JP2810382B2 - Brake shoe centripetal adjustment device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a brake shoe centering adjustment device that corrects a brake shoe to a proper position before assembling a drum when assembling a drum type brake.

(Prior art and its problems) Drum type brakes are assembled in the order of assembling a pair of brake shoes, which are constituent elements thereof, and then assembling a brake drum.

By the way, a pair of brake shoes is usually made to have a diameter slightly smaller than the inner diameter of the drum, even if the diameter is reduced to the maximum. The clearance is very small. Therefore, it is necessary to adjust the centering of the brake shoe before assembling the drum. That is,
If the brake shoe is displaced from the proper position, the drum may interfere with the brake shoe when assembling the drum, causing a problem that these elements are damaged. In particular, when automating the mounting of the drum, it is difficult to find out even if the drum is mounted while damaging the brake shoes.

As one example of a centering device for a brake shoe, a jig provided with the same curved surface as the outer surface of the brake shoe so as to sandwich a pair of brake shoes from the outside is known as one of the conventional examples.

According to this conventional example, since the centering adjustment is performed while grasping the brake shoe in a plane, there is an advantage that the centering adjustment can be accurately performed regardless of how the brake shoe is displaced. However, on the other hand, since one model is a dedicated machine such as one centripetal adjustment device, there is a drawback that there is no versatility for brake shoes having different curvatures. For this reason, every time there is a brake design change, there is a problem that a dedicated centripetal adjustment device must be recreated, and there is a problem that it is difficult to apply it to mixed production of a plurality of models. ing.

Another conventional example is disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-171035. This centripetal adjustment device, a pair of rollers arranged corresponding to the longitudinal direction both ends of the brake shoe,
The brake shoe is moved from the outside of the brake shoe to a predetermined position on the circumference having a diameter slightly smaller than the inner diameter of the drum and fixed, and then the centering adjustment of the brake shoe is performed by expanding the diameter of the brake shoe. According to this device, it is possible to cope with a plurality of types of brakes by changing the amount of movement of the pair of rollers (the fixed position of the rollers).

However, in order to increase the diameter of the brake shoe and adjust its centripetal adjustment in this way, it is, of course, necessary to add a mechanism for expanding the diameter of the brake shoe to the centripetal adjustment device. By the way, in the device disclosed in the same publication, a ratchet is provided on an adjuster as a clearance adjusting mechanism of the brake shoe, and the diameter of the brake shoe is increased by driving a gear that meshes with the ratchet. ing. As described above, if the centripetal adjustment device is provided with the gear and the means for driving the same, the device becomes complicated accordingly, and when the ratchet and the gear do not mesh properly, the product of the brake, Damage to components. Even if it is possible to cope with many types of brakes, it is necessary to adjust the amount of movement (fixed position) of the roller for each model, so it is necessary to additionally provide an adjustment mechanism for that. From this point, there is a problem that the centripetal adjustment device is complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brake shoe centering device which has a simple configuration and can handle many types of brakes.

(Means for Solving the Problems, Operation) The present invention reviews the centripetal adjustment device from the centripetal point of the brake shoe, and if the brake shoe is located on a circle centered on the centripetal point, it will be remedied. This means that the centering adjustment of the brake shoe has been properly performed, and it is based on the idea that no interference will occur when the drum is assembled.

That is, in the present invention, as shown in FIG. 1, the brake shoes are provided corresponding to each of the pair of brake shoes, and are disposed at both ends in the longitudinal direction of the brake shoes so as to face from the outside. A pair of rollers, a distance between one of the pair of rollers and the center point of the brake shoe, and a distance between the other roller of the pair of rollers and the center point of the brake shoe. A first driving unit for displacing and moving the pair of rollers in a direction of pressing the brake shoe while maintaining the distances equal, and a separation distance between each of the pair of rollers and a centripetal point of the brake shoe. And a second driving means for slightly displacing the pair of rollers in the longitudinal direction of the brake shoe while pressing the brake shoe from the outside while maintaining the same.

According to the above configuration, since both ends in the longitudinal direction of the brake shoe 1 are pressed by the rollers 2, the brake shoe 1 can be pressed radially inward regardless of the curvature of the brake shoe 1. However, the distance 1 between one roller of the pair of rollers and the center point of the brake shoe, and the distance 1 between the other roller of the pair of rollers and the center point of the brake shoe, The direction X in which the brake shoe 1 is pressed from the outside while keeping the same.
, The brake shoe 1 cannot be centered by itself. This point will be described in detail with reference to FIG. 1. As shown by a solid line in the drawing, the brake shoe 1 is generally "displaced" up and down, so that the roller 2 is simply moved in the X direction. Even if it is displaced, only one roller 2 presses the brake shoe 1 as shown in FIG. In other words, there is no action until the vertical "shift" of the brake shoe 1 is corrected. In order to correct the vertical misalignment of the brake shoe 1, it is necessary to physically apply a vertical force to the brake shoe 1 in the drawing. For this reason, in the present invention, the roller 2 is slightly displaced in the longitudinal direction Y of the brake shoe 1 while the brake shoe 1 is pressed from the outside. A vertical force is applied to the brake shoe 1 by the displacement movement of the roller 2 in the Y direction. As a result, the brake shoe 1 is adjusted to a normal position, that is, a centering adjustment located on a circumference Z centered at the centering point O. Will be completed.

Even if the brake shoes 1 are of different models, the roller 2 presses the brake shoes 1 in the X direction in the operating state, so that the displacement amount of the roller 2 in the X direction is particularly set. No need. Therefore, even if the brake is of any type, it is possible to sufficiently cope with the brake without particularly changing the operation state of the centripetal adjustment device.

The roller 2 applies the force in the illustrated vertical direction Y to the brake shoe 1.
The rolling of the roller 2 does not damage the lining (not shown).

(Embodiment) FIG. 2 shows an assembly line of a brake system, in which L1 shows an assembly line relating to a brake drum, and L2 shows an assembly line of a drum type brake. The brake drum 3 that has passed through the cleaning machine 10 is carried into the line L1, and bearings and the like are assembled to the brake drum 3 at the station S1 of the line L1. The brake drum 3 on which the various elements have been assembled in this way is a pallet that travels on the line L2 by the conveyor 11.
Transferred on 12.

The line L2 is provided with stations S2 to S7 and the like from the upstream side to the downstream side. At the station S2, the brake shoe 1 is mounted on the drum 3 and at the station S3, the brake system is locked. The nuts are tightened and the diameter of the brake shoe 1 is increased by air. At the station S4, the work of tightening the lock nuts is performed, and at the station 5, the work of caulking the lock nuts is performed. At the station 6, the brake and the suspension are assembled, and the assembled assembly is carried out of the station S7 to the outside.

As shown in FIG. 3, the station S2 is provided with a centering adjusting device 20 for centering the brake shoe 1, and a set of the spindle support and the brake shoe 1 mounted on the area 14 adjacent thereto. The three-dimensional object W is mounted on the centripetal adjustment device 20, and the centripetal adjustment of the brake shoe 1 is performed. The assembly W after the centripetal adjustment is assembled to the brake drum 3 on the pallet 12 by the transfer device 15. Hereinafter, the transfer device 15 and the centripetal adjustment device 20 will be described in detail with reference to the drawings after FIG.

3 and 4, the transfer device 15 has a guide rail 151 that crosses the conveyor 11 above the station S2, and a main body 152 guided by the guide rail 151.
Is movable in a direction crossing the conveyor 11 by a cylinder 153. The main body 152 can be moved up and down by a second cylinder 155, and the main body 152 has a pair of clampers 154 extending vertically. The clamper 154 has an intermediate portion in the longitudinal direction through a support shaft 156,
A third cylinder 157 is mounted on the upper end of the clamper 154, and the third cylinder 157 is extended or shortened so as to extend the clamper 154.
Is adapted to be scaled at its lower end. At the lower end of the clamper 154, claws 1589 extending opposite to each other are provided. On the other hand, as shown in FIG.
The assembly W is provided with a hole 159 for receiving
It is to be sandwiched by 54.

As shown in FIGS. 6 and 7, the centripetal adjustment device 20 has a base 200 and a movable base 201, and
1 is provided on a moving base 213 which is guided by a rail 200a fixed to the upper end of the base 200 and moves in the front-back direction of the paper,
It is rotatable about a vertical axis h in a horizontal plane, and is driven by a second cylinder 202. The movable base 201 is provided with a spindle support 203 extending vertically up and down coaxially with the vertical axis h, and the spindle support 203 is rotatable by a bearing 204,
The lower end is connected to a first cylinder 206 via a link 205, and the cylinder 206 is fixed to the movable base 201. An upper end portion of the spindle support 203 is a spindle support portion 203a that opens upward, and the assembly W is mounted on the spindle support portion 203a coaxially with the vertical axis h so that the centering adjustment device 20
It is designed to be attached to. Spindle support 20
3 also has a first link 20 via a support shaft 208.
The first link 209 has a shaft 211 attached to the outer end of the first link 209 via a bearing 210. One end of a second link 212 is integrally attached to the shaft 211, and the roller 2 is rotatably attached. The other end of the second link 212 is
It is attached to the movable base 201 via the bracket 214. The attachment structure at the other end of the second link 212 will be described later in detail.

In this case, five rollers 2 are provided at intervals on the same circumference centered on the vertical axis h, and these rollers 2 are both of the first link 209 having substantially the same length. The first link 209 is attached via a second link 212. The attachment points at the inner ends of the first links 209 are arranged on the same circumference centered on the vertical axis h.
The attachment points at the other end of the roller 2 are arranged on the same circumference centered on the vertical axis h, and when the spindle support 203 is rotated, as shown in FIG. Are displaced by the same amount.

The centripetal adjusting device 20 also has a detent means 220 for restricting the rotation of the assembly W as shown in FIG. 8, and the detent means 220 engages with the pin P of the assembly W. Engagement plate 2
21 and a tension spring 222, the engagement plate 221 is attached to the base 200 via a bracket 223. More specifically, the engagement plate 221 is rotatable up and down around a shaft 224, and a recess 221a is formed at the tip of the engagement plate 221 (see FIG. 6). It is adapted to be engaged with the portion P. Then, the tension spring 222
Is extended between the engagement plate 221 and the bracket 223, and when the engagement plate 221 is engaged with or disengaged from the pin P by the tension spring 222, the state is maintained. It has become so. The engagement plate 221 is provided with a lever 225, and when the operator operates the lever 225, an engagement or non-engagement state between the engagement plate 221 and the pin portion P is generated.

In the above configuration, the operator mounts the assembly W on the centripetal adjustment device 20, and then operates the lever 221 to fix the assembly W. Thereafter, the operation of the first cylinder 206 is started, the spindle support 203 is rotated clockwise in FIG. 6, and the five rollers 2 are displaced radially inward (see FIG. 9). The reason why the five rollers 2 are provided here is that the arrangement of the brake shoes 1 is different between the assembly W for the right wheel and the assembly for the left wheel. For example, the arrangement of FIG. In the case of the assembly W for the left wheel, the arrangement is shifted by 90 degrees. Also, the brake shoes 1 indicated by broken lines in the figure indicate the brake shoes 1 of the assembly W of different models.

Due to the radially inward displacement movement of the roller 2, each end of the brake shoe 1 in the longitudinal direction is pressed from the outside, and the brake shoe 1 is brought into a state shown by a solid line in FIG. The operation of the first cylinder 206 is continued thereafter, and the brake shoe 1 is kept pressed by the roller 2. Then, while this pressed state is maintained, the second cylinder 202 expands and contracts by a predetermined stroke, and the roller 2 reciprocates once in the Y direction in FIG. 1 with a small movement amount (see FIG. 10).

By the above operation, the displacement of the brake shoe 1 is corrected, and the brake shoe 1 assumes a normal position as shown in FIG. Thereafter, the roller 2 is displaced radially outward and returns to the original position (broken line). The assembly W subjected to the centripetal adjustment in this manner is mounted on the drum 3 on the pallet 12 by the transfer device 15. The station S2 is provided with positioning means 30 below the conveyor 11, and the positioning means 30 positions the drum 3 on the pallet 12 at a predetermined position (see FIG. 4).

12 and 13 show the second link 212 and the bracket 2
14 shows a mounting structure of 14, wherein the second link 212 is mounted on a bracket 214 via an eccentric shaft 230. That is, the eccentric shaft 230 has its head 230a
And the shaft 230b are eccentric by δ (1 mm in the embodiment). The head portion 230a of the eccentric shaft 230 has a total of 14 recesses 230c formed at equal angles around its circumference, and the eccentricity δ is adjusted by appropriately changing the recesses 230c that engage with the bolts 231. It is possible. In this embodiment, two bolt holes 232 into which the bolts 231 are screwed are provided, and by changing the bolt holes 232 into which the bolts 231 are screwed, the eccentric shaft 230 can be moved at its eccentric position in 28 divided units. Can be adjusted. By adjusting the amount of eccentricity δ of the eccentric shaft 230 in this manner, the length of the second link 212 is substantially changed, and as a result, the amount of displacement of the roller 2 inward in the radial direction can be adjusted. It is said.
Accordingly, when the position of each roller 2 is shifted from the same circumference due to friction of the roller 2 or the like, the correction can be performed by appropriately adjusting the eccentric position of the eccentric shaft 230.

As described above, one embodiment of the present invention has been described. According to this embodiment, since each roller 2 is displaced radially inward by one cylinder 206 via the links 209 and 212, each roller 2
, And the uniformity of the displacement and its displacement can be reliably assured. Similarly, since the rollers 2 can rotate relative to the assembly W by rotating the movable base 201 on which the rollers 2 and the like are mounted, the rollers 2 are synchronized in the circumferential direction. It is possible to reliably guarantee the amount of displacement, and it has the advantage that only one cylinder 202 is required to drive it. Roller 2
Are arranged at both ends in the longitudinal direction of the brake shoe 1 so that the brake shoe 1 can be adapted to brake shoes 1 having different diameters, and the roller 2 always presses the brake shoe in the operating state. Even if the brake shoes 1 have different diameters, there is an advantage that it is not necessary to set the radially inward displacement amount of the roller 2 each time.

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to adjust the centering of any type of brake with a simple configuration without setting a special operation state. .

[Brief description of the drawings]

FIG. 1 is an explanatory view of the operation of the present invention, FIG. 2 is an overall configuration diagram of a brake assembly line in which a centering adjustment device is arranged, FIG. 3 is a plan view of an assembling station for a brake shoe and a brake drum, FIG. The figure is a side view of an assembling station for a brake shoe and a brake drum, FIG. 5 is a schematic configuration diagram of a clamper, FIG. 6 is a plan view of a centripetal adjustment device, and FIG. 7 is a cross-sectional view of FIG. Fig. 8 is a side view showing details of the rotation preventing means of the assembly W, Fig. 9 is an explanatory view of the operation of the roller pressing the brake shoe, and Fig. 10 is the displacement movement in the roller direction with the brake shoe pressed. FIG. 11 is a view showing a state where the centering adjustment of the brake shoe is completed, FIG. 12 and FIG. 13 are detailed views of a roller position adjusting mechanism, 1: brake shoe 2: roller 3: brake drum 20 : Centering adjustment device 202: Second driver Step 206: first driving means W: assembly

Claims (1)

(57) [Claims] 1. A pair of rollers provided corresponding to each of a pair of brake shoes, and disposed at both ends in the longitudinal direction of the brake shoes from outside thereof, and one of the pair of rollers. Pressing the brake shoe while keeping the distance between the roller of the pair and the centripetal point of the brake shoe equal to the distance between the other roller of the pair of rollers and the centripetal point of the brake shoe. First driving means for displacing and moving the pair of rollers in the direction, and pressing the brake shoe from the outside while maintaining the same separation distance between each of the pair of rollers and the centripetal point of the brake shoe. And a second driving means for slightly displacing the pair of rollers in the longitudinal direction of the brake shoe in a state, and a centering adjustment device for the brake shoe.