JPS6153194B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt tightening device for tightening an adjusting bolt of a brake booster used in combination with a hydraulic brake of an automobile, for example.

2. Description of the Related Art In general, a brake booster for automobiles having a structure as shown in FIG. 1 is known as an example. That is, it is installed between the brake pedal 1 and the master cylinder 2, and the brake pedal 1
The force applied to the diaphragm 6 in the power cylinder 5 and the pressure difference between the vacuum in the vacuum chamber 8 on both sides of the power cylinder piston 7 and the atmospheric pressure in the atmospheric pressure chamber 9 is doubled through the input rod 3 and the valve part 4. A force is transmitted to the output rod 10, and a force is applied directly to the master cylinder piston 12 in the master cylinder 2 through the adjusting bolt 11 screwed into the output rod 10, and the master cylinder piston 12 is moved. The reaction force of the master cylinder piston 12 is transmitted to the brake pedal 1 via the adjusting bolt 11, the output rod 10, the reaction force mechanism 13, and the input rod 3. However, in the case of such a brake booster, since there is no suitable device for screwing and tightening the adjusting bolt 11 into the output rod 10, this tightening work has heretofore been performed each time by hand. That is, one output rod 1
0 is provided with a normal metric threaded hole, and the other adjusting bolt 11 is provided with a thicker thread (the pitch is the same) with more thread than a normal metric thread. When screwing into the output rod 10, tighten the adjusting bolt 11 with a torque wrench and measure the tightening torque, and also measure the dimension from the spacer 14 provided on the booster body to the tip of the adjusting bolt 11. Screws are being tightened one by one.
This is because in the case of the brake booster, the force is directly transmitted to the master cylinder piston 12 by the adjusting bolt 11.
When the master cylinder 2 is assembled to the power cylinder 5, the tip of the adjusting bolt 11 is brought into contact with the adjusting bolt receiving portion 12a of the master cylinder piston 12 in just the right amount, that is, with a degree of freedom O. This is because it is necessary to prevent rattling in the parts in order to perform a smooth and efficient braking operation. Therefore, the tip of the adjuster staying bolt 11 screwed into the output rod 10 must always be located at the correct position, and a problem also occurs if the adjuster staying bolt 11 becomes loose. Therefore, it is necessary to tighten the adjusting bolt 11 to the output rod 10 with a predetermined tightening torque. but,
Manually tightening the adjusting bolt 11 as described above is time-consuming and may damage the screw hole of the output rod 10 if it is overtightened, or the dimension between the tip of the adjusting bolt 11 and the spacer 14 may be shorter than the specified dimension. This has resulted in the drawback that it is not possible to manufacture a booster that can perform a smooth and efficient braking operation.

This invention was made in view of the above circumstances,
By providing a tightening tool connected to a motor, a torque measuring device, and a frame movement distance indicating device on a frame that moves in the direction of the central axis of the main body supported on a support stand, bolts can be attached to the main body with a predetermined torque. It is an object of the present invention to provide a bolt tightening device that can position and tighten the tip of a bolt at a predetermined correct position.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 6. 21 in the figure is a base, and this base 21 is provided with a support base 22. This support stand 22 is a fixed stand 2 arranged facing away from each other.
A stepped cylindrical pedestal 22c is provided on each of the pedestals 2a and 22a via a ball bearing 22b, and a pedestal 22d is provided above the pedestal 22c. A booster body 23 having a spacer 23a on one side is placed on this seat 22d with the end face of its front shell 23b. This booster main body 23 has a fourth section in its center.
As shown in the drawings and FIG. 5, the output rod 24 is provided with a knurled portion 24a. This output rod 24 is provided with a threaded hole made of a normal metric thread, and this threaded hole has a thicker threaded portion with more thread than a normal metric thread. is screwed in. An engaging portion 25 having a hexagonal cross section is provided approximately in the center of the entire length of the adjusting bolt 25. and,
A frame 26 for setting the pedestal 22c in a predetermined position is provided around the booster main body 23, and a flange is fitted onto the upper part of the frame 26 by fitting into a set pin 26a provided on the frame 26. A cylindrical anti-rotation plate 26b is detachably provided. A serration hole is provided in the lower part of the rotation prevention plate 26b, and the serration hole is fitted into the knurled portion 24a of the output rod 24 to prevent the output rod 24 from rotating. Note that a through hole is provided in a portion of the detent plate 26b that faces a terminal 43, which will be described later. Above the support stand 22, a frame 27,
27 are arranged above and below, and these frames 27, 27
Guide pillars 28, 28 are provided at. A frame body 29 is fitted into these guide columns 28, 28 via bushes, and is connected to a cylinder mechanism 30 provided on the frame 27 so as to be vertically movable. Further, the frame body 29 is provided with an adjusting bolt tightening tool 31, and a torque converter 32 and a motor 33 are connected to the adjusting bolt tightening tool 31. A socket 34 is provided at the tip of the adjusting bolt fastener 31, and a recessed portion having a hexagonal or dodecagonal cross section that fits into the engaging portion 25a of the adjusting bolt 25 is provided at the lower end of the socket 34. It is being Further, the frame body 29 is provided with bearings 35, 35, and the guide bars 36, 36 are mounted on the bearings 35, 35.
is inserted so that it can move up and down. Further, lock nuts 37, 37 are fixed to positions slightly above the bearings 35, 35 of the guide bars 36, 36, and the upper ends of the guide bars 36, 36 are connected by an upper plate 38, and furthermore, this upper plate 38 There is a bracket 39
is provided, and this bracket 39 is provided with a displacement meter 40.
or installed. In addition, the guide bar 36,
The lower end portions of the guide bars 36 are connected by a lower plate 41, and springs 42, 42 are provided between the lower plate 41 and the frame 29 so as to fit into the guide bars 36, 36. A hole is made in the center of the lower plate 41, and terminals 43, 43 having hemispherical tips are provided in this 41. Further, the frame body 29 is provided with a bracket 44, and this bracket 44 is provided with a cylinder mechanism 45. One end of a connecting plate 46 is attached to the cylinder mechanism 45, and a detection rod 47 is fixed to the other end of the connecting plate 46, passing through the connecting plate 46. Incidentally, a hollow portion is provided in the torque converter 32, the adjusting bolt fastener 31, and the socket 34 on an extension of the central axis of the adjusting bolt 25, and the detection rod 47 is inserted into the hollow portion. The detection rod 47 is inserted so as to be able to move up and down with a clearance, and the lower end of the displacement gauge 40 is brought into contact with the upper end of the detection rod 47, and the detection rod 47 is constantly pushed upward by a return spring to prevent contact with the displacement gauge 40. is guaranteed. Further, a marking device 48 is provided on the fixed base 22a so as to face the outer peripheral surface of the booster main body 23. Note that a vacuum tank 51 is provided at the bottom of the base 21.
A vacuum pump 52 connected to the vacuum tank is provided. The booster body 23 is connected to the vacuum pump 52 via a pressure control valve 53. Further, 54 is a control panel, 55 is a torque display control amplifier, 56 is a dimension display judgment amplifier, 57 is a manual operation panel, and 58 is an automatic operation panel. A torque control circuit 59 is connected to the torque converter 32, and a displacement detection and determination circuit 60 is connected to the displacement meter 40.

Therefore, when screwing and tightening the adjusting bolt 25 into the output rod 24,
First, when the cylinder mechanism 30 is lowered, the frame 29
moves downward. As the frame body 29 moves downward, the guide bars 36, 36 descend together with the displacement meter 40. Therefore, the terminals 43, 43 are passed through the holes of the rotation prevention plate 26b and brought into contact with the surface of the spacer 23a. Next, when the adjusting bolt fastener 31 is inched (that is, turned little by little), the socket 34 is fitted into the engaging portion 25a of the adjusting bolt 25. Next, the piston rod of the cylinder mechanism 45 is lowered to bring the lower end of the detection rod 47 into contact with the tip end surface of the adjusting bolt 25. As a result, the spacer 2 is measured by the displacement meter 40.
The dimension from the surface of 3a to the tip of the adjusting bolt 25 is measured, and this dimension is displayed on the dimension display judgment amplifier 56. Next, when the motor 33 is operated, the adjusting bolt tightening tool 31
rotates, and the adjusting bolt 25 is screwed into the output rod 24. At this time, the detection rod 47 also descends with its lower end in contact with the tip of the adjusting bolt 25. As a result, when the dimension from the spacer 23a to the tip of the adjusting bolt 25 reaches a predetermined value, the displacement meter 40 detects this via the detection rod 47, and the controlling device in the control panel 54 tightens the adjusting bolt. The attachment 31 stops rotating. In addition, while the adjusting bolt 25 is screwed in, the torque converter 32 measures the tightening torque of the adjusting bolt 25, and when this tightening torque exceeds a predetermined tightening torque, the torque converter 32 measures the tightening torque of the adjusting bolt 25. The rotation of the adjusting bolt fastener 31 is stopped. Then, when the dimension from the surface of the spacer 23a to the tip of the adjusting bolt 25 and the tightening torque are within a predetermined tolerance range, the marking device is activated.
As a result, a mark is placed on the outer peripheral surface of the booster main body 23. Therefore, if the adjusting bolt fastener 31 stops and no mark is placed, there is a problem with the tightening torque, the tightening dimensions, or the assembly, and all of these are caused by the torque display control amplifier 5.
5 or displayed by the dimension display judgment amplifier. Although the above-described operations are performed automatically, the same operations as described above can also be performed manually.

In addition, in the above embodiment, the booster main body 2
Although the adjusting bolt 25 is screwed into the output rod 24 of No. 3 and tightened, the present invention is not limited to this, and the present invention can also be applied to the case where a normal bolt is screwed into another bolted body and tightened. I can do it.

As explained above, according to the present invention, a frame body that moves in the central axis direction of a main body supported on a support base includes a fastener connected to a motor, a torque measuring device, and a bolt side surface of the main body and a tip of the bolt. Since the structure is equipped with a mechanism that measures and indicates the distance between Since the applied torque can be measured, it is possible to tighten the bolt to the main body with a predetermined torque and with the tip of the bolt positioned in the correct predetermined position. When this invention is used, for example, in a brake booster, it can be tightened smoothly. A brake booster that can perform efficient braking operations can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional view of a conventional brake booster, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a schematic explanatory view of the mechanism, FIGS. 4 and 5 are enlarged detailed views of the circular portion of FIG. 3, and FIG. 6 is a functional explanatory view showing one embodiment of the present invention. 22...Support stand, 23...Booster main body, 24
...output rod, 25...adjustment bolt, 29...frame body, 31...adjustment bolt tightening tool, 32...torque converter, 3
3... Motor, 36... Guide bar, 40... Displacement meter, 43... Terminal, 47... Detection rod, 56
...Dimension display judgment amplifier.

Claims (1)

[Scope of Claims] 1. A support stand that supports a main body into which a bolt is screwed, a frame provided opposite to the support stand and movable in the direction of the center axis of the main body, and a bolt fastener provided, a motor connected to the bolt fastener, a torque transducer interposed between the motor and the bolt fastener, and a bolt side surface of the main body and the bolt 1. A bolt tightening device comprising: a mechanism for measuring and instructing a distance to a tip; the bolt tightening device tightening the bolt to the main body; 2. The mechanism for measuring and indicating the distance between the bolt side surface of the main body and the tip of the bolt includes a guide bar provided on the frame so as to be movable up and down, a displacement meter attached to the guide bar, and a displacement meter attached to the guide bar. a dimensional display judgment amplifier connected to the displacement meter, a terminal connected to the guide bar, and a detection rod inserted into the bolt fastener and having its upper end abutted against the displacement meter and capable of vertical movement. A bolt tightening device according to claim 1, characterized in that it comprises: