JPH0454426Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a drag sensor that measures the resistance after the operating force of the disc brake of an automobile, etc. is released, that is, the rotational resistance of the disc rotor (also called a brake rotor), so-called drag torque. The present invention relates to a drag torque measurement jig used in torque measurement tests.

The above-mentioned "drag torque of the disc brake (hereinafter also simply referred to as drag torque)" is, for example, even after the braking operation of the disc brake is completed, that is, after the operating force of the disc brake is released (also referred to as the time of non-braking). This refers to the braking torque that occurs when the brake pads and the disc rotor do not have the specified clearance when not braking, and the brake pads do not meet the disc rotor.
This is the rotational resistance of the disk rotor when it is not completely separated from the rotor, expressed in terms of torque. However, even when not braking, a minimum amount of drag torque is generated due to the mass and bearings of the disc rotor.

Further, the drag torque fluctuates due to a change in the clearance between the disc rotor and the brake pad as the disc rotor rotates.

In addition, "drag torque measurement" is a test to see if the above-mentioned "drag torque" is occurring.Drag torque exceeding the above-mentioned minimum value increases the vehicle's driving resistance, so-called running resistance, and reduces fuel efficiency. This is to determine whether or not there has been a decrease in brake pad wear, an increase in the amount of wear on the brake pads, a decrease in durability, etc.

BACKGROUND TECHNOLOGY The conventional measurement method is to measure the drag torque of a disc brake while rotating a disc rotor using a measuring instrument such as a torque wrench or a push pull gauge.

Problems to be solved by the invention However, when measuring drag torque with these measuring instruments, there are the following problems.

(1) Differences in the position of the measurer's eyes may cause errors in reading the scale of the measuring instrument. (2) Differences in the rotational speed of the torque wrench or differences in the pulling speed of the push/pull gauge may cause errors in the measured values. Errors occur (3) Manually, the disk rotor cannot be rotated at a constant speed, so it is not possible to accurately measure torque fluctuations. (4) During measurement, the maximum and minimum values at which the drag torque fluctuates must be memorized. It is a heavy burden (5) It is necessary to measure several times in order to obtain an average value.In addition to the measuring instruments mentioned above, there is an electric torque measuring device for individual disc brakes, but this is large and does not fit into the vehicle body. Assembled disk
It is not suitable for brake drag torque measurement tests.

This idea solves the above problems and
The purpose of the present invention is to provide a drag torque measuring jig that can easily and accurately measure the drag torque of a brake.

Means and Effects for Solving the Problems The disc brake drag torque measuring jig of this invention comprises an attachment that has a pulley portion and can be attached to a disc rotor of an automobile or the like using a hub bolt; a transmission belt that is wound around a pulley; a measurement board that is separate from the attachment and is arranged approximately vertically in front of the transmission belt in a direction in which the transmission belt is unwound from the pulley; a rail installed substantially horizontally along the return direction; a guide movably provided along the rail; and a guide rotatably supported by the guide and an end of the transmission belt on the rewind side folded back. a motor having a floating pulley hung on the measuring board, and a drive pulley installed adjacent to the attachment side end of the rail on the measurement board and winding up the unwinding side end of the transmission belt via the floating pulley. a tension spring that is stretched between the measurement board and the guide and applies tension to the transmission belt; and a pair of tension springs that are installed on the measurement board parallel to the rail and that are horizontally slidable. a scale having a torque indicator piece; a needle fixed to the guide and having a tip thereof positioned between the torque indicator pieces;
It is equipped with

When performing measurements using the drag torque measuring jig, the measurement board is placed adjacent to the disc rotor of an automobile, etc., and the attachment that winds up the transmission belt around the pulley is attached to the hub bolt on the disc rotor. It can be installed using.
At this time, the guide is positioned so that the tip of the needle is located approximately in the middle of the scale, and
A pair of torque indicator pieces are arranged on both sides of the tip of the needle.

When the disc brake is not braking, the motor is driven to wind the transmission belt around the drive pulley at a constant speed, and as the transmission belt is unwound from the pulley of the attachment, the disc rotor rotates. I am made to do so. Due to the torque fluctuation of the disc rotor at this time, the guide with the floating pulley moves along the rail against or by the bias of the tension spring, and this causes the needle to be guided. A pair of torque indicating pieces of the scale are slid according to the positions of both ends of the movement range of the scale. Therefore, the maximum and minimum values of the drag torque can be read from the graduations of the scale at the moving positions of the pair of torque indicator pieces.

Embodiments This invention will be described below based on drawings showing embodiments. FIG. 1 is a front view of the embodiment. 1 is an attachment, which includes a pulley portion 1a and a leg portion 1b.
It can be attached to a disc rotor R of an automobile or the like using a hub bolt B. One end of a transmission belt 15 made of stainless steel wire or the like is wound around the pulley portion 1a.

A measurement board 2 is disposed in front of the attachment 1 in the unwinding direction of the transmission belt 15 from the pulley portion 1a. This measurement board 2 is arranged almost vertically on a stand 3 consisting of two columnar members,
It is attached with screws 4 so that its height can be adjusted. A rail 5 is horizontally attached to approximately the center of the measurement board 2, and a guide 6 is movably provided on the rail 5. A floating pulley 7 is rotatably attached to the guide 6. A tension spring 8 is coupled to the end of the guide 6 opposite to the attachment 1, and the opposite end of the tension spring 8 is fixed to the measurement board 2. A scale 9 is mounted above the rail 5 of the measurement board 2 and parallel to the rail 5. The scale 9 has a pair of torque indicating pieces 10 that are horizontally slidable. Further, the guide 6 includes
A needle 11 is attached to indicate the graduations of the scale 9. The tip of this needle 11 is located between the pair of torque indicator pieces 10. A small motor 12 is attached to the lower part of the measurement board 2 on the attachment 1 side. The small motor 12 is connected to a battery 14 via a forward/reverse and off switch 13 on the measurement board 2. The small motor 12 has a drive pulley 12a located approximately midway between the pulley portion 1a of the attachment 1 and the floating pulley 7. The unwinding end of the transmission belt 15 from the pulley portion 1a of the attachment 1 is wrapped around the drive pulley 12a after being hung around the floating pulley 7 in a folded manner. In addition, the switch 1
3 is a three-position switching type motor 12 having a forward rotation side ON position, a reverse rotation side ON position, and an OFF position. Note that FIG. 2 shows a power supply circuit for the small motor 12.

When performing a disc brake drag torque measurement test using the drag torque measuring jig constructed as described above, first attach the attachment 1 to the disc rotor R with the hub bolt B. Note that at this time, the measurement board 2 is placed on the side of the disk rotor R.

In addition, in the initial state of the test before the start of the measurement test, the transmission belt 15 is connected to the pulley portion 1a of the attachment 1.
is rolled up. Also, by moving the guide 6, the tip of the needle 11 can be adjusted to the scale 9.
A pair of torque indicating pieces 10 are arranged on both sides of the tip of the needle 11. Note that even in this state, the tension of the tension spring 8 is acting on the guide 6. Furthermore, since the measurement test cannot be performed unless the disc brake's operating force is released, the disc brake must already be released when the measurement test is performed.

Then, when the disc brake is in a non-braking state, when the switch 13 is turned on to the normal rotation side and the motor 12 is driven to rotate in the normal direction, the transmission belt 15 is wound around the drive pulley 12a at a constant speed. As a result, as the transmission belt 15 is unwound from the pulley portion 1a of the attachment 1, the disk
Rotor R is rotated. At this time, torque fluctuations due to the drag torque of the disc rotor R act on the tension spring 8 via the guide 6 having the floating pulley 7. That is, when the drag torque is large, the resistance to the unwinding of the transmission belt 15 from the attachment 1 is large, so that the floating pulley 7 has less slack in the transmission belt 15, so that the floating pulley 7 and the guide 6 are The needle 11 moves to the left in FIG. 1 against the bias of the needle 8, thereby causing the torque indicating piece 10 on the left side in the figure to slide in the same direction. Additionally, when the drag torque decreases during measurement, the resistance to the unwinding of the transmission belt 15 from the attachment 1 is small, so the guide 6 moves to the right in FIG. 1 together with the floating pulley 7 due to the bias of the tension spring 8. is,
The floating pulley 7 provides more slack in the transmission belt 15, which causes the needle 11 to slide the torque indicator piece 10 on the right side in the figure in the same direction. Note that each torque indicator piece 10 stops at the maximum movement position of the needle 11, and the subsequent needles 1
It is not affected by the movement of 1.

In this way, the needle 11 slides the pair of torque indicator pieces 10 on the scale 9 in accordance with the positions at both ends of the movement range of the guide 6 due to fluctuations in the drag torque of the disc rotor R, thereby providing each torque instruction. The maximum and minimum values of the drag torque can be read from the graduations of the scale 9 at the movement position of the piece 10.

Note that the winding speed of the transmission belt 15 by the motor 12 is set to a constant speed in order to improve the detection accuracy, since if the winding speed of the transmission belt 15 is too high, a large amount of torque will be detected by the mass of the disk rotor R at the initial stage of rotation. There is.

Further, the switch 13 is turned off when the rewinding of the transmission belt 15 from the pulley portion 1a of the attachment 1 is completed. Also, after the measurement is completed, switch 1
3 is turned on to the reverse direction and the motor 12 is driven in the reverse direction, the transmission belt 15 is rewound from the drive pulley 12a. This rewinding transmission belt 15
The pulley part 1 of the attachment 1 is rotated by the operator's hand to rotate the disc rotor.
It is rolled up to a. In this way, the measurement test is performed on the same disk rotor R about three times, for example.

Note that by rotating the motor 12 in the reverse direction, it is possible to easily unwind the transmission belt 15 from the drive pulley 12a.

Effects of the invention According to this invention, the drag torque of the disc brake is automatically measured, and the measurement result is indicated by a pair of torque indicator pieces on the scale.・
The problem of measurement using a measuring device such as a gauge is improved, and the drag torque of a disc brake can be easily and accurately measured.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, with FIG. 1 being a front view and FIG. 2 being a power supply circuit diagram. 1... Attachment, 2... Measurement board, 7...
...Floating pulley, 8...Tension spring,
9...Scale, 10...Maximum or minimum torque indicator piece, 11...Needle, 12...Small motor, 15...Transmission belt, R...Disk rotor.

Claims (1)

[Scope of Claim for Utility Model Registration] An attachment that has a pulley portion and is attached to a disc rotor of an automobile or the like using a hub bolt, a transmission belt that is wound around the pulley portion, and that is separate from the attachment and a measurement board disposed substantially vertically in front of the transmission belt in the unwinding direction from the pulley portion; a rail installed substantially horizontally on the measurement board along the unwinding direction of the transmission belt; a guide provided movably along the rail; a floating pulley rotatably supported by the guide and having an end portion on the unwinding side of the transmission belt hung in a folded manner; a motor having a drive pulley installed adjacent to the attachment side end of the transmission belt and winding up the unwinding side end of the transmission belt via the floating pulley; a tension spring that applies tension to the transmission belt; a scale that is installed on the measurement board parallel to the rail and has a pair of horizontally slidable torque indicator pieces; and a scale that is fixed to the guide and that a needle whose tip end is located between the two torque indicator pieces;
A disc brake drag torque measurement jig characterized by: