JPH01283436A - Universal joint - Google Patents

Abstract

PURPOSE:To improve the durability of a laminated spring through prevention of damage thereof by threadably attaching an anchoring axis to an input axis joint or to an output axis joint to join the anchoring axis and a hollow pin together, while joining the hollow pin and a plate spring together. CONSTITUTION:First, a plate spring 30 that is a component of a laminated spring 3 is polished on the edge of an anchoring hole 31. Then a hollow pin 40 is inserted into the anchoring hole 31 of the laminated spring 3. After a slightly larger punch P is pressure-fitted into a through hole of the hollow pin 40, the peripheral side of the hollow pin 40 is pressed to the edge of the anchoring hole 31. An anchoring axis 5 is then inlaid tight in the through hole, thereby the hollow pin 40 is fixed to an input axis joint 1 or to an output axis joint 2 with its both ends pressed. In this way, prevention of damage to the laminated spring 3 and thus to improve the durability thereof are possible.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a universal joint, particularly a leaf spring coupling type @ joint, which includes an input shaft connecting body connected to an input shaft and a laminated leaf spring as an intermediary body. The durability of the laminated leaf spring is improved by improving the connection structure between the output shaft connecting body connected to the output shaft and the laminated leaf spring.

[Prior art and its problems] As shown in Fig. 5, a leaf spring coupling type shaft joint has an input shaft connection body (1) connected to an input shaft (10) and an output shaft (20) connected to it. The output shaft connecting body (2), which is connected to Since it has sufficient rigidity in the rotational direction, the input shaft (10) and output shaft (20) intersect at a certain angle, similar to a so-called hook joint (universal seat joint). Torque is transmitted even when the engine is closed.

However, with this universal joint, the transmission torque is concentrated at the joint between the laminated leaf spring (3) and the input shaft connection body (1), and at the joint between the laminated leaf spring (3) and the output shaft connection body (2). This connection is susceptible to damage.

For example, the mounting hole (31) formed in the laminated leaf spring (3)
There is a fitting margin between the mounting pin (32) and the head (33) of the mounting pin (32) and the input shaft connection body (1) or the output shaft connection body ( In the case of the type in which the spring is fixed by the clamping force between the spring and the seat (2), when an external force is applied to the laminated leaf spring (3) in the direction of bending it, the slippage corresponding to the above-mentioned fitting margin is Laminated leaf spring (3)
This occurs between the leaf springs (30) constituting the laminate leaf spring (3), and the laminated leaf spring (3) is bent as shown in the same figure, and the rigidity of the laminated leaf spring (3) in the rotational direction is extremely small. Become something. In other words, the transmitted torque is significantly reduced. or,
If the torque transmission state continues in the above state, the leaf spring constituting the Ut cover spring 3) will be damaged.

Therefore, in order to solve this problem,
There is a proposal as disclosed in Publication No. 3659.

As shown in Fig. 7, this conventional type has a laminated plate spring (
3) leaf springs (30), (30) mutually through the mounting holes (3)
1) is caulked with a hollow pin (40) inserted through it, and using this hollow pin (40), attach the laminated leaf spring (3).
) and the input shaft connection body (1) or the output shaft connection body (2).

In this conventional type, the mounting hole (
3]), the hollow pin (40) is inserted into it and the plate spring (40) constituting the laminated plate spring (3) is fixed.
30) Mutual slippage is less likely to occur.

However, even with this conventional type, its durability is insufficient, and when used for a long period of time, play may occur between the mounting hole (31) of the leaf spring (30) and the hollow pin (40). , and further, the leaf spring (30) is inserted from the periphery of the mounting hole (31).
damage may occur.

This is because if the mounting hole (31) of the leaf spring (30) is formed by punching, a non-smooth fractured surface will occur around the periphery of the mounting hole (31). ) under the condition that the outer peripheral surface and the fractured surface are in contact with each other,
Input axis #! When the connecting body (1) and the output shaft connecting body (2) cross each other and torque is transmitted, a slight crack remaining on the fracture surface grows, and eventually this mounting hole (31)
This is because it will result in damage.

In order to prevent such inconvenience, it is conceivable to perform reaming to remove the non-smooth fractured surface at the periphery of the mounting hole (31) prior to caulking the hollow pin (40). In this case, although the above-mentioned inconvenience is resolved,
This laminating process becomes extremely troublesome.

In addition, even in the case of such a structure, a gap will be created between the outer periphery of the hollow pin (40) and the inner periphery of the mounting hole (3 holes), although it is small. This allows the laminated leaf spring (3) and the hollow pin (40) to move relative to each other by a distance corresponding to the distance, which causes a decrease in durability.

[Technical Problem] The present invention provides an r input shaft connection body (1) and an output shaft connection body (2).
are connected via a laminated leaf spring (3), and the structure of the joint portion of the laminated leaf spring (3), input shaft connection body (1), and output shaft connection body (2) is connected to the laminated leaf spring (3). Mounting holes formed in (
The hollow pin (40) is inserted into the shaft (31), and the fixing shaft (5) through which the hollow pin (40) is inserted is fixed to the input shaft connection body (11) or the output shaft connection body (2). In the shaft joint J, in order to improve the durability of the joint between the hollow pin (40) and the laminated leaf spring (3), a hollow pin is installed on the inner peripheral surface of the mounting hole (31) from which the uneven fractured surface has been removed. The technical problem is to bring the outer peripheral surfaces of (40) into close contact with each other.

Means C] The technical means of the present invention taken to solve the above technical problem is that the leaf spring (30
) is configured such that the end face of the mounting hole (31) is polished by a polishing method such as barrel polishing or shot blasting, and the hollow pin (40) is inserted into the mounting hole (31) of the laminated plate spring (3), and the hollow pin (40) is Pin (40) and laminated leaf spring (3
) into the through hole (41) of the hollow pin (40) by pressing a slightly larger punch (P) into the hollow pin (40).
The outer peripheral surface of the mounting hole (31) is pressed against the edge of the mounting hole (31),
The fixing shaft (5) is tightly fitted into the through hole (41),
The input shaft connection body (1) or the output shaft connection body (2
).

[Effect] The above technical means works as follows.

Leaf springs (30), (3) constituting the laminated leaf spring (3)
The inner peripheral edge of the mounting hole (31) of No. 0) is smoothed by polishing such as barrel polishing, and the peripheral edge of the mounting hole (31) does not have a non-smooth fractured surface unlike the conventional one. A hollow pin (40) is tightly fitted into this mounting hole (31), and the edge of the mounting hole (31) is bitten into the outer peripheral surface of this hollow pin (40). It's full.

In this way, the hollow pin (40) and the attachment hole (31) fit tightly together, with no gap present between them. That is, the laminated leaf spring (3) and the hollow pin (
40) is in a completely integrated state.

The fixing shaft (5) is tightly fitted into the through hole (41) of the hollow pin (40) in the above state, and the laminated leaf spring (3) is fixed to the input shaft connecting body (1) by this fixing shaft (5). ) and the output shaft connection body (2), so when the input shaft connection body (1) and the output shaft connection body (2) are connected via the laminated leaf spring (3), the lamination No slipping occurs at the connection between the leaf spring (3) and the input shaft connection body (1) or the output shaft connection body (2).

In addition, since the edges of the mounting hole (31) are wedged into the outer peripheral surface of the hollow pin (40), the edges of the mounting hole (31) do not move relative to each other, and the hollow pin ( 4
0), there is no relative movement.

[Effect] When the input shaft connection body (1) and the output shaft connection body (2) are connected via the laminated leaf spring (3), the laminated leaf spring (3) and the input shaft connection body (1) Or output shaft connection body (2)
Since there is no slippage at the connecting portion, it is possible to prevent a part of the leaf spring (30) constituting the laminated leaf spring (3) from bending, resulting in a decrease in durability and a reduction in transmitted torque.

Since the edges of the mounting hole (31) do not move relative to each other, nor do they move relative to each other in relation to the hollow pin (40), the crack progresses and expands from the edge of the mounting hole (31). Damage to the laminated leaf spring (3) caused by this can be prevented, and durability is improved in this respect as well.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

In the embodiment shown in FIGS. 1 to 4, a laminated leaf spring (3) is constructed by laminating ring-shaped leaf springs (30) of a constant width, and each leaf spring (30) has a Attachment holes (31) are formed at positions that divide the circumference into four equal parts.

This leaf spring (30) is manufactured by punching, but when each leaf spring (30) formed in this way is barrel-polished, the cross-sectional shape of the mounting hole (31) is The non-smooth surface of the fractured surface has been removed, resulting in a rounded cross-sectional shape.

Therefore, the fine cracks generated during the shearing step of the punching process by press working are removed by the barrel polishing.

When the laminated leaf springs (3) formed and finished as described above are stacked, the mounting holes (31) will match each other. Therefore, insert the hollow pin (40) into this mounting hole (31), and as shown in Fig.
40), the leaf springs (30) and (30) group are caulked together. In this caulked state, there is a slight gap around the outer periphery of the hollow pin (40), but this gap disappears when the punch (P) is press-fitted in the next step (step shown in Figure 3), and the hollow pin (40) The outer periphery of the pin (40) comes into close contact with the inner periphery of each mounting hole (31).

That is, a punch (P) with a diameter slightly larger than that of the through hole (41) is used, and the hollow pin (40) is made of a plastically workable material such as brass. . A laminated leaf spring (3) caulked with a hollow pin (40) made of such a material.
When the punch (P) is placed between the punch (P) and the die and the punch (P) is press-fitted into the through hole (41) as shown in Fig. 3, the diameter of the hollow pin (40) is expanded and the outer peripheral surface will bite into the mounting hole (31) i7J. As a result, the leaf spring (30) constituting the laminated leaf spring (3)
, (3(1) and the hollow pin (40) are reliably integrated.

In particular, as in this embodiment, when the hollow pin (40) expansion ratio by press-fitting the punch (P) is set large,
As shown in FIG. 1, a very small gap is created between the leaf springs (30) and (30) that make up the 44 laminated leaf springs (3). In this case, the attachment hole (31)
The end cross section of the hollow pin (40) is surrounded over a wide range by the surface of the hollow pin (40).

Hollow pins (40), (40
) equipped with fJ! As shown in the figure, the laminar spring (3) is fixed to the input shaft connection body (11) or the output shaft connection body (2) by inserting the fixing shaft (5) into the through hole (41). ,
In this embodiment, a pair of mounting holes (31), (31) located on opposite sides form a pair to form an input shaft connection body (1).
and the other pair of mounting holes (31), (31)
are fixed to the output shaft connection body (2) as a set. Thereby, the input shaft connection body (1) and the output shaft connection body (2) can be bent in directions perpendicular to each other (direction perpendicular to the surface of the laminated leaf spring (3)).

In particular, in this embodiment, the caulked portions (42), (42) at both ends of the hollow pin (40) have an arcuate portion formed on the inner periphery, and the tapered surface facing the arcuate portion is The mounting holes (
Insert the fixing shaft (5) so as to pinch the peripheral edge of the fixing shaft (5), and screw the threaded part of the fixing shaft (5) to the input shaft connection body (11) or the output shaft connection body (2). do.

Since the biting part (44) on the outer periphery of the hollow pin (40) protruding between the edges of the mounting holes (31) of the leaf springs (30) and (30) becomes thinner toward the tip,
The plate springs (30), (30) are fixed by the screws.
They tend to press against each other, which causes the hollow pin (
40) is reduced in diameter. Therefore, by screwing, the fixing shaft (5) is tightened by the peripheral edge of the through hole (41), and there is no gap between the through hole (41) and the fixing shaft (5).

In this way, in this embodiment, when the fixing shaft (5) is screwed into the input shaft connection body (1) or the output shaft connection body (2),
The fixing shaft (5) and the hollow pin (40) are connected in a state where there is no margin for eight shifts, and there is no margin for heart motion between the hollow pin (40) and the leaf springs (30), (30). Therefore, it is possible to completely prevent a relative shift at the joint portion between the laminated leaf spring (3), the input shaft connection body (1), and the output shaft connection body (2).

Note that the washers (43) and (43) attached to the input shaft connection body (+) or the output shaft connection body (2) are both formed on the input shaft connection body (1) or the output shaft connection body (2). A portion of the washer (43) is press-fitted into the mounting recess (C), which prevents the washer (43) from moving relative to the input shaft connection body (1) or the output shaft connection body (2). Ru.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, and Fig. 2 is a plate spring (30
), Figure 3 is an explanatory diagram of the process of press-fitting the punch into the hollow pin (40), Figure 4 is a perspective view of the laminated leaf spring (3),
5 to 7 are explanatory diagrams of conventional examples, and in the figures (1)...Input shaft connection body (2)...Output shaft connection body (3)...Laminated leaf spring (31 )...Mounting hole (40)...Hollow pin (5)...Fixing shaft (41)...Through hole

Claims (1)

[Claims] The input shaft connection body (1) and the output shaft connection body (2) are connected via a laminated plate spring (3), and the laminated plate spring (3), the input shaft connection body (1), and the output shaft connection body ( 2), the hollow pin (40) is inserted into the mounting hole (31) formed in the laminated plate spring (3), and the hollow pin (40) is
In a universal joint in which a fixing shaft (5) through which a fixing shaft (5) is inserted is fixed to an input shaft connecting body (1) or an output shaft connecting body (2), a leaf spring ( 30)
The end face of the mounting hole (31) is polished by a polishing method such as barrel polishing or shot blasting, and a hollow pin (40) is inserted into the mounting hole (31) of the laminated plate spring (3), and the hollow pin (40) and laminated leaf spring (3)
A slightly larger punch (P) is press-fitted into the through hole (41) of the hollow pin (40) to press the outer peripheral surface of the hollow pin (40) against the edge of the mounting hole (31). Then, the fixing shaft (5) is tightly fitted into the through hole (41), and the input shaft connection body (1) is assembled with both ends of the hollow pin (40) being compressed by the fixing shaft (5). Or output shaft connection body (2)
A universal joint designed to be fixed to.