JPS6216501Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a universal joint used in a power transmission shaft, such as a propeller shaft.

(Prior Art) Conventional universal joints of this type having a cross shaft are classified into the following three types in structure.

(1) Integrated yoke type (2) Block type (3) Flange type First, (1) Integrated yoke type is as shown in Figure 1a.
The round bearing 2 is inserted into the polished housing of the yoke 1, and the yoke has no divided parts, so the yoke itself has the advantage of being relatively strong and having a small number of parts. However, since the cross shaft is fitted into the bearing part of the yoke, it is very difficult to assemble and disassemble, and due to the structure, the distance between the centers of the paired bearings is
The so-called swing diameter is limited, and the diameter of the shaft portion of the cross shaft cannot be increased beyond a certain value, so a large rotational force bearing capacity cannot be expected.

(2) As shown in Figure 1b, the block type is a type in which the bearing block 3 is tightened and fixed to the yoke body with bolts 4, and a cross shaft with a small swing diameter and a large shaft diameter is incorporated. be able to. However, the mechanical strength of the bolts 4 that fasten the bearing block to the yoke body
The problem is that it is limited by.

(3) In the flange type, as shown in FIG. 1c, the round bearing 2 is held down by a cap 6 that is separated from the yoke body 5, and is tightened and fixed with bolts 4. This structure is easy to assemble and disassemble, and therefore has a degree of design freedom in which the shaft diameter of the cross shaft can be arbitrarily selected.However, like the block type, the strength based on the bolt 4 is In addition to the above problems, the number of parts is also large.

FIG. 2 shows an example of a yoke portion of a flange type universal joint, in which a bearing is sandwiched between a yoke body 5 and a cap 6, and is tightened and fixed with bolts 4.

As mentioned above, each type has its own advantages and disadvantages, but ideally it is an integral yoke type, consists of a cross shaft with a large shaft diameter, and has high mechanical strength and rotational force bearing capacity. It turns out that. However, in reality, when a universal joint is larger than a certain size (for example, the swing diameter is 400 mm or more), it becomes difficult to assemble and disassemble the integral yoke type, and special equipment is required for the work. come to need it. Therefore, a block type or flange type that is easy to assemble and disassemble is required.

(Purpose of the invention) The present invention is an analytical type that incorporates the advantages of the integral yoke type and the flange type, and is easy to assemble and disassemble even if the swing diameter is large. The present invention provides a universal joint whose diameter can be increased to increase rotational force bearing capacity.
Examples will be described below with reference to the drawings.

(Example) FIGS. 3 and 4 show an example of the present invention. 11 is a bifurcated yoke, 12 is a cross shaft, 12a and 12b are shaft portions, and 13a and 13b are bearings having needle-shaped rollers or rod-shaped rollers 14.
One of the two holding parts 11 of the yoke 11 that holds the bearings 13a and 13b of the cross shaft 12
a has an integral structure with the yoke body. The other holding portion 11b has a structure in which the cap 15 is separated from the yoke body. The separation surface is provided with keys or serrations. Note that 16 is a presser plate, and 17 is a counterpart yoke.

Next, when assembling the universal joint, proceed in the following order.

(a) First, one bearing holding portion 11a of the yoke 11
(b) Insert the bearing 13a into the bearing 13a, insert one shaft portion 12a of the cross shaft 12 into the bearing 13a, and (b) insert the bearing 13b into the other shaft portion 12b of the cross shaft 12.
(c) Place the cap 15 on the bearing 13b and tighten the cap 15 to the yoke body with the bolts 4. Fixing, (d) Attaching the presser plate 16, and (e) Attaching to the other yoke 17 in the same order.

According to the above assembly order and the reverse disassembly order, assembly and disassembly are extremely easy even when the swing diameter is large and the diameter of the cross shaft portion is large.

Generally, the rotational force bearing capacity of a universal joint is expressed by the following equation.

T = 2RP However, T: rotational force, P: external force (the maximum value of P is limited by the capacity of the bearing) R: radius of action of external force (2R is the swing diameter) Here, at least each of the cross axes When looking at the shaft of
Further, the radius of action of the external force is symmetrical with respect to the center. This is because the universal joint is one of the shaft components that transmits power through rotation, and it is necessary to balance the weight in order to ensure smooth rotation. Regarding this point, particular attention should be paid to the universal joint of the present invention in which the bearing holding portion is asymmetrical. However, adjustment is sufficiently possible by the conventional method of adding or reducing weight in necessary parts for weight balance, and there is no problem.

(Effect of the invention) As explained above, according to the invention, assembly,
It has the advantage of the conventional flange type in that it is easy to disassemble, and since there are fewer separation points compared to the flange type, it can have mechanical strength close to that of the integral yoke type. In addition, the swing diameter and cross shaft diameter can be arbitrarily selected and designed.
For example, by setting the cross shaft diameter/swing diameter to 0.24 or more, the rotational force bearing capacity can be increased compared to conventional products. Even though the bearing holding part in the yoke is asymmetrical, weight-balanced rotational performance and substantially equal rigidity of the bearing holding part (external force vs. deflection of the bearing holding part) can be achieved.

[Brief explanation of the drawing]

Figure 1 is a diagram showing various structures of conventional universal joints, where a is an integral yoke type, b is a block type, and c is a flange type. Figure 2 is a perspective view of the yoke part of a flange type universal joint. FIG. 3 is a perspective view of the yoke portion of an embodiment of the present invention, and FIG. 4 is a configuration diagram of the same universal joint. 11, 17...Yoke, 11a, 11b...Bearing holding part, 12...Cross shaft, 12a, 12b...
Shaft portion of cross shaft, 13a, 13b...Bearing, 15...
...cap.

Claims (1)

[Scope of utility model registration request] In a universal joint having a cross shaft, one of the two holding parts of the bifurcated yoke that holds the bearing part of the cross shaft is integrally constructed with the yoke body, and the other has a bearing holding cap extending from the yoke body. A universal joint characterized by consisting of separate structures.