JPH03134321A - Clutch hub - Google Patents

Abstract

PURPOSE:To conduct oil to the outer periphery with good efficiency to prevent seizure by providing a flange on one end of a cylindrical portion, boring an oil passage hole in the outer peripheral surface of the cylindrical portion, and forming a weir on the whole periphery of the inner peripheral surface end portion on the opposite side to the above flange portion. CONSTITUTION:A cylindrical portion 11 which is a main body of a clutch hub has a flange portion 12 projected outside on one end thereof. The cylindrical portion 11 is constructed so that the inner peripheral surface 13 is a smooth surface, an axial spline tooth 14 and an oil passage hole 15 piercing in the radial direction are formed on the outer peripheral surface, and a weir 16 for oil is formed extending over the whole periphery of the end portion on the opposite side to the flange portion 12. By this arrangement, during rotation of a clutch hub 11, oil 22 is turned round the whole inner peripheral surface 13 as a uniform oil film by the centrifugal force, and the outflow from the end portion of the inner peripheral surface 13 is dammed. An enough quantity of oil is conducted with good efficiency to the outer peripheral surface side through the oil passage hole 15 to be supplied to the frictional engagement surface of a drive plate 6 and a driven plate 7, so that seizure can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a clutch hub used in an automatic transmission of an automobile.

<Prior Art> As shown in FIG. 9, this type of clutch hub 1 is formed into a substantially bottomed cylindrical shape by drawing in a press, and has spline teeth extending from the inner circumferential surface to the outer circumferential surface. 2 is formed into a wave shape. The clutch drum 4 is disposed inside the clutch drum 4 that is engaged with the output shaft 3, and is fixed to the input shaft 5. Further, 6 is a drive plate, and 7 is a driven plate arranged alternately with the drive plate 6, and the drive plate 6 is engaged with the spline teeth 2 on the outer peripheral surface of the clutch hub 1 so as to be movable in the axial direction. , a driven plate 7 is engaged with spline teeth 8 formed on the inner peripheral surface of the clutch drum 4 so as to be movable in the axial direction. Therefore, by driving the piston 9 provided in the cylinder of the clutch drum 4, each plate 6.7 is frictionally engaged or disengaged, and the transmitted torque is turned on and off.

By the way, the latch hub 1 has a plurality of holes 10 that serve as oil passages in the mountain portions of the spline teeth 2 on the outer peripheral surface, that is, in the valley portions on the inner peripheral surface, and the centrifugal force caused by the rotation of the latch hub 1 causes oil to flow into the clutch. The oil is sent to the inner peripheral surface of the hub and guided to the outer peripheral surface through the oil passage hole 10, so that oil is supplied to the frictional engagement surfaces of each plate 6.7.

<Problems to be Solved by the Invention> However, in such a conventional clutch knob 1, since it is formed in a cylindrical shape with one end surface open, most of the oil transmitted through the valleys on the inner circumferential surface is oil. It is not guided from the passage hole 10 to the outer peripheral surface, but flows out from the open end.For this reason,
There is a problem in that the supply of oil to the frictional engagement surfaces between the drive plate 6 and the driven plate 7 is insufficient, resulting in seizure of each plate 6, 7 and friction galling of the spline teeth 2.

Therefore, the present invention provides a clutch hub with a structure that can efficiently supply oil to the outer peripheral surface side and prevent seizure of the frictional engagement surface between the drive plate and the driven plate and friction galling of the spline teeth. The purpose is to provide

Means for Solving the Problems> In order to solve the above-mentioned problems, the clutch hub according to the present invention is a clutch hub formed by plastic working a sheet metal, and has a cylindrical portion extending outwardly at one end of the cylindrical portion. It has a protruding flange part, spline teeth are formed in the axial direction on the outer peripheral surface of the cylindrical part, and passage holes for oil are bored in the radial direction, and the end of the inner peripheral surface on the opposite side from the flange part. The feature is that a weir for oil is formed around the entire circumference.

Effect> By forming the dam around the entire circumference of the end of the inner circumferential surface of the clutch hub, the outflow of oil from the end of the inner circumferential surface is blocked when the clutch knob is rotated.

Therefore, the oil circulates around the entire inner peripheral surface of the clutch hub in the form of a substantially uniform film, and a sufficient amount of oil is efficiently guided to the outer peripheral surface through the oil passage hole.

<Embodiment> FIGS. 1 and 2 show an embodiment of a clutch hub according to the present invention.

In these figures, 11 is a cylindrical part that is the main body of the clutch hub, and a blank part 1 is provided at one end of the cylindrical part that protrudes outward.
It has 2. The cylindrical portion 11 has an inner circumferential surface 13 that is a smooth surface, and spline teeth 14 extending along the axial direction and passage holes 15 for oil passing through the cylindrical portion 11 in the radial direction are formed on the outer circumferential surface.
A weir 16 for oil is formed around the entire circumference at the end of the inner peripheral surface 13 opposite to the blank part 12.

This clutch hub is formed by plastic working as follows. This will be explained below with reference to FIGS. 3 to 5. In these figures, 17 is a die, 18 is a blank holder, 19 is a first punch that is inserted vertically into the die 17, and 2o has an upper half slightly larger than the outside diameter of the first punch 19; a second punch having a stepped shape in the middle, 21;
is blank.

First, as shown in FIG. 3, a blank 21 which has been cylindrically drawn in advance is placed with its flange portion 12 on the upper surface of the die 17, and is fixed with a blank holder 18.
Set to . Next, as shown in FIG. 4, by lowering the first punch 19 and inserting it into the cylindrical part 11, the cylindrical part 11 is pressed outward and the inner peripheral surface 13 is formed into a straight round hole shape. At the same time, spline teeth 14 are formed on the outer peripheral surface. Next, the first punch 19 is
Instead of the punch 20 shown in FIG.
By squeezing the inner peripheral surface 13 of the second punch 20,
The inner circumferential surface 13 of the cylindrical portion is thickened toward the lower end side to form a weir 16 over the entire circumference at a position corresponding to the stepped portion of the second punch 20. Note that this dam 16 may protrude to the extent that it can maintain an oil film on the inner circumferential surface 13 of the clutch hub. As shown in FIGS. 6 and 6A, thin spline teeth 14
An oil passage hole 15 is bored in the valley part.

In the plastic working in this embodiment, after forming the spline teeth 14 on the outer peripheral surface of the cylindrical portion 11, the weir 16 is formed on the inner peripheral surface 13.
Although the two steps are illustrated as ironing to form the spline teeth, if the spline teeth are low, the spline teeth 14 can be formed by using a punch such as a combination of the first punch 19 and the second punch 20 described above. and weir 16
It is also possible to perform the molding in a Lee process using a single punch, thereby reducing the number of man-hours.

In this way, in the clutch hub in the above embodiment Fl, the inner circumferential surface 13 is
As shown in FIG.
When the clutch hub 11 rotates, the centrifugal force causes the oil 22 to smoothly rotate around the entire circumference of the inner circumferential surface 13, and also prevents the oil 22 from flowing out from the end of the inner circumferential surface 13 of the cylindrical portion. That is, the oil 22 circulates around the entire clutch hub inner peripheral surface 13 in the form of a substantially uniform oil film, and a sufficient amount of oil is efficiently guided to the outer peripheral surface through the oil passage hole 15. Therefore, oil 22 can be sufficiently supplied to the frictional engagement surfaces of drive plate 6 and driven blade 7.

Further, according to this embodiment, since the weir 16 is provided so as to protrude only on the inner circumferential surface 13 side, there is no need to change the basic tooth shape of the spline teeth 14 on the outer circumferential surface, and there is no margin in terms of dimension setting. The spline teeth 14 on the outer peripheral surface can be utilized to the maximum.

Further, according to this embodiment, by forming the inner circumferential surface 13 into a round hole and forming the spline teeth 14 on the outer circumferential surface by plastic working, the rigidity is increased and vibration is increased compared to a clutch hub in which the spline teeth are formed in a wave shape. There are advantages such as reduced noise.

The above embodiment is an example in which the present invention is applied to a latch hub with a smooth inner circumferential surface. However, as shown in FIG. 8 and FIG. The present invention can also be applied to a clutch hub 31 formed in a corrugated shape. In this case, the punches used are the first and second punches in the above embodiment with tooth profiles formed on their outer peripheral surfaces, and the weir 31a is made by the same steps as shown in FIGS. 3 to 5. be able to. Similarly, spline teeth and a weir can be formed simultaneously in one step by using a punch having a step in the middle. In the case of this embodiment, the oil passage hole 31b is formed in a mountain portion of the spline tooth when viewed from the outside.

<Effects of the Invention> As described above, the clutch hub of the present invention has a flange portion protruding outwardly at one end of the cylindrical portion, and spline teeth are formed in the axial direction on the outer peripheral surface of the cylindrical portion. At the same time, passage holes for oil are drilled in the radial direction, and a dam for oil is formed around the entire circumference at the end opposite to the flange on the inner circumferential surface, so that the oil can be used to release the clutch hub. It reliably prevents oil from flowing out from the edges, forms an almost uniform oil film over the entire inner circumferential surface, and efficiently guides a sufficient amount of oil to the outer circumferential surface through the oil passage holes. Seizing of the friction engagement surface with the driven plate and friction galling of the spline teeth can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a clutch hub according to the present invention, and FIG. 2 is a sectional view of the same clutch hub.
3 to 5 are schematic explanatory diagrams showing the processing steps of the clutch hub, FIG. 6 is a cross-sectional view of the clutch hub after the same processing, FIG. 6A is a partial plan view of FIG. 6, and FIG. 8 is a sectional view of a clutch hub showing another embodiment of the present invention; FIG. 8A is a partial plan view of FIG. 8; FIG. 9 is a partial sectional view for explaining a conventional clutch hub. 11... Cylindrical part, 12... Flange part, 13...
Inner peripheral surface, 14... Spline tooth, 15.31b...
Oil passage hole, 16,312...Weir.

Claims (1)

[Claims] A clutch hub formed by plastic processing of sheet metal,
It has a flange portion projecting outward at one end of the cylindrical portion,
spline teeth are formed in the axial direction on the outer peripheral surface of the cylindrical portion, and passage holes for oil are bored in the radial direction;
A clutch hub characterized in that a weir for the oil is formed around the entire circumference at an end portion of the inner peripheral surface opposite to the flange portion.