Brake torque sensor

Abstract

This invention relates to a brake torque sensor, comprising: an elongated axial hole in the brake arm for sensing the displacement of the brake element's hinge shaft along the direction of the braking friction force during braking, which varies with the magnitude of the braking friction force, and converting the sensed displacement into a corresponding deformation on the connecting plate; and a tension / compression sensor for converting the deformation of the connecting plate caused by braking into force information and transmitting this force information outward as an electrical or digital signal. The brake torque sensor of this invention provides detection results consistent with actual results, enabling timely detection of unexpected brake conditions, alerting supervisors and maintenance personnel to promptly eliminate brake malfunctions and safety hazards, and preventing safety accidents caused by reduced or lost braking torque, thus contributing to safe production.

Description

Technical Field

[0001] The invention relates to a braking torque sensor, in particular to a brake braking torque sensor. Background Art

[0002] At present, a braking torque detection device installed on an electric hydraulic arm disc brake is a pressure sensor for the working pressure of a brake spring installed in a spring box where the brake spring is installed. The working pressure of the brake spring is basically equivalent to the positive pressure when the brake disc of the brake applies friction braking to the brake disc. By multiplying the value of the positive pressure by the friction coefficient between the brake disc and the brake disc, the magnitude of the friction force exerted by the brake disc on the brake disc can be obtained. Combined with the radius of the brake disc, the braking torque of the brake can be obtained, thereby realizing the detection of the brake torque of the brake.

[0003] This detection method can only detect the magnitude of the braking torque of the electric hydraulic arm disc brake under normal working conditions. Once the brake arm of the brake is stuck, the working pressure of the brake spring still exists and has not changed. At this time, the braking torque detection device can still obtain a normal braking torque detection result, but in fact the brake has no braking force at this time. In addition, if the friction plate on the brake disc falls off, at this time, since the working pressure of the brake spring still exists, the braking torque detection device will also issue a normal braking torque detection result. In the case of oil dripping, water dripping or friction overheating on the brake disc causing the friction coefficient between the brake discs to change, the braking torque detection device will still issue a normal braking torque detection result.

[0004] The reason for the appearance of these braking torque detection results that are inconsistent with the actual situation is that the braking torque detection device uses the positive pressure to calculate the braking friction force, but cannot truly detect the magnitude of the braking friction force. Therefore, it is inevitable that the detection results are inconsistent with the actual results. The fundamental purpose of setting up the braking torque detection device is to be able to detect unexpected conditions of the brake in a timely manner to avoid the subsequent safety accidents and minimize or even avoid the significant loss of people's lives and property. Summary of the invention

[0005] The purpose of the present invention is to provide a brake torque sensor to solve the problem that the detection result of the braking torque may not be consistent with the fact under unexpected circumstances.

[0006] The object of the present invention is achieved in this way: a brake torque sensor, comprising:

[0007] An oblong shaft hole is provided on the brake arm for carrying the hinge shaft of the brake element, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake element at a position at the same height as the axis of the hinge shaft of the brake element when the brake is applied, so that the hinge shaft of the brake element can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the brake is applied;

[0008] The connecting plate is a plate-shaped body, one end of which is fixed to the brake arm of the brake, and the other end is sleeved on the hinge shaft of the brake element through a closed hole or an open groove, so that the axis of the hinge shaft of the brake element is located at the longitudinal center of the oblong shaft hole of the brake arm in a static state, so that a suspended connection is formed between the brake element and the brake arm; the connecting plate is used to sense the braking displacement generated by the hinge shaft of the brake element in the oblong shaft hole when the brake is applied, and to generate corresponding plate deformation on the connecting plate; and

[0009] The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

[0010] The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensor is arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake arm of the brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

[0011] The connecting plate is a rectangular plate body, and its fixed end fixed on the brake arm of the brake is a short side end. Rectangular slots are respectively opened on the two long sides of the connecting plate body close to the fixed end. The two rectangular slots have the same size and are symmetrically distributed on the connecting plate. The tension and compression sensor is arranged on the bottom surface of the rectangular slot. After the connecting plate is installed on the brake arm of the brake, the long center line of the connecting plate is perpendicular to the long center line of the oblong axial hole.

[0012] The closed hole is a circular hole with a diameter slightly larger than the diameter of the hinge shaft of the brake element, or an oblong hole with a radius slightly larger than the radius of the hinge shaft of the brake element; the length of the oblong hole is perpendicular to the length of the oblong shaft hole of the brake arm after the connecting plate is installed on the brake arm.

[0013] The open slot is an open oblong hole with a semicircular opening removed, and the length direction of the open slot is perpendicular to the length direction of the oblong shaft hole of the brake arm after the connecting plate is installed on the brake arm.

[0014] When the brake element on the brake clamps the braked element on the device to implement the brake, the friction braking is realized by the friction between the braked element and the braked element. The magnitude of the brake torque actually reflects the magnitude of the friction force. When the brake is applied, the displacement of the brake element hinge shaft in the oblong shaft hole on the brake arm along the direction of the friction force is proportional to the magnitude of the friction force. Therefore, as long as the braking displacement of the brake element hinge shaft can be detected and converted into detection data that can reflect the magnitude of the friction force, the detection of the brake friction force is realized. Combined with the radius of the brake element (i.e., the force arm of the friction force), the magnitude of the brake torque can be obtained. That is, when the brake element is applied, the positive pressure applied to clamp the brake element (cylindrical brake drum or disc-shaped brake disc, etc.) multiplied by the friction coefficient between the brake element and the braked element is the friction force generated when the brake is applied. As long as the braking friction force can be detected, the real-time detection of the brake torque can be realized.

[0015] The present invention opens the shaft hole of the hinge shaft of the brake element on the brake arm into an elongated circular shaft hole, and realizes a suspended connection between the brake element and the brake arm through a connecting plate, so that when the brake is applied, the hinge shaft of the braked element can generate a braking displacement that changes with the change of the braking friction force; and the connecting plate can well sense this displacement, and can convert the sensed braking displacement into the plate deformation of the connecting plate, and then the tension and compression sensor converts the plate deformation on the connecting plate into an electrical signal of the force magnitude, and sends the electrical signal outward, thereby realizing real-time detection of the brake friction force, and also realizing real-time detection of the brake torque. This is the key to the present invention.

[0016] The present invention can also be implemented as follows: A brake torque sensor, comprising:

[0017] An oblong shaft hole is provided on the brake shoe of the outer-holding brake for passing the brake shoe articulation axis, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake shoe at the same height as the axis of the brake shoe articulation axis when the brake is applied, so that the brake shoe can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the outer-holding brake is applied;

[0018] The connecting plate is a plate-shaped body, the upper end of which is sleeved on the hinge shaft of the brake shoe block through a circular shaft hole, and the lower end of which is hinged on the side wall of the brake shoe block through hole-shaft matching, so that the axis of the hinge shaft of the brake shoe block is located at the long center position of the oblong shaft hole of the brake shoe block in a static state, so that a suspended connection is formed between the brake shoe block and the brake arm; the connecting plate is used to sense the braking displacement generated by the brake shoe block along the direction of the friction force when the outer-holding block brake is braked, and to generate corresponding plate deformation on the connecting plate; and

[0019] The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

[0020] The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensors are arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake shoe block of the external block brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

[0021] The present invention can also be implemented as follows: A brake torque sensor, comprising:

[0022] An oblong shaft hole is provided on the brake shoe of the arm disc brake for passing the hinge shaft of the brake shoe, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake shoe at the same height as the axis of the hinge shaft of the brake shoe when the brake is applied, so that the brake shoe can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the arm disc brake is applied;

[0023] The connecting plate is a plate-shaped body, the lower end of which is sleeved on the brake pad hinge shaft extending between the two ribs on the back of the brake pad through a circular shaft hole, and the upper end of which has a through hole sleeved on the pin shaft arranged between the two ribs on the back of the brake pad, so that the connecting plate is longitudinally arranged in the groove formed between the two ribs on the back of the brake pad, so that a suspension connection is formed between the brake pad and the brake arm; the connecting plate is used to sense the braking displacement generated by the brake pad along the direction of the friction force when the arm disc brake is braked, and generate corresponding plate deformation on the connecting plate; and

[0024] The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

[0025] The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensor is arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake pad of the arm disc brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

[0026] The present invention overcomes the false alarm phenomenon that the existing braking torque sensor cannot detect the braking friction force of the brake, resulting in the detection result being inconsistent with the actual situation in the event of an unexpected brake situation. Since it is a real-time detection of the brake friction force, the detection result can change with the change of the friction coefficient between the braking element and the braked element, and is consistent with the actual situation. Therefore, the unexpected condition of the brake can be detected in time, and the supervision and maintenance personnel can be reminded to eliminate the failure and safety hazard of the brake in time, avoiding the safety accidents caused by the reduction or disappearance of the braking torque of the brake, which is conducive to achieving safe production, the safe use of production and transportation equipment, and ensuring the safety of people’s lives and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an arm disc brake.

[0028] Figure 2 It is a structural schematic diagram of embodiment 1 of the braking torque sensor of the present invention.

[0029] Figure 3 , Figure 4 Schematic diagram of the structure of two connecting plates used in Example 1.

[0030] Figure 5 It is a structural schematic diagram of embodiment 2 of the braking torque sensor of the present invention.

[0031] Figure 6 , Figure 7 Schematic diagram of the structure of two connecting plates used in Example 2.

[0032] Figure 8 It is a structural schematic diagram of embodiment 3 of the braking torque sensor of the present invention.

[0033] Fig. 9 It is a structural schematic diagram of embodiment 4 of the braking torque sensor of the present invention.

[0034] Fig.10 It is a schematic diagram of the structure of the brake shoe block in Example 4.

[0035] Fig.11 It is a top view of the braking torque sensor embodiment 5 of the present invention.

[0036] Fig.12 It is a schematic diagram of the lateral structure of the brake shoe in Example 5.

[0037] Fig.13 It is a schematic diagram of the partial structure of Example 5.

[0038] In the figure: 1, brake arm, 2, brake shoe articulation axis, 3, oblong axis hole, 4, connecting plate, 5, closed hole, 6, open groove, 7, tension and compression sensor, 8, brake shoe, 9, brake shoe articulation axis, 10, brake drum, 11, rectangular notch, 12, brake shoe, 13, rib plate, 14, pin shaft. DETAILED DESCRIPTION

[0039] Embodiment 1:

[0040] This embodiment is a brake torque sensor suitable for arm disc brakes, which includes an oblong shaft hole provided on the brake arm, a connecting plate connecting the brake arm and the brake shoe, and a tension and compression sensor arranged on the connecting plate.

[0041] exist Figure 1 In the arm-disk brake shown, the axial hole on the brake arm 1 for carrying the brake pad articulation shaft 2 is designed to be an oblong axial hole 3, and the length direction of the oblong axial hole 3 is consistent with the direction of the friction force on the friction surface of the brake pad at the same height as the axis of the brake pad articulation shaft 2 during braking. In this way, when the arm-disk brake is braking, under the action of the braking friction force, the brake pad articulation shaft 2 can move upward or downward along its length in the oblong axial hole 3 of the brake arm 1 to form a braking displacement. The specific up and down movement direction is related to the rotation direction of the braked element - the brake disc, and the size of this braking displacement is proportional to the positive pressure applied by the arm-disk brake to the brake disc during braking and the product of the friction coefficient between the brake pad and the brake disc.

[0042] The connecting plate 4 is a plate-shaped structural component used to detect the braking displacement of the brake shoe articulated shaft. Figure 3 , Figure 4 As shown, the specific structure of the connecting plate 4 is that two slits parallel to the short sides of the plate body are opened on the plate surface of a rectangular plate body, and the opening directions of the two slits are opposite, so that the plate surface of the connecting plate is divided into three relatively independent and sequentially connected parts, thereby making the connecting plate 4 form an S-shaped plate body with a rectangular outline. A closed hole 5 ( Figure 3 ) or open slot 6 ( Figure 4 The closed hole 5 can be a circular hole with a diameter slightly larger than the diameter of the hinge shaft of the brake pad, or a long circular hole with a radius slightly larger than the radius of the hinge shaft of the brake pad. The long direction of the long circular hole is perpendicular to the long direction of the long circular shaft hole 3 of the brake arm after the connecting plate 4 is installed on the brake arm 1 ( Figure 2 ).

[0043] The closed hole 5 or the open slot 6 is opened at one end of the connecting plate body. When the upper end of the connecting plate 4 is fixed to the brake arm 1 of the brake, the closed hole 5 or the open slot 6 at the lower end of the plate body is sleeved on the brake shoe hinge shaft 2, and the long center line of the plate body is kept coincident or substantially coincident with the long center line of the oblong shaft hole 3 on the brake arm 1 ( Figure 2 ).

[0044] Figure 2 In the embodiment, a connecting plate 4 of an S-shaped plate is installed on each inner side of two groups (i.e., four) of brake arms 1 of the arm disc brake. The two connecting plates 4 are symmetrically arranged, and the upper end of the connecting plate 4 is fixed on the inner side of the brake arm 1. The lower end of the connecting plate 4 is sleeved on the brake pad hinge shaft 2 through the closed hole 5, so that the axis of the brake pad hinge shaft is located at the longitudinal center of the oblong shaft hole 3 of the brake arm 1 in a static state, thereby forming a suspended connection between the brake pad and the brake arm 1 through the connecting plate 4. When the brake is applied, the brake pad hinge shaft 2 will generate a braking displacement together with the brake pad, and the connecting plate 4 connected thereto can feel this braking displacement and generate a corresponding plate deformation on the connecting plate 4.

[0045] Figure 2 In the figure, the tension and compression sensor 7 is fixed at the middle position of the connecting plate surface, which is the best position for the connecting plate to produce plate deformation. The tension and compression sensor 7 converts the plate deformation caused by the braking action on the connecting plate into force information, and sends the force information to the outside in the form of an electrical signal or a digital signal. The force information can be regarded as the friction force generated by the brake when braking. The braking torque of the brake can be obtained by multiplying the braking friction force with the radius of the brake disc.

[0046] Embodiment 2:

[0047] like Figure 5 As shown, this embodiment is also applicable to a brake torque sensor on an arm disc brake, and its basic structure is substantially the same as that of embodiment 1, except that the specific structure and installation position of the connecting plate are different.

[0048] like Figure 6 , Figure 7 As shown, in this embodiment, the connecting plate 4 is a rectangular plate body, and its fixed end fixed to the brake arm 1 is a short side end. Rectangular notches 11 are respectively opened on the two long sides of the connecting plate 4 close to the fixed end. The two rectangular notches have the same size and are symmetrically distributed on the connecting plate body, so that the plate body between the two rectangular notches presents a neck feature, which becomes the best position to sense the braking displacement and produce plate body deformation. Tension and compression sensors (not shown) are respectively arranged on the bottom surfaces of the two rectangular notches 11 of the connecting plate 4.

[0049] The connection plate 4 can be provided with a closed hole 5 ( Figure 6 ), and an opening slot 6 can also be opened ( Figure 7 ). The closed hole 5 or the open slot 6 is opened on the end of the connecting plate body opposite to the fixed end, and the opening of the open slot 6 is located on the short side of the connecting plate 4. The closed hole 5 can be a circular hole with a diameter slightly larger than the diameter of the hinge shaft of the brake pad, or it can be an oblong hole with a radius slightly larger than the radius of the hinge shaft of the brake pad, and the long direction of the oblong hole is perpendicular to the long direction of the oblong shaft hole 3 of the brake arm after the connecting plate 4 is installed on the brake arm 1. The open slot 6 is an open oblong hole with a semicircular hole removed, and the long direction of the open slot is perpendicular to the long direction of the oblong shaft hole 3 on the brake arm after the connecting plate 4 is installed on the brake arm 1 ( Figure 5 ).

[0050] Figure 5 In the embodiment, after the connecting plate 4 is installed on the brake arm 1 of the brake, the longitudinal center line of the connecting plate 4 is perpendicular to the longitudinal center line of the oblong shaft hole 3. In this way, by installing one of the above connecting plates 4 on the inner side surfaces of the two groups of brake arms 1 of the arm disc brake, the two connecting plates 4 installed on each group of brake arms are symmetrically arranged, one end of the connecting plate 4 is fixed on the side edge of the brake arm 1, and the other end of the connecting plate 4 is sleeved on the brake shoe hinge shaft 2 through an open groove (or a closed hole), so that the axis of the brake shoe hinge shaft is located at the longitudinal center position of the oblong shaft hole 3 of the brake arm 1 in a static state, so that the brake shoe and the brake arm 1 are suspended and connected through the connecting plate 4. Since the brake pad hinge shaft 2 is lifted up laterally by the connecting plate 4, the axial end of the brake pad hinge shaft 2 is located in the long middle part of the oblong axial hole 3 of the brake arm. When the brake is applied, the brake pad hinge shaft 2 will generate a vertical braking displacement together with the brake pad. In this way, the braking displacement can be felt on the connecting plate 4, and a plate deformation corresponding to the braking displacement is generated on the bottom surface of the rectangular notch of the connecting plate 4. The tension and compression sensor arranged on the bottom surface of the rectangular notch 11 can convert the plate deformation into force information, and send the force information to the outside in the form of an electrical signal or a digital signal.

[0051] Embodiment 3:

[0052] This embodiment is a brake torque sensor suitable for an outer-holding brake, which includes an oblong shaft hole provided on a brake arm, a connecting plate connecting the brake arm and the brake shoe, and a tension and compression sensor arranged on the connecting plate.

[0053] exist Figure 8In the outer block brake shown, a brake element, namely, a brake shoe 8, is installed on each of the two brake arms 1. The shaft holes on the two brake arms 1 for carrying the brake shoe articulation shaft 9 are designed to be oblong shaft holes 3. The length direction of the oblong shaft hole 3 is consistent with the direction of the friction force on the friction surface of the brake shoe at the same height as the axis of the brake shoe articulation shaft 9 during braking. In this way, when the outer block brake is applied, under the action of the braking friction force, the brake shoe articulation shaft 9 can move upward or downward along its length in the oblong shaft hole 3 of the brake arm 1, thereby forming a braking displacement. The specific up and down movement direction is related to the rotation direction of the braked element, namely, the brake drum 10, and the magnitude of this braking displacement is proportional to the product of the positive pressure applied by the outer block brake to the brake drum during braking and the friction coefficient between the brake shoe and the brake drum.

[0054] The structure of the connecting plate 4 in this embodiment is the same as that of the connecting plate in Embodiment 1, and will not be described in detail.

[0055] Figure 8 In the embodiment, an S-shaped connecting plate 4 is installed on the outer sides of the two brake arms 1 of the outer block brake, and the two connecting plates 4 on each brake arm 1 are symmetrically arranged, and the two connecting plates 4 on the same side of the two brake arms are also symmetrically arranged. The upper end of the connecting plate 4 is arranged on the outer wall of the brake arm 1 by bolt fixing or convex shaft hinge, and the lower end of the connecting plate 4 is sleeved on the brake shoe block hinge shaft 9 through a circular closed hole with a diameter slightly larger than the hinge shaft diameter, so that the axis of the brake shoe block hinge shaft 9 is located at the longitudinal center of the oblong shaft hole 3 of the brake arm 1 in a static state, so that the brake shoe block 8 and the brake arm 1 are suspended through the connecting plate 4. Since the brake shoe block 8 is connected to the brake arm 1 through the connecting plate 4, and the axial end of the brake shoe block hinge shaft 9 is located in the longitudinal middle of the oblong shaft hole 3 of the brake arm, in this way, when the brake is applied, the connecting plate 4 can feel the braking displacement of the brake shoe block hinge shaft 9 and produce corresponding plate deformation on the connecting plate 4.

[0056] Figure 8 In the embodiment, the tension and compression sensor 7 is fixed at the middle position of the connecting plate surface, which is the best position for the connecting plate to produce plate deformation. The tension and compression sensor 7 converts the plate deformation caused by the braking action on the connecting plate into force information, and sends the force information to the outside in the form of electrical signals or digital signals.

[0057] Embodiment 4:

[0058] like Fig. 9As shown, this embodiment is also suitable for the brake torque sensor on the external block brake, which also constructs a suspended connection between the brake arm 1 and the brake shoe block 8 through the oblong axial hole 3 and the connecting plate 4, except that the oblong axial hole 3 opened on the brake arm 1 in Example 3 is changed to be opened on the brake shoe block 8. Of course, the connection method of the connecting plate 4 will also change accordingly.

[0059] like Fig. 9 As shown, the braking torque sensor of the present invention includes an oblong axial hole 3 opened on the brake shoe 8 of the brake, a connecting plate 4 connecting the brake arm 1 and the brake shoe 8, and a tension and compression sensor 7 arranged on the connecting plate 4.

[0060] exist Fig. 9 In the outer block brake shown in the figure, the shaft hole on the brake arm 1 for passing the brake shoe block hinge shaft is still a round hole, while the shaft hole opened on the brake shoe block 8 for passing the brake shoe block hinge shaft 9 is designed to be an oblong shaft hole 3 ( Fig.10 ), the length direction of the oblong axial hole 3 is consistent with the direction of the friction force on the friction surface of the brake shoe block at the same height as the axis of the brake shoe block hinge shaft when braking, so that when the external block brake is used, the brake shoe block can produce a displacement along the direction of the friction force that varies with the magnitude of the braking friction force.

[0061] The structure of the connecting plate 4 is the same as that of the connecting plate in the embodiment 3, but the installation orientation is opposite, that is, its upper end is sleeved on the brake shoe block hinge shaft 9 through a circular shaft hole, and its lower end is hinged on the side wall of the brake shoe block 8 through the cooperation of the circular hole and the convex shaft, so that the axis of the brake shoe block hinge shaft is located at the longitudinal center of the oblong shaft hole 3 of the brake shoe block 8 in a static state, so that a suspension connection is formed between the brake shoe block 8 and the brake arm 1. In this way, when the brake is applied, the connecting plate 4 can sense the braking displacement of the brake shoe block 8 and produce corresponding plate deformation on the connecting plate 4.

[0062] Fig. 9 In the embodiment, the tension and compression sensor 7 is fixed in the middle of the connecting plate 4, which is the best position for the connecting plate to produce plate deformation. The tension and compression sensor 7 converts the plate deformation caused by the braking action on the connecting plate 4 into force information, and sends the force information to the outside in the form of electrical signals or digital signals.

[0063] Embodiment 5:

[0064] like Fig.11As shown, this embodiment is a brake torque sensor suitable for an arm disc brake, which also constructs a suspended connection between the brake arm 1 and the brake pad 12 through an oblong axial hole 3 and a connecting plate 4, except that the oblong axial hole 3 opened on the brake arm 1 in Embodiment 1 is changed to be opened on the brake pad 12. Of course, the setting and connection method of the connecting plate 4 will also change accordingly.

[0065] like Fig.11 As shown, the braking torque sensor of the present invention includes an oblong axial hole 3 opened on the brake shoe 12 of the brake, a connecting plate 4 connecting the brake arm 1 and the brake shoe 12, and a tension and compression sensor 7 arranged on the connecting plate 4.

[0066] exist Fig.11 In the arm-disk brake shown in the figure, the axial hole on the brake arm 1 for passing the brake shoe hinge shaft is still a round hole, while the axial hole opened on the brake shoe 12 for passing the brake shoe hinge shaft is designed to be an oblong axial hole 3 ( Fig.12 ), the length direction of the oblong axial hole 3 is consistent with the direction of the friction force on the friction surface of the brake pad at the same height as the axis of the brake pad hinge shaft when braking, so that when the arm disc brake is braked, the brake pad 12 can produce a displacement along the direction of the braking friction force that varies with the magnitude of the braking friction force.

[0067] The structure of the connecting plate 4 is the same as that of the connecting plate in the first embodiment, except that its thickness is increased and the installation position is changed. Fig.13 As shown, the lower end of the connecting plate 4 is sleeved on the brake pad hinge shaft 2 extending between the two vertical ribs 13 on the back of the brake pad 12 through a circular shaft hole, and the upper end of the connecting plate 4 is provided with a through hole, which is sleeved on the pin 14, and the pin 14 is inserted on the two ribs 13 on the back of the brake pad, so that the connecting plate 4 can be longitudinally arranged in the groove formed between the two ribs 13 on the back of the brake pad, and a suspension connection is formed between the brake pad 12 and the brake arm 1. In this way, when the brake is applied, the connecting plate 4 can feel the braking displacement generated by the brake pad 12 along the direction of the braking friction force, and a corresponding plate deformation is generated on the connecting plate 4.

[0068] Fig.11 In the embodiment, after the connecting plate 4 is mounted on the brake shoe 12 of the arm disc brake, the longitudinal center line of the connecting plate 4 coincides with the longitudinal center line of the oblong shaft hole 3 on the brake shoe 12 ( Fig.11 ).

[0069] Fig.11In the embodiment, the tension and compression sensor 7 is fixed at the middle of the plate surface of the connecting plate 4, which is the best position for the connecting plate 4 to produce plate deformation. The tension and compression sensor 7 converts the plate deformation generated by the braking action on the connecting plate 4 into force information, and sends the force information to the outside in the form of electrical signals or digital signals.

Claims

1. A brake torque sensor, characterized in that: include: An oblong shaft hole is provided on the brake arm for carrying the hinge shaft of the brake element, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake element at a position at the same height as the axis of the hinge shaft of the brake element when the brake is applied, so that the hinge shaft of the brake element can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the brake is applied; The connecting plate is a plate-shaped body, one end of which is fixed on the brake arm of the brake, and the other end is sleeved on the brake element hinge shaft through a closed hole or an open groove, so that the axis of the brake element hinge shaft is located at the longitudinal center of the oblong shaft hole of the brake arm in a static state; the connecting plate is used to sense the braking displacement generated by the brake element hinge shaft in the oblong shaft hole when the brake is applied, and to generate corresponding plate body deformation on the connecting plate; as well as The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

2. The brake torque sensor according to claim 1, characterized in that: The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensor is arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake arm of the brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

3. The brake torque sensor according to claim 1, characterized in that: The connecting plate is a rectangular plate body, and its fixed end fixed on the brake arm of the brake is a short side end. Rectangular slots are respectively opened on the two long sides of the connecting plate body close to the fixed end. The two rectangular slots have the same size and are symmetrically distributed on the connecting plate. The tension and compression sensor is arranged on the bottom surface of the rectangular slot. After the connecting plate is installed on the brake arm of the brake, the long center line of the connecting plate is perpendicular to the long center line of the oblong axial hole.

4. The brake torque sensor according to claim 2 or 3, characterized in that: The closed hole is a circular hole with a diameter slightly larger than the diameter of the hinge shaft of the brake element, or an oblong hole with a radius slightly larger than the radius of the hinge shaft of the brake element; the length of the oblong hole is perpendicular to the length of the oblong shaft hole of the brake arm after the connecting plate is installed on the brake arm.

5. The brake torque sensor according to claim 2 or 3, characterized in that: The open slot is an open oblong hole with a semicircular opening removed, and the length direction of the open slot is perpendicular to the length direction of the oblong shaft hole of the brake arm after the connecting plate is installed on the brake arm.

6. A brake torque sensor, characterized in that: include: An oblong shaft hole is provided on the brake shoe of the outer-holding brake for passing the brake shoe articulation axis, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake shoe at the same height as the axis of the brake shoe articulation axis when the brake is applied, so that the brake shoe can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the outer-holding brake is applied; The connecting plate is a plate-shaped body, the upper end of which is sleeved on the hinge shaft of the brake shoe block through a circular shaft hole, and the lower end of which is hinged on the side wall of the brake shoe block through hole-shaft matching, so that the axis of the hinge shaft of the brake shoe block is located at the center of the length of the oblong shaft hole of the brake shoe block in a static state; the connecting plate is used to sense the braking displacement generated by the brake shoe block along the direction of the friction force when the outer-holding block brake is braked, and to generate corresponding plate deformation on the connecting plate; as well as The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

7. The brake torque sensor according to claim 6, characterized in that: The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensors are arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake shoe block of the external block brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

8. A brake torque sensor, characterized in that: include: An oblong shaft hole is provided on the brake shoe of the arm disc brake for passing the hinge shaft of the brake shoe, wherein the length direction of the oblong shaft hole is consistent with the direction of the friction force on the friction surface of the brake shoe at the same height as the axis of the hinge shaft of the brake shoe when the brake is applied, so that the brake shoe can generate a displacement along the direction of the friction force that varies with the magnitude of the braking friction force when the arm disc brake is applied; The connecting plate is a plate-shaped body, the lower end of which is sleeved on the brake pad hinge shaft extending between the two ribs on the back of the brake pad through a circular shaft hole, and the upper end of which is sleeved on the pin shaft arranged between the two ribs on the back of the brake pad, so that the connecting plate is longitudinally arranged in the groove formed between the two ribs on the back of the brake pad; the connecting plate is used to sense the braking displacement generated by the brake pad along the direction of the friction force when the arm disc brake is braked, and to generate corresponding plate body deformation on the connecting plate; as well as The tension and compression sensor is fixed on the connecting plate surface at the best position that can produce the above-mentioned plate deformation, and is used to convert the plate deformation caused by braking on the connecting plate into force information, and send the force information outward in the form of electrical signals or digital signals.

9. The brake torque sensor according to claim 8, characterized in that: The connecting plate is an S-shaped plate body with a rectangular profile. The tension and compression sensor is arranged in the middle of the plate surface of the connecting plate. After the connecting plate is installed on the brake pad of the arm disc brake, the long center line of the connecting plate coincides with the long center line of the oblong axial hole.

Images