JP2533656Y2 - Universal shaft coupling - Google Patents

Description

[Detailed description of the invention] [Overview of application field and invention] The invention relates to a so-called universal joint that couples a pair of input / output shafts in a crossed state in a transmission state.
Simplifies the overall configuration and facilitates component replacement for universal joints that can be transmitted even under conditions where there is a gap between the intersection of the extension line of the input / output shaft and the center of the universal joint. Things. In addition, it is intended to improve the assembling accuracy of each part.

[Prior art and its problems] A hook joint, which is one of universal joints, needs to be used under conditions where the intersection of the extension of the axis of the input / output shaft and the joint center coincide. On the other hand, even if there is a slight deviation between the joint center and the intersection of the extension lines of the input and output shafts, the type shown in FIG. Is used.

As shown in the figure, this is composed of an intermediate body (1) and first and second connection bodies (2) opposed to each other across the intermediate body (1).
(3).

In the intermediate body (1), four pins are arranged at 90-degree intervals and in a posture facing in the radial direction. Of these pins, a pair of pins (11) located in a direction opposite to each other are arranged. (11)
Is paired with the first connection main body (2) and the other pair of pins (12) and (12) is paired with the other second connection main body (3). In order to realize this pair of cylinders, in this conventional apparatus, a pair of arms (21) and (21) are attached to the flange (20) of the first connection main body (2) in parallel with the axis of the first connection main body (2). And the flange (30) of the other second connection main body (3)
Similarly, a pair of arms (31) and (31) are protruded from the arm (2).
1) Insert the pin (11) into the through hole (22) (22) formed in (21).
(11) is inserted separately, and the other pins (12) and (12) are inserted separately into through holes (32) and (32) formed in the other arms (31) and (31).

In this case, as shown in FIG. 7, a first connecting subject (2) is attached to an input shaft (A), and a second connecting subject (3) is attached to an output shaft (B). Since the pin (11) and the through-hole (22) and the pin (12) and the through-hole (32) are in a pair of cylinders, the relative movement of each pin in the axial direction and the relative rotation in the rotation direction in the pair of cylinders. Movement is possible. Therefore, even if the intersection between the input shaft (A) and the output shaft (B) is slightly displaced from the center of the joint, the input shaft (A)
Is transmitted to the output shaft (B) via the intermediate (1).

However, in this conventional device, the first connection subject (2)
And a pair of arms (31) and (31) are screwed to the flange (30) of the second connection main body (3), and the pair of arms (31) and (31) are screwed to the flange (20) of the second connection main body (3). However, there is a problem that the transmission torque cannot be set to a sufficiently large value.
This is because the fixing bolt (N) for attaching the arm (21) and the arm (31) cannot be set large enough, and the coupling force between the arm (21) and the arm (31) and the flange cannot be sufficiently increased. This is because it cannot be set large. Further, since the intermediate body (1) usually adopts a structure in which pins are swaged at four points on the outer peripheral portion, the connecting part between the intermediate body (1) and each pin is also connected to the connecting part. There are certain limitations on strength. As described above, the portion where the stress is most concentrated in the torque transmitting state is a state in which the separate members are joined by means such as screwing or caulking, so that the transmitting torque cannot be set sufficiently large. .

Further, in the above-mentioned conventional joint, it is necessary to mount the mounting screws (N) and (N) from the axial direction of the input shaft (A) or the output shaft (B) when disassembling and repairing the joint, and this work is troublesome.

The present invention is based on “a first connection body (2) connected to an input shaft (A), a second connection body (3) connected to an output shaft (B), and an intermediate (1) connecting these. Become the first
A pair of arms (21) at symmetrical positions on the outer periphery of the connection body (2)
(21) is projected inward in the axial direction, and a pair of arms (31) and (31) are provided at symmetrical positions on the outer peripheral portion of the second connection main body (3).
Similarly, projecting inward in the axial direction, interposing a pin radially projecting from one arm toward the other between each arm and the intermediate body (1), and attaching each pin to each arm or intermediate body. The center of the joint and the input / output shaft (A)
(B) A universal shaft joint capable of transmitting torque even under conditions where the intersection of the extension line does not coincide with the universal joint ", the transmission torque can be set large and the assembly and disassembly and repair of the joint can be performed easily. Another object of the present invention is to make it possible to simplify the whole and to improve the assembling accuracy of each part.

* Regarding the invention of claim 1 [Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that "the intermediate body (1) is located on the inner peripheral side of the arms (21) and (31), A recess (15) for attaching the pin is provided on the outer peripheral surface of the intermediate body (1), and the end of the pin is closely fitted into the recess (15) and the recess (15) is formed. The bottom surface and the end face of each pin are in close contact with each other, and the pin is screwed to the intermediate body by a mounting screw (N) that penetrates the pin. Is a large-diameter hole for receiving the entire head (H) of the mounting screw (N) in a immersed state and the mounting screw (N).
A stepped through hole comprising a small diameter hole portion through which the shaft portion is inserted; a hexagonal hole (D) for tool engagement provided on an end face of a head (H) of the mounting screw (N); In (N), the boundary step between the shaft section and the head (H) is in contact with the step section of the stepped through hole.

[Operation] The above technical means of the present invention operates as follows.

The combination of the first connection main body (2) and the second connection main body (3) with the intermediate body (1) is basically the same as that of the conventional one. (1) The through-holes of the arms (21) (21) projecting from the connection body (2) are aligned with the screw holes of the intermediate body (1), and the arms (21) are aligned.
Screw the pin from the outside of (21) using the mounting screw (N). At this time, the tool is screwed into the hexagonal hole (D) for tool engagement formed on the head of the mounting screw (N) so as to correspond to the tool. Thereby, each of the pins and the arm (21) (2
1) and are assembled in a pair of cylinders.

At this time, one end of the pin is connected to the intermediate (1)
The pins are screwed in a state where the pins are tightly fitted into the recesses (15) formed on the outer peripheral surface of the pin and the end faces of the pins are in close contact with the bottom surfaces of the recesses (15). The mounting position and mounting posture of the pin have the accuracy set in relation to the recess (15).

In this mounting state, the mounting screw (N) penetrating the pin is housed in a state where its head (H) is completely immersed in the large-diameter hole of the stepped through hole penetrating the pin. The lower end surface of the head (H) is fixed to the step portion of the stepped hole portion in contact with the step portion.

Therefore, the head (H) does not protrude from the end face of the pin, and the fixing strength by the mounting screw (N) is sufficient.

Next, the arm (31) (31) of the other second connection subject (3)
Is positioned on the outer periphery of the intermediate body (1), the screw hole of the intermediate body is made to coincide with the through hole of the arm (31) in the same manner, and the pin is screwed into the screw hole using a similar tool. . As a result, the pin and the arms (31) and (31) form a cylindrical pair.

In disassembling and repairing, the pin may be removed by removing the mounting screw (N) from the outer peripheral side of the intermediate body (1) with a tool corresponding to the hexagonal hole (D).

Further, the pin has a sufficient diameter, and the diameter of the mounting screw (N) penetrating the pin can be set sufficiently large.
The end face of each pin is attached in such a manner that it is closely fitted into the recessed part (15) of the intermediate body which has been finished to a predetermined accuracy in advance, and the mounting screw of the intermediate body (1) is adjusted to the accuracy of the protruding posture of the pin. (N) does not affect the accuracy of the screw fitting portion.

[Effects] The present invention has the following specific effects because of the above configuration.

Since the components of the first connection main body (2) and the second connection main body (3) are formed integrally and only separate pins are assembled, the overall configuration is simpler than the conventional one. become.

Also, when assembling, the pins are merely screwed in the radial direction from the outer peripheral side of the universal joint, so that the number of assembling steps is reduced and the work can be sped up.

When disassembling the joint in use, if the tool is made to correspond in the radial direction from the outer peripheral area of the joint, the intermediate body (1) can be taken out, so that repair and inspection of this part is easy. Furthermore, the above procedure makes it possible to easily replace the pin with the lowest durability, so that the most frequently replaced parts can be easily replaced, and repair of this part can be performed very easily.

In addition, since the diameter of the threaded portion of the threaded portion of the pin can be made sufficiently large, the strength of these joints, which are the least intense, becomes sufficient, and at this point, the transmission torque can be set large.

Further, since each pin is fixed in such a manner as to be tightly fitted into the recess (15) formed on the outer peripheral surface of the intermediate body (1) by the mounting screw (N) penetrating the pin, the mounting screw (N) is used. Even if the precision of the screw fitting portion is insufficient, the precision of the mounting posture of the pin becomes sufficient, and as a result, the cylindrical pair of pins becomes smooth. Further, the bonding strength between the pin and the intermediate (1) is high.

* Regarding the invention of claim 2 This invention solves the same problem as the invention of claim 1, but changes the structure of the intermediate body (1) and the object to which the pin is attached, and changes the intermediate body (1). Another object of the present invention is to make it possible to reduce the overall width in the axial direction by positioning the first and second connection main bodies (2) and (2) on the outer periphery.

[Technical Means] The technical means of the present invention for solving the above-mentioned problems is as follows.
"The intermediate body (1) formed in a ring shape is positioned on the outer peripheral side of the arms (21) and (31), and the pins are penetrated through the intermediate body in a paired cylindrical state. A concave portion (15) for attaching the pin is provided on the surface, and the concave portion (1) is provided.
In 5), the end of the pin is closely fitted, and the bottom surface of the concave portion (15) and the end surface of each pin are in close contact. The pin is attached to the arm by a mounting screw (N) passing through the pin. (21) It is screwed to each of (31), and the pin
A stepped through hole including a large-diameter hole for accommodating the entire head (H) of the mounting screw (N) in a immersed state and a small-diameter hole for inserting a shaft of the mounting screw (N); A hexagonal hole (D) for tool engagement is provided on an end face of the head (H) of the mounting screw (N), and a boundary step between the shaft portion of the mounting screw (N) and the head (H) is formed. The step portion of the stepped through hole comes into contact with each other. "

[Operation] The above technical means of the present invention operates as follows.

The universal shaft joint is assembled by screwing four pins from the outer peripheral side of the joint in the same manner as in the invention of the first aspect. Conversely, by removing the four pins, the joint can be disassembled in the same manner as the joint of the present invention.

In this invention, each pin is connected to the first connection body (2) or the second connection body (2).
The screw is screwed into the arm (21) or the recess (15) of the arm (31) formed in the connection main body (3) so as to be tightly fitted. The rotation torque from the first connection main body (2) is transmitted from the pin to the annular main body (10), and the arm (3)
1) It reaches the pin screwed into (31) and is transmitted to the second connection subject (3).

Further, in the present invention, since there is no need to interpose the intermediate body (1) between the first connection subject (2) and the second connection subject (3), the first connection subject (2) and the The distance between the two connection entities (3) can be set small. Further, the size of the flange mainly composed of these joints is smaller than that of the joint of the first aspect.

[Effects] In addition to the effects of the present invention and the invention of the first aspect, the following effects are provided.

Since the distance between the first connection main body (2) and the second connection main body (3) can be set small and the flange of the joint main body can be made small, the whole can be reduced in size and weight.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

The embodiment shown in FIGS. 1 and 2 is an embodiment of the invention of claim 1. In this universal joint, the intermediate body (1) has an opening at the center as shown in FIG. A square plate body, each of which has a top as a pin mounting plane (13), and the pin (11) or the pin (12) is screwed to the pin mounting plane, and a pair extending in opposite directions to each other. Pin (11) (11) on the end face of the pin mounting plane (13) (13)
Are screwed together with the mounting screw (N) in a state in which the pin (1) is in close contact with the other pair of pin mounting planes (13) and (13).
2) Screw (12) in the same way.

As shown in FIG. 1, a shallow concave portion (15) is formed in each of the pin mounting planes (13), and the diameter of the concave portion is a predetermined fit with the diameter of the pin (11) or the pin (12). Joint tolerance (JI
S is set to about H-7), and a female screw portion (16) is formed at the center thereof. In addition, the concave portion (1
The flatness of the bottom surface and the flatness of the end surface of each pin in 5) are finished with a predetermined accuracy, and the posture of each pin is appropriately set when both planes are in close contact.

Each of the pins is formed in a cylindrical shape, and an enlarged diameter portion (W) into which a head (H) of a mounting screw (N) is loosely fitted is formed at an outer end thereof. Further, the length of the pin (11) or the pin (12) is set to a predetermined length, and in the assembled state, the outer peripheral surface of the arm (21) or the arm (31) is formed by the top of the pin and the mounting screw (N). It is designed to substantially coincide with the end face of the head (H).

Next, the first connection subject (2) or the second connection subject (3)
Have the same configuration, and are mounted on the intermediate body (1) by rotating the mounting angle by 90 degrees. Therefore, here, one first connection subject (2) will be described in detail.

A shaft connecting portion (4) for connecting the input shaft (A) protrudes from the center of the outer surface of the flange (20) of the first connection main body (2). A pair of arms (21) and (21) protrude in parallel with the axis of the first connection main body (2) on the diameter line of, and a through hole (22) is formed in each of the arms (21) and (21). . A fluorine resin-based dry metal layer (23) is formed on the inner peripheral surface of the through hole (22), and the inner peripheral diameter of the dry metal layer (23) and the diameter of the pin (11) or the pin (12) are changed. The outer diameter is set to a predetermined fit tolerance, and the cylinders are fitted in a paired state.

As shown in FIG. 3, the shaft connecting portion (4) is formed of a pair of slits provided with annular members concentric with a shaft insertion hole (40) formed through the flange (20) at mutually symmetric positions. (S) It consists of a semicircular fastening body (41) (42) divided into two parts by (S), and the base end of each fastening body is left uncut in the center (43). The area up to the formation area of the slit (S) is cut and separated from the flange (20). Therefore, the uncut portion (4) of the tightening body (41) (42)
The portion outside of 3) is in an elastically deformable state. A clamping bolt (P) is interposed between the free ends of the semicircular arc-shaped fastening bodies (41) and (42).

The tightening bolt (P) is disposed so as to pass through a through hole formed at an end of one of the tightening bodies and to be screwed to an end of the other tightening body. (41) The screwing directions of the tightening bolts (P) and (P) at both ends of (42) are set opposite to each other.

Therefore, when the input shaft (A) is inserted into the shaft insertion hole (40) with the tightening bolts (P) (P) loosened and the tightening bolts (P) (P) are tightened, the tightening body ( 41) (4
Since the portion other than the uncut portion (43) of (2) can be bent in the radial direction, the inner peripheral surface of these tightening members tightens the outer peripheral surface of the input shaft (A), and the frictional force of this portion Thereby, the fastening body and the input shaft (A) are connected in a transmission state.

The configuration of the other second connection main body (3) is the same as the configuration of the first connection main body (2), and the arm (2) is integrally formed on the inner surface.
1) Arms (31) and (31) similar to those of (21) are formed, and the shaft connection portion (4) is provided on the outer surface, and the output shaft (B) is connected to this.

The second embodiment shown in FIG. 4 and FIG.
In this embodiment, an annular body having a rectangular cross section and a constant width is used as an intermediate body (1), and a flange (20) of a first connection main body (2) is used.
And the flanges (30) of the second connection main body (3) are opposed to each other at regular intervals, and these flanges are located concentrically on the inner peripheral side of the intermediate body (1). And a pair of arms (21) projecting on the diameter line of the inner surface of the flange (20)
(21) and a pair of arms (31) (31) protruding on the diameter line of the inner surface of the flange (30) are arranged alternately and continuously in the circumferential direction. The arm (21) and the arm (31) are provided with a female screw portion (16) penetrating in the radial direction, and the female screw portion (16) is provided with a pin (11) or a pin (12) in the first embodiment. The screw is screwed in the same manner as in the case of the example, and as these pins, the pins having the same structure as the above-described first embodiment are employed.

Therefore, the first connection main body (2), the second connection main body (3) and the intermediate body (1) are positioned as described above, and pins are inserted into the through holes (22) and (22) formed in the intermediate body (1). (11) (1
Insert the arm (21) (2) with the mounting screw (N).
Screw it into the female thread (16) of 1) and insert through holes (32) (3
Insert the pins (12) and (12) into 2) and screw them to the female threads (16) of the arms (31) and (31) with the mounting screws (N) to complete the universal joint.

In this embodiment, the through hole (22) and the through hole (3
In 2), a dry metal layer (23) is formed on the inner peripheral surface, and each pin smoothly mates with these.

In particular, in this embodiment, the distance between the outer surfaces of the flanges (20) and (30) is made equal to the width of the intermediate body (1). The diameters of the flanges (20) and (30) are set so that the outer circumference of the flanges (20) and the inner circumference of the intermediate body (1) have a certain gap.

Therefore, in this embodiment, when the input shaft (A) and the output shaft (B) of the motor are connected in a transmission state using the universal shaft joint, the mounting position of the motor is set to the output shaft (B). ) Is significantly eccentric to
If the gap between the flange (20) or the flange (30) and the intermediate body (1) becomes uneven and the mounting angle of the motor is significantly inappropriate, the outer surface of the flange (20) or the flange (30) Will protrude partly outward from the edges on both sides of the intermediate body (1). Thus, the intermediate (1) and the flange (2
0) or the unevenness of the gap with the outer periphery of the flange (30) and the degree of protrusion of the flanges (20) and (30) from the edge of the intermediate body (1) make it possible to confirm the mounting accuracy of the motor.

Also in this embodiment, the first connection main body (2) and the second connection main body (3) are manufactured by the same method as in the above-described first embodiment. Also, a similar shaft connection (4) is provided. Therefore, the connection structure of the input shaft (A) or the output shaft (B) is the same as in the above embodiment.

[Brief description of the drawings]

FIG. 1 is a side view of a partially cutaway of the first embodiment, and FIG.
X sectional view, FIG. 3 is a sectional view taken along the line YY, FIG. 4 is an explanatory view of the second embodiment, FIG. 5 is an explanatory view of the intermediate (1), FIG. 6 and FIG. It is an explanatory view, in which (A) ... input shaft (2) ... first connection subject (B) ... output shaft (3) ... second connection subject (1) ... intermediate (21) (31) Arm (20) (30) Flange (22) (32) Through hole (11) (12) Pin (N) Mounting screw

Claims (2)

(57) [Scope of request for utility model registration] 1. A first connecting body (2) connected to an input shaft (A), a second connecting body (3) connected to an output shaft (B), and an intermediate (1) connecting these. Become the first
A pair of arms (21) at symmetrical positions on the outer periphery of the connection body (2)
(21) is projected inward in the axial direction, and a pair of arms (31) and (31) are provided at symmetrical positions on the outer peripheral portion of the second connection main body (3).
Similarly, projecting inward in the axial direction, interposing a pin radially projecting from one arm to the other between each arm and the intermediate body (1), and connecting each pin to each arm by a cylindrical pair. The center of the joint and the input / output shaft (A) (B)
Arm (21) (31) in a universal joint capable of transmitting torque even under conditions where the intersection of the extension lines of
The intermediate (1) is located on the inner peripheral side of the
A concave portion (15) for attaching the pin is provided on the outer peripheral surface of the pin. The end of the pin is closely fitted into the concave portion (15), and the bottom surface of the concave portion (15) and the The pin is screwed to the intermediate body by a mounting screw (N) penetrating the pin, and the entire head (H) of the mounting screw (N) is immersed in the pin. A stepped through hole comprising a large-diameter hole accommodated in the mounting screw and a small-diameter hole through which the shaft of the mounting screw (N) is inserted is provided, and a tool is provided on the end face of the head (H) of the mounting screw (N). A universal joint in which a hexagonal hole (D) for engagement is provided, and a boundary step between the shaft portion of the mounting screw (N) and the head (H) abuts on a step of the stepped through hole. . 2. A first connecting body (2) connected to the input shaft (A), a second connecting body (3) connected to the output shaft (B), and an intermediate (1) connecting these. Become the first
A pair of arms (21) at symmetrical positions on the outer periphery of the connection body (2)
(21) is projected inward in the axial direction, and a pair of arms (31) and (31) are provided at symmetrical positions on the outer peripheral portion of the second connection main body (3).
Similarly, projecting inward in the axial direction, and interposing a pin radially projecting from one arm to the other between each arm and the intermediate body (1), thereby connecting each pin to the intermediate body (1). In a universal joint capable of transmitting torque even under conditions where the center of the joint does not coincide with the intersection of the extension lines of the input / output shafts (A) and (B), the arm (21) (31) ), An intermediate body (1) formed in a ring shape is positioned on the outer peripheral side, and a concave portion (15) for attaching the pin is provided on the outer peripheral surface of the arm (21) (31), and the concave portion (15) is provided. ), The ends of the pins are closely fitted and the bottom surfaces of the recesses (15) and the end faces of the pins are in close contact with each other, and the pins are attached to the arms (N) by mounting screws (N) passing through the pins. 21) Screwed to each of (31), and the pin is attached to the head (H) of the mounting screw (N). A stepped through hole including a large-diameter hole portion that accommodates the whole in a immersed state and a small-diameter hole portion through which the shaft portion of the mounting screw (N) is inserted is provided, and the head (H) of the mounting screw (N) is A hexagonal hole (D) for tool engagement is provided on the end face, and the shaft part of the mounting screw (N) and the stepped part of the stepped through hole are mutually in contact with the stepped part of the head (H). A universal shaft joint that touches.