JP3039202B2 - Bearing spacing measurement device for automotive final reduction gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the distance between a front bearing and a rear bearing for supporting a drive pinion shaft in a final reduction gear of an automobile.

[0002]

BACKGROUND ART As shown in FIG. 3, in the final reduction gear U automobile consists reduction gearbox G ₁ and the differential gear unit G ₂ Prefecture, drive pinion shaft P of the reduction gear G ₁ is a front Bearing B ₁ and rear bearing B ₂
And rotatably supported by the housing H via

[0003] Then, so as to interposed between the spacer S ₁ and shim plate S ₂ both bearings B ₁ a, B ₂ together for rotational resistance of the bearings B _1, B ₂ is adjusted to be appropriate Although it has to, since the size of the interposed spacer S ₁ and shim plate S ₂ to be depends on the machining dimensional accuracy distance L ₂ between the bearing pressure surfaces F _1, F _2, the spacer S ₁ and the in selecting the size of the shim plate S ₂ it is necessary to accurately grasp the distance dimension H ₁ between the inner ring R _1, R ₂ both bearings B _1, B _2.

[0004] Therefore, conventionally, while measuring the dimensions L ₂ between the bearing pressure surfaces F _1, F ₂ in a state that is not the bearings B _1, B ₂ is assembled into the housing H, each bearing B _1, B inner ring ₂ single state R _1, R ₂ and the outer ring R _11,
After individually measuring the dimensions L ₄ and L ₅ of the step between the bearings R ₁₂ and R ₁₂ , a predetermined calculation is performed based on these dimensions L ₂ , L ₄ and L ₅ to obtain the bearings B ₁ and B 5. ₂ of the inner ring R _1, is to obtain the dimensions H ₁ between R _2.

[0005]

[SUMMARY OF THE INVENTION However, the dimensions H ₁ above, the housing H and the bearing B ₁ rather than the value determined by direct measurement, B ₂ each dimension in each single state L _2, L _4, L ₅ because it is a value determined by the calculation in terms of the measurement of not only likely error occurs, in particular the dimension L _4, L ₅ is the inner ring R ₁ of each bearing B _1, B _2, R ₂
And the outer rings R ₁₁ and R ₁₂ , the bearings B ₁ and B ₂ are in a single state and the bearings B ₁ and B ₂ are actually assembled to the housing H to some extent. The dimensions L ₄ and L ₅ are different from each other, which results in an erroneous selection of the size of the spacer S ₁ and the shim plate S ₂ .

[0006] The present invention has been made in view of the above problems, it is an object while rub the inner and outer races of the bearings, so that it can measure accurately by direct measuring the dimensions H ₁ of the Another object of the present invention is to provide a structure that has a high quality.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a space between a front bearing and a rear bearing for supporting a drive pinion shaft inserted into a housing of a final reduction gear for an automobile is provided by rotating an inner ring of each bearing. A driven device which is arranged on the same axis as the bearings so as to be able to approach and separate from each other with the bearings interposed therebetween, and presses a rear bearing against the housing from the inside of the housing toward the front bearing. A side unit, and a drive side unit that presses the front bearing from the outside of the housing toward the rear bearing toward the housing.

The driven-side unit is rotatably and slidably supported by a case, is urged in the axial direction by an elastic body, and is inserted into the rear bearing, so that an inner race of the rear bearing is provided. A driven shaft pressed against the outer surface of the driven shaft, slidably mounted via an elastic body at the tip of the driven shaft,
A measurement sleeve that is pressed against one side of the inner ring of the front bearing that faces the rear bearing, and is provided at the tip of the driven shaft so as to be able to protrude and retract in the radial direction, and faces the front bearing of the inner ring of the rear bearing. And a measurement block that is pressed against the side surface on the side to be pressed.

The drive-side unit is rotatably supported by a support and is rotationally driven by a rotation drive means. The drive-side unit is inserted into the front bearing and pressed against the outer surface of the inner race of the front bearing. A drive shaft fitted with the driven shaft, an intermediate shaft slidably inserted into the drive shaft and urged in an axial direction by an elastic body to press a tip end against the measurement sleeve; and And a measuring rod whose front end is pressed against the measuring block by being slidably inserted into the main body and pressed against the measuring block, and a main body is fixed to the other end of the intermediate shaft. Abuts against the other end of the measuring rod, and the front end is determined based on the relative displacement between the intermediate shaft and the measuring rod. Composed of a linear sensor for detecting the inner mutual distance of the rear bearing and the front bearing.

[0010]

According to this structure, the drive unit and the driven unit located on both sides of the front bearing and the rear bearing assembled to the housing are brought closer to each other, and the drive shaft and the driven shaft are fitted to each other. Above, the drive shaft and the driven shaft are synchronously rotated by the rotation driving means.

As a result, the inner ring of each bearing rotates together with the drive shaft and the driven shaft, and while the inner and outer rings of each bearing are adapted, the distance between the inner rings at that time is determined as the relative displacement between the intermediate shaft and the measuring rod. Directly detected by a linear sensor.

[0012]

1 and 2 show an embodiment of the present invention. FIG. 1 shows the structure of the upper half of the measuring apparatus, and FIG. 2 shows the structure of the lower half of the measuring apparatus. .

As shown in FIGS. 1 and 2, the housing H of the final reduction gear U in which the front bearing B ₁ and the rear bearing B ₂ have been assembled in advance is fixed to a work base (not shown). Then, with the bearings B ₁ and B ₂ of the housing H positioned and fixed to the work base, the driven unit 2 and the drive unit 1 are vertically arranged on the same axis as the bearings B ₁ and B _2. They are arranged facing each other so as to be able to approach and separate from each other.

The driven side unit 2 is constituted around a driven shaft 4 rotatably and slidably supported by a case 3.
Are urged upward by a coil spring 5. The driven shaft 4 includes a spindle 8 supported on the case 3 via a bush 6 and a thrust bearing 7.
And a bolt 9 and a pin 10 at the upper end of the spindle 8.
The measurement sleeve 13 is slidably mounted on the upper end of the attachment 11 via a coil spring 12. The measuring sleeve 13 is inserted into the measuring sleeve 13 through the elongated hole 14 on the attachment 11 side.
A pin 15 is provided, which penetrates the pin 3 radially.

The upper end of the attachment 11 is formed with a guide hole 16 that fits closely with a guide shaft portion 42 described later and a hexagon hole 17 that fits with a hexagonal shaft portion 40 described later. Have been.

An operation rod 18 eccentric from the center of the spindle 8 and the attachment 11 is rotatably and slidably provided inside the spindle 8 and the attachment 11, and the operation rod 18 is a coil. It is urged upward by a spring 19.

At the upper end of the operating rod 18, a measuring block 21 located in a gap 20 formed in the attachment 11 is fixed by bolts 22. And
The measurement block 21 has a structure in which the shoulder portion 21a can be made to protrude and retract in the radial direction of the middle diameter portion 11a of the attachment 11 by rotating the operation rod 18 together.

[0018] Therefore, the for driven-side unit 2, the rear pressed against the lower end face of the inner ring R ₂ shoulder portion 11b of the rear bearing B ₁ attachment 11 by interpolating the driven shaft 4 in rear bearing B ₂ while pressing the whole bearing B ₂ to the front bearing B ₁ direction relative to the housing H, so that the measuring sleeve 13 is pressed against the lower end face of the inner ring R ₁ of the front bearing B _1. Further, by rotating the operation rod 18, the shoulder portion 2 of the measurement block 21 is moved.
1a is contactable state protruding outside the diameter 11a on the upper end face of the inner ring R ₂ of the rear bearing B ₂ in the attachment 11.

The drive-side unit 1 is constituted around a drive shaft 27 rotatably supported via bearings 25 and 26 on a sleeve 24 integral with a frame 23 as a support. The drive shaft 27 includes a spindle 28, an attachment 30 integrally fixed to a lower end of the spindle 28 by a bolt 29, and a driven gear 31 integrally fixed between the spindle 28 and the attachment 30.

On the other hand, a drive gear 34 meshing with the driven gear 31 is fixed to an output shaft 33 of a motor 32 mounted on the frame 23. When the motor 32 is started, the drive gear 34 is driven via the drive gear 34 and the driven gear 31. The shaft 27 is driven to rotate.

In the drive shaft 27, a guide sleeve 35, an intermediate shaft 36 and a measuring rod 37 are provided.
Are provided concentrically.

The guide sleeve 35 is slidably provided in the attachment 30 and is urged downward by a coil spring 38, while a hexagonal flange portion 39 and a hexagonal shaft portion 40 are formed above and below the guide sleeve 35. Have been. The flange portion 39 is engaged with the hexagon hole 41 on the attachment 30 side to prevent the relative rotation between the attachment 30 and the guide sleeve 35, while the hexagon shaft portion 40 is connected to the driven unit 2 described above. And the hexagonal hole 17 of the attachment 11 of FIG. At the same time, the attachment 3
The guide shaft portion 42 at the lower end of 0 is also fitted closely with the guide hole 16 of the attachment 11 of the driven side unit 2.

The upper end of the intermediate shaft 36 is slidably supported in a spring case 44 via a coil spring 43, while the lower end is pressed against the pin 15 of the measuring sleeve 13. Also,
The measuring rod 37 inserted in the intermediate shaft 36 is slidable by being urged by a coil spring 45, and a tracing stylus 46 at the lower end thereof is pressed against the upper end surface of the measuring block 21.

At the upper end of the intermediate shaft 36, a main body 48a of a spindle type linear sensor (commercially available under the trade name of Magnescale) 48 is fixed via a holder 47, and the linear sensor is The 48 stylus 48b is in contact with the upper end surface of the measuring rod 37.

The spring case 44 is connected to a piston rod 52 of a cylinder 51 provided on the frame 23 via a support plate 49 and an adapter 50. The support plate 49 has a guide rod 53.
Are fixed integrally, and the guide rod 53 is guided and supported by a guide sleeve 55 on the frame 23 side via a linear bearing 54. Therefore, the intermediate shaft 36 and the measuring rod 37 move up and down together with the linear sensor 48 according to the expansion and contraction operation of the cylinder 51.

[0026] In constructed measuring device as described above, while raising the driven-side unit 2 as described above to insert the driven shaft 4 in rear bearing B _2, the drive-side unit frame It is lowered by 23 to insert the drive shaft 27 to the front bearing B _1. At this time, the cylinder 51
Movement of the intermediate shaft 36 and the measuring rod 3
7 has risen to a ascent limit position P ₁ shown in FIG.

When the drive unit 1 is lowered,
The guide shaft portion 42 at the tip of the attachment 30 of the drive shaft 27 fits closely with the guide hole 16 at the tip of the attachment 11 on the driven shaft 4 side, and at the same time, the hexagonal shaft portion 40 at the tip of the guide sleeve 35 is attached to the attachment 11 on the driven shaft 4 side. The hexagonal hole 17 at the tip is fitted. As a result, torque can be transmitted from the drive shaft 27 side to the driven shaft 4 side, and at the same time, both are centered.

[0028] On the other hand, the shoulder portion 30a of the drive shaft 27 side of the attachment 30 is pressed against the upper end surface of the inner ring R ₁ of the front bearing B _1, lower ie rear bearing its entirety front bearing B ₁ with respect to the housing H against the B ₂ side.

When the motor 32 is started in this state,
The drive shaft 27 is rotationally driven via the drive gear 34 and the driven gear 31, and at the same time, the driven shaft 4 is also synchronously rotated due to the hexagonal engagement between the guide sleeve 35 and the attachment 11 on the driven shaft 4 side. By the synchronous rotation of the drive shaft 27 and the driven shaft 4, the inner ring R of each of the bearings B ₁ and B ₂ is formed.
_1, R ₂ may also be rotated, their inner ring R _1, R ₂ and the outer ring R _11, adapt and R _12.

Subsequently, while the drive shaft 27 and the driven shaft 4 are rotating, the contraction of the cylinder 51 causes the intermediate shaft 36 and the measuring rod 37 to rotate.
Is lowered together with the linear sensor 48.

As a result, the lower end surface of the intermediate shaft 36 is pressed against the pin 15 of the measuring sleeve 13 which is pressed against the lower end surface of the inner ring R ₁ of the front bearing B ₁ , while the probe at the lower end of the measuring rod 37 is pressed. 46 presses down the measuring block 21 together with the operation rod 18 by a predetermined amount while pressing against the upper end surface of the measuring block 21 to
It is pressed against the shoulder portion 21a on the upper end surface of the inner ring R ₁ of the rear bearing B _2.

As a result, as shown in FIG. 3, the distance H ₁ between the inner rings of the bearings B ₁ and B ₂ is increased via the measuring sleeve 13 and the pin 15 and the measuring block 21 to the intermediate shaft 36 and the measuring rod. 37 and is taken out as a relative displacement with respect to the main body 4 of the linear sensor 48 in accordance with the displacement.
8a and the measuring element 48b is above inner ring mutual distance H ₁ by relative displacement is detected by the linear sensor 48.

For example, the rear bearing B shown in FIG._TwoIs up and down
If displaced, the inner ring R_TwoMeasurement block 2 pressed against
1 and the linear sensor 48 via the measuring rod 37.
The fixed element 48b is vertically displaced, while the front bearing B
₁Is displaced up and down, its inner ring R₁Measuring sleeve pressed against
Via the pin 13 and the intermediate shaft 36.
The main body 48a of the near sensor 48 is vertically displaced, and as a result,
The distance H between the inner rings described above ₁By the linear sensor 48
It will be detected directly.

[0034]

As described above, according to the present invention, the distance between the inner rings is directly measured while rotating the inner rings of the bearings while the bearings are actually mounted on the housing. The distance between the inner rings can be measured accurately with less error compared to the method of
Also, by measuring while rotating the inner ring, the dimensions in the state where the inner and outer rings are adapted can be obtained, so that the dimensions between the inner rings do not fluctuate in the actual assembled state as in the past, As a result, when selecting a spacer or a shim plate having a size corresponding to the size between the inner rings, a selection error does not occur. In addition, the work of measuring the dimensions between the inner rings can be automated so that the rationalization can be achieved.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a measuring apparatus according to the present invention, and is an explanatory view of a configuration of an upper half thereof.

FIG. 2 is a view showing an embodiment of the measuring apparatus of the present invention, and is a configuration explanatory view of a lower half thereof.

FIG. 3 is an explanatory sectional view of a final reduction gear for an automobile.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive side unit 2 ... Driven side unit 3 ... Case 4 ... Driven shaft 5 ... Coil spring 12 ... Coil spring 13 ... Measuring sleeve 19 ... Coil spring 21 ... Measuring block 23 ... Frame (support) 27 ... Drive shaft 32 ... motor (rotation driving means) 36 ... intermediate shaft 37 ... measuring rod 38 ... coil spring 43 ... coil spring 45 ... coil spring 48 ... linear sensor 48a ... main body 48b ... measuring element B ₁ ... front bearing B ₂ ... rear bearing H ... housing P ... drive pinion shaft R _1, R ₂ ... inner U ... final reduction gear

Claims (1)

(57) [Claims] 1. An apparatus for measuring a distance between a front bearing and a rear bearing for supporting a drive pinion shaft inserted into a housing of a final reduction gear while rotating an inner ring of each bearing, A driven unit which is arranged on the same axis as the respective bearings so as to be able to approach and separate from each other with the bearings interposed therebetween, and presses a rear bearing from the inside of the housing toward the front bearing toward the housing; and a front unit from the outside of the housing. A drive-side unit for pressing the bearing against the housing in the rear bearing direction, wherein the driven-side unit is rotatably and slidably supported by the case and is urged in the axial direction by an elastic body, Interpolated in the rear bearing A driven shaft that presses against the outer surface of the inner ring of the rear bearing by being slidably attached to the tip of the driven shaft via an elastic body, and is provided on one side of the inner ring of the front bearing facing the rear bearing. A measuring sleeve which is provided at the tip of the driven shaft so as to be able to protrude and retract in the radial direction and which is in contact with a side surface of the inner ring of the rear bearing which faces the front bearing; The drive-side unit is rotatably supported by a support and is rotationally driven by a rotation driving means, and is inserted into the front bearing so as to press against the outer surface of the inner race of the front bearing and contact the driven shaft with the driven shaft. A drive shaft to be fitted; An intermediate shaft whose front end is pressed against the measurement sleeve while being slidably inserted into the intermediate shaft and axially urged by the elastic body. A measuring rod that is urged and whose tip presses against the measuring block; a main body fixed to the other end of the intermediate shaft; and a tracing stylus abuts the other end of the measuring rod to form the intermediate shaft. A linear sensor for detecting a distance between the inner rings of the rear bearing and the front bearing based on a relative displacement between the measuring rod and the measuring rod.