JP5331035B2 - LOAD DETECTING DEVICE AND BRAKE PRESSING FORCE DETECTING DEVICE HAVING THE LOAD DETECTING DEVICE - Google Patents

Description

The present invention relates to a load detection device that detects a load that is input from a brake pedal to an actuator via an input member, and a brake pedaling force detection device that includes the load detection device.

JP-A-11-255084 JP 2007-131230 A

  Conventionally, as a structure for detecting a load from a brake pedal, for example, as shown in Patent Documents 1 and 2, a structure in which a strain gauge for detecting a load from a brake pedal is disposed between an arm of a brake pedal and a push rod. It is disclosed. That is, in the inventions described in Patent Documents 1 and 2, strain gauges are arranged on both side surfaces of the clevis provided at the connection portion between the brake pedal and the input member, and the strain generated in the clevis is caused by the strain gauge. By detecting, the load from a brake pedal is detected.

  However, the conventional load detection devices as shown in Patent Documents 1 and 2 are provided with a strain gauge between the brake pedal arm and the push rod as described above, and are provided outside an actuator such as a booster. The strain gauge is disposed so as to be exposed. Therefore, there is a possibility that a strain gauge exposed to the outside may interfere with peripheral components. Also, when a strain gauge is attached between the brake pedal arm and the push rod as described above, an uneven load in the direction of depression of the brake pedal will be applied to the location where the strain gauge is attached and connected to the brake pedal. It has been difficult to accurately detect the load input to the actuator from the input member.

  Accordingly, the present invention is intended to solve the above-described problems, and does not cause a problem of interference with peripheral parts without exposing a strain gauge to the outside of the actuator, and is connected to a brake pedal. It is intended to make it possible to detect the load from the input member reliably and with high accuracy.

  In order to solve the above-described problems, the present invention relates to a load detection device that detects a load input from a brake pedal to an actuator via an input member. The actuator in the present invention is a device related to brake control, such as a simulator in a so-called brake-by-wire structure provided independently (separated) from a booster, a hydraulic cylinder, and a wheel brake.

A bottomed outer cylindrical member is disposed in the actuator, and a bottomed inner cylindrical member is disposed on the inner side of the outer cylindrical member, and an outer periphery of the inner cylindrical member and an inner periphery of the outer cylindrical member are arranged. The opening of the inner cylindrical member and the opening of the outer cylindrical member are connected and fixed while being inserted through a strain interval therebetween. Then, the tip end portion of the input member is inserted and arranged in the inner cylindrical member so as to be in contact with each other, and a load from the tip end portion of the input member is received by the bottom portion of the inner cylindrical member. As a result, the bottom of the inner cylindrical member is pressed. Then, by pressing the tip of the input member, the side wall of the inner cylindrical member expands in the input direction of the load from the input member, and the outer cylindrical member connected to the inner cylindrical member via the opening portion. The side wall is compressed in the input direction of the load from the input member.

  A pair or a plurality of pairs of strain gauges are arranged in the input direction of the load from the input member on the inner surface or the outer surface of the inner cylindrical member and the outer cylindrical member. As described above, since the strain gauge is arranged in the input direction of the load from the input member, it is possible to accurately detect the distortion generated in the input direction of the load of the input member in the inner cylindrical member and the outer cylindrical member. Therefore, the load input to the actuator can be accurately measured. The strain interval in the present invention means an interval that can accept the strain deformation of the outer cylindrical member and the inner cylindrical member generated when the load from the input member is received. Therefore, by forming this strain interval, when receiving a load from the input member, the outer cylindrical member and the inner cylindrical member are deformed and deformed without contact between the outer cylindrical member and the inner cylindrical member. The load can be accurately measured from the strain.

Further, as described above, according to the present invention, since the outer cylindrical member and the inner cylindrical member each having the strain gauge fixedly arranged are inserted and arranged in the actuator, the strain gauge is not exposed to the outside of the actuator and interferes with peripheral parts. It is possible to avoid the problem of end. Further, as described above, the distal end portion of the input member is inserted and arranged inside the inner cylindrical member, and the strain of the inner cylindrical member and the outer cylindrical member generated when receiving a load from the distal end portion of the input member is measured by a strain gauge. Since measurement is possible, the load from the input member such as a push rod can be detected accurately and with high accuracy without receiving an offset load as in the prior art.

The strain gauges are provided at equal intervals in the circumferential direction of the side wall of the outer cylindrical member and the inner cylindrical member, and the strain gauges of the outer cylindrical member and the strain gauges of the inner cylindrical member are opposed to each other. It may be arranged. By arranging the strain gauge as described above, the strain generated in the outer cylindrical member and the inner cylindrical member can be detected uniformly and accurately without deviation in the mounting position of the strain gauge in the outer cylindrical member and the inner cylindrical member. It becomes possible.

  The strain gauge may be provided on the inner surface of the outer cylindrical member and the outer surface of the inner cylindrical member. By disposing the strain gauge in this way, the strain gauge is disposed between the outer cylindrical member and the inner cylindrical member without being exposed to the outside of the cylindrical member. Accordingly, since all the strain gauges can be protected by the outer cylindrical member and the inner cylindrical member, it is possible to prevent the strain gauges from being damaged due to contact with other parts in the actuator. The distortion of the cylindrical member can be accurately detected over a long period of time.

  The strain gauge may be provided on the outer surface of the outer cylindrical member and the outer surface of the inner cylindrical member. By configuring as described above, it is possible to facilitate the operation of placing strain gauges on the outer cylindrical member and the inner cylindrical member.

  A brake pedal force detection device for detecting a brake pedal force, comprising: the load detection device; the brake pedal; and the input member, and applying a load detected by the load detection device to the brake pedal. The brake pedaling force is acquired by regarding the pedaling force as being determined. Therefore, it is possible to accurately detect the load input from the brake pedal to the actuator via the input member, and to acquire the detection result as the brake pedaling force.

In the present invention, as described above, since the outer cylindrical member and the inner cylindrical member each having the strain gauge fixedly arranged are inserted and arranged in the actuator, the strain gauge is not exposed to the outside of the actuator, and the strain gauge is It is possible to prevent the problem of interference with peripheral parts located outside the device. Further, as described above, the distal end portion of the input member is inserted and arranged inside the inner cylindrical member, and the strain of the inner cylindrical member and the outer cylindrical member caused by the load from the distal end portion of the input member can be detected by the strain gauge. Therefore, the load from the input member can be accurately received at the inner cylindrical member and the outer cylindrical member without receiving an uneven load as in the prior art, and the load input from the brake pedal to the actuator via the input member can be received. It can be measured with high accuracy.

A pair or a plurality of pairs of strain gauges are arranged in the input direction of the load from the input member on the inner surface or the outer surface of the inner cylindrical member and the outer cylindrical member. As described above, since the strain gauge is arranged in the input direction of the load from the input member, it is possible to accurately detect the distortion generated in the input direction of the load of the input member in the inner cylindrical member and the outer cylindrical member. Therefore, the load input to the actuator can be accurately measured.

  A brake pedal force that includes the load detection device, the brake pedal, and the input member, and obtains a brake pedal force by regarding the load detected by the load detection device as a pedal force applied to the brake pedal. It is possible to obtain a brake pedal force detection device that detects Therefore, it is possible to accurately detect the load input from the brake pedal to the actuator via the input member, and to acquire the detection result as the brake pedaling force.

The conceptual diagram which shows Example 1 of this invention. FIG. 3 is a perspective view showing an outer cylindrical member of the first embodiment. FIG. 3 is a perspective view showing an inner cylindrical member of Example 1. The perspective view which shows the state which assembled | attached the outer side cylindrical member and inner side cylindrical member of Example 1. FIG. AA line sectional view of Drawing 4. FIG. 3 is a circuit diagram illustrating a bridge circuit according to the first embodiment.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 6. Reference numeral (1) denotes an outer cylindrical member, which is inserted and arranged in an actuator (3) together with the inner cylindrical member (2) as shown in FIG. . The outer cylindrical member (1) and the inner cylindrical member (2) inserted and arranged in the actuator (3) as described above, strain gauges (5) (6) (13) (14) described below, and Thus, the load detecting device (18) of the present embodiment is constituted. The load detecting device (18), the brake pedal (28) and the input member (25) described below constitute a brake pedal force detecting device (20) of the present embodiment.

This embodiment will be described in detail below. The outer cylindrical member (1) is formed into a bottomed cylindrical shape as shown in FIG. 2, and a pair of substantially rectangular shapes are formed on the inner side surface (4) thereof. The strain gauges (5) and (6) are fixedly arranged in parallel to each other in the axial direction of the outer cylindrical member (1) and 180 ° symmetrically.

Further, the inner cylindrical member (2) shown in FIG. 3 is formed in a bottomed cylindrical shape having a size that can be inserted into the outer cylindrical member (1). Further, a projecting rod (10) having a diameter larger than that of the opening (8) of the outer cylindrical member (1) is formed in the opening (7) of the inner cylindrical member (2). An intermediate rod (11) having a slightly smaller diameter than the inner periphery of the outer cylindrical member (1) is projected from the bottom side of (10). Similarly to the outer cylindrical member (1), a pair of substantially rectangular strain gauges (13) and (14) are also provided on the outer surface (12) of the inner cylindrical member (2) in the axial direction of the inner cylindrical member (2). In addition, they are fixedly arranged in parallel with each other with 180 ° symmetry. In addition, a U-shaped notch (15) is formed in the protruding collar (10) of the inner cylindrical member (2) as shown in FIG.

The inner cylindrical member (2) formed as described above is inserted into the outer cylindrical member (1) as shown in FIG. Here, when the inner cylindrical member (2) is inserted and arranged, a pair of strain gauges (5) and (6) provided on the inner surface (4) of the outer cylindrical member (1) as shown in FIG. The assembly position of the inner cylindrical member (2) is adjusted so that the pair of strain gauges (13) and (14) provided on the outer surface (12) of (2) face each other.

In this manner, the strain gauges (5), (6), (13), and (14) of the outer cylindrical member (1) and the inner cylindrical member (2) are arranged 180 degrees symmetrically, and each of the outer cylindrical members (1) is arranged. By disposing the strain gauges (5) and (6) and the strain gauges (13) and (14) of the inner cylindrical member (2) facing each other, the outer cylindrical member (1) and the inner cylindrical member (2) The strain generated in the outer cylindrical member (1) and the inner cylindrical member (2) is more uniform and accurate without any deviation in the mounting positions of the strain gauges (5), (6), (13), and (14). It becomes possible to detect.

  In this embodiment, as described above, the strain gauges (5), (6), (13), and (14) are attached to the inner surface (4) of the outer cylindrical member (1) and the outer surface (12) of the inner cylindrical member (2). However, as another embodiment, the strain gauges (5), (6), (13) and (14) are arranged on the outer cylindrical member (1) and the outer surface (12) of the inner cylindrical member (2). It is also possible to arrange each of them, and in this case, it is easy to attach the strain gauges (5) (6) (13) (14) to the outer cylindrical member (1) and the inner cylindrical member (2). It can be.

In this embodiment, only a pair of strain gauges (5), (6), (13), and (14) are disposed on the outer cylindrical member (1) and the inner cylindrical member (2), respectively, but other different embodiments are provided. Alternatively, a plurality of pairs of strain gauges (5), (6), (13), and (14) may be arranged, and a plurality of pairs of strain gauges (5), (6), (13), and (14) may be arranged. As a result, distortion can be detected at a larger number of locations than in the case of the present embodiment, so that the distortion detection accuracy can be further improved.

Further, as described above, a pair of strain gauges (5), (6), (13), and (14) are arranged on the inner surface (4) of the outer cylindrical member (1) and the outer surface (12) of the inner cylindrical member (2), respectively. Therefore, a bridge circuit (32) as shown in FIG. 6 can be formed by using each of the pair of strain gauges (5), (6), (13) and (14) as a resistance pair, and the outer cylindrical member (1 ) And the distortion generated in the inner cylindrical member (2) can be accurately detected.

Further, a cable (16) of a pair of strain gauges (5), (6), (13), and (14) respectively provided on the outer cylindrical member (1) and the inner cylindrical member (2) is connected to the inner cylindrical member (2). It is inserted and arranged outwardly from a notch (15) provided in the. Further, when the inner cylindrical member (2) is inserted and arranged in the outer cylindrical member (1) as described above, the protruding flange (10) of the inner cylindrical member (2) is connected to the opening ( Since the diameter is larger than that of 8), as shown in FIG. 5, the protruding rod (10) of the inner cylindrical member (2) is engaged with the opening (8) of the outer cylindrical member (1). . Then, by fixing the protruding rod (10) of the inner cylindrical member (2) to the opening (8) of the outer cylindrical member (1), the opening (7) of the inner cylindrical member (2) and the outer cylindrical member The opening (8) of (1) is connected and fixed.

When the outer cylindrical member (1) and the inner cylindrical member (2) are connected and fixed as described above, the outer peripheral surface (17) of the intermediate rod (11) of the inner cylindrical member (2) as shown in FIG. Abuts against the inner surface (4) of the outer cylindrical member (1), and a strain interval (between the inner surface (4) of the outer cylindrical member (1) and the outer surface (12) of the inner cylindrical member (2)). 21) is formed. Further, as described above, the protruding flange (10) of the inner cylindrical member (2) engages with the opening (8) of the outer cylindrical member (1), whereby the inner peripheral bottom surface (22) of the outer cylindrical member (1). Similarly, a strain interval (21) is formed between the outer peripheral bottom surface (23) of the inner cylindrical member (2). The strain interval (21) is an interval that can accept the strain deformation of the outer cylindrical member (1) and the inner cylindrical member (2) generated when a load is applied from the input member (25) below. Means.

  Therefore, as shown in FIG. 5, all the strain gauges (5), (6), (13), and (14) fixedly arranged on the inner cylindrical member (2) and the outer cylindrical member (1) are placed in the strain interval (21). Will be located. Accordingly, the strain gauges (5), (6), (13), and (14) are not exposed to the outside of the outer cylindrical member (1) and the inner cylindrical member (2), and the outer cylindrical member (1) and the inner cylindrical member ( 2), the strain gauges (5), (6), (13) and (14) can be prevented from being damaged due to contact with other parts in the actuator (3) below. It becomes possible to maintain a highly accurate strain measurement with the strain gauges (5), (6), (13), and (14) over a long period of time.

The outer cylindrical member (1) and the inner cylindrical member (2) connected and fixed as described above are arranged in the actuator (3) as shown in FIG. That is, the outer cylindrical member (1) and the inner cylindrical member (2) with the openings (7) and (8) of the outer cylindrical member (1) and the inner cylindrical member (2) facing the input member (25). Is arranged in parallel with the actuator (3), and the bottom (24) of the outer cylindrical member (1) is fixed so as not to move in the actuator (3). As described above, the outer cylindrical member (1) and the inner cylindrical member (2) in which the strain gauges (5), (6), (13), and (14) are arranged in the actuator (3) are inserted and arranged. The strain gauges (5), (6), (13), and (14) are not exposed to the outside of (3), and the problem of interference with peripheral parts located outside the actuator (3) can be prevented. It becomes possible.

And the front-end | tip part (26) of the input member (25) is inserted and arrange | positioned at the bottom part in the inner side cylindrical member (2) of the load detection apparatus (18) fixedly arranged in the actuator (3) as mentioned above. As shown in FIG. 1, this input member (25) is constituted by a push rod (29) connected to the brake pedal (28), and is horizontally connected from the connecting portion with the brake pedal (28). It is arranged. Then, when the brake pedal (28) is depressed, the input member (25) moves in the horizontal direction, and the inner periphery of the inner cylindrical member (2) is loaded by the load from the tip (26) of the input member (25). The bottom surface (27) can be pressed. The load input to the actuator (3) is detected as described above, and the brake pedal force can be acquired by regarding the load as the pedal force applied to the brake pedal (28).

A mechanism for detecting a load from the brake pedal (28) in the brake pedal force detection device (20) of the present embodiment configured as described above will be described below. First, the brake pedal (28) is depressed in the direction indicated by the arrow in FIG. Thereby, the load from the brake pedal (28) is transmitted to the input member (25), and the input member (25) moves in the horizontal direction toward the actuator (3). Then, due to the load from the distal end portion (26) of the input member (25), the inner peripheral bottom surface (27) of the inner cylindrical member (2) disposed in the actuator (3) is loaded from the input member (25). Is pressed in the axial direction of the inner cylindrical member (2), which is the input direction.

As described above, the inner peripheral bottom surface (27) of the inner cylindrical member (2) is pressed in the input direction of the load from the input member (25), whereby the side wall (30) of the inner cylindrical member (2) is It extends in the input direction of the load from the input member (25), that is, in the axial direction of the inner cylindrical member (2). At the same time, the bottom (24) of the outer cylindrical member (1) connected and fixed to the inner cylindrical member (2) via the openings (7) and (8) is connected to the actuator (3) as described above. Since it is fixed so as not to move, the side wall (31) of the outer cylindrical member (1) is pressed by the input member (25) in the input direction of the load from the input member (25), that is, the outer cylindrical member ( It will be compressed in the axial direction of 1).

In addition, between the inner cylindrical member (2) and the outer cylindrical member (1), the inner cylindrical member (2) and the outer cylindrical member (1) are subjected to distortion deformation caused by the pressing of the input member (25). A strain interval (21) having an acceptable size is formed. Therefore, even when the side wall (30) of the inner cylindrical member (2) expands as described above and the side wall (31) of the outer cylindrical member (1) is compressed, the inner cylindrical member (2) and the outer cylindrical member (1 ) And will not come into contact. Therefore, since the load from the front end portion (26) of the input member (25) is surely reflected by the strain deformation of the inner cylindrical member (2) and the outer cylindrical member (1), the strain is detected. Thus, the load from the brake pedal (28) can be accurately measured.

When the inner cylindrical member (2) and the outer cylindrical member (1) are expanded and compressed by the load from the input member (25) as described above, the inner cylindrical member (2) and the outer cylindrical member (1) The strain gauges (5), (6), (13), and (14) disposed on the side walls (30) and (31) of the inner cylinder member detect the extension strain of the inner cylindrical member (2) and the compressive strain of the outer cylindrical member (1). . Each pair of strain gauges (5), (6), (13) and (14) has a strain gauge formed by a bridge circuit (32) using these strain gauges (5), (6), (13) and (14) as resistors. (5) (6) (13) (14) is output as an output voltage corresponding to the resistance change, and the pedaling force of the brake pedal (28) is increased by the output of the strain gauges (5) (6) (13) (14). It becomes possible to detect with high accuracy.

As described above, the brake pedal force detection device of the present embodiment can detect the distortion of the inner cylindrical member (2) and the outer cylindrical member (1) caused by the load from the distal end portion (26) of the input member (25). Therefore, the load from the input member (25) can be detected with high accuracy without receiving an offset load as in the prior art. Further, as described above, the strain gauges (5), (6), (13) in which the expansion and compression in the axial direction of the inner cylindrical member (2) and the outer cylindrical member (1) are arranged in the same direction as the expansion and compression directions. Since it is measured by (14), each distortion of the inner cylindrical member (2) and the outer cylindrical member (1) can be detected with higher accuracy. Further, by accurately detecting the load input to the actuator (3) as described above, it is possible to obtain the brake pedaling force by regarding the detection result as the pedaling force applied to the brake pedal (28). is there.

In this embodiment, a pair of strain gauges (5), (6), (13), and (14) are provided in the axial direction of the inner cylindrical member (2) and the outer cylindrical member (1), respectively. Since the load from the brake pedal (28) is measured by detecting both of these, even if the pedaling force is small, a plurality of distortions generated in the inner cylindrical member (2) and the outer cylindrical member (1) are detected. It is possible to detect at a location, and the detection accuracy can be increased.

1 outer cylindrical member 2 inner cylindrical member 3 actuator 4 inner surface
5, 6, 13, 14 Strain gauge 7, 8 Opening 12 Outer surface 18 Load detection device 20 Brake pedal force detection device 21 Strain interval 25 Input member
26 Tip 28 Brake pedal 30, 31 Side wall

Claims (5)

  A load detection device that is provided between an input member and an actuator that generates a braking force and detects a load that is input from the brake pedal to the actuator via the input member. A cylindrical member is disposed, and an inner cylindrical member having a bottom is inserted inside the outer cylindrical member with a strain interval between the inner cylindrical member and the inner periphery of the outer cylindrical member. By connecting and fixing the opening of the outer cylindrical member, inserting the tip of the input member into the inner cylindrical member, and receiving the load from the tip of the input member at the bottom of the inner cylindrical member, The side wall of the inner cylindrical member extends in the input direction of the load from the input member and the side wall of the outer cylindrical member that connects the inner cylindrical member and the opening is the input direction of the load from the input member. Compressing and compressing strain of the outer cylindrical member and stretching strain of the inner cylindrical member on the inner surface or outer surface of the inner cylindrical member and outer cylindrical member in a pair or plural pairs in the input direction of the load from the input member. A load detection device characterized in that it can be measured by a strain gauge arranged. The strain gauges are provided at equal intervals in the circumferential direction of the side wall of the outer cylindrical member and the inner cylindrical member, and the strain gauges of the outer cylindrical member and the strain gauges of the inner cylindrical member are arranged to face each other. The load detection device according to claim 1.   The load detection device according to claim 1 or 2, wherein the strain gauges are provided on an inner surface of the outer cylindrical member and an outer surface of the inner cylindrical member, respectively.   The load detection device according to claim 1 or 2, wherein the strain gauges are provided on an outer surface of the outer cylindrical member and an outer surface of the inner cylindrical member, respectively.   A brake pedal force detection device for detecting a brake pedal force, comprising the load detection device according to any one of claims 1 to 4, comprising the load detection device, the brake pedal, and the input member, A brake pedaling force detecting device characterized in that a brake pedaling force is acquired by regarding a load detected by a load detector as a pedaling force applied to the brake pedal.