JPH0453869Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a preload adjustment device that can tighten screw members and measure preload for multiple types of workpieces with different specifications such as dimensions and shapes. This invention relates to a preload adjustment device.

(Prior Art) As shown in FIG. 6, for example, in a differential gear for an automobile, a drive pinion shaft B is connected to a differential carrier A, and a pair of tapered roller bearings C,
When supporting rotatably through the tapered roller bearings C, the tapered roller bearings C and C are provided with the support so as to prevent rattling of the tapered roller bearings C and so that the drive pinion shaft B rotates smoothly with resistance below a predetermined torque. Appropriate preload is applied, and an example of a device used for this purpose is disclosed in Japanese Patent Publication No. 52-31592.

As shown in FIG. 6, this device engages with a companion flange D that is spline-fitted to the drive pinion shaft B.
It has a first rotational drive member E that rotationally drives the drive pinion shaft B via the drive pinion shaft B, and a second rotational drive member G that rotationally drives the nut F that is screwed into the threaded portion at the tip of the drive pinion shaft B. First, by rotating the nut F by the second rotary drive member G at a speed greater than the rotation speed of the drive pinion shaft B by the first rotary drive member E, the nut F is attached to the threaded portion of the drive pinion shaft B. By pushing and tightening the companion flange D, and reducing the tightening speed of the nut F by the second rotary drive member G in accordance with the increase in the rotational resistance (preload) of the drive pinion shaft B due to the tightening, The preload is set to an appropriate value.

(Problem to be solved by the invention) By the way, in this type of preload adjustment device, while the rotation of the shaft member is restricted in order to tighten the nut as described above, it is also possible to control the rotation of the shaft member by rotating the shaft member. In order to measure preload from rotational resistance, a member that engages with the shaft member is required, and in the above conventional example, this member is a first rotational drive member E that engages with the companion flange D and rotationally drives it. is provided. However, with such a configuration, specifications such as the shape and dimensions of the companion flange D differ depending on the model, so
When targeting multiple types of work, the above first
Either prepare multiple dedicated devices equipped with rotary drive members E that correspond to each companion flange, or select a first rotary drive member E that corresponds to companion flanges of each specification in one device. However, in the former case, the equipment cost will be significantly high, and in the latter case, troublesome setup work will be required every time the specifications of the workpiece are changed.

Therefore, the present invention is a preload adjustment device of this type that can be used with a single device that does not require troublesome setup changes or significantly complicates the structure, and can accommodate different specifications such as dimensions and shapes of companion flanges. It is an object of the present invention to provide a preload adjustment device that can be used for multiple types of workpieces.

(Means for Solving the Problems) That is, the preload adjusting device according to the present invention includes a first rotational drive that tightens a screw member to a shaft member rotatably supported via a bearing to apply a preload to the bearing. and a second rotary drive means for rotating the shaft member to measure the preload, a swing base member that is swingable about the axis of the second rotation drive means, and a swing base member that is swingable about the axis of the second rotation drive means; A plurality of rotational engagement members are supported by a base member and selectively positioned on the axis of the first rotational drive means by swinging of the members. One of the rotational engagement members positioned on the axis of the first rotational drive means engages with the shaft member, and when the first rotational drive means tightens the screw member, the shaft member is rotated. The shaft member is fixed, and at the time of preload measurement by the second rotational drive means, is rotationally driven by the second rotational drive means via a clutch to rotate the shaft member.

(Function) According to the above configuration, when the screw member is tightened by the first rotation drive means to the shaft member rotatably supported by a bearing such as a tapered roller bearing, the thread member is attached to the axis of the first rotation drive means. By fixing the shaft member by the rotational engagement member located at
The screw member is reliably tightened without causing rotation of the shaft member, and a preload is applied to the bearing. Further, after the tightening of the screw member is completed, the rotary engaging member is driven by the second rotary driving means via the clutch, and the shaft member engaged with the member is rotated. The preload is measured by detecting rotational resistance of the shaft member.

In particular, a plurality of the rotational engaging members are supported by the swinging base member and are selectively positioned on the axis of the first rotational drive means, that is, at the set position of the shaft member, and the selected one is Since it is designed to be interlocked with the second rotational drive means via a clutch, the size and shape of the engaging portion of the shaft member (for example, the engaging portion of a companion flange spline-fitted to the shaft member), etc. When performing the above-mentioned work on workpieces having different specifications, simply positioning the rotary engagement member corresponding to the next workpiece on the axis of the first rotational drive means by swinging the swinging base member will complete the step. A replacement will be made. In this way, it becomes possible to perform tightening of screw members and measurement of preload for a plurality of workpieces with a single device with only a simple setup change, and the above-mentioned first and second rotation driving means can be Since it is used for each workpiece, although it is a general-purpose machine, it has a relatively simple configuration.

(Example) Examples of the present invention will be described below.

As shown in FIG. 1, the preload adjustment device 1 according to the present embodiment includes a nut tightening runner 4 erected on an upper frame 3 of a machine frame 2 as a main component.
It has a preload measuring runner 5 and a swing base 7 provided below the lower frame 6. As shown in FIG. 2, this swing base 7 is fixed to the lower end of a hollow support shaft 9 that is rotatably fitted and held in a bearing sleeve 8 fixed to the lower frame 6, and swings in a horizontal plane. A drive shaft 10 extending downward from the preload measuring runner 5 is rotatably fitted into the hollow support shaft 9. Therefore, the swing base 7 is adapted to swing around the axis of the preload measuring runner 5. As shown in FIG. 1, a swinging cylinder 12 of a swinging base 7 is attached horizontally to a frame member 11 vertically installed on an upper frame 3, and a piston rod 13 of the cylinder 12 is attached to the hollow support shaft 9. By being connected to an arm member 14 fixed to the upper end of the cylinder 12, the swing base 7 is swung via the hollow support shaft 9 by the operation of the cylinder 12.

On the other hand, as shown in FIG. 2, a rotation transmission shaft 17 that rotates integrally with the drive shaft 15 is connected to the drive shaft 15 extending downward from the nut tightening runner 4 via a relay shaft 16. This rotation transmission shaft 17
The upper part of the support member 1 is attached to the frame member 11.
It is fitted and held in a bearing sleeve 19 which is fixedly installed via pins 8 and 18 so as to be rotatable and movable up and down, and also fitted into the lower part of the relay shaft 16 so as to be slidable up and down. Then, the lifting operation member 21 is engaged with the ring-shaped engagement member 20 that is fitted and fixed to the intermediate portion of the rotation transmission shaft 17, and the operation member 2
1 is connected to a piston rod 23 of a cylinder 22 for raising and lowering the rotation transmission shaft disposed on the upper frame 3, so that the operation of the cylinder 22 moves the rotation transmission shaft 17 to the lower position shown in the figure and the upper position thereof. It is designed to be raised and lowered between positions.

Further, as shown in FIG. 2 and FIGS. 3 and 4, on the lower surface of the swing base 7, a first , second work engagement unit 25
₁ and 25 ₂ are rotatably provided. These units 25 ₁ and 25 ₂ have substantially the same configuration,
In both cases, engagement drums 27 ₁ and 27 ₂ are rotatably supported by the swing base 7 and an auxiliary base 26 fixed below the swing base 7, and a socket fitted into the center of the drums so as to be rotatable and movable up and down. shafts 28 ₁ and 28 ₂ , and a plurality of engagement pins 29 ₁ at predetermined positions on the lower end surfaces of the engagement drums 27 ₁ and 27 ₂ , respectively.
_. . _{29 1 , 29 2 .}

These engagement units 25 ₁ and 25 ₂ have a swing base 7 that swings around the axis of the preload measuring runner 5, so that one side surface is attached to the lower surface of the lower frame 6 as shown in FIGS. 3 and 4. When it comes into contact with the first stopper 31 ₁ fixed at a predetermined position, the first engagement unit 25 ₁ is located directly below the axis of the nut tightening runner 4 or the rotation transmission shaft 17, and as shown in the figure. When the swing base 7 swings from the position in the direction a and the other side comes into contact with the second stopper 31 ₂ ,
The second engagement unit ₂₅₂ is arranged on the axis of the nut tightening runner 4 or the rotation transmission shaft 17, and is located directly below it. Directly below the rotation transmission shaft 17 are first and second engagement units 25 ₁ , 2 .
5. With either of ₂ in position, the rotation transmission shaft 1
7 is lowered from the upper position to the lower position, the lower part of the rotation transmission shaft 17 is spline fitted to the upper part of the socket shaft 28 ₁ or 28 ₂ in the unit, as shown in FIG. The rotation of the tightening runner 4 is caused by a drive shaft 15, a relay shaft 16,
Socket shaft 28 ₁ or 2 via rotation transmission shaft 17
8 ₂ . Further, at the upper end portions of the socket shafts 28 ₁ , 28 ₂ , engaging members 32 ₁ , 32 ₂ project upwardly from the lower mount 6 through an opening 6 a provided in the lower mount 6 . ₁ and 28 ₂ so that they can rotate relative to each other. These engaging members 32 ₁ and 32 ₂ are provided with two notches 32 a and 32 a (see FIG. 4), and the nut tightening runner 4
or the notches 32a, 32a of the engaging member 32 ₁ or 32 ₂ in the engaging unit 25 ₁ or 25 ₂ located directly below the rotation transmission shaft 17, that is, at the nut tightening position.
However, the piston rods 34 of the three cylinders for raising and lowering the socket arranged on the upper frame 3 and the rods 3
The auxiliary rod 36 is connected to the connecting member 3 through the connecting members 35, 35 from the side.
The socket shaft 28 ₁ or 28 ₂ of the engagement unit 25 ₁ or 25 ₂ in the nut tightening position is raised or lowered through the engagement member 32 ₁ or 32 ₂ .

On the other hand, pulleys 37 ₁ , 37 ₂ are fitted and fixed on the circumferential surfaces of the engagement drums 27 ₁ , 27 ₂ , and protrude downward from the swing base 7 of the drive shaft 10 of the preload measuring runner 5 . At the lower _{end of} the
₁ , 39 ₂ and respective corresponding pulleys 37 ₁ , 38 ₁ and 37 ₂ , 38 ₂
Belts 40 ₁ and 40 ₂ are wound between them, respectively.
Then, a pulley 38 ₁ corresponding to the pulley 37 ₁ or 37 ₂ of the engagement drum 27 ₁ or 27 ₂ in the unit 25 ₁ or 25 ₂ which is in the nut tightening position
38 ₂ is coupled to the drive shaft 10 via the electromagnetic clutch 39 ₁ or 39 ₂ , and the nut tightening position is determined by the preload measuring runner 5 via the drive shaft 10 and the belt 40 ₁ or 40 ₂ . The engagement drum 27 ₁ or 27 ₂ located at the position is rotatably driven.

In addition, in the upper part of these engaging drums 27 ₁ and 27 ₂ located between the swing base 7 and the auxiliary base 26, as shown in FIG. Engagement recess 27a ₁ ...27
a ₁ , 27a ₂ . . . 27a ₂ are provided. and,
Guide members 41 ₁ , 41 ₂ are provided on the lower surface of the swing base 7.
The engaging recesses 27a ₁ . . .
27a ₁ , 27a ₂ . . . 27a ₂ , engaging members 42 ₁ , 42 ₂ that are respectively engaged with one of them, and a drum fixing cylinder 43 ₁ that moves these engaging members 42 ₁ , 42 ₂ forward and backward, respectively. 43 ₂ , and these cylinders 43 ₁ , 43 ₂ engage the engaging members 42 ₁ , 42 _{2 .}
are projected, and the engaging recesses 27a ₁ ...27a ₁ , 2
When engaged with any one of 7a ₂ . . . 27a ₂ , the engagement drums 27 ₁ and 27 ₂ are fixed. Here, as shown in FIG.
A sensor 44 for detecting the rotational positions of the engaging recesses _{27a 1 . .} . 27a _{1 ,} 27a _{2 . 1,442 are} provided.

Furthermore, positioning holes 45 1 and 45 _{2 are provided at predetermined positions near the first and second engagement units 25 1 and 25 2 on the swing} base 7, and positioning cylinders are provided in the lower frame 6. A positioning pin 47 (see FIG. 2) is provided which is moved up and down by a pin 46, and when either the first or second engagement unit 25 ₁ or 25 ₂ is in the nut tightening position, the positioning pin 47 (see FIG. 2) By inserting the pin 47 into the alignment hole 45 ₁ or 45 ₂ corresponding to the
The first and second engaging units 25 ₁ and 25 ₂ are aligned with high precision. Also,
The swing base 7 includes first and second engagement units 25.
Pressing pieces 48 ₁ , 48 ₂ are fixed in correspondence with the positions ₁ , 25 ₂ , and a pair of clamp members 50 , 50 are provided on the lower surface of the lower pedestal 6 to be operated by clamp cylinders 49 , 49 , respectively. ing. The first and second engagement units 25 ₁ ,
25 ₂ is in the nut tightening position and aligned with the pin 47, the clamp members 50, 50 are pressed against the pressing pieces 48 ₁ , 48 ₂
One side of the receiving member 5 is fixed to the lower surface of the lower frame 6.
By sandwiching it between 1 and 1, the swing base 7
It is designed to be fixed.

Next, this preload adjustment device 1 is used to adjust the operation when tightening a nut via a companion flange to a drive pinion shaft rotatably supported via a pair of tapered roller bearings in the case of an automobile differential. explain.

First, as shown in FIGS. 2 to 4, the swing base 7
one side of the is in contact with the first stopper 31 ₁ ,
The first engagement unit ₂₅₁ is in the nut tightening position below on the axis of the nut tightening runner 4, and in this state, the pin 47 is engaged with the alignment hole 451 by the alignment cylinder 46, and the pin 47 is engaged with the alignment hole ₄₅₁ for clamping. The clamp members 50, 50 hold the pressing piece 481 between the cylinders 49, ₄₉ and the receiving member 51, and the rotation transmission shaft 17 is connected to the lifting cylinder 22.
It is assumed that the socket shaft 28 1 is spline-fitted to the socket shaft 28 ₁ in the first engagement unit 25 ₁ and that the socket shaft 28 ₁ is lowered by the lifting cylinder 33 via the engagement member 32 ₁ . . At this time, as shown in FIG. 5, a pair of tapered roller bearings 6 are attached to the differential carrier 61.
The socket 30 ₁ at the tip of the socket shaft 28 ₁ engages with a nut 65 that is partially screwed into the threaded portion 64 a at the tip of the drive pinion shaft 64 supported via the drive pinion shaft 63 . The bottom of the engagement drum 27 ₁ of the first engagement unit 25 ₁ is inserted into the bolt holes 66 a . The engagement pins 29 ₁ ...29 ₁ on the end faces engage. Then, as shown in FIG. 4, the drum 27 ₁ is fixed by engaging the engaging member 42 ₁ with the cylinder 43 ₁ in any one of the engaging recesses 27 _{a 1} in the upper part of the engaging drum 27 ₁ . After that, the nut tightening runner 4 is operated. As a result, with the drive pinion shaft 64 fixed via the companion flange 66, the nut 65 is tightened by the runner 4 via the drive shaft 15, relay shaft 16, rotation transmission shaft 17, and socket shaft ₂₈₁ . It will be.

When the nut 65 is thus tightened to the threaded portion 64a of the drive pinion shaft 64 to a predetermined tightening torque, the socket shaft ₂₈ is then tightened by the socket shaft lifting cylinder 33 via the engaging member 321. ₁ , the socket 30 ₁ is released from the nut 65, and the engagement member 42 ₁ is removed by the drum fixing cylinder 43 ₁ .
the engagement recess 27a ₁ of the engagement drum 27 ₁
At the same time, the pulley _{38 1} corresponding to the first engagement unit 25 1 at the lower end of the drive shaft 10 of the preload measurement runner 5 is connected to the electromagnetic clutch 39
₁ to the drive shaft 10. If the preload measuring runner 5 is operated in this state, the drive shaft 10, pulley 38 ₁ , belt 4
0 ₁ and the pulley 37 ₁ , the pins _{29 1 ...} 29 ₁ of the drum 27 ₁ are rotated through the companion flanges 66 engaged with the bolt holes 66a...66a Drive pinion shaft 64 will be rotated. The rotational resistance at this time is detected by the torque detector provided in the preload measuring runner 5, thereby increasing the preload applied to the pair of tapered roller bearings 62 and 63 that support the drive pinion shaft 64. will be measured. Note that if this preload is not appropriate, the operation of tightening (or loosening) the nut 65 described above is performed again.

By the way, the above explanation is based on the first engagement unit 25.
₁ is used to tighten the nut 65 and measure the preload, but when performing the above work on a differential device with different specifications such as the size of the nut and the position of the bolt hole in the companion flange, The setup change of the preload adjustment device 1 is performed as follows.

That is, first, the rotation transmission shaft 17 is moved upward by the rotation transmission shaft lifting cylinder 22 and pulled out from the socket shaft 28 ₁ of the first engagement unit 25 ₁ .
The positioning and clamping cylinders 46 and 49 are operated respectively to remove the pin 47 from the positioning hole 45 ₁ and release the clamping member 50 from holding the pressing piece 48 ₁ . Next, in this state, the swinging cylinder 12 shown in FIG. 1 is operated to swing the swinging base 7 from the position shown in FIGS. 2 and 3 in the direction a via the arm 14 and the hollow support shaft 9. , the second engagement unit 25 ₂ is positioned on the axis of the nut tightening runner 4 at a lower nut tightening position. Then, the first engagement unit 25 ₁
Spline-fit the rotation transmission shaft 17 to the socket shaft ₂₈₂ in the same manner as when using the swing base 7.
Align and clamp. As a result, nut tightening work or preload measurement work is performed for differential devices having different specifications such as the size of the nut and the position of the bolt hole in the companion flange.

(Effects of the invention) As described above, according to the preload adjustment device according to the present invention, preload adjustment can be performed for workpieces with different specifications using one device, and setup changes due to changes in specifications can be avoided. This can be accomplished by simply swinging the movable base member and some incidental operations. In particular, according to the present invention, the drive means for nut tightening and the drive means for preload measurement can be used for works of multiple specifications, so a versatile preload measuring device with a relatively simple configuration can be achieved. You will get it.

[Brief explanation of the drawing]

1 to 5 show a preload adjustment device according to an embodiment of the present invention, FIG. 1 is an overall front view, FIG. 2 is an enlarged vertical sectional front view of the main part taken along the line of FIG. FIG. 3 is a bottom view taken in the line direction of FIG. 2, FIG. 4 is a cross-sectional bottom view taken along the line of FIG. 2, and FIG. Moreover, FIG. 6 is a longitudinal sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Preload adjustment device, 4... First rotational drive means (runner for nut tightening), 5... Second rotational drive means (runner for preload measurement), 7... Swinging base member, 28 ₁ , 28 ₂ ... Rotating engagement member (engagement drum), 39 ₁ , 39 ₂ ... Clutch.

Claims (1)

[Scope of utility model registration request] A preload adjustment device that applies a preload to the bearing by tightening a screw member to a shaft member rotatably supported via a bearing, and also measures the preload by rotating the shaft member, wherein the screw A first rotational drive means for tightening the member, a second rotational drive means for measuring the preload, a swinging base member that is swingable about the axis of the second rotational drive means, and the swinging base. supported by a member, and selectively positioned on the axis of the first rotational drive means by the rocking of the member;
A plurality of screws that fix the shaft member when the screw member is tightened by the rotational drive means, and are rotationally driven by the second rotational drive means via a clutch to rotate the shaft member when preload is measured by the second rotational drive means. A preload adjustment device characterized by having a rotational engagement member.