JP3755983B2 - Universal shaft coupling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a universal shaft joint, and more particularly, to a universal shaft joint characterized by the attachment between a joint main body and a leaf spring intermediate.
[0002]
[Prior art]
FIG. 7 is an exploded perspective view of a conventional universal shaft joint.
The universal shaft joint includes a first joint main body (1a) connected to the first shaft (3), a second joint main body (1b) connected to the second shaft (7), and a first joint main body. (1a) and an intermediate body (2) made of an annular leaf spring partially attached to each of the second joint main body (1b).
[0003]
Both the first joint main body (1a) and the second joint main body (1b) have the same configuration, and include a flange portion (12) protruding from one end of the cylindrical main body portion (11). The first shaft (3) or the second shaft (7) is fastened to the portion (11) in a torque transmitting state. The first joint main body (1a) and the second joint main body (1b) are attached to the first shaft (3) and the second shaft (7) so that the flange portion (12) and the flange portion (12) face each other. However, an intermediate body (2) made of a laminated leaf spring is interposed between the facing flange portions (12) and (12).
[0004]
The outline of the intermediate body (2) is an annular body formed in an approximately octagonal shape, and one arc side portion (21) and the arc side portion (21) located on opposite sides of each other are the first joint main body (1a ) Are screwed to the flange portion (12), and the other arc sides (22) and (22) are screwed to the flange portion (12) of the second joint main body (1b).
In this screwing structure, a washer (13) is interposed between the planar end faces of the first joint main body (1a) and the second joint main body (1b) and the intermediate body (2), and the intermediate body (2) A cylindrical nut-shaped fixing pin (4) having a flat head (41) on the side is moved from the intermediate body (2) to the flange (12) side through the first shaft (3). The fastening bolt (40) inserted through the fixing pin (4) from the outside of the flange portion (12) is screwed into the fixing pin (4) and tightened.
[0005]
In this structure, the intermediate body (2) is alternately attached to the first joint main body (1a) and the second joint main body (1b) at a position where the periphery thereof is divided into four equal parts as shown in FIG. Moreover, each mounting portion serves as a screwing portion through which the pair of fixing pins (4) and (4) are inserted. Therefore, the intermediate body (2) includes a screwing portion on the first joint main body (1a) side that is symmetrical to each other and a screwing portion on the second joint main body (1b) side that is symmetrical to each other. Since it has a phase shift of 90 degrees, it functions smoothly as a universal shaft joint, and each screwing portion is in a mode through which a pair of fixing pins (4) (4) penetrates, The first joint main body (1a) and the second joint main body (1b) are fixed at two adjacent positions, and the deformation force applied to the intermediate body (2) during torque transmission (for example, the first shaft ( 3) and the second shaft (7), the resistance force against the deformation force generated when an excessively large torque is applied in an impact is sufficient.
[0006]
The magnitude of the resistance is proportional to the pitch of the pair of fixing pins (4) and (4) of each screwing portion, but conversely, the first axis (3) and the second axis. From the viewpoint of torque transmission efficiency when the shaft (7) is in an intersecting state, the pitch of the attachment portion of the intermediate body (2) to the first joint main body (1a) and the second joint main body (1b) It is advantageous that the value is small. This is because the flexibility of bending of the intermediate body (2) during torque transmission is increased.
[0007]
However, in this conventional one, each of the fixing pins (4) (4) is a donut-shaped washer (13) interposed between the end face of the flat flange portion (12) and the intermediate body (2). In order to secure a sufficient pressure receiving area of the washer (13) and satisfy the holding function of the washer (13), the donut-shaped washer (13) is enlarged to some extent. It is necessary to make the interval between the fixing pins (4) and (4) too small. For this reason, there was a problem that the torque transmission efficiency could not be sufficiently increased among the above performances in the intermediate (2).
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of such a point, and “the first joint main body connected to the first shaft, the second joint main body connected to the second shaft, the first joint main body, In the “universal shaft joint comprising an annular intermediate body made of a laminated leaf spring attached to each of the second joint main bodies”, when the excessive torque is applied between the two transmission shafts, etc. It is an object of the present invention to improve the transmission efficiency during transmission when the intermediate body has sufficient deformation resistance and the two transmission axes are in an intersecting state.
[0009]
[Means for Solving the Problems]
The solution of the present invention taken in order to solve the above-mentioned problem is as follows: "The intermediate body is partially attached to the first joint main body using a pair of fixing pins, and a part of the peripheral position of the intermediate body is attached to the intermediate body. Another part of the symmetric position of the periphery is attached to the second joint main body using a pair of fixing pins, and the intermediate body is the part of the first joint main body and the second joint main body. The contact portion is a raised portion having a hole portion into which a part of the pair of fixing pins is inserted, and the fixing pin inserted through the intermediate body into the raised portion is the first portion. It is fixed to the joint main body or the second joint main body. The above solution works as follows.
[0010]
The fixing pin has its head in contact with one surface of the intermediate body, and its shaft portion is inserted into the raised portion that contacts the other surface through the hole of the intermediate body. It is fixed to one joint main body or the second joint main body. Thus, the intermediate body is partially clamped by the head and the raised portion, and two fixing pins are juxtaposed and inserted into the raised portion. Since the raised portion inserts the two fixing pins simultaneously, the interval between the fixing pins is set to a minimum.
[0011]
As described above, the intermediate body and the first joint main body or the second joint main body and the fixing portion are configured to insert these two at the same time by a pair of (two) fixing pins. Since the intermediate body is configured to be pressed against one raised portion by the fixing pin, the contact portion between the raised portion and the intermediate body is set to a minimum, and is fixed at two locations. .
[0012]
【The invention's effect】
Since the present invention has the above configuration, the present invention has the following specific effects.
Since the contact portion between the raised portion and the intermediate body is set to a minimum and is fixed at two locations, a certain degree of flexibility in bending of the fixed portion of the intermediate body is ensured and the strength against impact load Will also be sufficient. Therefore, the torque transmission efficiency is high, and damage to the intermediate body can be prevented when excessive torque is applied impactively.
[0013]
[Others]
Item a in the above invention “The raised portion is configured separately from the first joint main body or the second joint main body and includes a pair of through holes through which the fixing pins are inserted , and the first joint main body Or, it is configured to be attached to the planar end face of the second joint main body ”, and a raised portion having two through holes with a predetermined thickness is attached to the attachment portion of the intermediate body of each joint main body. By simply doing so, it is attached in a state where a predetermined gap is formed between the end face of each joint main body and the intermediate body.
Therefore, the configuration of the first joint main body or the second joint main body can be simplified as compared with the case where the raised portion is formed integrally with the first joint main body or the second joint main body.
[0014]
In the item b or higher, “the intermediate body is formed by laminating a plurality of leaf springs, and the leaf springs are spot welded at attachment portions receiving pressure from the raised portions”, the laminated leaf springs of the attachment portions Since the mutual does not shift in the direction along the plane of lamination, the strength of the attachment portion of the intermediate body is further improved when an excessive torque is applied impactively.
[0015]
It is desirable that “the spot welded portion is set in the middle of the insertion portion of the pair of fixing pins”. In this case, there is an effect that does not affect the degree of freedom of bending of the intermediate body when two fixing pins are used while the effect of the spot welded portion is secured.
c. “The fixing pin is a cylindrical nut having a head at one end, and the head is applied to one surface of the intermediate body, and the cylindrical nut portion is closely passed through the hole of the intermediate body. The first joint main body and the second joint main body are formed into the flange portions opposite to each other, and the fastening bolts penetrating the flange portions are the cylindrical nuts. In the case of being screwed into the first joint main body and the second joint main body by bolting from the outside of the flange portions of the first joint main body and the second joint main body, Since it is fixed in the press-fitted state, it is easy to assemble a universal joint that secures the above-described effects of the present invention.
[0016]
Item d In the item a, “a concave portion is provided between the through holes on the outer peripheral side of the intermediate body in the raised portion , and the fixing pin is a cylindrical nut having a head at one end. And the cylindrical nut portion is tightly inserted into the hole of the intermediate body and is closely pressed into the through hole of the raised portion , and the intermediate body is laminated with a plurality of leaf springs. configured Te, said those "is spot welded at a range surrounded by the recess in the ridge, the fixing pin is tightly through the hole of the intermediate of the intermediate Sowase ridges When press-fitted into the through holes, the plurality of leaf springs are stacked in a precisely positioned state, and a required portion can be spot-welded in the recessed portion of the raised portion while maintaining the accurate stacked state.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the universal shaft joint according to the first embodiment, the first shaft (3) is used as the first joint body (1a) and the second shaft (7) is used as the second joint body (1b) as in the conventional example. Are connected to each other. In this example, for this shaft connection, an annular recess (14) is formed on the inner peripheral side of the flange portion (12) at one end of the cylindrical main body (11), and the inner peripheral wall of the annular recess is a cylinder. Part (15). Both the inner and outer peripheral walls of the annular recess (14) are tapered surfaces whose diameter decreases as they enter the back. Accordingly, the cylindrical portion (15) is a tapered cylindrical portion.
[0018]
A side ring (5) finished with a tapered surface whose inner and outer peripheral surfaces coincide with the tapered surface is inserted into the annular recess (14), and a fastening bolt (51) that penetrates the cylindrical main body (11) ( 51) is screwed into the side ring (5). As a result of these tightening, the side ring (5) is pushed into the annular recess (14) and the inner cylindrical portion (15) is tightened in the direction of diameter reduction. The cylindrical main body portion (11) and the second shaft (7) of one joint main body (1a) and the cylindrical main body portion (11) of the second joint main body (1b) are fixed by friction engagement.
[0019]
The intermediate body (2) is formed by laminating leaf springs. As shown in FIGS. 2 and 5, the entire intermediate body (2) is formed in an annular shape, a circular hole is opened in the center, and the outer periphery has a square corner portion (an arc corner portion ( 2a) and (2b). Therefore, the whole is formed in an irregular octagon. The arcuate corner portions (2a) and (2b) are formed with a pair of through holes (23) and (23), and a plate spring in which the middle of these through holes (23) and (23) is laminated by spot welding. Each other is locally coupled.
[0020]
On the diameter line of the end surface of the flange portion (12), the intermediate body (2) is assembled with the washers (42) (42) attached thereto. As shown in FIG. 3, the washer (42) is a plate body having an arcuate saddle-like planar shape (a shape corresponding to the arcuate corners (2a) (2b)) and two through holes (43). (43) is formed through. A recess (44) is formed in the middle of the outer side of the washer (42) located on the outer peripheral side of the intermediate body (2).
[0021]
The intermediate body (2) is temporarily assembled using a washer (42) and a fixing pin (4) and spot-welded as described above. This fixing pin (4) is shown in FIG. In addition, in the cylindrical nut whose one end is a flat head (41), the cylindrical portion of the fixing pin (4) and the through hole (23) and the through hole (43) are closely fitted, that is, The cylinder portion is set in a press-fit relationship, and is closely fitted to the seat portion of the seated hole (16) at a predetermined fitting intersection.
[0022]
At the time of the spot welding, in this example, according to the assembly of the first joint main body (1a) and the second joint main body (1b), as shown in FIG. 23) Press-fit the fixing pins (4) (4) into (23), and press-fit the tip of the cylindrical nut of each fixing pin (4) into the through holes (43) (43) of the washer (42). Then, the leaf springs of the required portion in the range surrounded by the recess (44) are spot welded. Thus, spot welds (24) and (24) are formed at four locations on the periphery of the intermediate body (2), and the intermediate body (2) in the temporarily assembled state is completed. In the portion of the flange portion (12) to which the washer (42) of the intermediate assembly (2) in the temporarily assembled state is attached, a seated hole (16) (with a pitch matching the through holes (43) (43)). 16) is formed through, and the intermediate body (2) is screwed using this.
[0023]
The positions of the through holes (43) and (43) of the first joint main body (1a) and the second joint main body (1b) are 90 degrees apart from each other, and the shape shown by the two-dot chain line in FIG. Of the four arc-shaped corner portions (2a) and (2b) of the intermediate body (2), a pair of arc-shaped corner portions (2a) and (2a) located opposite to each other is the first joint main first joint The other pair of arcuate corner portions (2b) (2b) is attached to the main body (1a), and is fixed to the second joint main body (1b).
[0024]
Note that a notch recess (17) is formed on the end face of the second joint main body (1b) on the side opposite to the attachment portion of the intermediate body (2) in one first joint main body (1a).
The universal joint having the above configuration is assembled as shown in FIG. 1, but since the intermediate body (2) is in a temporarily assembled state as described above, the arc-shaped corner portions at symmetrical positions in the intermediate body (2). (2a) The fixing pins (4) (4) of (2a) and the seated holes (16) (16) of the first joint main body (1a) are aligned, and the other arcuate corner (2b) (2b ) Fixing pins (4) and (4) are arranged so that the intermediate body (2) is aligned with the seated holes (16) and (16) of the second joint main body (1b), and the first joint main body (1a), A washer (42) is interposed between the flange portion (12) of the second joint main body (1b), and a fastening bolt (40) is screwed from the outside of the flange portion (12) to each fixing pin (4). The intermediate body (2), the first joint main body (1a), and the second joint main body (1b) are assembled together. In this assembled state, the pair of arc-shaped corner portions (2a) (2a) in the intermediate body (2) are screwed to the flange portion (12) of the first joint main body (1a). The arcuate corner portions (2a) and (2a) are screwed to the flange portion (12) of the second joint main body (1b).
[0025]
As a result, the screwed portions are provided at intervals of 90 degrees in the circumferential direction, and the intermediate body (2) is in the first direction perpendicular to the line connecting the pair of arcuate corner portions (2a) (2a). And bendable in a second direction perpendicular to the line connecting the pair of arcuate corner portions (2a) (2a), thereby forming a universal joint mechanism. In addition, since the surface of the flange part (12) facing the flat heads (41) and (41) during the bending in the two directions is a notch recess (17), the first joint main body (1a), Even if the distance between the flange portions (12) and (12) of the second joint main body (1b) is small, the degree of freedom of bending in the two directions can be sufficiently obtained.
[0026]
In this case, since a pair of through holes (43) and (43) is formed in one washer (42), the interval between the through holes (43) and (43) is different from the conventional one. It can be set smaller than those equipped with individual washers (13). In addition, since the entire surface of one washer (42) serves as a pressing surface of the intermediate body (2), the intermediate body (2) is sufficiently subjected to the clamping pressure by the pair of fixing pins (4) and (4). Further, as shown in FIG. 5, there is a spot weld portion (24) between the pair of through holes (23) and (23) arranged in the circumferential direction in the intermediate body (2). The laminated leaf springs are partially coupled to each other, and the displacement between the leaf springs can be prevented while ensuring the flexibility of bending of the intermediate body (2). In addition, since it is within the range of the pinched area by the pair of fixing pins (4) (4), there is no inconvenience due to the provision of the spot welds (24), (24).
[0027]
In the above embodiment, the raised portion is formed by using the washer (42). However, the raised portion may be formed directly on the end surface of the flange portion (12).
[Brief description of the drawings]
FIG. 1 is a sectional view of an embodiment of the present invention. FIG. 2 is a sectional view taken along line XX. FIG. 3 is a perspective view of a washer (42). ] Cutaway perspective view of intermediate body (2) [FIG. 6] Front view of intermediate body (2) in a temporarily assembled state [FIG. 7] Cross-sectional view of conventional example [FIG. 8] YY cross-sectional view [Explanation of symbols]
(12): Flange, (16): Seated hole, (2): Intermediate, (24): Spot weld
(42): Washer, (40): Clamping bolt (In the drawings, the same reference numerals indicate the same or corresponding parts.)

Claims (5)

  From a first joint body connected to the first shaft, a second joint body connected to the second shaft, and a laminated leaf spring attached to each of the first joint body and the second joint body In the universal shaft joint comprising the annular intermediate body, the intermediate body is partially attached to the first joint main body using a pair of fixing pins, and the peripheral edge is symmetrical. The other part of the position is attached to the second joint main body using a pair of fixing pins, and the first joint main body and the part of the second joint main body are in contact with the intermediate body. The portion is a raised portion having a hole portion into which the pair of fixing pins are partially inserted, and the fixing pin inserted into the raised portion through the intermediate body is the first joint main body or A universal shaft joint fixed to the second joint main body. The raised portion is configured separately from the first joint main body or the second joint main body and includes a pair of through holes through which the fixing pins are inserted , and the first joint main body or the second joint main body The universal shaft joint according to claim 1, wherein the universal shaft joint is configured to be attached to the planar end face of the first embodiment .   The said intermediate body is comprised by laminating | stacking several leaf | plate springs, The said leaf | plate springs are spot-welded in the attachment part which receives a pressure from the said protruding part, The free of Claim 1 or 2 characterized by the above-mentioned. Shaft coupling.   The fixing pin is a cylindrical nut having a head at one end, the head is applied to one surface of the intermediate body, and a cylindrical nut portion is tightly penetrated through the hole of the intermediate body to thereby raise the raised portion. The first joint main body and the second joint main body are formed with flange portions opposite to each other, and a tightening bolt that penetrates the flange section is screwed into the tube nut. The universal shaft joint according to any one of claims 1 to 3. A concave portion is provided between the through holes on the outer peripheral side of the intermediate body in the raised portion , and the fixing pin is a cylindrical nut having a head at one end, and the head is applied to one surface of the intermediate body with a press fit the cylindrical nut portion to the through hole of the raised portion by tightly through the hole of the intermediate, the intermediate plurality of leaf springs are stacked, in the ridge The universal shaft joint according to claim 2, wherein spot welding is performed within a range surrounded by the recess.

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