engagement pressure is supplied to the oil chamber 136, the piston member 135 gradually presses the friction plate 131, the friction plate 131 is brought into a slip state, and the automatic transmission is gradually performed via the damper device 140. The rotation is transmitted to the input shaft 161 of the mechanism.

  When the engagement pressure supplied to the oil chamber 136 is further increased, the starting clutch 130 is engaged, and the drive plates 141 and 142 connected to the hub member 132 are rotationally connected to the engine output shaft 3. Is done. The damper springs 144A and 144B between the drive plates 141 and 142 and the driven plate 145 absorb torque fluctuations, transmit driving rotation to the driven plate 145, and transmit rotation to the input shaft 161 of the automatic transmission mechanism. .

  Next, the cover 102, that is, the front cover 111 and the rear cover 112, which are essential parts of the present invention, will be described in detail. As shown in FIG. 7, the front cover 111 covers the front side (drive source side) of the starting clutch 130 and the damper device 140 by the center member 111B and the front cover part 111A. A flange portion 111e, and a drum portion 111f bent at a bent portion 111d from the outer peripheral side to the front side of the flange portion 111e, and the inner peripheral side of the flange portion 111e is a center member by the welded portion D. It is welded to the outer peripheral side of 111B. Further, an outer peripheral surface 111b and a stepped portion 111c are formed on the outer peripheral side of the drum portion 111f.

  On the other hand, the rear cover 112 is fixed to the outer peripheral side of the support cover 163 by a welded portion E, and a rear cover portion 112e that covers the start clutch 130 and the rear side of the damper device 140 (the side opposite to the driving source side in the axial direction). A cylindrical portion 112d that extends from the outer peripheral side of the rear cover portion 112e to the front side, covers the outer peripheral side of the starting clutch 130 and the damper device 140, and is bent and extended from the cylindrical portion 112d to the outer peripheral side. The flange portion 112g and the extending portion 112a extended from the flange portion 112g to the outer peripheral side, for example, at six equal positions in the circumferential direction, are configured as one integral member. A fitting portion 112f that fits into the drum portion 111f of the front cover 111 is formed on the front side of the cylindrical portion 112d, and an inner peripheral surface 112b is formed on the inner peripheral side of the fitting portion 112f. And a stepped portion 112c are formed.

  As described above, the front cover 111 and the rear cover 112 according to the third embodiment have the same configuration as that of the first embodiment, and a joint (joint portion) 102A that joins the front cover 111 and the rear cover 112 is used. Similarly, the stepped portions 111c and 112c abut against each other to be positioned in the axial direction, and the outer peripheral surface 111b of the drum portion 111f and the inner peripheral surface 112b of the fitting portion 112f are fitted to each other. The welded portion C is welded in the circumferential direction to form the cover 102 in which the front cover 111 and the rear cover 112 are joined. Similarly, a bolt hole 112 h is formed in the extending portion 112 a of the rear cover 112, and the bolt 51 is penetrated together with the bolt hole 4 a of the drive plate 4, so that the rear cover 112 is inserted into the drive plate 4. Is concluded.

  Similarly, at the time of ballooning, the flange portion 111e of the front cover 111 is pressed in a direction to be expanded with respect to the rear cover 112, for example, about 1 to 2 mm, but the drum portion 111f of the front cover 111 at the joint portion 102A. The outer peripheral surface 111b and the inner peripheral surface 112b of the fitting portion 112f of the rear cover 112 serve as a fulcrum, and the bent portion 111d is bent forward, and between the outer peripheral surface 111b and the inner peripheral surface 112b. It becomes a shape to be pressed. Therefore, the stress generated in the bent portion 111d becomes tensile stress, and the stress generated in the welded portion C becomes compressive stress (see FIG. 3). Thus, unlike the conventional welding that connects the front cover and the rear cover, no tensile stress is generated in the welded portion C, and the strength of the welded portion C is improved.

  As described above, according to the starting device 100 according to the third embodiment of the present invention, the rear cover 112 is integrally extended so as to face the rear cover 112 along the outer peripheral portion of the drive plate 4. Since the extended portion 112a is configured to be connectable to the drive plate 4, it is not necessary to use a set block, and the number of parts can be reduced and the manufacturing process can be simplified. Can be planned.

  Further, even when the drive plate 4 has a large diameter with respect to the cover 102 of the starting device 100, a large moment does not occur in the welded portion as in the case of using a set block. In other words, the durability of the starting device 100 can be improved.

  Further, since the drum portion 111f of the front cover 111 is bent toward the engine side (front side) in the axial direction, the portion where the drum portion 111f and the fitting portion 112f are fitted can be welded from the engine side. it can. Further, when ballooning occurs, the stress generated in the welded portion C on the engine side becomes a compressive stress with the fitted portion, that is, the fitted portion between the outer peripheral surface 111b and the inner peripheral surface 112b serving as a fulcrum. Strength can be improved.

  Further, when the drum portion 111f and the fitting portion 112f are fitted to the drum portion 111f of the front cover 111 and the fitting portion 112f of the rear cover 112, step portions 111c and 112c that are in contact with each other in the axial direction are provided. Since each is provided, when the front cover 111 and the rear cover 112 are assembled, their axial alignment can be easily performed.

  In the first to third embodiments described above, the automatic transmission mechanism has not been described in detail. However, a known transmission mechanism is sufficient, and a stepped type, a stepless type (belt type, Any transmission mechanism such as a toroidal type) may be used.

  In the first to third embodiments described above, the extension portion 12a is extended from the rear cover 12, or the extension portion 11a is extended from the front cover 11, respectively. The extending portions may be extended from both covers. For example, the extending portions 11a of the front cover 11 and the extending portions 12a of the rear cover 12 are alternately arranged in the circumferential direction, that is, The extending portions may be provided alternately on the cover.

The side sectional view showing the starting device concerning a 1st embodiment. The front sectional view showing the starting device concerning a 1st embodiment. Explanatory drawing which shows the stress at the time of ballooning in the junction part of the starting apparatus which concerns on 1st Embodiment. Side surface sectional drawing which shows the starting apparatus which concerns on 2nd Embodiment. The front sectional view showing the starting device concerning a 2nd embodiment. Explanatory drawing which shows the stress at the time of ballooning in the junction part of the starting apparatus which concerns on 2nd Embodiment. Side surface sectional drawing which shows the starting apparatus which concerns on 3rd Embodiment.

Explanation of symbols

1 ₁ , 1 ₂ start device 2 ₁ , 2 ₂ cover (cover)
2A Joint part (joint part)
2B Joining part (joining part)
3 Drive shaft output shaft (engine output shaft)
4 drive plate 10 rotation transmission part, torque converter 11 first cover member (front cover)
11a Extension part 11c Step part 11f Drum part 11g ridge part 12 2nd cover member (rear cover)
12a Extension part 12c Step part 12f Fitting part 13 Pump impeller 15 Turbine runner 30 Rotation transmission part, Lock-up clutch 32 Friction plate 40 Rotation transmission part (damper device)
61 Input shaft 100 of automatic transmission mechanism Start device 102 Cover part (cover)
102A Joining part (joining part)
111 First cover member (front cover)
111f Drum portion 112 Second cover member (rear cover)
112a Extension part 112f Fitting part 130 Rotation transmission part, start clutch 140 Rotation transmission part (damper device)
161 Input shaft of automatic transmission mechanism

Claims (9)

A rotation transmission unit capable of absorbing a differential rotation between the rotation of the drive source and the rotation of the input shaft of the automatic transmission mechanism connected to the drive wheel, and capable of transmitting the rotation of the drive source to the input shaft of the automatic transmission mechanism; An outer peripheral portion of a disc-shaped drive plate that is fixed to the output shaft of the drive source and the cover portion that includes the rotation transmission portion and constitutes a rotation input member of the rotation transmission portion In the starting device that connects
The cover portion covers a first cover member that covers the drive source side of the rotation transmission portion, an outer peripheral side of the rotation transmission portion, and an axially opposite side with respect to the drive source, and is joined to the first cover member. A second cover member
At least one of the first cover member and the second cover member extends integrally so as to be opposed to the outer peripheral portion of the drive plate from a joint portion between the first cover member and the second cover member. Provided with an extended portion,
The extending portion is configured to be connectable to the drive plate.
A starting device characterized by that. The extending portion is integrally extended from the second cover member toward the outer peripheral side,
The starting device according to claim 1. The first cover member has a drum portion that is bent toward the axial drive source side at the outer peripheral portion of the tip,
The second cover member has a fitting portion that covers the drum portion of the first cover member and fits to the drum portion,
The first cover member and the second cover member are joined by welding the drum portion and the fitting portion,
The starting device according to claim 2. The extending portion is integrally extended from the first cover member toward the outer peripheral side,
The starting device according to claim 1. The first cover member is bent toward the axial drive source side, and is bent toward an outer peripheral side from an end on the axial drive source side of the drum portion, and the extending portion Forming a base part of the
The second cover member has a fitting portion that covers the drum portion of the first cover member and fits to the drum portion at the distal end portion on the drive source side,
The first cover member and the second cover member are welded and joined to the outer peripheral side of the fitting portion and the flange portion,
The starting device according to claim 4. When the drum portion and the fitting portion of the second cover member are fitted to the drum portion of the first cover member and the fitting portion of the second cover member, respectively provided with step portions that contact each other in the axial direction.
The starting device according to any one of claims 2 to 5, characterized in that: The rotation transmission unit includes a torque converter including a pump impeller connected to the second cover member and a turbine runner connected to an input shaft of the automatic transmission mechanism.
The starting device according to any one of claims 1 to 6, characterized in that: The rotation transmission unit includes a friction plate that is detachably engageable with the first cover member, and has a lock-up clutch that can freely lock up rotation transmission between the first cover member and the input shaft of the automatic transmission mechanism.
The starting device according to claim 7. The rotation transmission unit includes a starting clutch capable of controlling a rotation engagement state between the cover unit and an input shaft of the automatic transmission mechanism.
The starting device according to any one of claims 1 to 6, characterized in that:

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