JPH0647737U - Universal joint - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a universal joint that is compact, easy to assemble, and has zero end face clearance (end float amount) between the spider and the bearing. A universal joint for connecting a pair of yoke members 11 and 12 with a cross spider 10
The shaft portion 14 of the spider is separated from the central portion 13, knurled 17 is applied to the shaft portion base end, and a circular hole 15a into which the knurled shaft portion base end is press-fitted is formed in the outer end of the spider.
In a state where the bearing 18 is fitted to the tip of the separated shaft portion with zero end float amount, the bearing is connected to the connecting holes 11b, 1b of the yoke member.
Since the knurled base end of the shaft portion was press-fitted into the circular hole 15a in the central portion of the spider while being press-fitted into 2b,
Even if the two areas of the yoke are narrowed, the spider with the required shaft diameter can be easily assembled, the transmission capacity and size setting range of the universal joint can be widened, and the bearing can be assembled beforehand as a sub-assembly. The float amount can be set to zero and the state can be secured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a universal joint used for a transmission device of an automobile.

[0002]

[Prior art]

 For example, as is well known, the shaft end of a propeller shaft (propeller shaft) used between a transmission and a final reduction gear in a transmission of an automobile transmits rotation while allowing vertical movement of the propeller shaft. A universal joint is provided. The joint includes a pair of bifurcated yoke members provided at the ends of both shafts to be connected at right angles to each other, and a cross-shaped spider is inserted through a bearing into a connecting hole formed in the yoke member. Fixed ones are often used. However, as shown in FIG. 5, in the spider 1 which has been generally used in the past, the lengths of the respective shafts 1a and 1b intersecting at right angles are such that the axes of the two forked arms 2a and 2b of the yoke member 2 are axially centered. Since the length is such that it reaches the respective end portions of the connecting holes 3a, 3b opened together, the spider 1 can be assembled into the connecting holes 2a, 2b of the yoke member 2 as shown in FIG. Even if 1 is inserted while being tilted, the diameters of the connecting holes 2a and 2b, the intervals between the holes 2a and 2b, etc. must be made as large as necessary to incorporate the spider 1, and the dimension that is required from the viewpoint of transmission torque and strength. There was a drawback that it became larger than the above.

In order to improve this, there is a universal joint as disclosed, for example, in Japanese Utility Model Publication No. 55-163536 or Japanese Utility Model Publication No. 55-59817. The former has a pair of bifurcated sockets (Note: yoke members), each of which has a pin centered in the shaft and a pin insertion hole formed in the corresponding piece, and pin insertion holes on the corresponding four surfaces inside the bifurcated socket. It is composed of a box-shaped middle piece having a hole formed therein, and a pin for connecting the middle piece and the forked socket by inserting the middle piece and the pin insertion hole of the forked socket. In the latter, the tip of the bifurcated arm of the yoke member that supports the cross shaft is divided, and this is attached with bolts.

[0004]

[Problems to be solved by the device]

 However, the former of the above-mentioned Japanese Utility Model Publications has a complicated structure, requires a lot of time for assembly, and is uneasy in terms of strength, and the latter also divides the tip of the arm portion to which a large torque is applied. There is a problem of anxiety about strength. The present invention solves the above problems of the conventional universal joint, and provides a universal joint that is compact and easy to assemble the spider, and that has zero end face clearance (end float amount) between the spider and the bearing. It was devised for the purpose of doing.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the universal joint of the present invention is a universal joint in which a pair of yoke parts are connected by a cross-shaped spider, and the shaft part of the spider is separated from the central part, and a knurl is provided at the base end of the shaft part. A circular hole into which the knurled shaft base end is press-fitted is formed in the outer end of the center of the spider, and the bearing is fitted to the separated shaft end with zero end float. The bearing is press-fitted into the connecting hole of the yoke member, and the knurled base end of the shaft portion is press-fitted into the circular hole at the center of the spider to be joined.

[0006]

[Work]

 In the universal joint of the present invention having the above-mentioned structure, first, the bearing 18 is fitted to the tip 14b of the shaft portion 14, ... Of the split type cross-shaped spider 10, and the needle 19 thereof is fitted in contact with the peripheral surface of the tip 14b, At this time, the gap between the inner surface (ceiling surface or bottom surface) of the retainer 20 and the end surface of the shaft end 14b is set to zero. Next, with one of the yoke members 11 arranged such that the connecting holes 11b are arranged in the vertical direction, the axis of the short arm 15 that vertically faces the central portion 13 of the spider 10 is aligned with the axis of the connecting hole 11b. In this state, the sub-assembled shaft portion 14 with the bearing 18 is press-fitted from above and below the connecting hole 11b, and at the same time, the knurled base end 14a of the shaft portion 14 is attached. It is press-fitted into the circular hole (press-fitting hole) 15b of the central portion 13. Similarly, in a state where the connecting holes 12b formed in the arm portion 11a of the other yoke member 12 are aligned in the horizontal direction, the axis of the connecting hole 12b is aligned with the central portion 13 of the spider 10 in the horizontal direction. Aligning with the axis of the arm 15, in this state, the sub-assembled shaft portion 14 with the bearing 18 is pressed in from the left and right of the connecting hole 12b, and the shaft portion 14 is knurled 17. The base end 14a is press-fitted into the circular hole 15b in the central portion 13.

[0007]

【Example】

 1 to 3, 10 is a split type cross-shaped spider according to the present invention, 11 and 12 are yoke members, and connecting holes 11b and 12b formed in the bifurcated arm portions 11a and 12a through a bearing 18 described later. The cross spider 10 is connected. The split cross spider 10 is divided into a central portion 13 and a shaft portion 14. Short arms 15 are formed around the central portion 13 so as to be at right angles to each other, and a press-fitting hole 15a into which a base end 14a of the shaft 14 described later is press-fitted and a grease supply hole 15b are formed in each of the short arms 15. ing. The shaft portion 14 is subjected to knurling 17 around the flange 16 with the lower end as a base end 14a, and the shaft end 14b above the flange 16 is precision processed to fit the bearing 18. Has been done. Incidentally, 14c is a grease supply hole. The bearing 18 supports a needle 19 that contacts the periphery of the shaft portion 14b in a retainer 20, and the retainer 20 is inserted into a connecting hole 11a (12a) of the yoke member 11 (12) as described later. Pressed in. The retainer 20 has a groove 20a formed at the top thereof, and after the press-fitting, a restraining plate 21 is inserted into the groove 20a and fixed to the york member 11 (12) with a bolt 22 to prevent rotation and disengagement. . Reference numeral 23 in FIG. 4 is an application example of the central portion, which is obtained by excluding the short arm 15 of the central portion 13 and has press-fitting holes 23a formed at four places around the periphery.

The universal joint of the present invention having the above structure is assembled as follows. That is, first, a bearing 18 having a seal 24 at its open end is fitted to the tips 14b of the four shafts 14, ... Of the split cross spider 10 so that the needles 19 thereof are in contact with the peripheral surface of the tip 14b. At this time, the gap between the inner surface (ceiling surface or bottom surface) of the retainer 20 and the end surface of the shaft portion tip 14b is set to zero. Next, as shown in FIG. 2, in a state in which the connecting holes 11b formed in one arm 11a of one yoke member 11 are arranged in the vertical direction, the central part 13 of the spider 10 is opposed to the short arm in the vertical direction. The shaft with the bearing 18 is disposed so that the shaft center of 15 is on the axis of the connecting hole 11b, and in this state, as shown in FIG. 3, the sub assembly is formed from above and below the connecting hole 11b. The parts 14, ... Are press-fitted, and the knurled base end 14a of the shaft part 14 is press-fitted into the press-fitting hole 15b of the central part 13. Similarly, in a state where the connecting holes 12b formed in the arm portion 11a of the other yoke member 12 are aligned in the horizontal direction, the axis of the connecting hole 12b is aligned with the central portion 13 of the spider 10 in the horizontal direction. Aligning with the axis of the arm 15, in this state, the sub-assembled shaft portion 14 with the bearing 18 is pressed in from the left and right of the connecting hole 12b, and the shaft portion 14 is knurled 17. The base end 14a is press-fitted into the press-fitting hole 15b of the central portion 13. The press-fitting is performed until the bottom surface of the recessed groove 20a formed in the retainer 20 is flush with the end surface of the arm portion 11a or 12a of the yoke member 11 or 12. A retainer plate 21 is inserted into the recessed groove 20a of the retainer 20 thus press-fitted, and its end is fixed to the end faces of the arm portions 11a and 12a of the yokes 11 and 12 with a small bolt 22.

[0009]

[Effect of device]

 The universal joint of the present invention is a universal joint in which a pair of yoke members are connected by a cross-shaped spider. In the universal joint, the shaft portion of the spider is separated from the central portion, and the basal end of the shaft portion is knurled, and the outer portion of the spider central portion is separated. A circular hole is formed at the end into which the base end of the knurled shaft is press-fitted, and the bearing is press-fitted into the connecting hole of the yoke member with the bearing fitted at the end of the separated shaft with zero end float. At the same time, since the knurled base end of the shaft portion is press-fitted into the circular hole in the central portion of the spider to be joined, the following effects can be obtained. That is, (1) By separating at least two adjacent shaft parts of the spider from the central part, even if the width across flats of the yoke is narrowed, a spider having a shaft diameter necessary for the universal joint can be easily assembled. As a result, the setting range of the transmission capacity and size of the universal joint can be widened, and the range of application of the universal joint can be expanded. (2) Bearings can be assembled in advance on the shaft of the spider as a sub-assembly, which makes it possible to reduce the amount of end float to zero. (3) The shaft part and the central part are connected by the knurled shaft end and the circular hole into which the base end is press-fitted.Therefore, when configured as a universal joint, the end float amount is zero. It is possible to make a universal joint that is superior in strength to the conventional assembly type while securely maintaining. (4) Since the spider is separated into the shaft part and the center part, it is not necessary to manufacture the spider by forging, the shaft part can be manufactured from a round bar, and the center part can be manufactured from a block material, which can reduce the cost of rough materials. .

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of the universal joint of the present invention.

FIG. 2 is an exploded perspective view of the universal joint of the present invention.

FIG. 3 is a view showing an assembled state of the universal joint of the present invention to a yoke.

FIG. 4 is a perspective view of a modification of the central portion of the universal joint of the present invention.

FIG. 5 is a state diagram of assembling a spider to a yoke in a conventional universal joint. 10: split type cross-shaped spiders 11, 12; yoke members 11a, 12a; arm portions 11b, 12b; connecting hole 13; center portion of spider 14 Coaxial part 14a; Shaft part base end 14b; Shaft part tip 15; Central part short arm 15a; Press-fit hole (circular hole) 17; Knurl processing 18; Bearing 19; Needle 20; Retainer 21;

Claims (1)

[Scope of utility model registration request] 1. A universal joint in which a pair of yoke members are connected by a cross-shaped spider, wherein a shaft portion of the spider is separated from a central portion, and a knurling is applied to a proximal end of the shaft portion so that an outer end of the spider central portion Is formed with a circular hole into which the knurled shaft end is press-fitted, and the bearing is fitted into the connecting hole of the yoke member while the bearing is fitted to the separated shaft end with zero end float amount. A universal joint characterized in that a knurled base end of the shaft portion is press-fitted into a circular hole in the central portion of the spider to be joined.