JPH064227B2 - Bearing preload automatic adjustment tool - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing preload adjusting tool, and more particularly to an automatic adjustment of an axle rotation weight of an automobile underbody component, for example, a tapered roller bearing of an axle hub disk. The present invention relates to a bearing preload automatic adjusting tool which is suitable for performing the automatic operation.

[Conventional technology]

Conventionally, for example, a bare rig preload adjusting tool in which an impact wrench and a preset type torque wrench are integrated has been developed as disclosed in Japanese Patent Laid-Open No. 59-129672. That is, this is what is shown in FIG. This works as follows.

First, hold the torque wrench 100 in one hand and the impact wrench 200 in the other hand, fit the socket box 300 into a nut (hereinafter, referred to as setting nut) as a setting member on the work side, and then the head of the socket box. The connecting portion 11 of the torque wrench 100 is inserted into and the first main shaft 102 is connected. In the temporary tightening work of the setting nut, the switching lever 103 is set to the neutral position. In this neutral position,
The two engaging pawls are held in a disengaged state away from the ratchet 104 of the first main shaft 102, and the first main shaft 102 is in a free state. In this state, the impact wrench 2
When 00 is pushed in the direction of the first spindle 102, the second spindle 1
05 is pushed against the elastic force of the spring 106,
Both the clutches 107 and 108 are engaged so that the first main shaft 10
Directly connected to 2. Then, pull the rotary knob (not shown) of the impact wrench 200 to supply air to drive the drive shaft 20.
1 is rotationally driven to rotate the first main shaft 102 to temporarily tighten the setting nut. Next, impact wrench 2
When the pressing force of 00 is released, the second main spindle 105 moves to the sprig 1
It is separated from the first main shaft 102 by the restoring force of 06, and the connection of both shafts is released. In this state, the switching lever 1
03 is switched from the neutral position to the first position where the first main shaft 102 is rotated in the loosening direction of the setting nut. As a result, the cam 110 rotates and the engagement is normally engaged with the ratchet 104, and the first spindle 1 is only in the direction in which the setting nut is loosened.
02 and handle lever 111 are integrated,
The restricting piece 112 is interposed in front of the flange portion of the second main shaft 105 to restrict the second main shaft 105 from moving in the axial direction. Then, the handle lever 111 is operated to loosen the setting nut. Then, the switching lever 10
3 is switched to a second position in which the first main shaft 102 is rotated in the final tightening direction of the setting nut beyond the neutral position, the cam 110 is rotated, and one of the engaging claws and the ratchet 104 are engaged to set. The first main shaft 102 and the handle lever 111 are integrated only in the direction in which the main nut is fully tightened, and the restriction piece 112 is interposed in front of the flange portion of the second main shaft 105 so that the second main shaft 105 moves in the axial direction. Regulate to prevent movement. Before this work, handle lever 111
Set the tightening torque of the setting nut in the tightening torque setting mechanism provided inside. Then, operate the handle lever to perform the final tightening work of the setting nut.

In such a conventional bearing preload adjusting tool, the preset type torque runner for adjusting the bearing preload guarantees the lower limit of tightening torque due to its structure, but over torque due to manual work speed and common mistakes due to manual work. When tightened with, it becomes overpreload,
This will cause seizure in the bearing.

In addition, the conventional bearing preload adjusting tool has a drawback that the quality tends to vary due to a work method involving human intervention.

Furthermore, the conventional bearing preload adjustment tool is a skillful work from the recent multi-skilled labor system because it requires work and human tips, so it is not something that anyone can do, especially assembling / When operating with a constant line tact on the conveyor, there is a problem that a line stop occurs due to work delay.

[Object of the Invention]

An object of the present invention is to perform temporary tightening, loosening, and final tightening of a bearing automatically, and to perform temporary tightening with a constant force at all times to obtain a stable return torque and stabilize quality. It is to provide a bearing preload automatic adjustment tool capable of achieving the above.

[Means for solving problems]

The present invention has a first main shaft fitted to a one-way clutch through a case having a socket that fits a bare rig nut of a workpiece at one end, and a 1/4 rotation reverse rotation dog,
A second main shaft having one end fitted to the other end of the first main shaft and the other end formed into a gear, and coaxially fitted to the other end of the second main shaft to transmit a hydraulic pulse to a predetermined first rotation. The first torque control impact, which is converted into torque and transmitted to the second main shaft, and the second torque via the gear at the other end of the second main shaft and the intermediate gear
A second torque control impact that is fitted to a gear that meshes in parallel with the main shaft, converts a hydraulic pulse into a predetermined rotational torque value different from the first torque control impact, and transmits the value to the second main shaft; The first spindle is rotated by the torque control impact until it reaches a predetermined first rotation torque, and then is reversely rotated about 1/4 rotation, and then the second spindle is rotated by the second torque control impact to the second spindle. And a control means for controlling the rotation until the rotation torque reaches a predetermined rotation torque.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention.

In the figure, the first spindle 9 in which the socket 300 is fitted
A second main shaft 640 is fitted to 00. The second main shaft 640 is directly connected to the gear 610 inside the gear case 600. A socket 51 having a torque control impact of 500 (400 to 600 kg · cm) is fitted on the gear 610. Further, the gear 610 has an intermediate gear 6
The gear 630 meshes with the gear 20. This gear 6
30 torque control impact (100 kg / c
m) 550 is fitted. The torque control impact 500 is for temporary tightening, and the torque control impact 550 is for final tightening. The torque for temporary tightening is higher than the torque for final tightening because the bearing of the work is forcibly press-fitted to the end by temporary tightening, and the bearing is rotated by 1/4 turn before loosening to loosen the bearing. Since this eliminates the load, the required tightening torque is 100 kg
This is because cm is sufficient.

In addition, the main shaft 900 has a one-way clutch 800
A quarter-reverse dog 710 housed in a quarter-reverse dog case 700 is provided. Further, the air supply pipe 501 of the torque control impact 500 and the air supply pipe 551 of the torque control impact 550 are configured to be supplied with the normal rotation air and the reverse rotation air supplied from the valve lever 400. .

The torque control impacts 500 and 550 have the structure shown in FIG. That is, the torque control impacts 500 and 550 are provided in the main body 10, a switching valve provided after a main valve (not shown) for switching between forward and reverse rotation of the pneumatic wrench, the air motor 40 that is supplied with high-pressure air to rotate, and the air motor. A hydraulic pulse generator 50 that is directly connected to rotate the socket, a shaft-off valve 60 that is provided in the middle of the air supply circuit from the switching valve to the air motor 40 to shut off the air supply, and a shut-off valve that is attached to the shut-off valve 60. A detection valve 70 that operates the valve 60, a pressure sensor 80 that senses a constant hydraulic pressure from the hydraulic pulse generator 50, and a pressure sensor 8 that is interposed between the pressure sensor 80 and the detection valve 70.
Push rod 90 for transmitting 0 movement to the detection valve 70
It consists of and.

The high-pressure air is supplied to the air motor 40 in the main body 10 through the main valve, the switching valve 30, and the shutoff valve 60, and the main valve starts or stops the supply. The rotational force of the air motor 40 is converted into the rotational force of the socket 51 by the hydraulic pulse generator 50 that intermittently generates a predetermined torque sealed in the main body 10.

FIG. 3 shows a torque generating mechanism in the state where the hydraulic pulse generator 50 is in one cycle. In the state before the pulse, I indicates that the liner 52 rotates in the direction of the arrow, the contact A on the inner surface of the liner 52 approaches the fine point B of the spindle 53, and the contact C approaches the outer edge D of the driving plate 54. However, the volume inside the liner 52 on the right side of the main shaft 53 gradually decreases, and the volumes on the left and right increase conversely. Therefore, the oil pressure increases on the right side of the main shaft 53 and decreases on the left side, so that the oil flows from the right side to the left side through the recess 55 on the inner surface of the liner 52. In II, when the liner 52 further rotates and the contacts A, C are in full contact with B, D, the oil flow suddenly stops at this time, and the oil pressure on the right side of the main shaft 53 momentarily rises (pulse). Then, a large force is applied to the right side surface of the driving plate 54 to generate a rotational force (torque) on the main shaft 5. III shows a state in which the liner 52 further rotates after the pulse and the contact points are exceeded. The oil freely flows around the main shaft 53, accelerates by the force of the air motor 40, and again passes through I to the state of II. By repeating the above-described operation, pulsed torque of the main shaft 53 is applied to rotate the socket 51.

The oil pressure at the time of the pulse is very high, and therefore a large torque is also generated in the main shaft 53, but on the other hand, its activation is also large. Therefore, it is necessary to release the oil on the high pressure side to the low pressure side at the moment of pulse generation so as to reduce this recoil and move smoothly to the next operation. For this reason, a hole is formed in the thick portion of the liner 52 in the axial direction, a valve 57 made of a steel ball or the like is placed between it and a small hole 56 communicating from the high pressure side to the low pressure side, and oil from the high pressure side to the low pressure side of the liner portion is placed. By adjusting the distance between the valve 57 and the valve seat 59,
It can be adjusted, and the torque can be adjusted.

The pressure oil generated in the pulse section is guided to the pressure sensor 80 through a passage (not shown). The pressure sensor 80 comprises a piston 83 slidably fitted in a hole 81 formed in the upper lid 82 of the liner, senses the generated pressure oil pressure, and pushes the push rod 90 toward the detection valve 70. .

The push rod 90 is inserted through a hole 41 provided through the axial center of the rotor 40, and one end thereof has a pressure sensor 80.
Further, the other end is in contact with the detection alve 70.

The detection valve 70 uses a spring 71 to push the push rod 90.
The packing material 72, which is biased to the side and is held by the detection valve 70, opens and closes by being seated on or separated from the valve seat 73. The detection valve 70 connects or cuts off the bypass passage 74 from the switching valve and the passage 75 to the control valve.

The one-way clutch portion shown in FIG. 1 has a structure as shown in FIG. That is, the one-way clutch 800 is provided on the main shaft 900, and the main shaft 900 is fitted in the 114 reverse rotation dog case 700. The 1/4 reverse dog 710 is fitted in the 1/4 reverse dog case 700. This spindle 900, 1/4
FIG. 5 shows a state in which the reverse rotation dog 710, the 1/4 reverse rotation dog case 700, and the one-way clutch 800 are set. This one-way clutch 800, 1 /
4 In combination with the reverse rotation dog 710, the main shaft 90
Although 0 rotates freely, the reverse rotation direction is regulated so as to rotate only 90 °. In FIG. 5 (B), when the spindle 900 starts reverse rotation, the 1/4 reverse rotation dog 710 causes the one-way clutch 800 to rotate the spindle 900.
Turn in the same direction (reverse direction).

Next, the reversed 1/4 reverse dog 710 hits the 1/4 reverse dog case 700 as shown in FIG. 5 (C), and the reverse rotation is restricted. (About 90 °). At this time, the torque control impact (500, 550) is hit. When the main shaft 900 rotates in the forward direction, the 1/4 reverse rotation dog 710
Becomes free in the forward direction and returns to its original position by the return spring. The 1/4 reversing dog 710 allows the loosening after the full tightening.

FIG. 6 shows the positional relationship between this embodiment and the work. In the figure, the preload adjusting tool main body 1000 according to the present embodiment is suspended by a lock type balancer 1200, and an operation box 1500 is provided on a base for fixing the main body 1000. A slide cylinder 1100 is provided on this base, and this slide cylinder 11
00 is pressed in one direction by the air cylinder 1150. The preload adjusting tool main body 1000 clamps a work 1400, and the work 1400 is placed on the assembly conveyor 1600. This work 1
A socket 1050 for tightening a nut of a workpiece for producing a preload of 400 is attached to the preload adjusting tool main body 1000. In addition, 1250 is a pressure plate, 1
3000 is a display box.

Since it is configured in this way, the assembly conveyor 1
When automatically adjusting the bearing preload of the suspension parts flowing above 600, the valve lever 400 is turned on. Then, first, torque control impact 50
Depending on 0, temporarily tighten the nut of the work 1400 in the bearing main axis direction until the torque of the work 1400 is increased by 400 to 600 kg · cm. Next, when the temporary tightening is completed, the one-way clutch mechanism and the mechanism in the 1/4 reverse rotation dog case 700 having the 1/4 reverse rotation dog 710 capable of 90 ° slack rotation (return) allow the temporary tightening torque control impact 5 to be achieved.
When the air valve is switched to 00, a reverse return (loosening) force is applied to reverse the socket 300 and the workpiece 1
Loosen the 400 nuts. In this case, the final tightening torque control impact 550 is idling through the intermediate gear 620. Next, an air pressure signal is applied to the final tightening torque control impact, and a small torque controller 550 with a rotation weight suitable for bearing preload of about 70 to 150 kg · cm is inserted into the socket 300 via the intermediate gear 620. Apply tightening torque to complete.

After that, the lock type balancer 1200 is released, and a rising force is applied to the preload adjusting tool main body 1000 by the force of the spring, and at the same time, the preload adjusting tool main body 1000 can be removed from the work 1000 by the air cylinder 1150. All of these work sequences are controlled by a sequencer in a control box (not shown).

〔The invention's effect〕

As described above, according to the present invention, it is possible to uniformly adjust the preload without depending on the feeling and the knack of the work of the operator in the past.

Further, according to the present invention, it is possible to measure the low number of mouths because no human is required and all the processes are automated.

Further, according to the present invention, since it is automatically performed, the quality of preload adjustment can be stabilized.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a detailed view of a torque control impact shown in FIG. 1, and FIG. 3 is a sectional view showing a working state of a hydraulic pulse generator of the impact shown in FIG. 4, FIG. 4 is an assembly configuration diagram of the one-way clutch portion, FIG. 5 is a diagram for explaining the operation of the reverse rotation dog, FIG. 6 is a diagram showing the positional relationship between the embodiment shown in FIG. 1 and the work, and FIG. The figure shows a conventional torque wrench. 300 ... Socket, 400 ... Valve lever, 500, 5
50 ... Torque control impact, 600 ... Gear case, 700 ... 1/4 reverse rotation dog case, 710 ... 1 /
4 Reverse rotation dog, 800 ... One way clutch, 900 ...
First spindle.

Claims (1)

[Claims] 1. A first main shaft fitted in a one-way clutch through a case having a socket for fitting a bare rig nut of a work at one end thereof, and a 1/4 rotation reverse rotation dog, and one end of the first spindle. A second main shaft fitted to the other end of the main shaft and the other end of which is formed into a gear, and coaxially fitted to the other end of the second main shaft to convert a hydraulic pulse into a predetermined first rotational torque. And a first torque control impact transmitted to the second main shaft, and a gear that meshes in parallel with the second main shaft through a gear at the other end of the second main shaft and an intermediate gear, and is fitted to the second main shaft to transmit a hydraulic pulse. A second torque control impact that is converted into a predetermined rotational torque value different from the first torque control impact and transmitted to the second spindle, and the first torque control impact causes the first spindle to move to the predetermined first torque control impact. Rotation of After rotating until reaching Ruku, the control means controls so as to reversely rotate about 1/4 rotation and then rotate the first main spindle by the second torque control impact until reaching the second predetermined rotation torque. An automatic adjustment tool for a bearing prode characterized by having and.