JPH0729443Y2 - Backlash measurement jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a backlash measuring jig used for measuring a clearance between tooth surfaces when a pair of gears are meshed with each other. .

[Conventional technology]

For example, a differential gear arranged in a power transmission path of an automobile uses a pair of bevel gears that are orthogonally meshed with each other. Conventionally, the clearance between the tooth surfaces of this meshed bevel gear, that is, the backlash, has been measured in the following manner.

As shown in FIG. 4, in the pair of bevel gears, one small gear (1) is rotatably and vertically supported, and
The other large gear (2) is rotatably and horizontally supported, and both gears (1) and (2) are meshed in an orthogonal state. Then, as shown in FIG. 5 (a), first, the center of the tooth portion (1a) of the small gear (1) is located on the straight line (a) connecting the center points of the meshed gears (1) and (2). Position and the small gear (1) is fixed, the large gear (2) is rotated in the forward and reverse directions to generate a clearance (l) between the tooth surfaces of both gears (1) and (2). Is measured with a dial gauge to obtain the first backlash. Next, as shown in FIG. 5 (b), with the large gear (2) fixed with the center of the tooth portion (2a) of the large gear (2) positioned on the straight line (a), The gear (1) is rotated in the forward and reverse directions, and the clearance (l ') between the tooth flanks of both gears (1) and (2) generated during rotation is measured with a dial gauge to obtain the second backlash. . In this way, the quality can be improved by accurately measuring and managing the numerical value of the adjacent backlash of the backlash measured with the small gear (1) and the large gear (2) as a reference.

It should be noted that as a known technique of the backlash adjusting device, there has been disclosed in
There is one described in JP-A-62-62058.

[Problems to be solved by the device]

According to the conventional example, at the time of measuring the above-mentioned first and second backlash, the operator visually checks the both gears (1).
On the straight line (a) connecting the center points of (1), each gear (1)
Since the centers of the tooth portions (1a) and (2a) of (2) were located, it was difficult to accurately locate the centers of the tooth portions (1a) and (2a) on the straight line (a). . Therefore, there is a problem that the backlash measurement values vary, and the adjacent backlash becomes extremely inaccurate.

[Means for Solving the Problems]

The present invention has been proposed in view of the above problems, and has first and second gear holding portions each having a gear holding portion at its tip, and rotatably holding a pair of gears meshed with each gear holding portion. Second
Of the gear holder and the gear holder of one of the first and second gear holders so as to be movable back and forth with respect to the gear holder and at a predetermined angle. ,
It is arranged at a position of a predetermined angle, and at the tip thereof is formed a positioning protrusion that enters between the teeth of one of the gears held by the gear holding portion. Fixing the one gear by individually inserting the tip projections of the first and second fixing rods between the tooth portions of the one gear held by the gear holding portion, and the groove portion and the tooth of the other gear. The center of the tooth portion and the groove portion of the tooth portion of one of the gears facing each other is individually positioned and held on a straight line connecting the center points of both gears.

[Action]

After the paired gears are meshed with the first and second gear holders and held rotatably respectively, the tip ends of the first and second fixing rods are, for example, One of the held gears is individually inserted between the gears to fix the one gear, and on the straight line connecting the center points of both gears, the groove of the other gear and the gear of the one gear facing the tooth are Position and hold the center of the tooth or groove. Then, the backlash of the pair of gears is measured by rotating the other gear held by the second gear holder.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the drawing, (11) is a base having a mounting hole (12) formed in a predetermined position in a vertical direction, (13) is a first gear holder, and (1)
4) is a second gear holder, and (15) and (15 ') are first and second gear fixing means for positioning and fixing the small gear (1) of the bevel gears.

In the first gear holder (13), (16) is the base (1)
A fixed bracket having an L-shaped cross section fixed to the upper part of the fixed bracket (16) has a mounting hole (18) horizontally formed at an upper end of a rising portion (17) of the fixed bracket (16). Reference numeral (19) is a holding cylinder having a through hole (20) penetratingly fixed to the mounting hole (18) of the fixing bracket (16), and the holding cylinder (19) has a leading end of the fixing bracket (16). It has an umbrella-shaped collar portion (21) that abuts the front surface of the portion (17), and a through hole (2) is formed in the tip end surface (22) that abuts the back surface of the pinion gear (1).
0) and an arcuate surface (23) which is concentrically formed with the same. (2
Reference numeral 4) is a holding shaft that is penetratingly held in the through hole (20) of the holding cylinder (19) so as to be movable in the axial direction, and the holding shaft (24) vertically holds the small gear (1) at the protruding portion of the tip. Gear holding part (2
5) is provided, and the end face of the gear holding part (25) is projected concentrically in stages, and the step part (27) and the nut (28) into which the spacer (26) is fitted are screwed together. Small diameter screw part (2
9) and the screw portion (30) is formed at the rear end. (31) is a cylindrical cover having a flange (32) formed at the front opening end, and the flange (32) of this cover (31) is screwed to the rear surface of the rising portion (17) of the fixing bracket (16). Screwed by (33), the rear shaft part (24a) of the holding shaft (24)
And the rear end shaft portion (24a) of the holding shaft (24) penetrates the rear end wall (31a) of the cover (31) and is projected rearward. (34) is a tightening handle screwed to the rear end screw part (30) of the holding shaft (24) through a spacer (35).

In the second gear holder (14), (36) is the base (11).
The mounting cylinder inserted into and fixed to the mounting hole (12) is a holding cylinder fixed to the mounting cylinder (36) by being inserted and fixed. The holding cylinder (37) has a through hole ( 38) and also has a flange (39) on its outer peripheral surface that abuts against the upper end surface of the mounting cylinder (36), and the upper end above the flange (39) is directed upward. A tapered portion (40) is provided by forming it in a tapered shape. The through hole (38) of the holding cylinder (37) has a small diameter hole (38a) opening at the upper end surface in the upper part and a small diameter screw hole opening at the middle part of the lower large diameter hole (38b). (38c)
The upper small diameter hole (38a) and screw hole (38c)
A large diameter hole (38d) is formed between and. (41)
Is an annular mounting having a positioning hole (42) fixedly installed on the flange portion (39) of the holding cylinder (37) so as to concentrically surround the upper end tapered portion (40) of the holding cylinder (37). When the mounting table (41) is mounted with the large gear (2) horizontally on its upper surface and the protruding cylindrical portion (2b) of the large gear (2) is fitted into the positioning hole (42), , The large gear (2) is the first gear holder (1
It is arranged so as to mesh with the small gear (1) held in 3) at right angles. (43) is a chuck for fixing the large gear (2) mounted on the mounting table (41) from the inner peripheral surface side, and the chuck (43) has a screw portion (44a) at the lower end for rotation. It comprises a shaft (44) and a chuck body (45) mounted on the upper end of the rotating shaft (44) and having a plurality of claws which can be opened and closed by an appropriate means, for example, a nut tightening operation. There is. In the chuck (43), the rotary shaft (44) is axially movably inserted into the through hole (38) of the holding cylinder (37), and the lower end screw portion (44a) of the rotary shaft (44) is inserted.
Is screwed into the screw hole (38c), and the chuck body (45) is concentrically held in the through hole (2c) of the large gear (2) on the mounting table (41).

In the first and second gear fixing means (15) (15 '), (46) and (46') are located at a position orthogonal to the holding shaft (24), and the rising portion (1) of the fixing bracket (16).
Mounting plates fixed to the upper end surface (17a) and the upper side surface (17b) of 7) respectively. The mounting plates (46) and (46 ') are projected forward in parallel with the holding shaft (24) to hold the holding shaft ( The gear holding portion (25) of (24) is arranged around the gear holding portion (25), and through holes (47) (47 ') opening toward the gear holding portion (25) are formed at the front end thereof. (48) (48 ') is the above mounting plate (4
6) Guide sleeves inserted and fixed in through holes (47) (47 ') of (46'), and guide sleeves (48) of (49) and (49 ')
The first and second fixing rods are provided so as to pass through the (48 ') and are orthogonal to the gear holding portion (25) of the holding shaft (24) so as to be movable back and forth. 49)
(49 ') has a collar portion (50) (50') formed at an intermediate portion, and has a tip end of the small gear (1) held by the gear holding portion (25) of the holding shaft (24). Spherical positioning protrusions (51) (51 ') are formed between the teeth, which enter horizontally and vertically. (52) and (52 ') are concentric with the first and second rods (49) and (49') on the outer opening end faces of the through holes (47) and (47 ') of the mounting plates (46) and (46'). Is an outer cylinder fixed in a fixed shape, and includes rear end shaft portions (49) of the first and second fixing rods (49) and (49 ').
a) (49a ') is the rear end wall (53) of the outer cylinder (52) (52')
It penetrates through (53 ') and is projected rearward. (54)
The collar (54 ') is wound around the first and second fixing rods (49) (49') in the outer cylinders (52) (52 ') and is then fitted to the collar (50).
(50 ') and outer cylinder (52) (52') rear end wall (53) (53 ')
A compression spring compressed between the first and second fixing rods (49) (49 ') in the horizontal direction and the vertical direction by the spring force of the compression springs (54) (54'). It is biased toward the gear holding portion (25) of the holding shaft (24). In addition, the first and second fixed rods (5
9) (59 ') is a compression spring (5
4) It is held at the backward end against the urging force of (54). Reference numerals (55) and (55 ') denote operation handles fixedly attached to the rear end shaft portions (49a) and (49a') of the first and second fixing rods (15) and (15 '). These operation handles (55) ( Five
5 ') holding the first and second fixed rods (49) (4
9 ') is moved back and forth in the axial direction.

Next, the procedure for measuring the backlash using the jig according to the present invention will be described as follows. The first and second fixing rods (49) (49 ') of the first and second gear fixing means (15) (15') are the compression springs (54).
It shall be retained and held at the retracted end against the biasing force of (54 ').

The small gear (1) and the spacer (26) are fitted into the gear holding portion (25) and the step portion (27) of the holding shaft (24) constituting the first gear holder (13), and the small diameter screw portion is also included. (29)
After screwing the nut (28) onto the, tighten the handle (34).
The rear surface of the small gear (1) is brought into contact with the tip end surface (22) of the holding cylinder (19) by its reaction force, and the holding shaft (24) is
The small gear (1) is held by the gear holding portion (25). Further, the large gear (2) is mounted on the mounting table (41) of the second gear holder (14), and the protruding cylindrical portion (2b) of the large gear (2) is placed in the positioning hole (42). , And the small gear (1) and the large gear (2) are screwed in an orthogonal state,
The large gear (2) is chucked from the inner peripheral surface side by the chuck body (45) of the chuck (43). Then, first, the operation handle (55) of the first gear fixing means (15) is held to release the locked state of the first fixing rod (49). Then, the first fixed rod (49) moves horizontally toward the small gear (1) by the spring force of the compression spring (54), and the positioning projection (51) at the tip of the first fixed rod (49) is shown in FIG. As shown in Fig. 5, the pinion (1) is positioned and fixed by fitting into the groove (1b) located on the horizontal line (b) passing through the center point of the pinion (1), Prevents rotation in the direction.
At this time, on the straight line (a) connecting the center points of the small gear (1) and the large gear (2), the tooth portion (1a) of the small gear (1) facing the groove (2c) of the large gear (2). The center of is retained. When the small tooth (1) is thus positioned and fixed by the first fixing rod (49), the large gear (2) chucked by the chuck (43) is rotated around the rotation shaft (44) in the axial direction. The small gear (1) and the large gear (2) are moved to each tooth (1a) (2b).
And a gap (1) between the tooth portions (1a) and (2a ') generated at the time of the collision is measured with a dial gauge to obtain the first backlash. When the first backlash is calculated in this way, the first handle rod (49) is held against the spring force of the compression spring (54) by holding the operation handle (55) of the first gear fixing means (15). The positioning portion (51) of the first fixed rod (49) is pulled out from the groove portion (1b) of the small gear (1) by retracting and retaining and holding the retracting end.

Next, the operation handle (5) of the second gear fixing means (15 ')
5 ') to release the locked state of the second fixing rod (49'). Then, the second fixed rod (49 ') moves vertically toward the small gear (1) by the spring force of the compression spring (54'), and the positioning projection (51 ') at the tip thereof is
As shown in FIG. 3 (b), it fits into the groove (1b ') of the small gear (1) located on the straight line (a) connecting the center points of the small gear (1) and the large gear (2). Then, the small gear (1) is positioned and fixed to prevent the small gear (1) from rotating in the direction around the axis. At this time, the center of the groove portion (1b ″) of the small gear (1) facing the tooth portion (2a) of the large gear (2) is located on the straight line (a).
When it is positioned and fixed by the fixing rod (49 ') of the small gear (1), the large gear (2) chucked by the chuck (43) is rotated around the rotation shaft (44) in the axial rotation direction to rotate the small gear (1). ) The tooth portion (1a ′) of () is made to abut the tooth portion (2a) of the large gear (2), and the gap (l ′) between the tooth portions (1a) (2a) generated at this abutment is measured with a dial gauge. And seek a second backlash. Then, the adjacent backlash may be obtained from the first and second backlashes.

In the above embodiment, the first and second fixing rods (49) and (49 ') do not necessarily have to be disposed orthogonally to each other, and the center of the tooth portion and the groove portion of the small gear (1) are not The gears (1) and (2) may be arranged at a position of a predetermined angle so that they can be positioned on a straight line connecting the center points of the gears (1) and (2). Further, in the above embodiment, the small gear (1) is positioned and fixed by the first and second gear fixing means, and the large gear (2) is rotated, but the large gear (2) is reversed. The positioning and fixing may be performed, and the pinion (1) may be rotated.

Further, in the above embodiment, the case of a pair of bevel gears has been described, but the present invention is not limited to the above embodiment, and in the case of measuring backlash of various gears such as a pair of spur gears. It can also be widely applied to.

[Effect of device]

According to the present invention, among gears forming a meshed pair, by fixing one gear individually with the first and second fixing rods, the gear of one gear facing the groove portion and the tooth portion of the other gear is Since the centers of the tooth portion and the groove portion can be reliably positioned and fixed on the straight line connecting the center points of the paired gears, by rotating the other gear, the backlash of the paired gears can be accurately corrected, In addition, it is possible to perform quick measurement, and the backlash measurement value does not vary. Therefore, the adjacent backlash can be obtained very accurately.

[Brief description of drawings]

1 is a side sectional view showing an embodiment of a jig according to the present invention, FIG. 2 is a plan sectional view showing a relationship between a first gear holder and a first gear fixing means, and FIG. 3 (a) ) (B) is a schematic explanatory view for explaining the procedure when backlash is measured using the jig according to the present invention. FIG. 4 is a sectional explanatory view showing a meshing state of a bevel gear, and FIGS. 5 (a) and 5 (b) are schematic explanatory views for explaining a conventional backlash measurement procedure. (1) (2) …… gear, (13) …… first gear holder,
(14) …… Second gear holder, (49) (49 ′) …… First
And the second fixing rod, (51) (51 ') ... Positioning projection.

Claims (1)

[Scope of utility model registration request] 1. A first gear holder and a second gear holder, each of which has a gear holding portion at its tip, and rotatably holds a pair of gears meshing with each gear holding portion. Around the gear holder of one of the gear holders of the second gear holder and the second gear holder, the gear holder is disposed at a predetermined angle position so as to be movable back and forth with respect to the gear holder, and at the tip. , A tooth of one of the gears held by the gear holding portion, which is composed of first and second fixing rods and the like having positioning protrusions that enter between the tooth portions of the one gear held by the gear holding portion. Center of the tooth portion and groove portion of one gear facing the groove portion and tooth portion of the other gear by individually inserting the tip projections of the first and second fixing rods between the portions to fix one gear Are individually positioned and held on the straight line connecting the center points of both gears. Backlash measurement jig according to claim.