JP5069594B2 - Hydraulic clutch housing and method of manufacturing hydraulic clutch housing - Google Patents

Description

  The present invention relates to a hydraulic clutch housing used for dual speed switching and the like, and a method of manufacturing the hydraulic clutch housing.

2. Description of the Related Art Conventionally, a hydraulic clutch housing that houses a piston and a clutch plate is integrally formed of a casting. In recent years, a technique has been developed in which a housing formed of a casting is made of sheet metal (for example, Patent Document 1).
In Patent Document 1, a cylindrical housing cylinder is formed of metal or the like, the housing cylinder is joined to a boss portion of an input shaft, and a piston or a clutch plate is accommodated in the housing cylinder. . The housing cylinder includes a vertical wall (annular end wall 5) extending radially outward from the input shaft, and a cylindrical wall (large diameter cylinder) extending in the axial direction via a bent portion bent from the vertical wall. 3 and a small diameter cylinder 4).
JP-A 64-35123

Now, in a transmission such as a vehicle, a dual clutch is used for high / low speed switching and forward / backward switching, and a sheet metal housing is also desired in the field of such a dual clutch.
When the housing of the dual clutch is made of sheet metal, the two housing cylinders shown in Patent Document 1 can be back-to-back and joined together by welding.
When integrating the two housing cylinders with the vertical walls back to back, the inner diameter ends (near the mounting holes 5a) of the vertical walls of the housing cylindrical bodies are joined together by welding, and on the opposite side of the mounting holes It is conceivable to join the outer end portions (bent portions) of the vertical walls by welding from the outside.

However, when the two housing cylinders are integrated, if the bent portions are welded with the groove as the groove, heat is directly transmitted to the piston housing portion and the clutch plate housing portion, which easily causes welding distortion and makes welding difficult. Problem arises.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a housing for a hydraulic clutch that is obtained by integrating the housing cylinders back to back, and welding them together in the piston housing part and the clutch plate housing part. .
Further, the present invention provides a hydraulic system capable of producing a housing with less welding distortion in the piston housing portion and the clutch plate housing portion when the housing is manufactured by welding the housing cylinders back to back and integrating them together by welding. It is an object of the present invention to provide a method for manufacturing a clutch housing.

In order to achieve the above object, the present invention takes the following technical means. In other words, the technical means of the present invention comprises a pair of sheet metal housing cylinders formed back and back, each having a clutch plate housing part and a piston housing part for housing a piston. Includes a vertical wall extending in the radial direction, and a cylindrical wall extending in the axial direction via a bent portion of a radially outer end of the vertical wall to form the clutch plate storage portion and the piston storage portion. An annular oil supply recess that is concave in the axial direction and supplies hydraulic oil is formed on the back surface of the piston that faces the vertical wall , and the radially inner end of the vertical wall is is joined to the clutch boss portion, said vertical wall radially outward of the and in the annular oil supply in the recess in the radially inward vicinity of the bent portion is joined to the annular by electron beam welding in the sheet metal of the housing cylinder There is in point.
In addition, it is preferable that a plurality of welded portions on the radially outer side of the vertical wall are formed in the radial direction, and the joining ranges of the welded portions overlap in the radial direction.
Moreover, it is preferable that the radial joining range in the welded portion on the outer diameter side of the vertical wall is smaller than the radial width of the oil supply recess.

According to this, a housing in which the back-to-back housing cylinders are integrated by joining the outside diameters of the vertical walls apart from the cylinder walls forming the clutch plate storage part and the piston storage part by electron beam welding. Is configured.
In such a housing, since the outer diameter of the vertical wall away from the cylindrical wall is joined by an electron beam, the clutch plate storage portion and the piston storage portion are very small in distortion caused by welding. The strength is high while maintaining the roundness inside.
It is preferable that the welded portion on the outer diameter side of the vertical wall corresponds to an oil supply recess for supplying hydraulic oil formed on the back surface of the annular piston housed in the piston housing portion.

According to this, the welded mass after welding does not contact the piston in the welded portion outside the diameter of the vertical wall, and the movement of the piston is not affected.
It is preferable that a plurality of welded portions of the vertical wall are formed in the radial direction, and the joining range of each welded portion overlaps in the radial direction. According to this, since the outside diameters of the vertical walls are firmly joined together, the joining strength of the housing cylinder can be improved.
The technical means in the method of the present invention includes a longitudinal wall extending in the radial direction and an axial direction extending through a bent portion of a radially outer end portion of the longitudinal wall to accommodate the clutch plate storage portion and the piston. When joining a pair of cylindrical sheet metal housing cylinders having a cylindrical wall that forms a piston housing part, the back surface of the piston facing the vertical wall is concave in the axial direction. previously formed an oil supply annular recess for supplying hydraulic oil Te, bonded by welding radially inner end portions of the vertical wall between the vertical wall and back to back in the sheet metal of the housing cylinder to the clutch boss to Rutotomoni, certain radially outward side of the vertical wall to the point of bonding to the ring by electron beam welding in the oil supply within the recess and the annularly radially inward vicinity of the bent portion.

According to this, when manufacturing a housing by welding the outer diameter of the vertical wall with an electron beam and integrating the back-to-back housing cylinders, the outer diameter of the vertical wall is joined by electron beam welding. Is difficult to be transmitted to the cylinder wall (clutch plate storage part and piston storage part) through the bent part, so that the welding distortion of the cylinder wall can be made extremely small, and the roundness within the cylinder wall is maintained. Can be manufactured.
The welding by the electron beam is preferably performed a plurality of times while changing the position in the radial direction of the vertical wall so that the joining range overlaps in the radial direction. According to this, the outer diameter side of a vertical wall can be joined firmly.

  According to the housing of the hydraulic clutch of the present invention, the piston housing portion and the clutch plate housing portion are less subject to welding distortion. Further, according to the method for manufacturing a housing for a hydraulic clutch of the present invention, a housing with less welding distortion can be manufactured in the piston storage portion and the clutch plate storage portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an overall view of a clutch provided with a hydraulic clutch housing according to the present invention. The clutch is a dual speed clutch used in a vehicle transmission such as a tractor, and the vehicle transmission is switched between high and low speeds. It is used for use and for forward / reverse switching.
The hydraulic clutch 1 includes a first output transmission member (gear) 4 that supports the power of a rotatable input shaft 2 on one end side (left side) of the input shaft 2 so as to be relatively rotatable by a bearing 3, and the input. The other end (right side) of the shaft 2 can be transmitted to a second output transmission member (gear) 11 supported by the bearing 5 so as to be relatively rotatable.

A clutch boss portion 7 projecting radially outward for joining the housing 6 is integrally formed on the outer peripheral portion of the input shaft 2. The input shaft 2 is provided with a hydraulic oil supply passage 9 for supplying hydraulic oil for operating a pair of annular pistons 8L and 8R that are movably provided in the housing 6, and for supplying lubricating oil. An oil supply path 10 is formed.
The housing 6 is provided with a pair of sheet metal housing cylinders 12L and 12R formed in a cylindrical shape with one open and the other closed, and the closed sides of the housing cylinders 12L and 12R are joined back to back. It is comprised by doing.

The left housing cylinder 12L is disposed on the same axis as the input shaft 2 so that the open side is on the left side, and the clutch disk mounting of the first output transmission member 4 to which a plurality of disc-shaped clutch disks 13 are mounted. The part 14 is arrange | positioned inside.
The left housing cylinder 12L includes a clutch plate housing portion 16 that houses a plurality of disc-shaped clutch plates 15 disposed on the left side, and a piston housing portion 17 that houses an annular piston 8L disposed on the left side. It has.
On the other hand, the right housing cylinder 12R is arranged on the same axis as the input shaft 2 so that the open side faces the right side, and the clutch of the second output transmission member 11 to which a plurality of disc-shaped clutch disks 13 are attached. A disk mounting portion 14 is disposed inside. The right housing cylinder 12R includes a clutch plate housing portion 16 that houses a plurality of disc-shaped clutch plates 15 disposed on the right side, and a piston housing portion 17 that houses an annular piston 8R disposed on the right side. It has.

Each housing cylinder 12L, 12R has a vertical wall 20 extending radially outward from a clutch boss portion 7 provided on the input shaft 2 and a bent portion 21 from the radially outer end of the vertical wall 20. A cylinder wall 22 extending in the same axial direction as the input shaft 2 is provided, and the clutch plate storage portion 16 and the piston storage portion 17 are formed by the cylinder wall 22.
The lengths of the vertical wall 20 of the left housing cylinder 12L and the vertical wall 20 of the right housing cylinder 12R are set to be the same, and the thicknesses of both the vertical walls 20 are also set to be the same. The bent portion 21 of the left housing cylinder 12L and the bent portion 21 of the right housing cylinder 12R have an R shape having the same radius, and gradually bend in the axial direction from the radially outer end of the vertical wall 20. Has been.

The cylindrical wall 22 extends from the bent portion 21 in the axial direction, and the side close to the bent portion 21 (base end side) of the cylindrical wall 22 is close to or in contact with the outer peripheral wall of the annular pistons 8L and 8R on its inner surface. The intermediate portion is provided with an enlarged portion 23 whose diameter increases toward the tip, and the clutch plate storage portion 16 has a diameter larger than that of the piston storage portion 17 through the enlarged portion 23.
A portion surrounded by the annular pistons 8L, 8R, the vertical wall 20 and the cylindrical wall 22 is a hydraulic oil supply section 25 to which hydraulic oil is supplied from the hydraulic oil supply path 9, and is supplied to the hydraulic oil supply section 25. When the outer peripheral surfaces of the annular pistons 8L and 8R (particularly, the inclined surface 26 near the vertical wall 20) are pushed by the hydraulic oil, the annular pistons 8L and 8R move in the axial direction. In the annular pistons 8L and 8R, an endless oil supply recess 28 extending in the entire circumferential direction is formed on the radially outer end side of the opposing surface (back surface) facing the vertical wall 20 in the annular pistons 8L and 8R. The hydraulic oil supplied to the hydraulic oil supply unit 25 flows through the gap between the vertical wall 20 and the annular pistons 8L and 8R to the oil supply recess 28.

  As shown in FIGS. 1 and 2, the inner radial end portions 29 of the vertical wall 20 of the left housing cylinder 12L and the vertical wall 20 of the right housing cylindrical body 12R are aligned, and the respective inner radial ends 29 are Joined by arc welding or electron beam welding. Further, the radially outer sides of the vertical wall 20 opposite to the radially inner end portion 29 are also joined. Specifically, in the vertical wall 20, the radially outer end portions of the two bent portions 21 are aligned, and a position 30 corresponding to the oil supply recess 28 that is inward of the bent portion 21 and in the vicinity of the bent portion 21. In the following description (hereinafter, sometimes referred to as a radially outer joint portion 30), both of the vertical walls 20 are joined to each other by electron beam welding.

As shown in FIG. 2, in this embodiment, there are two ingots 31 of the radially outer joint 30 that are displaced in the radial direction, and the vertical walls 20 are joined together by two-point welding in the radial direction. It has become. That is, in the radially outer joint portion 30, a part of the joining range L1 of the first welded ingot 31 (welded part) and a part of the joining range L2 of the second welded ingot 31 (welded part) are: The vertical walls 20 are joined at different positions in the radial direction so as to overlap each other in the radial direction.
The total width L3 of the joining range in the radially outer joint portion 30 is a range smaller than the radial width L4 of the oil supply recess 28. That is, the range L3 of the metal melted by the joining is smaller than the radial width L4 of the oil supply recess 28, and does not protrude from the oil supply recess 28 in the radially outward direction in a sectional view. In addition, if the total width L3 of the joining range in the radially outer joint portion 30 is within the width L4 of the oil supply recess 28, the joining points in the radial direction of the vertical wall 20 are not limited to two points, and even more than that. Good.

In order to manufacture the housing 6 of the hydraulic clutch 1, first, the housing cylinders 12L and 12R made of cylindrical sheet metal are prepared, and the vertical walls 20 of the housing cylinders 12L and 12R are back to back (the vertical wall 20). The outer peripheral surfaces of each other are matched with each other).
When the vertical walls 20 are back to back, the radially inner ends 29 of the vertical walls 20 are aligned, and the radially outer side of the bent portion 21 is aligned. Then, with the vertical walls 20 back to back, the inner cylindrical end portions 29 of the vertical walls 20 are joined together by electron beam welding while rotating the housing cylinders 12L and 12R or the electron beam, and the annular pistons 8L and 8R. The radially outer joint 30 corresponding to the oil supply recess 28 is joined by electron beam welding.

In the joining of the radially outer joint portion 30 by the electron beam, electron beam light is irradiated from the inner surface side of one (left side) vertical wall 20 in a state where the vertical walls 20 are superposed in the thickness direction. At this time, the electron beam passes through one (left side) vertical wall 20 and reaches the other (right side) vertical wall 20 (until the metal melts in the range from the left vertical wall 20 to the right vertical wall 20). Do. Joining with the molten metal is performed over the entire circumference of the vertical wall 20. Moreover, the joining operation | work which joins the vertical wall 20 over a perimeter, ie, the welding operation | work which joins the radial outside junction part 30, is performed in multiple times (for example, twice).
As shown in FIG. 2, when the first welding operation is completed, a part of the joining range L1 of the first welding part and a part of the joining range L2 of the second welding part are over in the radial direction. The position where the electron beam is irradiated is shifted in the radial direction so as to wrap, and the second welding operation for joining the vertical wall 20 over the entire circumference is performed again.

When the joining of the vertical wall 20 is completed, the radially inner end portion 29 of the vertical wall 20 is welded to the clutch boss portion 7 formed on the input shaft 2. The operation of welding the inner diameter end portion 29 of the vertical wall 20 to the clutch boss portion 7 may be the same as the operation of joining the inner diameter end portion 29 of each vertical wall 20 by welding.
As described above, according to the present invention, the operating oil is supplied to the operating oil supply path 9 of the input shaft 2 and is sent to the operating part supply unit 25 and the oil supply recess 28, whereby the annular pistons 8L and 8R are axially moved. The clutch plate 15 is pressed by the annular pistons 8L and 8R, the clutch plate 15 and the clutch disc 13 are pressed against each other, and the clutch can be brought into a connected state. On the other hand, when the supply of hydraulic oil is stopped, the annular pistons 8L and 8R are returned by the urging force of the urging members (for example, spring members) interposed between the annular pistons 8L and 8R and the input shaft 2, and the clutch plate 15 The pressure contact with the clutch disk 13 is released, and the clutch can be brought into a disconnected state.

  According to the present invention, when the vertical wall 20 of the left housing cylinder 12L and the vertical wall 20 of the right housing cylinder 12R are joined, the position farther from the piston housing portion 17 than the bent portion 21, that is, the bent portion 21. Since the distance between the cylindrical wall 22 and the radially outer joint 30 is long, the heat at the time of welding is not easily transmitted to the cylindrical wall 22, The cylindrical wall 22 is not deformed in the radial direction or the like due to heat during welding, and the distortion in the clutch plate storage portion 16 and the piston storage portion 17 is very small (no welding distortion). Since the radial distortion in the cylindrical wall 22 is very small, the clutch plate 15 fits well in the clutch plate housing portion 16, and no correction after welding is required.

In integrating the left housing cylinder 12L and the right housing cylinder 12R, the two portions of the vertical wall 20 on the inner diameter side and the outer diameter surface are welded, so the strength (joint strength) of the integrated housing 6 is The deformation of the bent portion 21 in the radial direction during the operation of the annular pistons 8L and 8R and the deformation of the open side of the cylindrical wall 22 during the pressure contact between the clutch plate 15 and the clutch disk 13 can be prevented.
Furthermore, in joining the vertical wall 20 of the left housing cylinder 12L and the vertical wall 20 of the right housing cylinder 12R, at least two points of the radially inner side and the radially outer side are joined. It has almost the same strength as the integrated one.

Moreover, since the outer diameter joint portion 30 is located at a position corresponding to the oil supply recess 28, the stored annular pistons 8L and 8R are prevented from coming into contact with the welded mass 31 after welding of the outer diameter joint portion 30. Even when the walls 20 are welded together, the annular pistons 8L and 8R can be moved smoothly, and the movement of the annular pistons 8L and 8R is not affected. Since the joining range of the radially outer joint portion 30 is overlapped in the radial direction, the radially outer sides of the vertical wall 20 can be firmly joined.
In addition, this invention is not limited to the said embodiment. For example, the electron beam welding may be performed at a plurality of locations separated in the radial direction, or may be performed not only from the left housing cylinder 12L side but also from the right housing cylinder 12R side.

  The left housing cylinder 12L and the right housing cylinder 12R may have different outer diameters. In that case, the vicinity of the outer diameter end of the small-diameter vertical wall 20 is welded. Further, the clutch boss portion 7 and the input shaft 2 may be formed separately.

1 shows an overall view of a clutch provided with a hydraulic clutch housing of the present invention. A partial enlarged view of the housing is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic clutch 2 Input shaft 6 Housing 7 Clutch boss part 8L Annular piston 8R Annular piston 12L Left side housing cylinder 12R Right side housing cylinder 15 Clutch plate 16 Clutch plate accommodating part 17 Piston accommodating part 20 Vertical wall 21 Bending part 22 Cylindrical wall 28 Oil supply recess 29 Inner diameter end 30 of the vertical wall Outer diameter joint 31 Weld lump (welding range)

Claims (5)

A pair of sheet metal housing cylinders that are formed in a cylindrical shape and have a clutch plate accommodating part and a piston accommodating part that accommodates a piston are provided back to back, and each of the housing cylinders includes a vertical wall extending in a radial direction, A cylindrical wall that extends in the axial direction through a bent portion of the radially outer end of the vertical wall and forms the clutch plate storage portion and the piston storage portion,
An annular oil supply recess that is concave in the axial direction and supplies hydraulic oil is formed on the back surface of the piston facing the vertical wall,
Diameter inner end portion of the longitudinal wall is joined to the clutch boss, radially outward of the longitudinal wall in the sheet metal of the tubular shell body and in the annular oil supply in the recess in the radially inward vicinity of the bent portion A hydraulic clutch housing characterized by being joined in an annular shape by electron beam welding. 2. The hydraulic clutch housing according to claim 1, wherein a plurality of welded portions on the radially outer side of the vertical wall are formed in a radial direction, and a joining range of the welded portions overlaps in the radial direction. 3. The hydraulic clutch housing according to claim 1 , wherein a radial joining range of a welded portion on a radially outer side of the vertical wall is smaller than a radial width of the oil supply recess . A vertical wall extending in the radial direction, and a cylindrical wall extending in the axial direction via a bent portion at the outer end of the vertical wall to form the clutch plate storage portion and the piston storage portion for storing the piston; When joining a pair of cylindrical housings made of sheet metal ,
An annular oil supply recess that is concave in the axial direction and supplies hydraulic oil is formed in the back surface of the piston facing the vertical wall, and the vertical walls in the sheet metal housing cylinder are formed. the in back to back electrons radially inner end portions of the vertical wall the rewritable welded to the clutch boss, and in the annular oil supply in the recess in the radially inward vicinity of the bent portion of the radially outer side of the vertical wall A method of manufacturing a housing for a hydraulic clutch, characterized by joining in an annular shape by beam welding.   5. The manufacture of a hydraulic clutch housing according to claim 4, wherein the welding by the electron beam is performed a plurality of times while changing the position of the vertical wall in the radial direction so that the joining range overlaps in the radial direction. Method.

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