JPH0214932Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a wrench used when attaching and detaching tires on large vehicles such as trucks and buses.

(Prior art and its problems) To install and remove large tires of this type, a foil nut trench whose tip is bent at 90 degrees is used, and the worker stands on the tip of the wrench and puts his weight on it to tighten or remove it. is doing some loosening work. This work requires physical strength, and when putting your weight on the foil nut trench, your foot may slip from the wrench, or the wrench may suddenly come off the nut, causing you to lose your balance and cause injury to your body. There were problems with work safety.

The applicant has previously proposed various power wrenches for attaching and detaching large bolts and nuts used in the fields of architecture, bridges, and machinery. In view of this problem, we attempted to use this power wrench to attach and detach tightening bolts and nuts for large tires.

However, as shown in FIG. 1, the large tire 8 is mounted on a hub drum 81, and the hub drum 81 has a bearing part 82 protruding from the center and a curved outer circumferential part to form a peripheral wall 80. The annular portion 85 in which 84 is disposed is narrow. For this purpose, 1 in Figure 5
As shown by the dotted chain line, when trying to apply the reaction force receiver 6a for preventing the wrench from rotating, which is unique to the power wrench, to the nut 84, the bearing part 82 or the peripheral wall 80 gets in the way, making it impossible to use it. Ta.

Even if the wall thickness of the reaction force receiver 6a is made thinner so that it can be used within the narrow space of the hub drum 81, the arrangement pitch of the tire mounting nuts differs depending on the car model, so it is not versatile and needs to be adapted to each car model. I had a problem where I had to design a power wrench.

Furthermore, in the conventional power wrench, the reaction force receiver 6a
Since the power wrench is simply placed against the side of the nut, the input shaft of the wrench must be rotated while supporting the power wrench with one hand and keeping the reaction force receiver 6a against the nut. The problem was that it was more troublesome to hold the wrench than it was to hold it, making it cumbersome to handle.

(Means for solving the problem) The present invention improves the shape of the reaction force receiver, making it easy to handle and attaching and detaching mounting bolts and nuts for large tires. This reveals a versatile power wrench.

The power wrench of the present invention has an input shaft 5 protruding from one end of a case 1 and an output shaft 4 protruding from the other end, and a deceleration/power-up mechanism that connects both shafts is interposed inside the case 1. A reaction force receiver 6 is protrudingly provided on the holder 6 to prevent the case 1 from rotating by applying it to a protruding object near the tightening bolt or nut.

The feature of the power wrench of the present invention is that the reaction force receiver 6 is formed of a fitting part 62 with a hole into which a nut is fitted, and an arm 61 that connects the fitting part 62 to the case 1. 65 is formed into a long hole,
The reaction force receiver 6 is entirely curved in an arc shape in either the tightening rotation direction or the loosening rotation direction.

(Operation and Effect) The socket 7 is fitted into the nut 84 to be loosened, the output shaft 4 of the wrench is connected to the socket, and the reaction force receiver 6 is fitted into another nut 84a located near the nut 84.

Since the power wrench engages the two nuts 84, 84a, even if the power wrench is released, the wrench maintains its sideways position. Therefore, when rotating the input shaft 5 of the wrench, you can lightly support the wrench with one hand and rotate it with the other hand.
Unlike conventional power wrenches, it does not require much force to support it, making it easy to handle.

In addition, the fitting portion 62 of the reaction force receiver 6 is fitted with a nut 84a.
Even if the wall thickness of the fitting portion 62 is thin, it can have sufficient strength to receive the tightening reaction force. Therefore, even if the space around the nut is narrow, there is no problem in engaging the fitting portion 62 with the nut 84a.

In addition, since the reaction force receiver 6 is entirely curved in an arc shape in either the tightening rotation direction or the loosening rotation direction, a bearing portion 82 protrudes from the center like a hub drum 81. Also, arm 6 of reaction force receiver 6
1 does not hit the bearing portion 82, and there is no problem in use.

Furthermore, there is a hole 65 into which the nut 84 of the reaction force receiver 6 is fitted.
Since the hole is an elongated hole, it can be engaged even if the arrangement pitch of the nut 84 is different depending on the size of the tire 8, and it is versatile.

(Embodiment) A case 1 of a power wrench is composed of a large-diameter cylindrical portion 11 that accommodates a deceleration and force-increasing mechanism, and a small-diameter cylindrical portion 12 that protrudes from one end of the cylindrical portion and rotatably accommodates an output shaft 4.

The deceleration and power increase mechanism of the embodiment includes a first planetary gear mechanism 2 disposed on the opening side of the large diameter cylindrical portion 11 and a small diameter cylindrical portion 12.
It is constructed by combining the second planetary gear mechanism 3 arranged on the side into two stages, and the reduction ratio can be switched to two stages as described later.

An input shaft 5 is connected to the first planetary gear mechanism 2, and the input shaft 5 includes a cylindrical main input shaft 51 and a cylindrical auxiliary input shaft 52 fitted into each other so as to be freely rotatable regardless of the rotation of the other shaft. configured.

The main input shaft 51 is for slow rotation, that is, for large decelerations and large torques, and the auxiliary input shaft 52 is for fast rotations, that is, for small decelerations and small torques.

A square engagement hole 53 for engaging a rotating tool 9 such as a torque wrench is formed at the outer end of the main input shaft 51, and a polygonal shaft hole 54 is formed at the inner end. 1 A protruding polygonal shaft 22 is fitted into the center of the sun gear 21 of the planetary gear mechanism 2.

The planetary gear 23 of the first planetary gear mechanism 2 includes the sun gear 21 and internal teeth 2 formed on the inner surface of the case 1.
0 and supports the pivot shaft 24 of the planetary gear 23, the annular carrier 25 has internal teeth 26, and the internal teeth 26 mesh with the tip of the sun gear 31 of the second planetary gear mechanism 3. .

The planetary gear 32 of the second planetary gear mechanism 3 meshes with the sun gear 31 and an internal gear 30 formed on the inner surface of the case 1, and the carrier 34 supporting the pivot 33 of the planetary gear 32 is integrated with the output shaft 4. is formed.

The tip of the output shaft 4 becomes a square shaft part 41, which projects from the case 1, and into which a socket 7 for engaging a nut 84 is removably fitted.

A ring-shaped knob 5 is attached to the outer end of the auxiliary input shaft 52.
5 is fixed, and a main input shaft 51 is fixed to the end surface of the knob 55.
An engagement hole 56 having the same shape as the engagement hole 53 is provided.

A flange 57 that supports one end of the pivot shaft 24 of the first planetary gear mechanism 2 is connected and fixed to the inner end of the auxiliary input shaft 52, and the flange 57 is rotatably supported by the case 1.

When the main input shaft 51 is rotated, the sun gear 21 of the first planetary gear mechanism 2, the planet gear 23, and the flange 5
7, the sun gear 31 of the second planetary gear mechanism 3, the planetary gears 32, and the output shaft 4. The speed is reduced by steps.

Furthermore, when the auxiliary input shaft 52 is rotated, the rotational force is transmitted to the sun gear 31 of the second planetary gear mechanism 3 through the flange 57 and the carrier 25 of the first planetary gear mechanism 2 without being decelerated. Therefore, when the auxiliary input shaft 52 is rotated, the one-stage deceleration rotation by the second planetary gear mechanism 3 is transmitted to the output shaft 4, and in this case, the output torque is smaller than in the case of the two-stage deceleration, but faster rotation is possible. It is.

A reaction force receiver 6, which is a feature of the present invention, is integrally protruded from the small diameter cylindrical portion 12 of the case 1.

The reaction force receiver 6 includes an arm 61 extending obliquely to the axis of the small diameter cylindrical portion 12 and a fitting part 62 provided at the tip of the arm 61 to protrude outward perpendicular to the axis. It is formed.

A hole 65 into which a bolt 83 and a nut 84 are fitted is formed in the fitting part, and the deep hole part 63 into which the nut 84 is fitted is formed on the side far from the case 1, and the nut 84 is fitted on the side near the case 1. They are formed by penetrating each other with shallow holes 64 into which bolts 83 protruding from the holes are fitted.

The hole 65 is formed into an elongated hole extending outward.

Further, the reaction force receiver 6 is entirely curved in an arc shape in either the tightening rotation direction or the loosening rotation direction.

To tighten the bolts 83 and nuts 84 for fixing the tire 8, the nuts 84 are screwed onto each bolt 83 by hand.

Next, fit the socket 7 connected to the output shaft 4 of the power wrench into an arbitrary nut 84, and tighten the nut 84.
The fitting part 62 of the reaction force receiver 6 into the nut 84 near the
Insert.

Hold the power wrench lightly with one hand, turn the knob 55 with the other hand to rotate the auxiliary input shaft 52, perform one-step deceleration by the second planetary gear mechanism 3 as described above, and then rotate the output shaft. Rotate 4 and nut 84
Tighten. Since there is only one stage reduction, it can be tightened quickly.

If the tightening resistance becomes so large that it cannot be turned by hand,
Fit the rotary tool 9 into the engagement hole 53 of the main input shaft 51, rotate the shaft, and tighten the nut 84 with large torque due to the two-stage reduction by the first planetary gear mechanism 2 and the second planetary gear mechanism 3 as described above. .

During the above operation, the reaction force receiver 6 is engaged with another nut 84, and the entire power wrench does not rotate.

The above operation can be repeated as many times as there are nuts 84.

To loosen the nut 84, operate the power wrench in the reverse order to the above.

Note that when turning the auxiliary input shaft 52, the knob 55 of the shaft
For example, if the threads of a bolt or nut are damaged, it would be difficult to turn the auxiliary input shaft 52 directly by hand. Even if the input shafts 52 and 5 exceed the rotation angle, the auxiliary input shafts 52 and 5 can be rotated easily and quickly.

As described above, the power wrench of the present invention is used by engaging two nuts 84, the nut 84 to be tightened and the nut near the nut 84, so even if you take your hand off the power wrench, the wrench will continue to tighten. Maintain a horizontal position. Therefore, when rotating the input shaft 5 of the power wrench, the wrench can be lightly supported with one hand and rotated with the other hand, and unlike conventional methods, supporting the wrench does not require much force and is easy to handle. It's easy.

Moreover, since the reaction force receiver 6 is curved in one direction as a whole, even if the bearing part 82 protrudes from the center like the hub drum 81, the arm 61 of the reaction force receiver 6
does not hit the bearing portion 82, and there is no problem in use.

Furthermore, there is a hole 65 into which the nut 84 of the reaction force receiver 6 is fitted.
Since the hole is an elongated hole, it can be engaged even if the arrangement pitch of the nut 84 is different depending on the size of the tire 8, and it is versatile.

Generally, the larger the tire 8, the larger the nut 84 for mounting the tire 8, and the arrangement pitch of the nut 84 differs depending on the type of tire. The holes are formed in such a way that various arrangement pitches and nuts can fit into them, so even if the tires 8 are of different sizes, the holes in the reaction force receiver 6 can be placed in a state with less rattling.
4 can be fitted.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and various modifications can be made within the scope of the claims of the utility model registration.

[Brief explanation of the drawing]

Figure 1 is a slope view of the power wrench and tire 8;
FIG. 2 is a sectional view of the power wrench, FIG. 3 is a sectional view taken along the line in FIG. 2, FIG. 4 is a front view of the knob 55, and FIG. 5 is a front view showing the state of use. 1... Case, 2... First planetary gear mechanism, 3...
...Second planetary gear mechanism, 4...Output shaft, 6...Reaction force receiver.

Claims (1)

[Scope of utility model registration request] An input shaft 5 is made to protrude from one end of the case 1, and an output shaft 4 is made to protrude from the other end of the case 1, and a deceleration/power-up mechanism that connects both shafts is interposed inside the case 1. Case 1
In a power wrench with a protruding reaction force receiver 6 for preventing rotation of the power wrench, the reaction force receiver 6 has a fitting part 62 with a hole into which a protruding object is fitted, and an arm connecting the fitting part 62 to the case 1. 61, and a fitting part 62
The power wrench for attaching and detaching a tire is characterized in that the hole 65 is formed as an elongated hole, and the reaction force receiver 6 is curved in an arc shape as a whole in either the tightening direction or the loosening direction.