JPH0594555U - Propeller shaft - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a propeller shaft having a small number of parts, by providing balance pieces at both ends in the longitudinal direction of the propeller shaft to allow unbalance correction, and without the need to provide a balance weight on the yoke portion. A propeller shaft including an iron propeller shaft main body 22 having a yoke portion 25 at one end and a cast yoke sleeve 23 having a yoke portion 28 at one end, wherein the propeller shaft main body 22 and the yoke sleeve are provided. The balance pieces 35 and 36 having a curved shape along the outer peripheral surface are fixed to the outer peripheral surface located near the yoke portions 25 and 28 of 23 by projection welding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a propeller shaft that transmits rotational torque from a vehicle transmission to a rear axle.

[0002]

[Prior Art]

 In propeller shafts that transmit the rotational torque from the transmission to the rear axle, the propeller shaft for trucks consists of the open drive hollow shaft type shown in Fig. 5 (a) and the solid shaft type shown in Fig. 5 (b). Two types are used.

The open drive hollow shaft type is composed of an iron propeller shaft body 2 made of a pipe having a yoke portion 1 at one end, and a cast yoke sleeve 4 having a yoke portion 3 at one end, The other ends of the propeller shaft body 2 and the yoke sleeve 4 are spline-coupled to each other.

The solid shaft type is composed of an iron propeller shaft body 7 composed of a shaft 6 having a yoke portion 5 at one end, and a cast yoke sleeve 9 having a yoke portion 8 at one end, The other ends of the propeller shaft body 7 and the yoke sleeve 9 are spline-coupled to each other.

The propeller shaft has three functions: transmission of rotational torque, absorption of positional fluctuations from the transmission to the rear axle, and interruption of rotational vibration (when there is an intermediate bearing).

Further, a propeller shaft for a truck is composed of a large number (about 50) of parts, but there are variations in the parts accuracy of these parts, single-sided material, etc. In most cases, an imbalance occurs. Therefore, in order for the propeller shaft rotating at high speed to sufficiently satisfy the above three points, the correction of the unbalance amount of the propeller shaft is an important issue.

Conventional unbalance correction uses an unbalance measuring machine and a balance piece or balance weight in the final process of the assembly line. However, regardless of the hollow shaft type or solid shaft type, the propeller shaft main body 2 A polar coordinate correction method of projection welding the balance piece 10 to the portions located near both ends of the is adopted.

Further, as shown in FIG. 6, the balance weight 13 is fixed to the bearing retainer 12 provided on the spider 11 of the yoke portions 3 and 8 of the yoke sleeves 4 and 9 by the bolt 14 to correct the 90-degree component force. Method is used.

[0009]

[Problems to be solved by the device]

 By the way, it is most desirable to fix the balance pieces to both ends of the propeller shaft in the longitudinal direction in order to correct the imbalance of the propeller shaft, but the propeller shaft is made of iron propeller shaft body and cast (FCD material). Since it consists of a yoke sleeve, even if the balance piece can be welded to the propeller shaft body, the yoke sleeve is made of cast metal and cannot be welded.

Therefore, it is unavoidable to adopt a 90-degree component force correcting method in which the balance weight is fixed to the yoke portion of the yoke sleeve with a bolt. As a result, the number of parts such as balance weights, lock plates, and bolts is large, which is a cause of cost increase.

This invention has been made in view of the above circumstances, and its purpose is to make it possible to easily correct the imbalance of the propeller shaft, reduce the number of parts, and reduce the cost. It is to provide a propeller shaft capable of

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises an iron propeller shaft main body having a yoke portion at one end and a cast yoke sleeve having a yoke portion at one end, and the propeller shaft main body and the yoke are provided. In a propeller shaft in which the other ends of the sleeve and the sleeve are fitted and joined together, a balance piece curved along the outer peripheral surface is projection-welded to the outer peripheral surface of the propeller shaft main body and the yoke sleeve located near the yoke portion. Fixed by.

[0013]

[Action]

 A balance piece is joined to the propeller shaft body and the outer peripheral surface of the yoke sleeve located near the yoke part. One of the electrodes for projection welding is brought into contact with the balance piece, and the other is attached to the balance piece. Abutting on the sleeve, a welding current is applied while applying pressure, and the balance piece is projection welded to the propeller shaft body and yoke sleeve.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a hollow shaft type propeller shaft 21, 22 is a propeller shaft main body, and 23 is a yoke sleeve. The main body of the propeller shaft main body 22 is formed of an iron pipe 24. A yoke portion 25 is connected to one end of the pipe 24, and a shaft portion 27 having a spline 26 is provided at the other end. ing.

The yoke sleeve 23 has a cylindrical shape, and a yoke portion 28 is coupled to one end of the yoke sleeve 23, and a fitting portion 29 that is fitted to the shaft portion 27 of the propeller shaft main body 22 is provided at the other end portion. Further, a spline 30 that engages with the spline 26 is provided on the inner peripheral surface of the fitting portion 29.

Therefore, the propeller shaft main body 22 and the yoke sleeve 23 rotate integrally. The yoke portions 25 and 28 have basically the same structure, and as shown in FIG. 2, a fitting hole 31 is provided, and a spider 32 is inserted into the fitting hole 31.

A needle bearing 33 is fitted to the spider 32, and the needle bear ring 33 is held by a snap ring 34 engaged with a groove of the fitting hole 31.

A first balance piece 35 is provided on the end portion of the propeller shaft main body 22 of the propeller shaft 21 thus configured, that is, on the outer peripheral surface of the pipe 24 located in the vicinity of the yoke portion 25 by means described later. It is projection welded. Further, a second balance piece 36 is projection-welded to the end portion of the yoke sleeve 23, that is, the outer peripheral surface located in the vicinity of the yoke portion 28 by means to be described later.

The first and second balance pieces 35 and 36 have the same shape. As shown in FIG. 3, a rectangular steel plate is curved along the outer peripheral surfaces of the propeller shaft body 22 and the yoke sleeve 23. The curved plate 37 is provided with two truncated cone-shaped projections 38 (cone type) which are press-formed in an arc shape.

Then, as shown in FIG. 4, when welding the second balance piece 36 to the yoke sleeve 23, the projection 38 is set so as to abut on the outer peripheral surface of the yoke sleeve 23, and the projection welding is performed. When one of the electrodes 39 of the above is brought into contact with the second balance piece 36 and the other electrode 40 is brought into contact with the yoke sleeve 23 corresponding to the second balance piece 36, a welding current is applied while applying a pressing force, Since the welding current and the electrode pressure are concentrated on the protrusion 38 and the current density is increased, an ideal nugget is formed on the joint surface, and the second balance piece 36 is projection welded to the cast yoke sleeve 23. It The same applies when the first balance piece 36 is projection welded to the propeller shaft body 22.

It should be noted that the cone type protrusions 38 provided on the first and second balance pieces 35, 36 do not cause excessive depression on the mating side when the propeller shaft body 22 and the yoke sleeve 23 are pressed with a high pressure. It has a shape and is effective in preventing the generation of dust due to extremely high current density due to the use of large current.

[0023]

[Effect of the device]

 As explained above, according to the present invention, the balance piece having a curved shape along the outer peripheral surface of the propeller shaft main body and the yoke sleeve in the vicinity of the yoke portion is projection-welded. The balance piece can be fixed to the cast yoke sleeve that was previously possible.

Therefore, the balance pieces can be provided at both ends in the longitudinal direction of the propeller shaft to correct the unbalance, the balance weight need not be provided at the yoke portion, the number of parts can be reduced, and the number of assembling steps can be reduced to reduce the cost. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a propeller shaft according to an embodiment of the present invention is cut away.

FIG. 2 is a partially cutaway side view showing an enlarged part A of FIG.

3A and 3B show a balance piece of the embodiment, FIG. 3A is a perspective view, and FIG. 3B is a sectional view taken along line BB in FIG. 3A.

FIG. 4 is a side view showing a state of projection welding according to the same embodiment.

5A and 5B show a conventional propeller shaft, in which FIG. 5A is a partially cutaway side view of a hollow shaft type, and FIG. 5B is a partially cutaway side view of a solid shaft type.

FIG. 6 is a partially cutaway side view showing a portion C of FIG. 5 in an enlarged manner.

[Explanation of symbols]

21 ... Propeller shaft, 22 ... Propeller shaft body, 23 ... Yoke sleeve, 25, 28 ... Yoke part, 3
5 ... 1st balance piece, 36 ... 2nd balance piece.

Claims (1)

[Scope of utility model registration request] 1. An iron propeller shaft body having a yoke portion at one end and a cast yoke sleeve having a yoke portion at one end, wherein the other end portions of the propeller shaft body and the yoke sleeve are mutually connected. In the propeller shaft that is fitted and coupled with each other, the balance piece having a curved shape along the outer peripheral surface is fixed to the outer peripheral surface located near the yoke portion of the propeller shaft main body and the yoke sleeve by projection welding. Propeller shaft to do.