JPH0818194B2 - Work assembly inspection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work assembly assembling inspection apparatus which is a gear box having an input shaft and an output shaft and requiring preload adjustment and backlash adjustment.

(Prior Art) Conventionally, a rear steering gear box device for mechanical four-wheel steering is known, for example, as seen in JP-A-60-44186 and 61-9374.
An input shaft connected to the front wheel steering system via a linkage shaft, and an output shaft for rear wheel steering connected to the input shaft via an eccentric pinion gear, an internal gear, a slider, a slider guide, and the like.

The device is required to have an accurate steering angle characteristic (the amount of turning angle of the rear wheel with respect to the steering wheel rotation angle and its timing) and also to have sufficient rigidity and functional performance having a smooth steering force.

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

Conventionally, the method of assembling this type of gearbox is to sequentially assemble each component along the assembly line conveyor,
After the assembly of all the components was completed, its performance was inspected, and if it was out of the standard, it was generally reassembled and adjusted on another 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.

For this reason, it is conceivable to perform a performance inspection of the components assembled at a predetermined stage in the assembly line, perform assembly adjustment until the predetermined performance is satisfied, and then assemble the next component.

However, when inspecting and measuring the assembling state of the work by various assembly inspecting devices in the middle of the assembly line, the work is moved to the location of the various inspecting devices every time when various inspecting and measuring are performed, and the connection and connection are performed. When repeating withdrawal,
There is an inconvenience that work efficiency becomes extremely poor.

(Problems to be Solved) The present invention eliminates such inconvenience and enables measurement and inspection for preload adjustment and backlash adjustment without positioning and moving a work, which is a gear box, on an assembly line. The present invention is intended to provide an assembly inspection device for a workpiece.

(Means for Solving Problems) In order to solve such problems, the present invention provides a preload adjustment for a work that is a gear box that is assembled with an input shaft and an output shaft and is conveyed by a conveying device. After measuring the rotational rigidity of the output shaft and the friction torque of the input shaft, the input shaft is fixed to adjust the backlash, the backlash of the output shaft is measured, and the assembly condition of the work is inspected. And a positioning device for positioning the work on the transfer device, and a rotational rigidity of the output shaft of the positioned work, which is reciprocally movable in the transfer direction of the work and is provided so as to come in contact with and separate from the output shaft side of the work. A rotational rigidity measuring device that measures the The friction torque measuring device for measuring the friction torque of the input shaft of the positioned work after the preload adjustment based on the above, and the friction torque measuring device for reciprocating in the conveying direction of the work and contacting with and separating from the output shaft side of the work. A backlash measuring device that measures the backlash of the output shaft of the positioned work after preload adjustment based on the measurement by the torque measuring device, and can be reciprocated in the work transfer direction and can be moved toward and away from the work input shaft side. Is installed in the backlash measurement device,
And an input shaft fixing device for fixing the input shaft of the positioned work.

(Operation of the Means) According to the present invention, the work, which is the assembled gear box, is positioned by the positioning device while being transferred by the transfer device. With respect to the positioned work, various assembly inspection devices provided so as to be reciprocally movable in the work transport direction and capable of coming into contact with and separating from the output shaft or the input shaft of the work respectively come close to each other to inspect the work assembly state. To do.

That is, first, the rotational rigidity measuring device approaches the output shaft of the positioned workpiece to measure the rotational rigidity of the output shaft, and preload adjustment is performed based on the result. Next, the friction torque measuring device approaches the input shaft of the work to measure the friction torque of the input shaft, and preload adjustment is performed based on the result. After the preload adjustment is completed, the input shaft fixing device approaches the input shaft of the work to fix the input shaft, and the backlash measuring device approaches the output shaft of the work to prevent the backlash of the output shaft. The backlash is adjusted based on the measurement result. The work after the backlash adjustment and the inspection of the assembled state is released from the positioning by the positioning device, and is conveyed to the next process.

(Example) The present invention will be described in more detail with reference to the drawings showing an example of the embodiment.

FIG. 1 is a transverse sectional view of a rear steering gear box device for mechanical four-wheel steering, which is a functional component assembled by the method of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 5 to FIG. 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. FIG. 8 is a diagram showing a 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. 1, and an eccentric shaft 3 is projectingly provided from the flange 2.

On the eccentric shaft 3, a cylindrical member 6 integrally provided with a pinion 4 at a front portion and a circular eccentric cam 5 at a rear portion 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 integrally fixed to the center of the output shaft 9 with the bolt 12 by the tubular portion 11, and the output shaft 9
Female taper surfaces 14, 14 facing forward are formed on the facing surfaces of the two right and left vertical wall portions 13, 13 projecting forward.

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, 18 facing rearward are formed on the side surfaces of the left and right vertical wall portions 17, 17 of the engaging member 16.

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 and 14 as shown in FIG. The rollers 20 ..., 20 ... which are horizontal are respectively interposed.

The central part of the input shaft 1 and the output shaft 9 described above is placed in a box 21,
Holder with front and left and right parts integrally formed with pipes 22, 23, 23
Support at 24. That is, with the engaged member 10 facing the box 21 of the holder 24, the output shaft 9 is horizontally slidably supported in the left and right pipes 23, 23 by the metal bearings 25, 25. The eccentric shaft 3 faces the box 21 and the engaging member
16 is engaged with the engaged member 10 via rollers 20, ..., 20, and the input shaft 1 is rotatably supported in the front pipe 22.

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. The step portions 30, 30 are formed, and the adjustment bolts 31, 31 screwed from the up and down direction of the box 24 are applied to the step portions 30, 30. Further, a large number of recesses 32 ... Penetrating in the axial direction are provided in the outer peripheral portions of both ring gears 27, 27, and a rubber coupling member 33 is contracted in the recesses 32 in the circumferential direction to provide a rotatable gear 27. Preload.

Specifically, the input shaft 1 is supported by the flange 2 at the rear end.
A ring 35 is mounted on the front part of the pipe via balls 34, and a contact type angular bearing is provided, and the ring 35 is fitted to the inner circumference of the base end part of the pipe 22. Then, apply the thrust washer 36 to the front end of the ring 35, insert the disc spring 37, and
The disc spring 37 is contracted via 38 to preload the ring 35 to urge it rearward. Furthermore, a lock nut 39 is attached to the pipe 22.
Screw on. Further, a seal cap 40 was capped on the front end of the pipe 22, and a bearing 42 held by a retainer 41 installed in the cap 40 was interposed between the collars 38.

After being assembled in this way, this gear box device is further assembled by connecting tie rods (not shown) for rear wheels to 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 a preload adjustment performed by pressurizing the cap 40 shown in FIG. 1 by tightening, and a backlash adjustment performed by tightening adjusting 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 output shaft 9
Since the backlash also changes depending on the preload adjustment, the preload adjustment must be performed before the backlash adjustment. Here, the backlash of the output shaft 9 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 range of the rotation angle 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.

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 appropriate range of friction torque is set in advance, the predetermined range is rotated to measure the friction torque during that period, and it is inspected to determine whether the torque falls within this range and preload adjustment is performed.

In this preload adjustment, the rotational rigidity of the output shaft is adjusted as described above, the friction torque is then adjusted, and the 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, a predetermined proper displacement amount range is set in advance, a predetermined load is applied, the displacement amount is measured, and whether the displacement amount falls within this range is inspected and determined to perform backlash adjustment.

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 FIG.

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
Is conveyed to a floating positioning table 47 by a spring 48 as shown in FIG. 7, fixed by a pallet positioning jig (not shown), and then floated to the pallet.
51 loads are offset. 45 and 45 are lifting devices for the pallet 51, and 46 is a device for lowering the positioning table 47 when the pallet 51 is loaded.

A first table 53 that reciprocates by a cylinder 52 is provided along one side (upper side in FIG. 6) of the pallet conveyor 50 at a position where the gear box device A is assembled and conveyed in the state shown in FIG. The table 53 is provided with a pair of second and third tables 54 and 55 that can be freely attached to and detached from the pallet 51. The second table 54 on the upstream side of the conveyor 50 is provided with a rotational rigidity measuring device configured to measure the rotational rigidity of the output shaft 9 and including a clamp unit 56, a torque load unit 57, and an angle measuring unit 58. There is. That is, a clamp unit 56 for clamping and fixing the gear box device A is provided in the center of the second table 54 during preload adjustment, and a predetermined torque is applied to the output shaft on the left side of the unit 56 in FIG. The torque load unit 57 for adding the angle measuring unit for measuring the rotation angle of the output shaft on the right side.
58 was set up. A backlash measuring device including a clamp unit 59, a displacement amount measuring unit 60, and a load unit 61 is provided on the third table 55 on the downstream side of the conveyor 50. That is, in the center of the third table 55, a clamp unit that clamps and fixes the gear box device A during the backlash adjustment.
59 is provided, a unit 60 for measuring the amount of displacement of the output shaft is provided on the left side thereof, and a load loading unit 61 for applying a predetermined load to the output shaft along the axial direction thereof is provided on the right side thereof.

The other side of the pallet conveyor 50 (lower side in FIG. 6)
A fourth table 62 is provided reciprocally along the input shaft 1 for adjusting the preload on the upstream side of the fourth table 62.
A friction torque measurement unit 63 that measures the friction torque at that time by rotating the
And an input shaft fixing unit 64 for fixing the input shaft at the time of backlash adjustment is provided on the downstream side of the fourth table 62.

A CRT and a printer 65 for displaying each measurement result are provided above the first table 53 in FIG.

 The operation of this embodiment will be described below.

First, as shown in FIG. 6, the gear box device A assembled as shown in FIG. 1 makes the output shaft 9 parallel to the conveying direction and the pallet 51 with the input shaft 1 facing the fourth table 62 side. Mounted on the floating positioning device 49
When the pallet 51 is conveyed to the position of, the pallet 51 is fixed and positioned by the positioning device 49. At this time, the friction torque measuring device 63 on the fourth table 62 faces the gear box device A.

Next, the cylinder 52 moves the first table 53 to the transfer device 50.
Then, the second table 54 is opposed to the pallet 51 by moving the second table 54 closer to the pallet 51, and the gear box device A is clamped and fixed by the clamp unit 56. And the floating positioning device 49
To float the pallet 51. After that, the torque load unit 57 and the rotation angle measurement unit 58 are attached to the output shaft, the rotation angle at a predetermined torque is measured, and the measurement result is CRT65.
The preload adjustment is performed by adjusting the cap 40 shown in FIG. 1 so that the rotation angle falls within a predetermined range while making a determination. After this is completed, the input shaft is connected to the friction torque measuring unit 63 of the fourth table 62, the input shaft is rotated within a predetermined range by the unit 63, the friction torque during that period is measured, and the measurement result is judged by the CRT65. Meanwhile, the preload adjustment is performed by adjusting the cap 40 so that the torque falls within a predetermined range.

Next, the clamp of the clamp unit 56 is released, the second table 54 is moved, and the third table 55 is further moved to the pallet.
Move to the position facing 51. Again, the pallet 51 is positioned and fixed by the floating positioning device 49, the gear box device A is clamped and fixed by the clamp unit 59, and then the pallet 51 is floated in the same manner as described above. 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 Judging by CRT65, the adjustment bolt 31 is adjusted so that the displacement amount falls within a predetermined range, and the backlash adjustment is performed. 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-mentioned assembling process is illustrated in FIG.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the assembled work is positioned and fixed by the positioning device during the transportation of the transport device, and various assembly inspection devices are brought close to the assembly state. As it is inspected, each assembly state is inspected and adjusted until the specified performance is satisfied without moving the work from the transfer device which is an assembly line, and after the completion of all inspections, the positioning device is released and transferred to the next process. can do.

Also, in the inspection of the assembly state of the work that is the gear box, the preload adjustment is performed based on the rotational rigidity measurement of the output shaft, and then the preload adjustment is performed based on the friction characteristic measurement of the input shaft, and then the backlash is measured. Backlash adjustment can be performed. Therefore, after the preload adjustment that affects the play of the output shaft, the backlash of the output shaft can be properly adjusted by the backlash adjustment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a rear steering gear box device for mechanical four-wheel steering, which is a functional component assembled by the method of the present invention, and FIG. 2 is II-II of FIG. Line cross section,
3 to 5 are line diagrams for explaining each assembly adjustment,
FIG. 6 is a schematic view of the main part of the assembly line of this embodiment, FIG. 7 is a sectional view of the main part of FIG. 6, and FIG. 8 is a work procedure in the assembly line of FIGS. 6 and 7. FIG. 49 …… Positioning device, 50 …… Transfer device, 56 …… Clamp unit, 57 …… Torque load unit,
58 …… Angle measurement unit, 59 …… Clamp unit, 60
…… Displacement measurement unit, 61 …… Load load unit, 63 …… Friction torque measurement unit, 64 …… Input shaft fixed unit

Claims (1)

[Claims] 1. A work, which is a gear box assembled with an input shaft and an output shaft and conveyed by a conveying device, measures rotational rigidity of the output shaft and friction torque of the input shaft for preload adjustment, and then back An assembly inspection device for fixing the input shaft for lash adjustment, measuring the backlash of the output shaft, and inspecting the assembly state of the work, the positioning device for positioning the work on the transfer device, and the transfer of the work. A rotational rigidity measuring device that is reciprocally movable in the direction of the workpiece and that is movable toward and away from the output shaft side of the workpiece, and that measures the rotational rigidity of the output shaft of the positioned workpiece, It is installed on the input shaft side so that it can be freely moved in and out, and after preload adjustment based on the measurement by the rotational rigidity measuring device, the position of the input shaft of the positioned workpiece is adjusted. A friction torque measuring device that measures the friction torque and a reciprocating device in the workpiece conveying direction, and is provided so as to come in contact with and separate from the output shaft side of the work, and the positioning is performed after preload adjustment based on the measurement by the friction torque measuring device. The backlash measuring device for measuring the backlash of the output shaft of the work, and the reciprocating movement in the conveying direction of the work and the contacting and separating to the input shaft side of the work are provided. An assembly inspection device for a work, comprising: an input shaft fixing device for fixing an input shaft of a positioned work.