JPS6344970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selection method for selecting the length of a spacer or spacer and shim to be inserted between a pair of rolling bearings used in a bearing for a power transmission shaft of an automobile. It is something.

B. Prior Art When supporting a power transmission shaft of an automobile, such as a drive pinion of a differential, as shown in FIG. 1, two rolling bearings, such as a first tapered roller bearing 2 and a second A drive pinion 4 is rotatably supported using a tapered roller bearing 3. In such a support structure, an appropriate preload is applied to the first and second tapered roller bearings 2 and 3 via the nut 5 and the pressing member 6 in order to prevent the drive pinion 4 from wobbling and to increase the support rigidity. ing.

However, simply applying preload to the first and second tapered roller bearings 2 and 3 may cause the drive pinion 4 to move in the axial direction when a high load is applied. A spacer 7 is installed between the inner rings 2a and 3a of the tapered roller bearings 2 and 3.
Alternatively, a spacer 7 and an insert such as a shim 8 are provided.

By the way, the spacer 7 and the shim 8 are connected to the nut 5.
The dimensions are such that when tightened, the drive pinion 4 and ring gear 9 mesh properly and a predetermined preload is applied to the first and second tapered roller bearings 2 and 3. Conventionally, the spacer 7 and shim 8 were selected arbitrarily with appropriate dimensions, and then actually assembled, and in this state, the starting torque and meshing of the drive pinion 4 were inspected to determine whether they were appropriate. had been selected. Therefore, due to deformation of the housing 1 during assembly, molding errors of each part, etc., the dimensions of the spacer 7 and shim 8 selected in advance are unlikely to be appropriate, and the shims 8 with different dimensions may be used several times. The spacer 7 and the shim 8 have to be selected by disassembling and reassembling them, and a great deal of effort and time is required to select the spacer 7 and the shim 8.

(b) Purpose of the Invention This invention determines the dimensions between both inner rings when a predetermined preload is applied to two sets of rolling bearings assembled in a housing, and obtains the appropriate dimensions of the insert from this dimension. The purpose is to provide a method for selecting inserts.

C. Structure of the Invention This invention provides an arrangement between inner rings 2a and 3a of two bearing rolling bearings 2 and 3 assembled in a housing 1.
A shaft member 1 that is relatively slidable and has a spring 16 interposed therein that presses in the direction of separation in place of the insert.
4 and a cylindrical body 15, and in which the amount of displacement of the shaft member 14 when shortened to a specific dimension under a constant pressure is measured in advance, a measuring tool 13 is placed, and the shaft member 14 is attached to one inner ring 2a. , the cylinders 15 are attached to the other inner ring 3a, and in this state, pressure is applied from the outside to give a predetermined preload to each rolling bearing 2, 3, and the displacement of the shaft member 14 of the measuring tool when this pressure is applied is measured. The difference between this measured value Cx and the previously measured displacement Co of the shaft member and the specific dimensions of the measuring tool
This selection method selects the appropriate size Lx of the insert based on Lo.

D. Example FIGS. 2 and 3 are cross-sectional views showing an example of an apparatus used for carrying out the method of the present invention.
Reference numeral 10 denotes a base, and a support portion 11 is integrally formed on the upper surface of the central portion thereof to fit into and support the inner ring 3a of a rolling bearing, for example, the second tapered roller bearing 3. Reference numeral 12 denotes a non-contact gap amount detection sensor (hereinafter simply referred to as a sensor) built into the center of the support portion 11 of the base 10, and has a head portion 12a protruding from the upper surface of the support portion 11 to detect the gap amount as described below. Amount 23
is detected, and an electrical signal is transmitted to an external control unit (not shown) via the electric wire 12b.

Reference numeral 13 denotes a measuring tool installed between both inner rings 2a and 3a of the first tapered roller bearing 2 and the second tapered roller bearing 3 assembled in the housing 1, and includes a shaft member 14, a cylindrical body 15, and a spring 16. It is made up of. The shaft member 14 has a large-diameter flange 17 integrally formed at its lower end, and a support block 19 with a hat-shaped cross section is mounted on a small-diameter shaft portion 18 at its upper end, and is supported by a shaft shoulder portion 14a and supports the small-diameter shaft portion 1.
8 and a nut 20 is screwed together. The cylindrical body 15 is formed into a double cylindrical shape and has an annular space 21 therein along the axial direction, and a guide cylindrical part 2 at the bottom.
2 is formed. A cylindrical body 15 is slidably fitted onto the outer periphery of the shaft member 14, and a spring 16 is accommodated in the annular space 21 of the cylindrical body 15, the end of which is brought into contact with the lower surface of the support block 19. The elasticity causes the shaft member 14 and the cylinder 15 to move away from each other, and the lower surface of the cylinder 15 is engaged with the flange 17. In addition, this measuring tool 13 uses the shaft member 14 at the time of measurement.
The lower surface of the flange 17 is arranged so as to face the head portion 12a of the sensor 12 with an appropriate gap 23 in between.

24 is a pressure rod that applies pressure to the first and second tapered roller bearings 2 and 3 to preload them during measurement, and is supported so as to be able to move up and down. ).

In the above device, the case of selecting the dimensions of the spacer 7 and the shim 8 to be inserted between the inner rings 2a, 3a of the first tapered roller bearing 2 and the second tapered roller bearing 3 will be explained. In this case, use a spacer 7 formed to an appropriate size (l),
The thickness (t) of the shim 8 shall be selected.

First, the inner ring 3a of the second tapered roller bearing 3 is fixed to the support portion 11 of the base 10 in an upright manner. Next, the measuring tool 13 is placed above the inner ring 3a, and the lower guide cylinder portion 22 of the cylinder 15 is fitted into the inner ring 3a. After that, the housing 1 into which the outer rings 3b and 2b were press-fitted via the tapered roller 3c is attached to the measuring tool 1.
3, and then cover the tapered roller 2c and inner ring 2 of the first tapered roller bearing 2.
a into the housing 1 side, and at the same time the inner ring 2
a into the support block 19 of the measuring tool 13,
The flange 17 of the shaft member 14 of the measuring tool 13 is opposed to the head portion 12a of the sensor 12. After that, the pressure rod 24 is lowered, and the pressure rod 24 presses the inner ring 2a of the first tapered roller bearing 2 downward, from the inner ring 2a to the tapered roller 2c, the outer ring 2b, the housing 1, and the second tapered roller. The outer ring 2b and tapered roller 3c of the bearing 3 are pressed to apply preload to the first tapered roller bearing 2 and the second tapered roller bearing 3, and at the same time, the measuring tool 13 is applied to the inner ring 2a via the support block 19.
lower the shaft member 14. Then, while applying pressure with a predetermined pressure and simultaneously rotating the housing 1, the head portion 12a of the sensor 12 and the measuring tool 1 are
The displacement amount (Cx) of the measuring tool 13 from the change in the amount of clearance between the flange 17 and the flange 3 (Cx = Ao' - Bo', Ao' is the amount of gap before pressurization, Bo' is the amount of gap after pressurization ) to measure.

On the other hand, the shaft member 1 corresponding to the specific dimensions of the measuring tool 13
The displacement amount of 5 is determined in advance. That is, as shown in FIG. 4, the pedestal 34 is mounted on the support part 11 of the base 10, the gap amount Ao at this time is measured, and then the inner shoulder part 25a of the master jig 25 having the dimensions is measured. is placed on the support block 19 of the measuring tool 13, and the pressure rod 24 is lowered to pressurize the measuring tool 15 until the lower end of the master jig 25 comes into contact with the pedestal 34, thereby shortening the measuring tool 15. The dimensions of the master jig 25 are determined so that when the master jig 25 comes into contact with the base 34, the dimension from the pedestal abutting surface of the cylinder 15 to the shoulder of the support block 19 is (Lo). .
This (Lo) becomes the specific dimension of the measuring tool 15. Therefore, by measuring the gap amount Bo during pressurization, the displacement amount (Co) of the shaft member 14 with respect to the specific dimension Lo (Co=Ao-Bo) can be determined. From the above, the difference between the unknown value Lx and the fixed displacement dimension (Lo) of the measuring tool 15 matches the difference between the displacement amounts Co and Cx of the shaft member 15. In other words, the shaft member 14
The first and second tapered roller bearings 2 and 3 assembled in the housing 1 when the amount of displacement is Cx
The dimension (Lx) between the inner rings 2a and 3a is determined by the following formula.

Lx=Lo-(Cx-Co) Here, Lo, Cx, and Co are all measured, and the dimension (Lx) between the inner rings 2a and 3a is known.
Thereafter, the thickness (t) of the shim 8 can be found by subtracting the measured dimension l of the spacer 7 from the dimension Lx.

That is, t=Lx-l Finally, by using the l spacer 7 and the thickness (t) shim 8 found from the calculation result above, and assembling it to the drive pinion 4, when the nut 5 is tightened, the first and 2
A predetermined preload is applied to the tapered roller bearings 2 and 3.

Note that the spacer 7 may be formed long and may be additionally machined to match the dimension (Lx) between the inner rings 2a and 3a based on the calculation result. In this way, the shim 8 becomes unnecessary.

FIG. 5 is a diagram showing another embodiment. In this embodiment, a sensor 1 for measuring the amount of displacement of the measuring tool 13 is shown.
2, a detection shaft 26 is attached to the support part 11 of the base 10.
A retaining ring 27 is attached to the lower end of the retaining ring 27, and a detection arm 28 formed in a substantially L shape in a space provided below the support part 11 is swung by a pivot pin 29. freely pivoted, one arm 2
8a is brought into contact with the lower end of the detection shaft 26, and the other arm 28b is brought into contact with the contact 30a of the dial gauge 30 provided on the side of the base 10. Reference numeral 31 denotes a support cylinder provided below the detection shaft so as to be able to move up and down. A return spring 33 is compressed and interposed between the set screw 32 at the lower end and the support cylinder 31. The support tube 31 is always pushed upward by elasticity, pushing up the detection arm 28 and the detection shaft 26, and the measuring tool 1
contact with the shaft member 14 of No. 3.

In this embodiment, the displacement of the measuring tool 13 during pressurization is measured by a dial gauge 30 via a detection shaft 26 and a detection arm 28.
In FIG. 4, the same reference numerals as in FIG. 2 indicate the same components.

E. Effects of the Invention The present invention provides a measuring tool between the inner rings of a rolling bearing assembled in a housing instead of a clamp, applies a predetermined preload to the rolling bearing, and measures the shaft member at this time. By measuring the displacement of the two rolling bearings assembled in the housing, the appropriate dimensions of the preload measurement inserts, such as spacers and shims, that are inserted between the inner rings of the two rolling bearings are determined by several approaches. This eliminates the need for accurate determination in a single operation, and greatly improves workability in assembling the insert.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the support structure of the power transmission shaft;
Fig. 2 is a sectional view showing an example of the apparatus used to implement the method of the present invention, Fig. 3 is an enlarged view of the main part of the apparatus, Fig. 4 is a sectional view of the main part showing one step of the measuring method, and Fig. 5 is a sectional view of the main part showing one step of the measuring method. FIG. 7 is a sectional view showing another embodiment. 1... Housing, 2, 3... Rolling bearing (taper roller bearing), 2a, 3a... Inner ring,
7... Spacer, 8... Sim, 10... Base, 13...
... Measuring tool, 14 ... Shaft member, 15 ... Cylindrical body, 12
……sensor.

Claims (1)

[Claims] 1. The two rolling bearings that support the power transmission shaft at both ends in the housing are assembled with a spacer or a spacer and a shim or other intervening insert between the inner rings, and a certain preload is applied to the rolling bearings. This is a method of selecting a pincer of an appropriate length when attaching a housing, and instead of a pinfit between the inner rings of two rolling bearings assembled in a housing, it is a method that allows for relative sliding between the inner rings of the two rolling bearings. A measuring tool is arranged in which the amount of displacement of the shaft member is measured in advance when the shaft member is shortened to a specific dimension with a constant pressure, and is made up of a shaft member interposed with a spring that presses the shaft member in the direction of separation. A shaft member is attached to the inner ring of the bearing, and a cylindrical body is attached to the inner ring of the other, and in this state, pressure is applied from the outside to give a predetermined preload to each rolling bearing.
Measure the amount of displacement of the shaft member of the measuring tool during this pressurization,
A preload setting clamp for a rolling bearing, characterized in that the appropriate size of the clamp is selected based on the difference between this measured value and the amount of displacement of the shaft member measured in advance and the specific dimensions of the measuring tool. How to select cuttings.