JPS6325420Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a tension adjustment device for a belt (including a chain) stretched between a driving rotary body and a driven rotary body to transmit the driving force of, for example, an engine. It is related to.

(Prior Art) A conventional example of this type of belt tension adjustment device is shown in FIG. 3, taking as an example a belt involved in driving an oil pump for power steering.

Engine side drive pulley 51 and oil pump 5
A belt 54 is stretched between the two driven pulleys 53, and the driven pulley 53 is rotatably supported by a moving member 55 to which an oil pump 52 is integrally fixed. The moving member 55 is attached to a fixed member 56 as an oil pump mounting base with three bolts 57, 58,
One end of the movable member 55 is fastened to the left side of the fixed member 56 with a bolt 57, and the other end is provided vertically apart on the right side of the fixed member 56 at two locations above and below. long hole 60,6
1, and with these bolts 57, 58, 59 temporarily fastened, the movable member 55 inserts the other two bolts 58, 59 into elongated holes centering on the attachment part of the bolt 57. It can be freely rotated by moving it along the insides of 60 and 61. Further, a screw hole 62 bored in the fixing member 56 is opened at the upper end of the upper long hole 60 among the long holes 60 and 61, and the tip of a tension bolt 63 that is screwed into this screw hole 62 is long. It protrudes into the hole 60.

Therefore, when adjusting the tension of the belt 54,
Three bolts 57, 5 fixing the moving member 55
8 and 59 are temporarily tightened, and the bolt 58 facing into the elongated hole 60 is in contact with the tip of the tension bolt 63, while adjusting the amount of protrusion of the tip of the tension bolt 63 into the elongated hole 60. The moving member 55 is rotated, thereby changing the distance between the driven pulley 53 on the oil pump 52 side and the driving pulley 51 on the engine side, and the amount of deflection of the belt 54 at the center between both pulleys 51 and 53 to a predetermined value. After that, bolts 57, 58, and 59 were tightened to fix the movable member 55 on the fixed member 56.

(Problem to be Solved by the Invention) However, with such a conventional belt tension adjustment device, it is necessary to press the belt 54 again to determine whether the tension of the belt 54 has been properly adjusted to a predetermined value. Moreover, if the adjustment is insufficient, the adjustment must be made again. Therefore, the adjustment work is not only troublesome and complicated, but also takes a long time, resulting in poor workability. Since the screw hole 62 must be drilled, the number of processing steps increases, and since the tension bolt 63 is used, the number of parts also increases.

(Means for solving the problem) The tension of the belt stretched between the driving rotary body and the driven rotary body is adjusted by a movable member that supports one of both rotary bodies and is rotatably attached to a fixed member. In the apparatus, a protrusion is formed on a part of the movable member, and an engaging part with which the tip of a torque wrench engages is formed in the protrusion, so that the torque wrench can be used. Then, a predetermined torque is applied to the moving member to rotate it, so that the tension of the belt between the two rotating bodies can be adjusted to a set value.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a belt tension adjustment device according to the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1.

A belt 4 is stretched between a driving pulley 1 on the engine side, which is a driving rotating body, and a driven pulley 3 on the side of an oil pump 2 for power steering, which is a driven rotating body, and the driven pulley 3 is integrated with the oil pump 2. is rotatably supported by a moving member 5 fixed to the
The moving member 5 is provided with protrusions 9, 10, and 11 having mounting holes 6, 7, and 8 formed at a total of three locations on the left side and right side of the oil pump 2, above and below.

12 is a fixed member fixed to the engine body as an oil pump mounting base, and the fixed member 12
has a notch 13 in the center, and a screw hole (not shown) is bored in the left side of the notch 13, and the screw hole is passed through the mounting hole 6 of the left protrusion 9 of the moving member 5. The bolts 15 are screwed together to connect the protrusions 9, and elongated holes 16 and 17 are formed at the upper and lower parts of the right side of the notch 14 at a distance from each other. The protrusions 10 and 11 formed on the upper and lower right sides of the moving member 5 face the upper protrusion 1.
Bolts 18 are inserted into the mounting hole 7 and elongated hole 16 of 0, and bolts 19 are inserted into the mounting hole 8 and elongated hole 17 of the lower protrusion 11, and both bolts 18 and 19 are inserted through the fixing member 12. The movable member 5 is connected to a nut plate (not shown) provided on the opposite side of the movable member 5, and thereby the movable member 5 is connected to the three bolts 1 on the fixed member 12.
5, 18, and 19, and with these bolts 15, 18, and 19 temporarily tightened, the movable member 5 can freely rotate on the fixed member 12 around the mounting hole 6 of the left protrusion 9. be.

By the way, the protrusion 10 of the movable member 5 attached to the upper elongated hole 16 of the fixed member 12 is made to protrude further than the other protrusions 9 and 11, and the tip of the protrusion 10 has a tapered hole 20. The tapered hole 20 opens at the flat end surface of the protrusion 10 and extends toward the center of the mounting hole 7, and has a smaller diameter on the mounting hole 7 side. Adjustable torque wrench 21
It serves as an engaging part for engaging.

The adjusting torque wrench 21 has a substantially rod-like shape, and has a tapered part 22 at its tip that is inserted into the taper hole 20, and its rear end is formed as a grip part 23 with knurling. , the rear end of the grip part 23 has a setting part 24 for setting the torque to be applied.

In the above, when the belt 4 stretched between the drive pulley 1 and the driven pulley 3 is bent and it is necessary to adjust the tension of the belt 4, first the movable member 5 is fixed to the fixed member 12. two bolts 1
5, 18, and 19 are temporarily fixed, and then the tapered portion 22 of the torque wrench 21 is inserted into and engaged with the tapered hole 20 formed in the protrusion 10 of the moving member 5,
Furthermore, if a torque set by the setting unit 24, that is, a torque corresponding to a predetermined value of the tension of the belt 4 between both pulleys 1 and 3 is applied in the direction of the arrow in the center of the figure by the torque wrench 21, the moving member 5 moves to the left protrusion. The belt 4 rotates counterclockwise in the figure around the attachment hole 6 of 9, and the distance between both pulleys 1 and 3 is changed.
The tension of the belt 4 becomes the set tension, and then the three bolts 1 are tightened while maintaining the tension of the belt 4 at the set tension.
5, 18, and 19 to fix the movable member 5 to the fixed member 12.

Thereby, by simply applying a predetermined torque to the moving member 5 with the torque wrench 21, the tension of the belt 4 between the driving pulley 1 and the driven pulley 3 can be adjusted to a set tension corresponding to the torque. .

In the above embodiment, the drive pulley 1 on the engine side
Although the device for adjusting the tension of the belt 4 stretched between the driven pulley 3 on the side of the oil pump 2 has been described, the present invention is not limited thereto, and can be applied to adjusting the tension of the belt in various mechanisms. It's something you get.

(Effects of the invention) As is clear from the above explanation, according to the invention,
A protrusion is provided on the movable member that supports one of the driving rotary body and the driven rotary body and is rotatably attached to the fixed member, and this protrusion is provided with an engaging portion that engages with a torque wrench, making it possible to move easily. By rotating the member with a predetermined torque using a torque wrench,
The tension of the belt between the two rotating bodies can be reliably adjusted to the set tension, and the adjustment work is easy.
This can be done in a short time, and all that is required is to provide a portion of the moving member that engages with the torque wrench, making it possible to configure this type of belt tension adjustment device with a simple structure without increasing the number of parts. The practical effects are remarkable.

Furthermore, in the present invention, since the engaging portion is formed as a tapered hole inside the protruding portion, there is no problem of the operator getting caught in this portion, thereby improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of a belt tension adjusting device according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a diagram similar to FIG. 1 showing a conventional example. In addition, in the drawing, 1 is a driving pulley, 3 is a driven pulley,
4 is a belt, 5 is a moving member, 10 is a protrusion, 12 is a fixed member, 20 is a tapered hole, 21 is a torque wrench, and 22 is a tapered portion.

Claims (1)

[Scope of utility model registration request] A belt is stretched between a driving rotary body and a driven rotary body, one of the driving rotary body and the driven rotary body is supported by a movable member rotatably attached to a fixed member, and the movable member is rotated. In a device in which the tension of the belt is adjusted by changing the distance between the driving rotary body and the driven rotary body, a protrusion is formed on a part of the movable member, and the protrusion is provided with a tip of a torque wrench. A belt tension adjustment device characterized by having a tapered hole that is engaged with a tapered portion.