JP4126006B2 - Braking force measurement method - Google Patents

Braking force measurement method Download PDF

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JP4126006B2
JP4126006B2 JP2003354922A JP2003354922A JP4126006B2 JP 4126006 B2 JP4126006 B2 JP 4126006B2 JP 2003354922 A JP2003354922 A JP 2003354922A JP 2003354922 A JP2003354922 A JP 2003354922A JP 4126006 B2 JP4126006 B2 JP 4126006B2
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wheel
roller
braking force
measurement
vehicle
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JP2005121419A (en
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賢一郎 倉井
純男 野口
和之 深町
勝由 堤田
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Honda Motor Co Ltd
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本発明は、車両の各車輪のブレーキの制動力を測定する制動力測定方法に関する。   The present invention relates to a braking force measuring method for measuring a braking force of a brake of each wheel of a vehicle.

従来、車両の左右の前輪と左右の後輪とから成る計４個の車輪に対応する計４個の測定ローラを備え、各測定ローラを同期回転する前後一対の分割ローラで構成して、各車輪が各測定ローラの両分割ローラに跨って支持されるようにした台上試験機を用い、測定ローラをローラ用の駆動源により回転させて、車両のブレーキ操作時に車輪を介して測定ローラに作用する負荷に基づいて車輪のブレーキの制動力を測定する方法が知られている。   Conventionally, a total of four measurement rollers corresponding to a total of four wheels consisting of left and right front wheels and left and right rear wheels of a vehicle are provided, and each measurement roller is constituted by a pair of front and rear divided rollers, Using a bench test machine in which the wheel is supported across both divided rollers of each measuring roller, the measuring roller is rotated by a driving source for the roller, and when the vehicle is braked, the measuring roller is passed through the wheel. A method for measuring the braking force of a wheel brake based on an applied load is known.

そして、従来は、左右の前輪用の測定ローラのみを回転させて前輪のブレーキ制動力を測定する前輪測定工程と、左右の後輪用の測定ローラのみを回転させて後輪のブレーキ制動力を測定する後輪測定工程との２工程に分けて測定を行っている。ここで、ブレーキ操作時には、回転する測定ローラから車輪に測定ローラの回転方向に向けてブレーキの制動力分の推力が作用する。車輪は、測定ローラの一対の分割ローラに跨るようにして安定に支持されているが、上記推力が大きくなると、推力の作用方向に位置する片側の分割ローラに車輪が乗り上がるようにして車両が動き、車輪が測定ローラから脱輪し、制動力を測定できなくなることがある。   Conventionally, the front wheel measurement process in which only the measurement rollers for the left and right front wheels are rotated to measure the brake braking force of the front wheels, and the brake braking force of the rear wheels is increased by rotating only the measurement rollers for the left and right rear wheels. The measurement is performed in two steps, the rear wheel measurement step to be measured. Here, at the time of brake operation, a thrust corresponding to the braking force of the brake acts on the wheel from the rotating measurement roller toward the rotation direction of the measurement roller. The wheels are stably supported so as to straddle the pair of split rollers of the measuring roller.However, when the thrust increases, the vehicle rides on the split rollers on one side located in the direction of the thrust. The wheel may move and the wheel may come off from the measuring roller, making it impossible to measure the braking force.

そこで、従来、台上試験機に各車輪に当接するストッパローラを設け、ブレーキ操作時に測定ローラから作用する推力によって車両が動くことを防止できるようにしたものが知られている(例えば、特許文献１参照。)。この場合、台上試験機に車両を出し入れする際、ストッパローラが邪魔にならないように、ストッパローラを出没自在に設ける必要がある。そのため、台上試験機の構造が複雑になって、コストが高くなる。
特開平５−２０９８１４号公報(段落０００９，００１０、図１) In view of this, conventionally, there has been known a table testing machine provided with a stopper roller that comes into contact with each wheel so that the vehicle can be prevented from moving by a thrust applied from the measuring roller during brake operation (e.g., patent document). 1). In this case, when the vehicle is taken in and out of the bench tester, it is necessary to provide the stopper roller so that it can be moved in and out so that the stopper roller does not get in the way. This complicates the structure of the bench testing machine and increases the cost.
Japanese Patent Laid-Open No. 5-209814 (paragraphs 0009, 0010, FIG. 1)

本発明は、以上の点に鑑み、ストッパローラを設けなくても、測定ローラからの脱輪を防止して、各車輪のブレーキの制動力を確実に測定できるようにした制動力測定方法を提供することをその課題としている。   In view of the above points, the present invention provides a braking force measurement method that can prevent the wheel from coming off from the measuring roller and reliably measure the braking force of each wheel without providing a stopper roller. The task is to do.

本発明は、車両の左右の前輪と左右の後輪とから成る計４個の車輪に対応する計４個の測定ローラを備え、各測定ローラを同期回転する前後一対の分割ローラで構成して、各車輪が各測定ローラの両分割ローラに跨って支持されるようにした台上試験機を用い、測定ローラをローラ用の駆動源により回転させて、車両のブレーキ操作時に車輪を介して測定ローラに作用する負荷に基づいて車輪のブレーキの制動力を測定する制動力測定方法の改良に関し、上記課題を解決するために、各測定ローラに、該各測定ローラを停止状態に拘束可能な拘束手段を連結し、測定工程を車両の右前輪および左後輪を測定対象車輪としてそのブレーキの制動力を測定する第１工程と、車両の左前輪および右後輪を測定対象車輪としてそのブレーキの制動力を測定する第２工程とに分け、第１と第２の各工程において、非測定対象車輪となる前後２個の車輪用の測定ローラを拘束手段により拘束し、車両のブレーキ操作時に車両の各車輪が各測定ローラの一対の分割ローラに跨って支持される状態から片側の分割ローラに乗り上がる状態に変化することを非測定車輪となる前後２個の車輪のブレーキの制動力により阻止している。   The present invention comprises a total of four measuring rollers corresponding to a total of four wheels consisting of left and right front wheels and left and right rear wheels of a vehicle, and is constituted by a pair of front and rear divided rollers that rotate each measuring roller synchronously. Using a bench test machine that supports each wheel across both divided rollers of each measuring roller, the measuring roller is rotated by a driving source for the roller, and measurement is performed via the wheel during brake operation of the vehicle. To improve the braking force measurement method for measuring the braking force of a wheel brake based on a load acting on a roller, in order to solve the above problem, each measurement roller is restrained to be able to restrain each measurement roller in a stopped state. A first step of measuring the braking force of the brake with the right front wheel and the left rear wheel of the vehicle as the measurement target wheels, and the measurement step of the brake with the left front wheel and the right rear wheel of the vehicle as the measurement target wheels. Braking force In the first and second steps, the measurement rollers for the two front and rear wheels that are non-measurement target wheels are restrained by restraining means in each of the first and second steps. Is prevented by the braking force of the brakes of the two front and rear wheels that are non-measuring wheels from changing from a state of being supported across a pair of divided rollers of each measuring roller to a state of riding on one of the divided rollers. .

本発明の如く、非測定対象車輪用の測定ローラを拘束することにより、ブレーキ操作時には、非測定対象車輪のブレーキ制動力が車両の動きを阻止する抵抗力として働く。また、各車輪を各測定ローラの片側の分割ローラに乗り上らせるのに必要な力(乗り上げ負荷)も車両の動きを阻止する抵抗力として働く。従って、測定対象車輪に作用する測定ローラからの推力の合計が非測定対象車輪のブレーキ制動力と乗り上げ負荷との合計を上回らない限り、車両は動かず、各車輪が各測定ローラの片側の分割ローラに乗り上がること、即ち、各車輪が各測定ローラから脱輪することが防止される。   By restraining the measuring roller for the non-measuring target wheel as in the present invention, the brake braking force of the non-measuring target wheel acts as a resistance force that prevents the vehicle from moving during braking. Further, the force (riding load) required to cause each wheel to ride on the divided roller on one side of each measuring roller also acts as a resistance force that prevents the vehicle from moving. Therefore, as long as the total thrust from the measuring roller acting on the measurement target wheel does not exceed the sum of the brake braking force and the riding load of the non-measurement target wheel, the vehicle does not move and each wheel is divided on one side of each measurement roller. It is possible to prevent the wheels from getting on the roller, that is, the wheels from being detached from the measuring rollers.

ここで、前輪のブレーキ制動力は後輪のブレーキ制動力よりかなり大きいが、本発明では、測定対象車輪である一方の前輪に作用するそのブレーキ制動力分の推力と非測定対象車輪である他方の前輪のブレーキ制動力分の抵抗力とがほぼ拮抗し、同様に測定対象車輪である一方の後輪に作用するそのブレーキ制動力分の推力と非測定対象車輪である他方の後輪のブレーキ制動力分の抵抗力とがほぼ拮抗する。そのため、測定対象車輪に作用する測定ローラからの推力の合計が非測定対象車輪のブレーキ制動力と乗り上げ負荷との合計を上回ることはなく、各車輪が各測定ローラの片側の分割ローラに乗り上がって脱輪することが確実に防止される。   Here, although the brake braking force of the front wheel is considerably larger than the brake braking force of the rear wheel, in the present invention, the thrust for the brake braking force acting on one front wheel that is a measurement target wheel and the other wheel that is a non-measurement target wheel. The resistance force of the brake braking force of the front wheel of the other wheel is almost antagonistic, and similarly the thrust of the brake braking force acting on one rear wheel that is a measurement target wheel and the brake of the other rear wheel that is a non-measurement wheel The resistance against the braking force is almost antagonized. Therefore, the total thrust from the measuring roller acting on the measurement target wheel does not exceed the sum of the brake braking force and the riding load of the non-measurement target wheel, and each wheel climbs on the split roller on one side of each measurement roller. This ensures that the wheel is removed.

尚、測定工程を車両の右前輪および右後輪を測定対象車輪としてそのブレーキの制動力を測定する工程と、車両の左前輪および左後輪を測定対象車輪としてそのブレーキの制動力を測定する工程とに分けることも考えられるが、これでは、ブレーキ操作時に車両の左右片側に測定対象車輪である前後の車輪のブレーキ制動力分の推力、反対側に非測定対象車輪である前後の車輪のブレーキ制動力分の抵抗力が作用して、車両に旋回モーメントが加わり、台上試験機上で車両がスピンする可能性がある。これに対し、本発明では、測定対象車輪となる前後の車輪が車両の左右反対側に位置するため、車両に旋回モーメントが加わることはない。従って、測定ローラからの脱輪および車両のスピンを防止して、各車輪のブレーキの制動力を確実に測定できる   The measurement process includes measuring the braking force of the brake using the right front wheel and the right rear wheel of the vehicle as the measurement target wheels, and measuring the braking force of the brake using the left front wheel and the left rear wheel of the vehicle as the measurement target wheels. It is possible to divide the process into processes, but in this case, at the time of braking, the thrust of the braking braking force of the front and rear wheels that are the measurement target wheels on one side of the vehicle, and the front and rear wheels that are the non-measurement wheels on the opposite side There is a possibility that a resistance force corresponding to the braking force acts on the vehicle and a turning moment is applied to the vehicle, causing the vehicle to spin on the bench test machine. On the other hand, in the present invention, the front and rear wheels that are the measurement target wheels are positioned on opposite sides of the vehicle, so that no turning moment is applied to the vehicle. Accordingly, it is possible to reliably measure the braking force of the brakes of each wheel by preventing the wheel from being removed from the measuring roller and the vehicle spinning.

図１は、２輪駆動の自動車から成る車両Ａの各車輪のブレーキの制動力を測定する台上試験機を示している。台上試験機は、図示省略した機台に軸支される、車両Ａの計４個の車輪、即ち、左前輪Ｗｆｌ、右前輪Ｗｆｒ、左後輪Ｗｒｌおよび右後輪Ｗｒｒに対応する計４個の測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒを備えている。   FIG. 1 shows a bench test machine for measuring a braking force of each wheel of a vehicle A composed of a two-wheel drive automobile. The bench test machine is pivotally supported by a machine base (not shown) and corresponds to a total of four wheels of vehicle A, that is, a total of four wheels corresponding to the left front wheel Wfl, the right front wheel Wfr, the left rear wheel Wrl, and the right rear wheel Wrr. The measuring rollers 1fl, 1fr, 1rl, 1rr are provided.

各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒは、夫々、前後に並設した一対の分割ローラ２，３で構成されており、図２に示す如く、車輪が両分割ローラ２，３に跨って安定に支持されるようにしている。両分割ローラ２，３は、チェーン等の連結手段４により同期回転するように連結されている。そして、両分割ローラ２，３の一方、例えば、後側の分割ローラ３に電動モータ等から成る駆動源５を連結し、駆動源５により両分割ローラ２，３を回転駆動できるようにしている。また、分割ローラ３と駆動源５との間の動力伝達経路には、トルク計等から成る負荷検出器６と減速機７とが介設され、更に、分割ローラ３(測定ローラ)を停止状態に拘束する拘束手段としてのローラ用ブレーキ８が設けられている。   Each measuring roller 1fl, 1fr, 1rl, 1rr is composed of a pair of split rollers 2 and 3 arranged in parallel at the front and rear, respectively, and the wheel is stable across both split rollers 2 and 3, as shown in FIG. To be supported. Both split rollers 2 and 3 are connected so as to rotate synchronously by connecting means 4 such as a chain. A drive source 5 composed of an electric motor or the like is connected to one of the divided rollers 2 and 3, for example, the rear divided roller 3 so that the divided rollers 2 and 3 can be rotationally driven by the drive source 5. . In addition, a load detector 6 including a torque meter and a speed reducer 7 are interposed in the power transmission path between the split roller 3 and the drive source 5, and the split roller 3 (measuring roller) is stopped. A roller brake 8 is provided as a restraining means for restraining.

車両Ａの各車輪のブレーキ制動力の測定は以下の手順で行われる。先ず、作業者が車両に搭乗して台上試験機上に車両を乗り入れ、左前輪Ｗｆｌ、右前輪Ｗｆｒ、左後輪Ｗｒｌおよび右後輪Ｗｒｒを対応する測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒに乗せ、各車輪が各測定ローラの両分割ローラ２，３に跨って支持されるようにする。   The brake braking force of each wheel of the vehicle A is measured according to the following procedure. First, an operator gets into the vehicle and enters the vehicle on the bench tester. The left front wheel Wfl, the right front wheel Wfr, the left rear wheel Wrl, and the right rear wheel Wrr are placed on the corresponding measurement rollers 1fl, 1fr, 1rl, 1rr. Each wheel is supported so as to straddle both the split rollers 2 and 3 of each measuring roller.

次に、車両Ａの一方の対角線上に位置する右前輪Ｗｆｒと左後輪Ｗｒｌとを測定対象車輪としてそのブレーキの制動力を測定する第１工程と、車両Ａの他方の対角線上に位置する左前輪Ｗｆｌと右後輪Ｗｒｒとを測定対象車輪としてそのブレーキの制動力を測定する第２工程とを、第１工程−第２工程の順、または、第２工程―第１工程の順に実行する。   Next, the first step of measuring the braking force of the brake using the right front wheel Wfr and the left rear wheel Wrl positioned on one diagonal line of the vehicle A as the measurement target wheels, and the other diagonal line of the vehicle A are positioned. The second step of measuring the braking force of the brake using the left front wheel Wfl and the right rear wheel Wrr as the measurement target wheels is executed in the order of the first step-the second step or the second step-the first step. To do.

第１工程では、非測定対象車輪である左前輪Ｗｆｌ用と右後輪Ｗｒｒ用の測定ローラ１ｆｌ，１ｒｒの夫々のローラ用ブレーキ８を作動させて、測定ローラ１ｆｌ，１ｒｒを停止状態に拘束し、この状態で右前輪Ｗｆｒ用と左後輪Ｗｒｌ用の測定ローラ１ｆｒ，１ｒｌを夫々の駆動源５により右前輪Ｗｆｒと左後輪Ｗｒｌとが車両前進方向に回転するように回転させる。そして、作業者にブレーキ操作、即ち、ブレーキペダルの踏み込み操作を行わせ、このときに右前輪Ｗｆｒ用と左後輪Ｗｒｌ用の測定ローラ１ｆｒ，１ｒｌに作用する負荷を夫々の負荷検出器６で検出して記録する。   In the first step, the roller brakes 8 of the measurement rollers 1fl and 1rr for the left front wheel Wfl and the right rear wheel Wrr, which are non-measurement target wheels, are actuated to restrain the measurement rollers 1fl and 1rr to be stopped. In this state, the measurement rollers 1fr and 1rl for the right front wheel Wfr and the left rear wheel Wrl are rotated by the respective drive sources 5 so that the right front wheel Wfr and the left rear wheel Wrl rotate in the vehicle forward direction. Then, the operator performs a brake operation, that is, a brake pedal depression operation. At this time, loads acting on the measurement rollers 1fr and 1rl for the right front wheel Wfr and the left rear wheel Wrl are respectively detected by the load detectors 6. Detect and record.

同様に、第２工程では、非測定対象車輪である右前輪Ｗｆｒ用と左後輪Ｗｒｌ用の測定ローラ１ｆｒ，１ｒｌの夫々のローラ用ブレーキ８を作動させて、測定ローラ１ｆｒ，１ｒｌを停止状態に拘束し、この状態で左前輪Ｗｆｌ用と右後輪Ｗｒｒ用の測定ローラ１ｆｌ，１ｒｒを夫々の駆動源５により左前輪Ｗｆｌと右後輪Ｗｒｒとが車両前進方向に回転するように回転させる。そして、作業者にブレーキペダルの踏み込み操作を行わせ、このときに左前輪Ｗｆｌ用と右後輪Ｗｒｒ用の測定ローラ１ｆｌ，１ｒｒに作用する負荷を夫々の負荷検出器６で検出して記録する。   Similarly, in the second step, the measurement rollers 1fr and 1rl are stopped by operating the roller brakes 8 of the measurement rollers 1fr and 1rl for the right front wheel Wfr and the left rear wheel Wrl, which are non-measurement target wheels. In this state, the measurement rollers 1fl and 1rr for the left front wheel Wfl and the right rear wheel Wrr are rotated by the respective drive sources 5 so that the left front wheel Wfl and the right rear wheel Wrr rotate in the vehicle forward direction. . Then, the operator depresses the brake pedal. At this time, the loads acting on the measurement rollers 1fl and 1rr for the left front wheel Wfl and the right rear wheel Wrr are detected and recorded by the respective load detectors 6. .

ところで、第１と第２の各工程において、ブレーキ操作時には、測定対象車輪に回転する測定ローラからその回転方向(後方)に向けて、測定対象車輪のブレーキの制動力分の推力が作用し、この推力で車両Ａが後方に押される。一方、非測定対象車輪用の測定ローラは停止状態に拘束されているため、非測定対象車輪のブレーキの制動力が車両Ａの動きを阻止する抵抗力として働く。また、各車輪Ｗｆｌ，Ｗｆｒ，Ｗｒｌ，Ｗｒｒが各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒの後側の分割ローラ３に乗り上がらないと、車両Ａは後方に動かず、各車輪Ｗｆｌ，Ｗｆｒ，Ｗｒｌ，Ｗｒｒを各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒの後側の分割ローラ３に乗り上らせるのに必要な力(乗り上げ負荷)も車両Ａの動きを阻止する抵抗力として働く。   By the way, in each of the first and second steps, at the time of brake operation, a thrust corresponding to the braking force of the brake of the measurement target wheel acts from the measurement roller rotating to the measurement target wheel toward the rotation direction (rear). The vehicle A is pushed backward by this thrust. On the other hand, since the measurement roller for the non-measurement target wheel is restrained in a stopped state, the braking force of the brake of the non-measurement target wheel acts as a resistance force that blocks the movement of the vehicle A. Further, if each wheel Wfl, Wfr, Wrl, Wrr does not ride on the divided roller 3 on the rear side of each measuring roller 1fl, 1fr, 1rl, 1rr, the vehicle A does not move backward, and each wheel Wfl, Wfr, Wrl. , Wrr also acts as a resistance force that prevents the movement of the vehicle A (loading load) required to ride the divided rollers 3 on the rear side of the measuring rollers 1fl, 1fr, 1rl, 1rr.

ここで、前輪Ｗｆｌ，Ｗｆｒのブレーキの制動力は後輪Ｗｒｌ，Ｗｒｒのブレーキの制動力に比しかなり大きい。そのため、左右の前輪Ｗｆｌ，Ｗｆｒ用の測定ローラ１ｆｌ、ｆｒを回転させて、左右の前輪Ｗｆｌ，Ｗｆｒのブレーキ制動力を同時に測定すると、左右の後輪Ｗｒｌ，Ｗｒｒ用の測定ローラ１ｒｌ，１ｒｒを停止状態に拘束しても、左右の前輪Ｗｆｌ，Ｗｆｒのブレーキ制動力の合計と左右の後輪Ｗｒｌ，Ｗｒｒのブレーキ制動力の合計との差が各車輪の乗り上げ負荷の合計(４輪の合計の乗り上げ負荷)以上になって、車両Ａが後方に動き、各車輪Ｗｆｌ，Ｗｆｒ，Ｗｒｌ，Ｗｒｒが後側の分割ローラ３に乗り上げて各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒから脱輪してしまう。この場合、前輪用の各測定ローラ１ｆｌ、ｆｒに各前輪Ｗｆｌ，Ｗｆｒを介して作用するブレーキ制動力による負荷(負荷検出器６で検出される負荷)の変化は図４にｂ線で示すようになる。即ち、各前輪Ｗｆｌ，Ｗｆｒが後側の分割ローラ３に乗り上げるまでは負荷が増加するが、その後は負荷が減少してしまい、前輪ブレーキの実際の制動力が所定の判定基準値ＦＢ以上になっていたとしても、負荷がそこまでは増加しなくなる。   Here, the braking force of the brakes of the front wheels Wfl and Wfr is considerably larger than the braking force of the brakes of the rear wheels Wrl and Wrr. Therefore, when the measurement braking forces 1fl and fr for the left and right front wheels Wfl and Wfr are rotated and the brake braking force of the left and right front wheels Wfl and Wfr is measured simultaneously, the measurement rollers 1rl and 1rr for the left and right rear wheels Wrl and Wrr are measured. Even when restrained in a stopped state, the difference between the total braking force of the left and right front wheels Wfl and Wfr and the total braking force of the left and right rear wheels Wrl and Wrr is the sum of the load on each wheel (total of the four wheels). When the vehicle A moves rearward, each wheel Wfl, Wfr, Wrl, Wrr rides on the rear divided roller 3 and derails from each measuring roller 1fl, 1fr, 1rl, 1rr. End up. In this case, the change in the load (the load detected by the load detector 6) due to the brake braking force acting on the measurement wheels 1fl and fr for the front wheels via the front wheels Wfl and Wfr is shown by a line b in FIG. become. That is, the load increases until each front wheel Wfl, Wfr rides on the rear split roller 3, but thereafter the load decreases, and the actual braking force of the front wheel brake becomes equal to or greater than a predetermined determination reference value FB. If so, the load will not increase that much.

これに対し、本実施形態では、第１工程において、図３(ａ)に示す如く、測定対象車輪たる右前輪Ｗｆｒのブレーキ制動力分の推力Ｆｆｒと非測定対象車輪たる左前輪Ｗｆｌのブレーキ制動力分の抵抗力Ｆｆｌとがほぼ拮抗すると共に、測定対象車輪たる左後輪Ｗｒｌのブレーキ制動力分の推力Ｆｒｌと非測定対象車輪たる右後輪Ｗｒｒのブレーキ制動力分の抵抗力Ｆｒｒとがほぼ拮抗する。仮に各車輪のブレーキの制動力差により、Ｆｆｒ＋Ｆｒｌ＞Ｆｆｌ＋Ｆｒｒになっても、その差が各車輪の乗り上げ負荷Ｆｕｐの合計(車重の約４０％)以上になることはなく、Ｆｆｒ＋Ｆｒｌ＜Ｆｆｌ＋Ｆｒｒ＋４Ｆｕｐの関係が保たれる。同様に、第２工程においても、図３(ｂ)に示す如く、測定対象車輪たる左前輪Ｗｆｌのブレーキ制動力分の推力Ｆｆｌと非測定対象車輪たる右前輪Ｗｆｒのブレーキ制動力分の抵抗力Ｆｆｒとがほぼ拮抗すると共に、測定対象車輪たる右後輪Ｗｒｒのブレーキ制動力分の推力Ｆｒｒと非測定対象車輪たる左後輪Ｗｒｌのブレーキ制動力分の抵抗力Ｆｒｌとがほぼ拮抗し、Ｆｆｌ＋Ｆｒｒ＜Ｆｆｒ＋Ｆｒｌ＋４Ｆｕｐの関係が保たれる。   In contrast, in the present embodiment, in the first step, as shown in FIG. 3A, the thrust Ffr corresponding to the braking braking force of the right front wheel Wfr that is the measurement target wheel and the brake control of the left front wheel Wfl that is the non-measurement target wheel. The resistance force Ffl corresponding to the power almost antagonizes, and the thrust Frl corresponding to the brake braking force of the left rear wheel Wrl as the measurement target wheel and the resistance force Frr corresponding to the brake braking force of the right rear wheel Wrr as the non-measurement target wheel. It almost antagonizes. Even if Ffr + Frl> Ffl + Frr due to the braking force difference of the brakes of each wheel, the difference does not exceed the sum of the loading loads Fup of each wheel (about 40% of the vehicle weight), and the relationship of Ffr + Frl <Ffl + Frr + 4Fup Is preserved. Similarly, in the second step, as shown in FIG. 3B, the thrust Ffl corresponding to the braking braking force of the left front wheel Wfl as the measurement target wheel and the resistance force corresponding to the braking braking force of the right front wheel Wfr as the non-measurement target wheel. Ffr substantially antagonizes, and the thrust Frr corresponding to the brake braking force of the right rear wheel Wrr as the measurement target wheel and the resistance force Frl corresponding to the brake braking force of the left rear wheel Wrl as the non-measurement target wheel almost antagonize, and Ffl + Frr The relationship <Ffr + Frl + 4Fup is maintained.

従って、本実施形態では、従来例のようにストッパローラを設けなくても、車両Ａは後方に動かず、各車輪Ｗｆｌ，Ｗｆｒ，Ｗｒｌ，Ｗｒｒが後側の分割ローラ３に乗り上げて各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒから脱輪することが防止される。そのため、測定対象車輪用の測定ローラの負荷検出器６で検出される負荷は、図４にａ線で示すように、実際のブレーキ制動力に追従して増加し、この負荷が判定基準値ＦＢ以上になったか否かで、ブレーキ制動力の合否を正確に判定できる。   Therefore, in the present embodiment, even if the stopper roller is not provided as in the conventional example, the vehicle A does not move backward, and each wheel Wfl, Wfr, Wrl, Wrr rides on the rear divided roller 3 and each measurement roller. It is possible to prevent the wheel from deviating from 1fl, 1fr, 1rl, 1rr. Therefore, the load detected by the load detector 6 of the measuring roller for the wheel to be measured increases following the actual braking force as shown by line a in FIG. Whether or not the brake braking force is acceptable can be accurately determined based on whether or not the above has been reached.

ところで、左右同じ側の前輪と後輪とを測定対象車輪としてそのブレーキの制動力を同時に測定することも考えられるが、これでは、測定対象車輪が位置する車両Ａの左右片側に測定対象車輪のブレーキ制動力分の推力が作用し、反対側に非測定対象車輪のブレーキ制動力分の抵抗力が作用するため、車両Ａに旋回モーメントが加わり、車両Ａがスピンする可能性がある。一方、本実施形態では、測定対象車輪となる前後の車輪が車両Ａの左右反対側に位置するため、車両Ａに旋回モーメントが加わることはなく、車両Ａのスピンも防止される。   By the way, it is conceivable to simultaneously measure the braking force of the brake using the front wheel and the rear wheel on the same left and right sides as the measurement target wheels. A thrust force corresponding to the brake braking force acts, and a resistance force corresponding to the brake braking force of the non-measurement target wheel acts on the opposite side, so that a turning moment is applied to the vehicle A and the vehicle A may spin. On the other hand, in the present embodiment, since the front and rear wheels that are the measurement target wheels are located on the left and right sides of the vehicle A, no turning moment is applied to the vehicle A, and the spin of the vehicle A is also prevented.

尚、上記実施形態では、各測定ローラ１ｆｌ，１ｆｒ，１ｒｌ，１ｒｒをローラ用のブレーキ８で停止状態に拘束可能としたが、減速機７として入力側のウォームと、ウォームに噛合する出力側のウォームホイールとを備えるウォーム式のものを用いれば、駆動源５でウォームを回転させない限り測定ローラは回転せず、駆動源５を停止すると、測定ローラが停止状態に拘束される。従って、このようなウォーム式の減速機で拘束手段を兼用することも可能である。   In the above embodiment, the measuring rollers 1fl, 1fr, 1rl, and 1rr can be restrained to be stopped by the roller brake 8. However, as the speed reducer 7, the input side worm and the output side meshing with the worm are arranged. If a worm type equipped with a worm wheel is used, the measurement roller does not rotate unless the worm is rotated by the drive source 5, and when the drive source 5 is stopped, the measurement roller is constrained to a stopped state. Accordingly, it is also possible to use the worm type speed reducer also as a restraining means.

本発明方法の実施に使用する台上試験機の一例を示す平面図。The top view which shows an example of the bench test machine used for implementation of the method of this invention. 台上試験機に車両を乗り入れた状態を示す側面図Side view showing a vehicle placed on a bench test machine (ａ)第１工程で各車輪に作用する力を示す説明図、(ｂ)第２工程で各車輪に作用する力を示す説明図。(a) Explanatory drawing which shows the force which acts on each wheel at a 1st process, (b) Explanatory drawing which shows the force which acts on each wheel at a 2nd process. 測定ローラに作用する負荷の変化を示すグラフ。The graph which shows the change of the load which acts on a measurement roller.

符号の説明Explanation of symbols

Ａ…車両、Ｗｆｌ…左前輪、Ｗｆｒ…右前輪、Ｗｒｌ…左後輪、Ｗｒｒ…右後輪、１ｆｌ…左後輪用の測定ローラ、１ｆｒ…右前輪用の測定ローラ、１ｒｌ…左後輪用の測定ローラ、１ｒｒ…右前輪用の測定ローラ、２，３…分割ローラ、５…ローラ用の駆動源、６…負荷検出器、８…ローラ用のブレーキ(拘束手段)。   A ... vehicle, Wfl ... left front wheel, Wfr ... right front wheel, Wrl ... left rear wheel, Wrr ... right rear wheel, 1fl ... measurement roller for left rear wheel, 1fr ... measurement roller for right front wheel, 1rl ... left rear wheel Measuring roller for 1r, measuring roller for right front wheel, 2, 3 ... split roller, 5 ... driving source for roller, 6 ... load detector, 8 ... brake for roller (restraining means).

Claims (1)

車両の左右の前輪と左右の後輪とから成る計４個の車輪に対応する計４個の測定ローラを備え、各測定ローラを同期回転する前後一対の分割ローラで構成して、各車輪が各測定ローラの両分割ローラに跨って支持されるようにした台上試験機を用い、測定ローラをローラ用の駆動源により回転させて、車両のブレーキ操作時に車輪を介して測定ローラに作用する負荷に基づいて車輪のブレーキの制動力を測定する制動力測定方法において、
各測定ローラ毎に、該各測定ローラを停止状態に拘束可能な拘束手段を設け、
測定工程を車両の右前輪および左後輪を測定対象車輪としてそのブレーキの制動力を測定する第１工程と、車両の左前輪および右後輪を測定対象車輪としてそのブレーキの制動力を測定する第２工程とに分け、
第１と第２の各工程において、非測定対象車輪となる前後２個の車輪用の測定ローラを拘束手段により拘束し、車両のブレーキ操作時に車両の各車輪が各測定ローラの一対の分割ローラに跨って支持される状態から片側の分割ローラに乗り上がる状態に変化することを非測定対象車輪となる前後２個の車輪のブレーキの制動力により阻止することを特徴とする制動力測定方法。 A total of four measurement rollers corresponding to a total of four wheels consisting of left and right front wheels and left and right rear wheels of the vehicle are provided, and each measurement roller is constituted by a pair of front and rear divided rollers, Using a bench testing machine that is supported across both divided rollers of each measuring roller, the measuring roller is rotated by a driving source for the roller, and acts on the measuring roller via the wheel when the vehicle is braked. In a braking force measurement method for measuring the braking force of a wheel brake based on a load,
For each measuring roller, a restraining means capable of restraining each measuring roller in a stopped state is provided.
The first step of measuring the braking force of the brake using the right front wheel and the left rear wheel of the vehicle as the measurement target wheels in the measurement process, and the braking force of the brake using the left front wheel and the right rear wheel of the vehicle as the measurement target wheels Divided into the second step,
In each of the first and second steps, the measurement rollers for the two front and rear wheels, which are non-measurement target wheels, are restrained by restraining means, and each wheel of the vehicle is a pair of split rollers of each measurement roller when the vehicle is braked. A braking force measuring method characterized in that a change from a state of being supported across the vehicle to a state of riding on a split roller on one side is prevented by the braking force of the brakes of the two front and rear wheels serving as non-measurement target wheels.
JP2003354922A 2003-10-15 2003-10-15 Braking force measurement method Expired - Fee Related JP4126006B2 (en)

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JP4643534B2 (en) * 2006-09-28 2011-03-02 本田技研工業株式会社 Braking force measurement method
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JP2012242152A (en) * 2011-05-17 2012-12-10 Honda Motor Co Ltd Method for measuring braking force
US10053078B2 (en) * 2015-07-30 2018-08-21 Honda Motor Co., Ltd. Methods, systems, and apparatus to test a vehicle brake system
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