JPH07248025A - Propeller shaft - Google Patents

Abstract

PURPOSE:To provide a series of propeller shafts having different torsional rigidities by narrowing the gap between a spline sleeve and an outer tube, and by inserting a rubber element in a caved surface formed in the outer surface of the spline sleeve. CONSTITUTION:A spline shaft 14 is connected to a spline yoke 13, and an outer tube 19 is arranged around the outer peripheral surface of a spline sleeve 16 fitted on a spline 15, and is welded to one end part of a weld yoke 22. Further, a rubber element 24 is interposed between the spline sleeve 16 and the outer tube 19. In this case, the rubber element 24 is inserted in a caved surface 25 which is formed in the central part of the outer peripheral surface of the spline sleeve 16 in a range facing the outer tube 19. Further, a bushing 26 formed of a lubricantless resin sheet is bonded on opposite sides of the caved surface 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft that transmits rotation from a motor, which is driven by rotation, such as a vehicle engine, to wheels and a hydraulic pump motor.

[0002]

2. Description of the Related Art An example of this propeller shaft will be described with reference to a bus shown in FIG. 2. An engine 2 is mounted on a rear portion of a bus body 1, and a rotation of the engine 2 is changed by a transmission 3.

The rotation of the transmission 3 is transmitted to the propeller shaft 10, the propeller shaft 10 to the differential gear 5, and further from the differential gear 5 to the wheels 4.

The rotation of the differential gear 5 is
It is also transmitted to another propeller shaft 10, and the propeller shaft 10 transmits rotation to the gear clutch 9. The gear clutch 9 transmits or interrupts the rotation of the propeller shaft 10 to the hydraulic pump motor 8, and the hydraulic pump motor 8 pressurizes the oil in the oil tank 6, and the pressurized oil is accumulated in the accumulator 7. To be done.

Although the propeller shaft 10 is used in this way, the distance between the differential gear 5 and the transmission 3 and between the differential gear 5 and the gear clutch 9 is increased or decreased due to vertical vibrations of the wheels 4 during traveling. To do.

Therefore, the propeller shaft 10 needs to be expanded and contracted in accordance with this increase and decrease, and also the rotation is transmitted to the next transmission side. To allow this expansion and contraction,
By fitting the spline shaft and the spline sleeve, the propeller shaft 10 can be expanded and contracted in the axial direction, and the transmission of rotation is not hindered.

Recently, noise such as engine noise tends to be reduced, and accordingly, there is an increasing need to reduce noise of a propeller shaft. Therefore, a propeller shaft using a rubber element tends to be used.

An example of such a propeller shaft is shown in FIG.
And described below. In this propeller shaft, a bendable universal joint 12 is connected to a flange yoke 11, a spline yoke 13 is coupled to the universal joint 12, and a spline shaft 14 is provided continuously to the spline yoke 13.

The spline shaft 14 is the shaft 14
A spline 15 is formed near the tip of a. The spline formed on the inner surface of the spline sleeve 16 is fitted to the spline 15 of the spline shaft 14.

By this fitting, the spline shaft 1
The rotation between the spline sleeve 4 and the spline sleeve 16 is transmitted, and the spline sleeve 16 is slidable in the axial direction. A seal 17 is provided on the spline yoke 13 side between the inner surface of the spline sleeve 16 and the outer surface of the spline shaft 14.

A snap ring 18 is inserted on the outer side of the seal 17 in the front-rear direction to prevent the seal 17 from coming off and preventing dust from entering between the shaft 14 and the spline sleeve 16.

An outer tube 19 is arranged on the outer peripheral surface of the spline sleeve 16, and an end portion of the spline sleeve 16 on the spline yoke 13 side and the outer tube 19 are welded at a weld A portion.

A bendable universal joint 21 is connected to one of the flange yokes 20, and a weld yoke 22 is connected to the universal joint 21.

The end face of the inner tube 23 on the base end side is welded to the end of the weld yoke 22 by a weld B portion. A rubber element 24 that elastically relieves twisting is vulcanized and bonded to the outer peripheral surface of the inner tube 23.

Then, the inner tube 23 to which the rubber element 24 is vulcanized and bonded is press-fitted into the outer tube 19, and the rotation of the outer tube 19 is transmitted to the inner tube 23 by the friction between the rubber element 24 and the outer tube 19. However, the weld yoke 22 is rotated.

This rubber element 24 reduces the torsional rigidity value of the propeller shaft and sets the resonance point to an appropriate value to meet the needs of vehicle noise reduction.

[0017]

In this propeller shaft, imbalance may occur due to welding of the outer tube 19 and the inner tube 23.

This imbalance is promoted by the centrifugal force due to the increase in the rotation speed, and the rubber element 24 is rotated at a high speed.
The propeller shaft has a drawback in that it cannot increase the number of revolutions at a high speed because the bending occurs in the shaft and the vibration occurs.

In such a propeller shaft, the torsional rigidity is changed depending on the thickness of the rubber element. Therefore, in order to meet the required torsional rigidity, the diameter of the inner tube 23 or the outer tube 19 and its related parts must be changed according to the thickness of the rubber element.

On the other hand, the propeller shaft has different required torsional rigidity values depending on the vehicle type, and in order to correspond to the required torsional rigidity values, there are several types of rubber elements having different thicknesses and the like. The propeller shaft must be prepared and placed.

Therefore, this propeller shaft could not be made into a series. The present invention is to solve the problems of the above-mentioned conventional propeller shaft,
The purpose is to enable a series of propeller shafts and to increase the maximum rotation speed.

[0022]

Means for Solving the Problems The present invention provides a propeller shaft means for achieving the above object, in which a spline shaft is provided on a spline yoke, a spline sleeve is fitted to the spline shaft, and the spline sleeve is fitted to the spline sleeve. Form an interval and fit the outer tube,
The outer tube is fixed to the weld yoke, and in the propeller shaft in which the rubber element is interposed between the spline sleeve and the outer tube, the outer diameter of the spline sleeve and the inner diameter of the outer tube are formed so that the distance between them becomes narrow. On the outer surface of the spline sleeve, a recessed surface is formed in a portion other than both sides of the surface facing the outer tube, and the rubber element is housed in this recessed surface, and between the opposing surfaces not formed on the recessed surface. Is characterized by interposing a bush of a non-lubricated resin sheet material.

[0023]

In the propeller shaft according to the present invention, the thickness of the rubber element accommodated in the propeller shaft can be changed by changing the depth of the recessed surface formed on the outer peripheral surface of the spline sleeve. Can be changed.

Therefore, for the rubber element having the required torsional rigidity value, it is not necessary to change other parts only by changing the depth of the recessed surface, and it is possible to make a series of propeller shafts. .

Also, by narrowing the space between the outer tube and the spline sleeve and interposing a bush of a non-lubricated resin sheet between them, it is possible to prevent unbalance at high speed rotation, increase the number of rotations, and allow maximum rotation. You can increase the number.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. The same components as those of the conventional propeller shaft shown in FIG. To do.

In this embodiment, the inner tube 23 is not used and the outer tube 19 is welded to the weld yoke 22. The outer diameters of both sides of the spline sleeve 16 are smaller than the inner diameter of the outer tube 19, and have a dimensional difference of 1 mm or less in radius, for example.

The outer surface of the spline sleeve 16 has a spline sleeve 16 inside the outer tube 19.
When the is inserted, a recessed surface 25 is formed with an appropriate width in the central portion of the area facing the outer tube 19.

A rubber element 24 is provided on the recessed surface 25.
Is vulcanized and adhered, and bushes 26 made of a non-lubricated resin sheet are adhered to the opposing surfaces not formed on the recessed surfaces 25 on both sides with an adhesive.

The non-lubricating resin sheet material is preferably a non-lubricating fluororesin, a polyimide resin, or a polyethylene resin, and a rubber adhesive is used as the adhesive.
The spline sleeve 16 to which the rubber element 24 and the bush 26 are adhered is press fitted into the outer tube 19.

This propeller shaft is a frictional force between the rubber element 24 and the outer tube 19,
Rotate the spline sleeve 16 to the outer tube 19
Communicate to.

A seal 17 is interposed between the spline shaft 14 and the spline sleeve 16 in the vicinity of the end surface on the side of the spline yoke 13, and the seal 17 is fixed by a snap ring 18 so that dust or the like enters the space. It is prevented by the seal 17.

In this propeller shaft, the thickness and hardness of the rubber element 24 determine the torsional rigidity value. Therefore, the thickness of the rubber element 24 can be changed by changing the depth of the recessed surface 25, and the rubber element 24 having the hardness required to obtain the required rigidity value is adopted, so that the propeller shaft having the required rigidity value can be obtained. Can be

Therefore, it is necessary to prepare the spline sleeve 16 in which the depth of the recessed surface 25 is changed in plural kinds and the plural kinds of rubber elements 24 having different thicknesses and hardnesses corresponding to the spline sleeve 16 in advance so as to be arranged. A propeller shaft having a high torsional rigidity value can be obtained.

Further, since changing the depth of the recessed surface 25 does not affect other parts, it is possible to make a series of propeller shafts. Further, since the bush 26 having a thickness corresponding to, for example, 1 mm or less is inserted into the narrow gap between the spline sleeve 16 and the outer tube 19, the outer tube 1
The distance between 9 and the spline sleeve 16 does not deviate.

Therefore, the unbalance generated by welding or the like is not promoted by the centrifugal force associated with the high speed rotation, and the vibration is generated up to the high speed rotation range where the vibration is conventionally impossible. It can be rotated without.

[0037]

As described above, according to the present invention, the space between the outer tube and the spline sleeve is reduced to a narrow space, and the bush of the non-lubricated resin sheet material is interposed in this space, so that the unbalance is caused by the rotation of the propeller shaft. It is not encouraged.

Therefore, it is possible to increase the maximum permissible rotation speed to a high-speed rotation range which has been impossible due to vibration. Furthermore, for different torsional rigidity values required for propeller shafts, the depth of the recessed surface of the spline sleeve is changed, and rubber elements with different thicknesses corresponding to the depth of this recessed surface are prepared in advance. By doing
Propeller shafts having a plurality of required torsional rigidity values can be obtained.

Therefore, it is not necessary to change parts other than the spline sleeve and the rubber element for different torsional rigidity values, and it is possible to make a series of propeller shafts.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of the bus showing a use position of the propeller shaft.

FIG. 3 is a sectional view of a conventional propeller shaft.

[Explanation of symbols]

 13 Spline Yoke 14 Spline Shaft 15 Spline 16 Spline Sleeve 19 Outer Tube 22 Weld Yoke 24 Rubber Element 25 Recessed Surface 26 Bush

Claims (1)

[Claims] 1. A spline shaft is provided on a spline yoke, a spline sleeve is fitted to the spline shaft, an outer tube is fitted to the spline sleeve with a gap formed therebetween, and the outer tube is fixed to a weld yoke. In a propeller shaft having a rubber element interposed between the spline sleeve and the outer tube, the outer diameter of the spline sleeve and the inner diameter of the outer tube are formed to be narrow, and the outer surface of the spline sleeve has an outer tube. A recessed surface is formed in a portion other than both sides of the opposing surface to accommodate a rubber element, and a bush of a non-lubricated resin sheet material is interposed between the opposing surfaces not formed on the recessed surface. Propeller shaft characterized by