JP4080091B2 - Drive shaft manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a method of manufacturing a drive shaft comprising yokes forming part of a universal joint at both ends, and having an intermediate sliding portion by spline fitting of a male shaft member and a female shaft member, Male shaft member,
a) a hollow shaft member having one end connected to the yoke of the universal joint and having an inner diameter larger than the outer diameter of the female shaft member;
b) Manufactures a drive shaft constituted by a male spline member having a sliding spline portion slidably fitted into the spline hole of the female shaft member and a fixing portion fixed to the inner surface of the hollow shaft member. It is about how to do.
[0002]
[Prior art]
It may be desirable to allow either the male shaft member or the female shaft member to contract in the axial direction when an axial stress is applied to the drive shaft that contracts beyond a predetermined expansion / contraction stroke. For this reason, it is proposed that the male shaft member or the female shaft member is constituted by at least two parts, and these two parts are connected by a shear (shear) pin that is broken when a predetermined load is applied. . Further, the male shaft member or the female shaft member is configured by connecting the male shaft member or the female shaft member to a tube that contracts in the axial direction when a stress exceeding a predetermined load is applied in the axial direction, and is connected by a snap ring. There have also been proposed materials, key connections, metal spline fittings, or adhesives.
[0003]
[Problems to be solved by the invention]
However, in such a shear pin, there are only two portions where the connecting support portions of the two members face each other in the diametrical direction, and the load control differs from the intended one due to material fatigue of the pin during long-term use. There is a fault that becomes a thing. That is, the initial load limit is lowered. Moreover, it is difficult to control the load using a deformed tube. That is, there is a drawback that it is difficult to determine the load limit of how much the contraction is caused in the initial stage.
[0004]
Accordingly, an object of the present invention is to obtain a method for manufacturing a drive shaft of the above-described type that facilitates load control of contraction when a stress greater than a predetermined load is applied.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the manufacturing method of the drive shaft of the present invention includes:
Applying a resin coating to one of the inner surface of the hollow shaft member and the fixed portion of the male spline member,
Fit the male spline member fixed portion into the inner surface of the hollow shaft member,
The hollow shaft member and the male spline member are fixed by both a restoring force due to swelling or elasticity of the resin of the resin coating, or a restoring force due to swelling and elasticity.
[0006]
According to the method for manufacturing a drive shaft of the present invention, the load control is performed by controlling the thickness of one resin coating of the inner surface of the hollow shaft member and the fixing portion of the male spline member and the application area of the swelling accelerator for swelling the resin to be coated, for example The total opening area of the continuous grooves distributed on the surface of the mating member with which the resin coating contacts or the depressions dispersed with each other can be controlled.
[0007]
In this configuration of the present invention, when axial displacement and axial load outside the normal operating range are applied to the drive shaft, the female shaft member exceeds the sliding spline portion of the male spline member and the end surface of the female shaft member is male. The male spline member is pressed in the axial direction by engaging with the end face of the fixed portion of the spline member. When this axial load exceeds the limit of the frictional engagement holding force due to the resin coating between the inner surface of the hollow shaft member and the fixed portion of the male spline member, the male spline member is axially moved relative to the hollow shaft member. The male shaft member contracts as a whole, and the entire drive shaft contracts greatly.
[0008]
In a preferred embodiment of the present invention, a fixing spline portion is formed on the inner surface of the hollow shaft member, and the fixing portion of the male spline member is fitted to the fixing spline portion. Form. According to this configuration, relative rotation between the hollow shaft member and the male spline member can be reliably prevented.
[0009]
In another preferred embodiment of the present invention, a resin coating is applied to one of the inner surface of the hollow shaft member and the fixed portion of the male spline member, and a groove or a continuous groove is formed on the other opposing peripheral surface. Dispersed depressions are formed, and a swelling accelerator is applied to these grooves or depressions. According to this configuration, the frictional holding force can be more easily controlled by the amount of the resin coating and the swelling accelerator applied.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, a drive shaft 1 according to the present invention includes a male shaft member 4 connected to a yoke 3 (see FIG. 1B) of one universal joint 2, and a spline fitting with the male shaft member 4 And a female shaft member 8 connected to the yoke 7 of the other universal joint 6.
[0012]
According to the present invention, the male shaft member 4 includes a hollow tube 9 having one end connected to the yoke 3 of the universal joint 2, a hollow shaft member 10 connected to the other end of the hollow tube, and the hollow The shaft member 10 and the male spline member 11 that is spline-fitted are configured. In the illustrated embodiment, it is connected to the yoke of the universal joint via a hollow tube, but an embodiment in which the hollow shaft member itself is directly connected to the yoke is also possible.
[0013]
The hollow shaft member 10 is provided with a dust seal 12 that slidably contacts the outer surface of the female shaft member 8. In the illustrated preferred embodiment, the inner surface of the hollow shaft member 10 forms a fixing spline-shaped portion 13 as a spline hole having a smaller inner diameter than the outer diameter of the female shaft member 8. An annular groove 15 is formed on the inner surface 14 of the hollow shaft member 10 on the hollow tube 9 side adjacent to the fixing spline-shaped portion 13.
[0014]
The male spline member 11 is provided with a sliding spline portion 17 coated with a resin so as to be slidably fitted into the spline hole 16 of the female shaft member 8. Further, a fixing spline portion 18 that is fitted to the fixing spline shape portion of the hollow shaft member is provided in a region opposite to the sliding spline portion 17.
[0015]
According to the present invention, of the inner surface 14 of the hollow shaft member 10, preferably the fixing spline-shaped portion 13 formed on the inner surface 14 and the fixing portion of the male spline member 11, preferably the fixing spline portion 18. Resin coating 22 is applied to one side, and a swelling accelerator for swelling resin coating 22 is applied to the other side.
[0016]
In the illustrated embodiment, continuous grooves or recesses 19 dispersed in each other are formed on the surface to which the swelling accelerator is applied, and in the illustrated embodiment, continuous spiral grooves 19 are formed, and the spiral grooves 19 are entirely or partially swollen. Apply accelerator. Instead of the spiral groove 19, a plurality of annular grooves separated from each other or a plurality of depressions dispersed from each other may be formed. After the fixing part of the male spline member is inserted into the inner surface of the hollow shaft member, the resin coating that comes into contact with the swelling accelerator swells, and the swelling force is fixed by frictional engagement between the two together with the restoring force due to the elasticity of the resin coating. Is produced. When a swelling accelerator is applied to continuous grooves or dents dispersed in each other, the resin of the resin coating part facing this part enters into the continuous grooves or dents dispersed from each other due to swelling and exerts a holding force. Make sure.
[0017]
In the preferred embodiment of FIG. 1, as shown in an enlarged view in FIG. 2, continuous grooves or indentations 19 dispersed with one another are formed by cutting (see FIG. 2 (a)) or rolled. It is formed by processing (see FIG. 2B). When the groove is formed by rolling, it is preferable to form a slight protrusion on the large spline diameter side along the edge of the groove as shown in FIG. The cross-sectional shape of the groove can be any shape such as an arc shape, a square shape, or a tapered shape.
[0018]
Resin coating that comes into contact with the swelling promoter after the hollow shaft member and the fixed portion of the male spline member are fitted to each other by applying the swelling promoter to the continuous grooves or the recesses 19 dispersed in each other. 2 (c) and 2 (d), the hollow shaft member 10 and the male spline member 11 are formed by part of the resin coating 22 entering a continuous groove or a recess 19 dispersed with each other. It is more reliably connected with a predetermined holding force.
[0019]
In order to prevent the hollow shaft member and the male spline member from being unintentionally disconnected during normal use, the peripheral edge of the stopper plate 20 is fitted into the annular groove 15 formed in the hollow shaft member 10, and the normal male spline is thus fitted. It is preferable to prevent the member 11 from entering the hollow tube 9.
[0020]
Generally, the axial displacement of the drive shaft during normal use of vehicles such as automobiles, agricultural machinery vehicles, industrial machinery vehicles, construction machinery vehicles, etc. is 0 to 200 mm, and the axial load of the drive shaft during normal use is When the displacement and load in the axial direction exceeding the displacement amount and load value are applied and the sliding spline portion 17 contracts more than the set value, the end surface 8a of the female shaft member 8 is male. It engages with the end surface of the fixed part of the spline member 11, releases the fixing by frictional engagement by resin coating between the inner surface of the hollow shaft member 10 and the fixed part of the male spline member 11, and the male spline member 11 is connected to the hollow shaft. The member 10 is slid in the axial direction.
[0021]
Further, in order to ensure that the female shaft member 8 is engaged with the end face of the fixing portion of the male spline member 11, the fixing portion of the male spline member or the fixing spline portion 18 is arranged radially outside the female shaft member 8. It is preferable to provide an annular guide groove 21 that is larger than the diameter and in which the end surface of the fixing spline portion 18 accommodates the distal end portion of the female shaft member 8.
[0022]
In the embodiment in which the stopper plate 20 is attached to the annular groove 15 on the inner surface 14 of the hollow shaft member 10, the stopper plate 20 is deformed or broken, or the stopper plate 20 is detached from the annular groove 15, thereby fixing the spline portion 18. Slides relative to the hollow shaft member 10, and the male shaft member 4 contracts as a whole, that is, the entire drive shaft 1 contracts greatly.
[0023]
【The invention's effect】
Thus, according to the present invention, the load control of the contraction exceeding the limit of the normal sliding stroke of the drive shaft determines the frictional engagement holding force between the hollow shaft member and the male spline member. Of the resin coating provided on one of the fixing spline forming portion provided on the inner surface or the fixing spline portion of the male spline member or the fixing spline portion on the inner surface, and the application amount (area and / or thickness) of the swelling accelerator provided on the other Can be managed. Furthermore, it can be managed by the deformation strength or breaking strength of the stopper plate or the frictional engagement holding force with the annular groove of the stopper plate.
[Brief description of the drawings]
FIG. 1 shows a drive shaft according to the present invention, in which (a) is a side view showing a partial cross section of a main portion of the drive shaft, and (b) is a partial cross section of a universal joint on a side connected to a male shaft member. (C) is an enlarged vertical sectional view of a part of (a).
FIG. 2 is an enlarged partial sectional view of a spline fitting portion of a hollow shaft member and a male spline member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive shaft 2, 6 Universal joint 3, 7 Yoke 4 Male shaft member 5 Shaft part 8 Female shaft member 9 Hollow tube
10 Hollow shaft member
11 Male spline member
12 Dust seal
13 Spline shape part for fixing
14 Inside
15 annular groove
16 Spline hole
17 Sliding spline section
18 Fixed spline section
19 Spiral grooves (continuous grooves or dents distributed to each other)
20 Stopper plate
21 Annular guide groove
22 Resin coating

Claims (4)

A method of manufacturing a drive shaft comprising yokes forming part of a universal joint at both ends, and having an intermediate sliding portion by spline fitting of a male shaft member and a female shaft member,
The male shaft member,
a) a hollow shaft member having one end connected to the yoke of the universal joint and having an inner diameter larger than the outer diameter of the female shaft member;
b) Manufactures a drive shaft constituted by a male spline member having a sliding spline portion slidably fitted into the spline hole of the female shaft member and a fixing portion fixed to the inner surface of the hollow shaft member. In the way to
Applying a resin coating to one of the inner surface of the hollow shaft member and the fixed portion of the male spline member,
Fit the male spline member fixed portion into the inner surface of the hollow shaft member,
A drive shaft manufacturing method comprising fixing the hollow shaft member and the male spline member by a restoring force due to swelling or elasticity of the resin of the resin coating, or a restoring force due to swelling and elasticity. The drive shaft according to claim 1, wherein a fixing spline-shaped portion is formed on an inner surface of the hollow shaft member, and the fixing portion of the male spline member is formed as a fixing spline portion that is fitted to the fixing spline-shaped portion. Production method. The resin coating is applied to one of the inner surface of the hollow shaft member and the fixed portion of the male spline member, and grooves or depressions distributed on the other opposing peripheral surface are formed. Manufacturing method of drive shaft. 4. The resin coating is applied to one of the inner surface of the hollow shaft and the fixed part of the male spline member, and a swelling accelerator for swelling the resin of the resin coating is applied to the other. A method for manufacturing a drive shaft according to claim 1.

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