JPH0643189B2 - Shaft coupling assembly adjustment method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for assembling and adjusting a shaft coupling in which an input shaft is connected to the middle of an output shaft via a gear train.

(Prior Art) Conventionally, for example, JP-B-60-44186 and JP-A-61-61
As disclosed in Japanese Patent Application Laid-Open No. 9374, a rear steering gear box device for mechanical four-wheel steering is known, and the device includes an input shaft connected to a front wheel steering system via a linkage shaft, and an input shaft connected to the input shaft. A series of eccentric pinion gears,
An output shaft for steering the rear wheels, which is connected via an internal gear, a slider, a slider guide, and the like.

The device is required to have accurate steering angle characteristics (the amount of rear wheel turning angle with respect to the steering wheel rotation angle and its timing) and to have sufficient rigidity and smooth steering force.

Even if the performance of each component is excellent, these performances are largely influenced by the way of assembling them.

In the shaft coupling in which the input shaft is connected to the middle of the output shaft via the gear train as in the gear box device, the gear train is pressurized to appropriately adjust the rotational rigidity and the friction torque, and the gear train is also used. If the backlash is not adjusted properly, the specified performance cannot be achieved. Further, since these adjustments are related to each other, even if careless adjustments are made, the already adjusted state may be changed by other adjustments.

In addition, conventionally, this type of assembly method is to assemble each component sequentially along the assembly line conveyor, perform performance inspection after all components have been assembled, and make a separate inspection for non-standard components. It was common to make reassembly adjustments on the line. For this reason, a readjustment step must be separately provided, a readjustment must be performed on the readjusted one, and this is repeated until the standard is passed. Therefore, it is difficult to synchronize the regular assembly line with the readjustment line, and when both lines are combined into one system, a complicated bypass line must be provided. If these are constructed into one straight line, the assembly line becomes longer.

(Problems to be Solved) The present invention eliminates such inconvenience and can be integrated with the assembly line without intervening even if it is interposed in the middle of the assembly line. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for assembling and adjusting a shaft coupling that enables a shaft coupling satisfying a predetermined performance to be assembled at the same time when the assembly is completed.

(Means for Solving Problems) In order to solve the above problems, the present invention provides a method for assembling and adjusting a shaft coupling in which an input shaft is connected to the middle of an output shaft via a gear train. A first preload adjusting step of applying a predetermined torque to one end of the output shaft in a pressurized state, measuring the rotation angle of the other end, and adjusting the pressurization until the rotation angle is within a predetermined range, and then setting the input shaft to a predetermined position. After the preload adjustment is completed by the second preload adjusting step of measuring the torque required to give the angle rotation of the above and adjusting the pressurization until the torque becomes within a predetermined range, the input shaft is further fixed and the output is performed. It is characterized in that the load in the axial direction is applied to one end of the shaft, the displacement distance of the output shaft is measured, and the backlash adjustment is performed until the displacement distance falls within a predetermined range.

(Operation of the above means) According to the above process, since the backlash adjustment is performed after the pressurization of the two preload adjustments is performed until the predetermined performance is satisfied, it is not necessary to perform the repreload adjustment. Since the backlash adjustment is performed until the predetermined performance is satisfied, the readjustment is not necessary in the subsequent assembly stage.

(Embodiment) A more detailed description will be given with reference to the drawings showing an embodiment of the present invention.

1 is a cross-sectional view of a rear steering gear box device for mechanical four-wheel steering, which is a shaft coupling assembled and adjusted by the method of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 3 to 5 are diagrams for explaining each assembly adjustment, FIG. 6 is a schematic view of a main part of the assembly line of this embodiment, FIG. 7 is a cross-sectional view of the main part of FIG. 6, and FIG. The figure is a diagram showing the work procedure in the assembly line of FIGS. 6 and 7.

In FIG. 1, reference numeral 1 is an input shaft, and a flange 2 is formed at the rear end of the input shaft 1 as shown in FIG.
The eccentric shaft 3 is projected from the.

On the eccentric shaft 3, a cylindrical member 6 integrally provided with a circular eccentric cam 5 at the rear of the pinion 4 is rotatably fitted. That is, the balls 7 are provided between the inner periphery of the pinion 4 of the tubular member 6 and the rear portion of the eccentric shaft 3 to form an angular bearing, and the roller 8 is provided between the inner periphery of the eccentric cam 5 and the front portion of the eccentric shaft 3. Intervene ...

On the other hand, an engaged member 10 is fixedly provided at the center of the output shaft 9 as shown in FIG. That is, the engaged member 10 is attached to the tubular portion 1.
1 is fixedly integrated with the center of the output shaft 9 by a bolt 12 and female taper surfaces 14 and 14 facing forward are formed on the facing surfaces of the two left and right vertical wall portions 13 and 13 projecting forward of the output shaft 9.

An engaging member 16 is mounted on the eccentric cam 5 with balls 15 interposed therebetween, and the eccentric cam 5 is provided with a contact type angular bearing. Male taper surfaces 18 facing rearward on the side surfaces of the left and right vertical wall portions 17 of the engaging member 16,
18 is formed.

Further, when the engagement member 16 and the engaged member 10 are assembled, the axis line held by the retainer 19 between the left and right tapered surfaces 18, 14, 18, 14 as shown in FIG. The rollers 20 ..., 20 ... which are horizontal are respectively interposed.

A box 21 is provided at the center of the input shaft 1 and the output shaft 9 described above.
In addition, the front portion and the left and right portions are supported by the holder 24 formed integrally with the pipes 22, 23, 23. That is, the engaged member 10 is exposed in the box 21 of the holder 24, and the output shaft 9 is horizontally supported in the left and right pipes 23, 23 by metal bearings 25, 25 so as to be horizontally slidable. Then, the eccentric shaft 3 faces the inside of the box 21, and the engaging member 16 is engaged with the engaged member 10 via the rollers 20, ..., 20, and the input shaft 1 is rotatably shafted in the front pipe 22. Support.

Further, an internal ring gear 26 is provided on the inner side of the box 21 as viewed from the rear side so that the pinion 4 engages and revolves. The ring gear 26 is composed of two ring gears 27 and 28 that are stacked in the axial direction. One gear 28 is non-rotatably fixed to the box 24 by a bolt 29, and the other gear 28 is vertically attached to one side. Adjustment bolts 31, 31 that form the step portions 30, 30 and are screwed from the vertical direction of the box 24
Is applied to the steps 30, 30. In addition, both ring gears 27, 2
7 is provided with a large number of recesses 32 ... Penetrating in the axial direction, and a rubber coupling member 33 is contracted in the recesses 32 in the circumferential direction to preload the rotatable gear 27.

Specifically, the input shaft 1 is supported by mounting a ring 35 on the front portion of the flange 2 at the rear end thereof with balls 34 ...
Ring 3 with contact type angular bearing
5 is fitted to the inner circumference of the base end portion of the pipe 22. Then, the thrust washer 36 is applied to the front end of the ring 35, the disc spring 37 is inserted, and the disc spring 37 is contracted via the collar 38 to preload the ring 35 to urge it backward. More pipe 2
A lock nut 39 is screwed onto the unit 2. Further, a seal cap 40 was capped on the front end of the pipe 22, and a bearing 42 held by a retainer 41 provided inside the cap 40 was interposed between the collars 38.

After being assembled in this way, this gear box device completes the assembly by connecting tie rods (not shown) for the rear wheels to the tray at both ends of the output shaft 9 via ball joints.

Before the step of assembling this tie rod, its performance is measured and inspected, and assembling adjustment is performed until the inspection result satisfies a predetermined performance.

This assembly adjustment is an adjustment performed by pressurizing the cap 40 shown in FIG. 1 (hereinafter referred to as preload adjustment) and a backlash adjustment performed by tightening the adjustment bolt 31 shown in FIG. .

This backlash adjustment directly affects the backlash of the output shaft 9 that greatly affects the final function, but has little effect on the friction torque and rotational rigidity of the other input shafts 1. On the other hand, the preload adjustment affects not only the overall rotational rigidity but also the play of the output shaft 9. Therefore, the backlash of the output shaft 9 also changes due to the preload adjustment, and therefore the preload adjustment must be performed before the backlash adjustment. Here, the backlash of the output shaft 1 refers to a displacement distance in the axial direction when a predetermined load is applied to the output shaft 9 in the axial direction.

This preload adjustment performed first pays attention to the rotational rigidity of the output shaft 9 and the friction torque of the input shaft 1. That is, the tightening of the cap 40 has a first effect on the rotational rigidity of the output shaft 9.
And secondly, the friction torque of the input shaft 1 is affected.

The rotational rigidity of the output shaft 9 appears in the rotation angle of the output shaft 9 when a predetermined torque is applied to one end of the output shaft 9, and the rotation angle decreases as the preload increases. The relationship with is as shown in FIG. Therefore, a predetermined proper rotation angle range is set in advance, the rotation angle at a predetermined torque is measured, and whether or not the measured rotation angle falls within this range is inspected and determined to perform preload adjustment (first Preload adjustment process).

The friction torque of the input shaft 1 is a torque required to rotate the input shaft 1. As the preload is increased, the sliding resistance of the gear train is increased to increase the friction torque. The relationship is as shown in the fourth diagram. Therefore, a predetermined proper friction torque range is set in advance, the predetermined range is rotated to measure the friction torque during that period, and whether the torque falls within this range is inspected and determined to perform preload adjustment (second step). Preload adjustment process).

In this preload adjustment, as described above, the rotational rigidity of the output shaft is adjusted, and then the friction torque is adjusted.
Backlash adjustment is performed after this adjustment is completed.

The backlash adjustment appears as a displacement amount in the axial direction of the output shaft when the rotation of the input shaft is blocked and a predetermined load is applied to the output shaft in the axial direction, and when the backlash decreases, the displacement amount also decreases. The relationship between the two is as shown in FIG. Therefore, set a predetermined range of appropriate displacement in advance,
A predetermined load is applied to measure the displacement amount, whether the displacement amount falls within this range is inspected, and backlash adjustment is performed.

The above adjustment is performed by the line configuration shown in FIGS. 6 and 7. Reference numeral 50 denotes a transfer device, which is a pallet conveyor that transfers and mounts the gear box device A on a pallet 51 that is movable from left to right in the drawing.

The pallet conveyor 50 positions the pallet 51 on the way and prevents the load of the pallet 51 from being applied to each unit when the pallet 51 is mounted on various measuring units which are assembly inspection devices as will be described later. A floating positioning device 49 for elastically supporting and floating by a spring 48 is provided. The floating positioning device 49
As shown in FIG. 7, the pallet 51 is conveyed by a spring 48 to a floating positioning table 47, fixed by a pallet positioning jig (not shown), and then floated.
The loads of are offset. 45,45 is the lifting device for the pallet 51,
Reference numeral 46 is a device for lowering the positioning table 47 when the pallet 51 is loaded.

First, the gear box device A is reciprocally moved by the cylinder 52 along one side (upper side in the drawing) of the pallet conveyor 50 at a position where the gear box device A is assembled and conveyed in the state shown in the first drawing.
A table 53 is provided, and a pair of second and third tables 54 and 55 which can be freely attached to and detached from the pallet 51 are provided on the table 53. At the center of the second table 54 on the upstream side of the conveyor 50, a clamp unit 56 for clamping and fixing the gear box device A is provided while preload adjustment is being performed, and the output shaft is provided on the left side of the unit 56 in the drawing. A torque load unit 57 for applying a predetermined torque and an angle measuring unit 58 for measuring the rotation angle of the output shaft were provided on the right side. The third table 55 on the downstream side of the conveyor 50 is provided with a clamp unit 59 for clamping and fixing the gear box device A while the backlash adjustment is being performed, and a unit for measuring the displacement amount of the output shaft on the left side thereof. A load applying unit 61 for applying a predetermined load to the output shaft along the axial direction is provided on the right side of 60.

Further, a fourth table 62 is provided so as to be reciprocally movable along the other side (lower side in the drawing) of the pallet conveyor 50, and one side of the fourth table 62 is provided with a predetermined rotation angle of the input shaft 1 for preload adjustment. A unit 63 for measuring the friction torque at that time is provided, and an input shaft fixing unit 64 for fixing the input shaft at the time of backlash adjustment is provided on the right side.

A CRT and a printer 65, on which the measurement results are displayed, are provided above the drawing of the first table 53.

Therefore, the gear box device A assembled as shown in the first drawing is placed on the pallet 51 and is conveyed to the position facing the fourth table 62, and the floating positioning device is provided.
Positioned and fixed at a position where it can be clamped with 49.

Next, the first table 53 is moved by the cylinder 52, the second table 54 is further moved to face the pallet 51, and the gear box device A is fixed by the clamp unit 56. Then, the pallet 51 is floated by the floating positioning device 49. After that, the torque load unit is attached to the output shaft.
57 and the rotation angle measuring unit 58 are attached, the rotation angle at a predetermined torque is measured, and the preload adjustment is performed by adjusting the cap 40 shown in the first figure so that the rotation angle falls within a predetermined range while determining the measurement result by the CRT65. I do. After this is completed, set the input shaft to the friction torque measuring unit of the fourth table 62.
The input shaft is connected to the unit 63, the input shaft is rotated within a predetermined range by the unit 63, the friction torque is measured during that period, and the measurement result is judged by the CRT 65, while the cap 40 is adjusted so that the torque falls within the predetermined range. Adjust the preload. The adjustment is repeated until both of these two preload adjustments fall within a predetermined range.

Then, the clamp of the clamp unit 56 is released and the second
Move the table 54, and then move the third table 55 to the pallet 51.
Move to the position to face. Again, the pallet 51 is positioned and fixed by the floating positioning device 49, and then the gear box device A is clamped and fixed by the clamp unit 59. Then, the displacement amount measuring unit 60 and the load load unit 61 are connected to the output shaft, the input shaft fixing unit 64 is further connected to the input shaft, the displacement amount is measured by applying a predetermined load, and the measurement result is Judgment is made by the CRT 65, and the backlash is adjusted by adjusting the adjusting bolt 31 so that the displacement amount falls within a predetermined range. The data measured at the time of each adjustment is recorded and stored for each gear box device, which is useful for quality control at a later date.

After each adjustment is completed in this way, the gear box device A is moved to the next tie rod assembly step by moving the pallet 51.

The above-described assembly adjustment process is illustrated in FIG.

(Effects of the Invention) As is apparent from the above description, the present invention performs backlash adjustment after completion of preload adjustment. Therefore, when these adjustments are completed, it is possible to obtain a shaft coupling having predetermined performance. Yes, it does not require inspection or adjustment again after the assembly is completed, and each adjustment can be done independently, so there is no need to perform preload adjustment again after backlash adjustment, therefore preload adjustment Since the backlash adjustment and the backlash adjustment are performed in time series, there is no problem even if the assembly line is incorporated into the assembly line, and there is an effect of providing an axial hand assembly adjustment method that enables the assembly line to be as short as necessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rear steering gear box device for mechanical four-wheel steering, which is a shaft coupling assembled and adjusted by a method according to an embodiment of the present invention, and FIG. 2 is II-II of FIG.
Sectional views, FIGS. 3 to 5 are diagrams for explaining each assembly adjustment, FIG. 6 is a schematic view of a main part of the assembly adjustment line of the present embodiment, and FIG. 7 is a main part of FIG. FIG. 8 is a sectional view of a portion, and FIG. 8 is a diagram showing a work procedure in the assembly adjustment line of FIGS. 6 and 7. A ... Shaft coupling, 1 ... Input shaft 9 ... Output shaft

Claims (1)

[Claims] 1. A method of assembling and adjusting a shaft coupling, wherein an input shaft is connected to the middle of an output shaft via a gear train, wherein a predetermined torque is applied to one end of the output shaft in a state where the input shaft is pressurized. A first preload adjustment step of measuring the rotation angle of the other end and adjusting the pressurization until it falls within a predetermined rotation angle range, and then measuring the torque required to give a predetermined angle rotation of the input shaft, After the pressurization adjustment is completed by the second preload adjusting step of adjusting the pressurization until the pressure becomes within a predetermined range, the input shaft is further fixed and a load in the axial direction is applied to one end of the output shaft to displace the output shaft. A method for assembling and adjusting a shaft coupling, which comprises measuring a distance and performing backlash adjustment until the displacement distance falls within a predetermined range.