JP5055313B2 - Shaft coupling - Google Patents

Description

  The present invention relates to a shaft coupling that connects two rotating shafts and transmits the power of one rotating shaft to the other rotating shaft.

  2. Description of the Related Art Conventionally, a shaft coupling is provided as one that connects two rotating shafts and transmits the power (torque) of one rotating shaft to the other rotating shaft. In this shaft coupling, a cylindrical bush is press-fitted into a bolt hole penetrating between flange portions provided at opposite shaft ends, and a bolt is further inserted into the press-fitted bush. There are some that are tightened with nuts. Accordingly, a tightening force is applied between the flange portions by screwing the bolt and the nut, and power is transmitted by the shearing force of the bush itself.

  Such shaft couplings in which the fastening force and the shearing force are respectively divided and handled by individual components are disclosed in Patent Documents 1 and 2, for example.

Japanese Utility Model Publication No.59-13726 Japanese Utility Model Publication No. 62-44137

  However, in the conventional shaft coupling described above, a nut, a washer, and a screw pin must be used to prevent the bolt from loosening. Also, in order to prevent the bush from being pulled out, the bush itself has a bolt hole. Protruding heads must be formed or seated nuts must be used. Thereby, there existed a problem that the number of parts will increase and the structure of a shaft coupling will become complicated.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a shaft coupling that can prevent loosening and removal of parts with a simple configuration.

The shaft coupling according to the first invention for solving the above-mentioned problems is
The first mating surface provided at the end of the first rotating shaft and the second mating surface provided at the end of the second rotating shaft so that the first rotating shaft and the second rotating shaft are uniaxial. In the shaft coupling that connects
A bolt hole and a pin hole penetrating the first mating surface and the second mating surface;
A bolt that is inserted into the bolt hole and provides a fastening force between the first mating surface and the second mating surface;
A pin that is inserted into the pin hole and transmits power between the first mating surface and the second mating surface by its own shearing force;
The bolt is
It has a flange portion that is seated on a seating surface opposite to the first mating surface or the second mating surface and covers the pin hole.

The shaft coupling according to the second invention for solving the above-mentioned problems is
The bolt holes and the pin holes are alternately provided in the circumferential direction,
The pin hole into which the pin is inserted is covered with the flange portion of the bolt inserted into the bolt hole adjacent to the pin hole.

A shaft coupling according to a third invention for solving the above-described problem is as follows.
The pin and the flange portion are in contact with each other.

A shaft coupling according to a fourth aspect of the present invention for solving the above problem is
An elastic member is provided between the flange portion and the pin.

  Therefore, according to the shaft coupling according to the present invention, when the bolt and the pin are inserted into the bolt hole and the pin hole penetrating the first mating surface of the first rotating shaft and the second mating surface of the second rotating shaft, The bolt flange is seated on the seating surface opposite to the first mating surface or the second mating surface to cover the pin hole, thereby preventing the bolt from loosening and preventing the pin from coming off. Can be achieved.

It is sectional drawing of the shaft coupling which concerns on one Example of this invention. It is A arrow directional view of FIG. It is BB arrow sectional drawing of FIG. It is principal part sectional drawing when an elastic member is interposed.

  Hereinafter, a shaft coupling according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the shaft coupling according to the present invention connects an output shaft (drive shaft) 11 and an input shaft (driven shaft) 21 that are rotatably supported, and the power of the output shaft 11. (Torque) is transmitted to the input shaft 21.

  The output shaft 11 is formed in a cylindrical shape, and a flange portion 12 is provided at an end portion thereof. The flange portion 12 is formed with a plurality of bolt holes 13 and pin holes 14 which are through holes. The bolt holes 13 and the pin holes 14 are alternately spaced at equal angular intervals in the circumferential direction of the flange portion 12. Has been placed. The flange portion 12 has a mating surface 12a on the input shaft 21 side and a seating surface 12b on the opposite side of the mating surface 12a.

  The input shaft 21 is formed in a cylindrical shape, and an end face thereof is provided with a mating surface 22 that faces the mating surface 12a of the flange portion 12. A plurality of bolt holes 23 and pin holes 24 that are bottomed holes are formed in the mating surface 22, and the bolt holes 23 and the pin holes 24 are alternately spaced at equal angular intervals in the circumferential direction of the mating surface 22. Is arranged in. A female screw portion 23 a is formed on the inner peripheral surface of the bolt hole 23. The bolt holes 13 and 23 and the pin holes 14 and 24 are formed to have the same inner diameter.

  That is, when the mating surface 12a of the output shaft 11 and the mating surface 22 of the input shaft 21 are connected, the bolt holes 13 and 23 are in contact with each other and the pin holes 14 and 24 are in contact with and in communication with each other. It will be. Bolts 31 are inserted into the bolt holes 13 and 23 in contact with each other, and pins 41 are inserted into the pin holes 14 and 24 in contact with each other.

  The bolt 31 includes a hexagonal head portion 32 that can be engaged with a hexagon wrench (not shown), a flange portion 33 formed at an end portion of the head portion 32, and a male screw portion 34 formed at the tip end side thereof. Have. Therefore, by inserting the bolt 31 into the bolt holes 13 and 23 that are in contact with each other, the flange portion 33 is seated on the seating surface 12b of the flange portion 12, and the male screw portion 34 is screwed with the female screw portion 23a of the bolt hole 23. Match. Thereby, fastening force is given between the mating surfaces 12a and 22. Note that when the bolt 31 is fastened, the flange portion 33 plays the same role as a nut or a washer, so that the bolt 31 is prevented from loosening.

  The pin 41 has a rod shape and is formed to have the same length (depth) as the length of the pin holes 14 and 24 in contact with each other. Accordingly, by inserting the pin 41 into the pin holes 14 and 24 in contact with each other, the power of the output shaft 11 is transmitted to the input shaft 21 by the shearing force of the pin 41 itself when the output shaft 11 is driven (rotated). Will be.

  Here, as shown in FIGS. 1 to 3, the radius of the flange portion 33 is slightly shorter than the inter-axis distance between the bolt holes 13 and 23 and the pin holes 14 and 24. Thereby, when the bolt 31 is fastened, a part of the flange portion 33 covers a part of the opening of the pin holes 14 and 24 on both sides adjacent to the bolt holes 13 and 23 into which the bolt 31 is inserted. It has become.

  That is, since the flange portion 33 protrudes from both sides in the circumferential direction of the flange portion 12 with respect to the pin holes 14 and 24, the pin holes 14 and 24 are inserted into the protruding portions of the flange portion 33. The end face of the pin 41 comes into contact. Thus, the pin 41 is prevented from being pulled out by the flange portion 33 of the bolt 31.

  Further, as described above, since the flange portion 33 covers the pin holes 14 and 24, when the pin 41 moves to the flange portion 33 side due to vibration during power transmission, the pin 41 is The flange portion 33 is pressed. As a result, a pressing force acts on the bolt 31 in the pulling direction, so that the screwing force between the male threaded portion 34 of the bolt 31 and the female threaded portion 23a of the bolt hole 23 is increased. It will be possible to prevent loosening.

  When assembling the shaft coupling, first, the mating surface 12a of the output shaft 11 and the mating surface 22 of the input shaft 21 are brought into contact with each other, and the bolt holes 13 and 23 and the pin holes 14 and 24 are aligned. Next, after the pin 41 is inserted into the contacted pin holes 14 and 24, the bolt 31 is inserted into the contacted bolt holes 13 and 23, and the flange portion 33 is brought into contact with the seating surface 12 b of the flange portion 12. At the same time, the external thread portion 34 is screwed with the internal thread portion 23 a of the bolt hole 23. As a result, the output shaft 11 and the input shaft 21 are connected to each other, and a part of the flange portion 33 covers a part of the opening of the pin holes 14 and 24.

  Here, when the bolt 31 and the pin 41 are inserted, the pin 41 may be completely inserted into the pin holes 14 and 24 and then the bolt 31 may be inserted into the bolt holes 13 and 23. While the bolts 31 are inserted in a state where the pin 41 is inserted into the pin holes 14 and 24, the pin 41 may be pushed in and completely inserted by the flange portion 12.

  Therefore, by driving the output shaft 11, the power is transmitted to the input shaft 21 by the shearing force of the pin 41 itself. At this time, the flange portion 33 of the bolt 31 prevents the bolt 31 from loosening and prevents the pin 41 from coming off.

  In the above-described embodiment, the flange portion 12 is provided only on the output shaft 11. However, the same flange portion may be provided on the input shaft 21 or the flange portion may be provided only on the input shaft 21. In addition, both the output shaft 11 and the input shaft 21 may be provided with only the mating surfaces without providing flange portions.

  Moreover, although the flange part 33 was integrally formed with respect to the volt | bolt 31, it is good also as a different body. That is, you may provide the flange part 33 separately so that it may become a washer.

  Furthermore, although the length of the pin 41 is formed to be the same as the length of the pin holes 14 and 24 that are in contact with each other at the time of connection, the length of the pin holes 14 and 24 that are in contact with each other as shown in FIG. It is also possible to use a pin 42 having a length shorter than that, and to interpose an elastic member 51 such as resin, rubber, or disc spring between the pin 42 and the flange portion 33. Thereby, even if the pin 42 does not move to the flange portion 33 side due to vibration, the elastic member 51 always presses the flange portion 33. As a result, since the pressing force always acts on the bolt 31 in the pulling direction, the prevention of loosening of the bolt 31 can be improved.

  Therefore, according to the shaft coupling according to the present invention, the bolt 31 and the pin 41 are provided in the bolt holes 13 and 23 and the pin holes 14 and 24 penetrating the mating surface 12a of the output shaft 11 and the mating surface 22 of the input shaft 12. When inserted, the flange portion 33 provided on the bolt 31 is seated on the seating surface 12b opposite to the mating surface 12a to cover the pin holes 14 and 24, thereby simplifying the number of parts. In addition, the bolt 31 can be prevented from loosening and the pin 41 can be prevented from coming off.

  Further, by providing the flange portion 33 on the bolt 31, it is not necessary to use a nut, a washer, a screw pin or the like used in a conventional shaft coupling, so that only the bolt 31 and the pin 41 are used. Work and disassembly work can be easily performed. Furthermore, the screwing pin used in the conventional shaft coupling becomes difficult to reuse after disassembling the shaft coupling, but only the reusable bolt 31 and the pin 41 are used, so the cost is reduced. be able to.

  The present invention is applicable to a shaft coupling that improves durability and reliability of power transmission.

11 Output shaft 12 Flange portion 12a Mating surface 12b Seat surface 13 Bolt hole 14 Pin hole 21 Input shaft 22 Mating surface 23 Bolt hole 23a Female thread portion 24 Pin hole 31 Bolt 32 Head 33 Flange portion 34 Male thread portion 41, 42 Pin 51 Elastic member

Claims (4)

The first mating surface provided at the end of the first rotating shaft and the second mating surface provided at the end of the second rotating shaft so that the first rotating shaft and the second rotating shaft are uniaxial. In the shaft coupling that connects
A bolt hole and a pin hole penetrating the first mating surface and the second mating surface;
A bolt that is inserted into the bolt hole and provides a fastening force between the first mating surface and the second mating surface;
A pin that is inserted into the pin hole and transmits power between the first mating surface and the second mating surface by its own shearing force;
The bolt is
A shaft coupling comprising a flange portion that is seated on a seating surface opposite to the first mating surface or the second mating surface and covers the pin hole. The shaft coupling according to claim 1,
The bolt holes and the pin holes are alternately provided in the circumferential direction,
The pin hole into which the pin is inserted is covered with the flange portion of the bolt inserted into the bolt hole adjacent to the pin hole. The shaft coupling according to claim 1 or 2,
The shaft and the flange are in contact with each other. The shaft coupling according to claim 1 or 2,
An axial member is provided between the flange portion and the pin.

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