A mechanical displacement detection mechanism suitable for closed oil chamber brake

Abstract

The present invention discloses a mechanical displacement detection mechanism suitable for a closed oil chamber brake, comprising a primary installation sleeve and an oil plug assembly fixedly sleeved outside the primary installation sleeve, wherein a push rod is provided in the primary installation sleeve along the axial movable seal to penetrate the front and rear, and the front end of the push rod is movably connected with a primary measuring rod and a secondary measuring rod in sequence, and the front end of the primary installation sleeve is movably installed with a secondary installation sleeve threadedly sleeved on the push rod. The present invention realizes three different measurement states by changing the relative positions of the primary measuring rod, the secondary measuring rod and the secondary installation sleeve, and can be used as a traditional straight-through mechanical displacement detection mechanism, and can compensate for the radial position difference between the installation oil port and the detectable end face of the piston, so as to perform visual low-cost displacement detection without changing the initial structure of the oil chamber, thereby completing the piston stroke detection, the initial installation clearance detection of the friction pair and the wear condition detection of the friction pair, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of brake detection, and in particular to a mechanical displacement detection mechanism suitable for a closed oil chamber brake. Background Art

[0002] The internal structure of wet brake products is a closed oil chamber structure. During the design process, it is necessary to differentiate the selection of friction pair components according to the braking torque of the application product. The friction pair components include the moving plate and the fixed plate. In the original state, the two need to maintain a certain installation gap to avoid jamming. In order to ensure a suitable installation gap, it is necessary to measure and feedback through the stroke of the piston. In addition, in the actual application of wet brakes, it is sometimes necessary to measure whether the moving plate and the fixed plate have abnormal problems caused by jamming due to installation gap problems after long-term use, or whether there are problems such as friction pair wear to the limit, which also requires measurement and feedback through the stroke of the piston.

[0003] For some wet brakes, due to the particularity of the oil chamber structure design, there is a radial position difference or block between the installation oil port in the oil chamber and the detectable end face of the piston, which makes it impossible for the traditional straight-through mechanical displacement detection mechanism to directly contact the detectable end face of the piston by inserting the installation oil port to perform stroke measurement feedback. In addition, due to the closed working mode limitation of the wet brake, it is also impossible to re-open a hole at a suitable position on the oil chamber housing to meet the measurement use of the straight-through mechanical displacement detection mechanism. As a result, the reciprocating stroke of the piston cannot be detected by traditional mechanical measurement methods.

[0004] Based on the structural characteristics of wet brakes: a wide ambient temperature bandwidth, a certain pressure in the oil chamber and a closed space where oil and air are mixed, the tested piston frequently reciprocates, and the measurement module and the wet brake body must meet the sealing performance requirements. Therefore, customized highly integrated sensors with good matching and reliability requirements, such as inductive sensors, are very expensive compared to integrated LVDT transmitters using the differential inductance principle. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and to propose a mechanical displacement detection mechanism suitable for a closed oil chamber brake, which can compensate for the radial position difference between the installation oil port and the detectable end face of the piston and has excellent sealing performance. It can perform visual and low-cost displacement detection without changing the initial structure of the oil chamber, thereby completing piston stroke detection, friction pair initial installation clearance detection, and friction pair wear detection, etc.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A mechanical displacement detection mechanism suitable for a closed oil chamber brake, comprising a primary mounting sleeve and an oil plug assembly fixedly sleeved outside the primary mounting sleeve, a push rod penetrating the front and rear being movably sealed in the axial direction inside the primary mounting sleeve, a primary measuring rod and a secondary measuring rod being movably connected to the front end of the push rod in sequence, and a secondary mounting sleeve threadedly sleeved on the push rod being movably mounted on the front end of the primary mounting sleeve;

[0008] In the initial state, the secondary installation sleeve is connected to the primary installation sleeve, the primary measuring rod and the secondary measuring rod overlap, and the rear end of the primary measuring rod is retracted in the secondary installation sleeve;

[0009] In the first limiting state, the secondary mounting sleeve is connected to the primary mounting sleeve, and the push rod, the primary measuring rod and the secondary measuring rod are perpendicular to each other in sequence;

[0010] In the second limiting state, the secondary mounting sleeve is separated from the primary mounting sleeve, and the push rod, the primary measuring rod and the secondary measuring rod are perpendicular to each other in sequence.

[0011] Furthermore, a plurality of curved grooves are evenly distributed along the circumferential direction on the outer circumferential surface of the secondary mounting sleeve, the depth of the curved grooves decreases in a clockwise direction, and a plurality of elastic balls corresponding to the curved grooves are embedded inside the front end of the primary mounting sleeve.

[0012] Furthermore, the rear end of the first-level measuring rod is hinged with a spherical hinge support, and the front end of the push rod is provided with an integrally formed spherical joint, and the spherical joint is hinged on the spherical hinge support; a pre-stretched first spring is connected between the rear part of the first-level measuring rod and the front part of the push rod, and a first limit assembly is provided between the first-level measuring rod and the secondary mounting sleeve, and the first limit assembly is suitable for limiting the first-level measuring rod to be perpendicular to the push rod.

[0013] Furthermore, the front end of the secondary mounting sleeve is evenly provided with a plurality of square grooves with a width greater than the thickness of the primary measuring rod along the circumferential direction, the first limiting assembly adopts a telescopic pin elastically installed on the inner side of the square groove, and the primary measuring rod is provided with a first slot corresponding to the telescopic pin, and when the telescopic pin is inserted into the first slot, the primary measuring rod is perpendicular to the push rod.

[0014] Furthermore, the primary measuring rod and the secondary measuring rod are hinged, and a pre-compressed second spring is connected between the two near the hinge. A second limit assembly is provided between the primary measuring rod and the secondary measuring rod, and the second limit assembly is suitable for limiting the secondary measuring rod to be perpendicular or overlapping with the primary measuring rod.

[0015] Furthermore, the second limiting assembly is a boss elastically mounted on the first-level measuring rod and located in the area where the first-level measuring rod and the second-level measuring rod always overlap, and the second-level measuring rod is provided with two second slots respectively corresponding to the boss, and the two second slots are perpendicular to the line connecting the hinge points of the first-level measuring rod and the second-level measuring rod.

[0016] Furthermore, the front end of the secondary measuring rod is provided with an integrally formed measuring plane.

[0017] Furthermore, a first annular groove is provided on the inner wall of the first-stage mounting sleeve, a pre-compressed third spring is provided in the first annular groove, a rear end of the third spring is fixedly connected to the rear end of the first annular groove, and a front end is abutted against the second-stage mounting sleeve.

[0018] Furthermore, the push rod is engraved with an axial scale along the length direction, and the rear end of the first-level mounting sleeve is engraved with a radial scale along the circumferential direction.

[0019] Furthermore, the oil plug assembly includes an oil plug body, the outer peripheral surface of which is provided with a step that matches the mounting oil hole of the brake, and the step is sleeved with a first sealing ring with an oblate cross-section; the inner wall of the first-level mounting sleeve is provided with a second annular groove, and the second annular groove is provided with a second sealing ring with a circular cross-section.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects:

[0021] (1) The present invention realizes a sealed connection with the mounting oil hole through an oil plug assembly, and realizes three different measuring states by changing the relative positions of the primary measuring rod, the secondary measuring rod and the secondary mounting sleeve. When in the initial state, it can be used as a traditional straight-through mechanical displacement detection mechanism. When in the first limit state, it can compensate for the radial position difference between the mounting oil port and the detectable end face of the piston, thereby performing visual and low-cost displacement detection without changing the initial structure of the oil chamber, thereby completing piston stroke detection, friction pair initial installation clearance detection and friction pair wear condition detection, etc. When in the second limit state, the secondary mounting sleeve is separated from the primary mounting sleeve, so that the push rod can be inserted deeper into the sealed oil chamber, satisfying the displacement detection when the axial distance between the mounting oil port and the detectable end face of the piston is large and there is a radial position difference, further expanding the application scenario.

[0022] (2) The present invention realizes the connection between the secondary mounting sleeve and the primary mounting sleeve by inserting an elastic ball into the curved groove. Due to the change in the depth of the curved groove, when the push rod is rotated clockwise, the elastic ball on the secondary mounting sleeve is driven to rotate counterclockwise relative to the curved groove, thereby inserting into the curved groove to achieve the fixation of the secondary mounting sleeve and the primary mounting sleeve. When the push rod is rotated counterclockwise, the elastic ball on the secondary mounting sleeve is driven to rotate clockwise relative to the curved groove, thereby disengaging from the curved groove, thereby achieving the separation of the secondary mounting sleeve and the primary mounting sleeve.

[0023] (3) The first-level mounting sleeve of the present invention realizes a fully free movable connection with the push rod through a spherical hinge support and a spherical joint. When the first-level measuring rod is pushed out of the second-level mounting sleeve by the push rod, the first-level measuring rod is provided with a pulling force by the pre-stretched first spring, and the first-level measuring rod is pulled up and kept perpendicular to the push rod under the action of the first limit assembly.

[0024] (4) The present invention is provided with a square groove. When the primary measuring rod is pushed out from the secondary mounting sleeve, it can just enter the square groove, and the telescopic pin is used as the first limiting component to be clamped into the first clamping groove to achieve limiting. The structural design is ingenious.

[0025] (5) The present invention provides a pre-compressed second spring between the primary measuring rod and the secondary measuring rod. When the primary measuring rod is pushed out by the push rod, the secondary measuring rod is "thrown away" by inertia. Under the action of the second spring, the secondary measuring rod rotates counterclockwise around the hinge point and remains perpendicular to the primary measuring rod under the action of the second limit assembly.

[0026] (6) The second limiting assembly of the present invention adopts a boss elastically mounted on the primary measuring rod, and the boss is respectively inserted into two second slots to achieve limiting, thereby ensuring that the secondary measuring rod overlaps or is perpendicular to the primary measuring rod.

[0027] (7) The present invention sets a measuring plane at the front end of the secondary measuring rod to increase the contact area with the measured end face and facilitate use.

[0028] (8) The present invention provides a pre-compressed third spring to provide a larger thrust for the secondary mounting sleeve, so that it can be smoothly separated from the primary mounting sleeve, thereby improving the structural stability.

[0029] (9) The present invention can intuitively reflect the piston stroke displacement through the axial scale, and can intuitively reflect the rotation stroke of the push rod along the circumferential direction by setting the radial scale, thereby ensuring that the first-level measuring rod can be smoothly inserted into the square groove of the second-level mounting sleeve, and at the same time, it is convenient to adjust the relative position of the first-level mounting sleeve and the second-level mounting sleeve to ensure smooth separation.

[0030] (10) The cross-section of the first sealing ring of the present invention is an oblate structure, which has an excellent static sealing effect. The cross-section of the second sealing ring is a circular structure, which ensures the sealing performance while not affecting the movement of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0032] Figure 1 It is a partial structural schematic diagram of the closed oil chamber brake of Example 1;

[0033] Figure 2 A perspective view of the present invention;

[0034] Figure 3 For the present invention Figure 2 A local enlarged view of point A in FIG.

[0035] Figure 4 is a cross-sectional view of the present invention;

[0036] Figure 5 For the present invention Figure 4 A local enlarged view of point B in FIG.

[0037] Figure 6 This is a diagram showing the initial state of the mechanical displacement detection mechanism of the present invention;

[0038] Figure 7 This is a diagram of the first limit state of the mechanical displacement detection mechanism of the present invention;

[0039] Figure 8 This is a diagram of the second limit state of the mechanical displacement detection mechanism of the present invention.

[0040] The reference numerals in the accompanying drawings are:

[0041] Primary mounting sleeve 1, second annular groove 1-1, elastic ball 1-2, first annular groove 1-3, oil plug assembly 2, oil plug body 2-1, first sealing ring 2-2, step 2-3, push rod 3, spherical joint 3-1, second sealing ring 4, primary measuring rod 5, first clamping groove 5-1, boss 5-2, secondary measuring rod 6, second clamping groove 6-1, measuring plane 6-2, secondary mounting sleeve 7, square groove 7-1, telescopic pin 7-2, curved groove 7-3, spherical hinge support 8, first spring 9, second spring 10, third spring 11;

[0042] Housing 100 , parking spring 101 , steel sheet 102 , piston 103 , friction pair assembly 104 , and mounting oil hole 105 . DETAILED DESCRIPTION

[0043] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] (Example 1)

[0045] like Figure 1 The enclosed oil chamber brake shown in the figure includes a housing 100 and a parking spring 101, a steel sheet 102, a piston 103 and a friction pair assembly 104 which are sequentially installed in the housing 100 along the axial direction. The parking spring 101 presses the steel sheet 102 to push the piston 103 to move, thereby driving the friction pair assembly 104 to achieve braking. An installation oil hole 105 is provided at the left end of the housing 100. Due to the structural design requirements, a stopper is provided axially between the installation oil hole 105 and the steel sheet 102 and the distance is relatively far. At the same time, there is a position difference between the steel sheet 102 and the installation oil hole 105 in the radial direction. In order to perform visual and low-cost displacement detection on the basis of not changing the initial structure of the sealed oil chamber formed by the housing 100, a mechanical displacement detection mechanism is installed at the existing installation oil hole 105, so as to complete the stroke detection of the piston 103, the initial installation clearance detection of the friction pair assembly 104 and the wear condition detection of the friction pair assembly 104, etc.

[0046] Specifically, Figures 2 to 8 The mechanical displacement detection mechanism suitable for a closed oil chamber brake shown in the figure comprises a primary mounting sleeve 1 and an oil plug assembly 2 fixedly sleeved on the primary mounting sleeve 1 by threaded connection. The oil plug assembly 2 comprises an oil plug body 2-1 and a first sealing ring 2-2. A step 2-3 matching the mounting oil hole 105 is provided on the outer peripheral surface of the oil plug body 2-1. The first sealing ring 2-2 is sleeved on the step 2-3 to achieve a sealed connection with the mounting oil hole 105. The cross section of the first sealing ring 2-2 is an oblate circle, which increases the axial contact area with the mounting oil hole 105 and improves the sealing effect.

[0047] A push rod 3 is coaxially arranged in the primary installation sleeve 1 and runs through the front and rear, and the outer wall of the push rod 3 is gap-matched with the inner wall of the primary installation sleeve 1. A second annular groove 1-1 is arranged on the inner wall of the primary installation sleeve 1, and a second sealing ring 4 sleeved on the push rod 3 is arranged in the second annular groove 1-1. The cross section of the second sealing ring 4 is circular, which ensures the sealing performance and does not affect the movement of the push rod 3, thereby realizing that the push rod 3 is axially movable and sealed in the primary installation sleeve 1.

[0048] The front end of the push rod 3 is movably connected with the primary measuring rod 5 and the secondary measuring rod 6 in sequence, and the front end of the primary mounting sleeve 1 is movably mounted with the secondary mounting sleeve 7, which is movably sleeved on the push rod 3 through a threaded connection. Specifically, the front end of the push rod 3 is provided with an integrally formed spherical joint 3-1, and the rear end of the primary measuring rod 5 is provided with a spherical hinge support 8 adapted to the spherical joint 3-1. The primary measuring rod 5 is hinged to the spherical hinge support 8 through a mounting pin, and is hinged to the spherical hinge support 8 through the spherical joint 3-1, so as to realize the full-freedom movable connection between the primary measuring rod 5 and the push rod 3. A pre-stretched first spring 9 is connected between the rear part of the primary measuring rod 5 and the front part of the push rod 3 to provide tension for the primary measuring rod 5 and pull the primary measuring rod 5 to stand up. The front end of the secondary mounting sleeve 7 is uniformly provided with a plurality of square grooves 7-1 with a width greater than the thickness of the primary measuring rod 5 along the circumferential direction, and a telescopic pin 7-2 is elastically installed on the inner side of each square groove 7-1. As a first limiting component, the primary measuring rod 5 is provided with a first card slot 5-1 corresponding to the telescopic pin 7-2, and when the primary measuring rod 5 is erected, the first card slot 5-1 and the telescopic pin 7-2 are located on the same horizontal line, so that when the telescopic pin 7-2 is inserted into the first card slot 5-1, the primary measuring rod 5 is perpendicular to the push rod 3.

[0049] The front end of the primary measuring rod 5 and the rear end of the secondary measuring rod 6 are hinged by a mounting pin, thereby realizing a movable connection. A pre-compressed second spring 10 is connected between the two near the hinge to provide thrust for the secondary measuring rod 6, so that it rotates counterclockwise around the hinge point. A boss 5-2 is elastically installed on the primary measuring rod 5 as a second limiting component. The boss 5-2 is located in the area where the primary measuring rod 5 and the secondary measuring rod 6 always overlap during the rotation process. The secondary measuring rod 6 is provided with two second card slots 6-1 corresponding to the boss 5-2 respectively. The two second card slots 6-1 are perpendicular to the line connecting the hinge points of the primary measuring rod and the secondary measuring rod. The boss 5-2 is respectively inserted into the two second card slots 6-1 to realize the limit, ensuring that the secondary measuring rod 6 overlaps or is perpendicular to the primary measuring rod 6. The front end of the secondary measuring rod 6 is provided with an integrally formed measuring plane 6-2 to increase the contact area with the measured end face for easy use.

[0050] A plurality of curved grooves 7-3 are evenly distributed along the circumferential direction on the outer circumference of the secondary installation sleeve 7, and the depth of the curved grooves 7-3 decreases in the clockwise direction. A plurality of elastic balls 1-2 corresponding to the curved grooves 7-3 are embedded in the front end of the primary installation sleeve 1. When the secondary installation sleeve 7 rotates clockwise, the elastic balls 1-2 are inserted into the deepest part of the curved grooves 7-3, so that the secondary installation sleeve 7 and the primary installation sleeve 1 are locked and fixed. When the secondary installation sleeve 7 rotates counterclockwise, the elastic balls 1-2 rotate clockwise along the curved grooves 7-3 until they are disengaged from the curved grooves 7-3, so that the secondary installation sleeve 7 and the primary installation sleeve 1 are separated. The inner wall of the primary mounting sleeve 1 is provided with a first annular groove 1-3, and a pre-compressed third spring 11 is provided in the first annular groove 1-3. The rear end of the third spring 11 is fixedly connected to the rear end of the first annular groove 1-3, and the front end is abutted against the secondary mounting sleeve 7, providing a larger thrust for the secondary mounting sleeve 7. When the elastic ball 1-2 is separated from the curved groove 7-3, the secondary mounting sleeve 7 can be quickly ejected and separated smoothly.

[0051] The push rod 3 is engraved with an axial scale along the length direction, which can intuitively reflect the piston stroke displacement. The rear end of the first-level mounting sleeve 1 is engraved with a radial scale along the circumferential direction, which can intuitively reflect the rotation stroke of the push rod 3 along the circumferential direction, ensuring that the first-level measuring rod 5 can be smoothly inserted into the square groove 7-1 of the second-level mounting sleeve 7, and at the same time, it is convenient to adjust the relative position of the first-level mounting sleeve 1 and the second-level mounting sleeve 7 to ensure smooth separation.

[0052] The working principle of this embodiment:

[0053] In the initial state, the secondary mounting sleeve 7 is connected to the primary mounting sleeve 1 and is in a locked state, the primary measuring rod 5 and the secondary measuring rod 6 overlap and the rear end of the primary measuring rod 5 is retracted into the secondary mounting sleeve 1.

[0054] Rotate the push rod 3 clockwise. Since the secondary mounting sleeve 7 is locked, the push rod 3 moves toward the piston 103. The primary measuring rod 5 is pulled up by the first spring 9, rotates counterclockwise around the hinge point and runs into the square groove 7-1 of the secondary mounting sleeve 7. The telescopic pin 7-2 is inserted into the first slot 5-1, so that the primary measuring rod 5 is perpendicular to the push rod 3. At the same time, affected by inertia, the secondary measuring rod 6 is thrown away, and the boss 5-2 is disengaged from one of the second slots 6-1. Under the action of the second spring 10, the secondary measuring rod 6 rotates counterclockwise until the boss 5-2 is inserted into the other second slot 6-1, so that the primary measuring rod 5 and the secondary measuring rod 6 are perpendicular to each other. At this time, the entire mechanical displacement detection mechanism is in the first limit state.

[0055] When the push rod 3 is turned counterclockwise, since the friction force at the threaded connection between the push rod 3 and the secondary mounting sleeve 7 is much greater than the rolling friction force between the elastic ball 1-2 and the curved groove 7-3, the secondary mounting sleeve 7 also rotates counterclockwise with the push rod 3 until the primary mounting sleeve 7 is completely disengaged from the secondary mounting sleeve 9. The push rod 3, the secondary mounting sleeve 7, the primary measuring rod 5, and the secondary measuring rod 6 move unidirectionally along the axial direction under the action of the third spring 11. At this time, the entire mechanical displacement detection mechanism is in the second limit state.

[0056] In the second limit state, the push rod 3 is pushed to manually adjust the contact state between the measuring plane 6-2 and the steel sheet 102. When the brake is in the pressure relief state, the parking spring 101 pushes the steel sheet 102 to move axially, the steel sheet 102 pushes the piston 103 to move axially, and the piston 103 axially pushes the friction pair component 104 until the axial clearance is eliminated. At this time, the mechanical displacement detection mechanism reads the value through the axial scale on the push rod 3. In the pressurized state, the piston 103 moves in the reverse axial direction under the action of the hydraulic pressure, the piston 103 releases the force acting on the friction pair component 104, the piston 103 moves in the reverse axial direction under the action of the hydraulic pressure, pushes the steel sheet 102, the steel sheet 102 moves in the reverse axial direction, pushes the parking spring 101 until the limit position of the housing 100, and the mechanical displacement detection mechanism reads the value through the axial scale on the push rod 3. Thus, the piston stroke detection is performed without changing the structure of the wet brake. Similarly, the initial installation clearance detection of the friction pair and the wear condition detection of the friction pair can also be performed.

[0057] The present invention realizes a sealed connection with the mounting oil hole through an oil plug assembly, and realizes three different measuring states by changing the relative positions of the primary measuring rod 5, the secondary measuring rod 6 and the secondary mounting sleeve 7. When in the initial state, it can be used as a traditional straight-through mechanical displacement detection mechanism. When in the first limit state, it can compensate for the radial position difference between the mounting oil port and the detectable end face of the piston, thereby performing visual and low-cost displacement detection without changing the initial structure of the oil chamber, thereby completing piston stroke detection, friction pair initial installation clearance detection and friction pair wear detection, etc. When in the second limit state, the secondary mounting sleeve 7 is separated from the primary mounting sleeve 1, so that the push rod 3 can be inserted deeper into the sealed oil chamber, satisfying the displacement detection when the axial distance between the mounting oil port and the detectable end face of the piston is large and there is a radial position difference, further expanding the application scenario.

[0058] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical displacement detection mechanism suitable for a closed oil chamber brake, characterized in that: It comprises a primary installation sleeve and an oil plug assembly fixedly sleeved outside the primary installation sleeve, a push rod penetrating the front and rear is axially movable and sealed inside the primary installation sleeve, a primary measuring rod and a secondary measuring rod are movably connected to the front end of the push rod in sequence, and a secondary installation sleeve threadedly sleeved on the push rod is movably installed at the front end of the primary installation sleeve; In the initial state, the secondary installation sleeve is connected to the primary installation sleeve, the primary measuring rod and the secondary measuring rod overlap, and the rear end of the primary measuring rod is retracted in the secondary installation sleeve; In the first limiting state, the secondary mounting sleeve is connected to the primary mounting sleeve, and the push rod, the primary measuring rod and the secondary measuring rod are perpendicular to each other in sequence; In the second limiting state, the secondary mounting sleeve is separated from the primary mounting sleeve, and the push rod, the primary measuring rod and the secondary measuring rod are vertical in sequence; A plurality of curved grooves are evenly distributed along the circumferential direction on the outer circumferential surface of the secondary mounting sleeve, the depth of the curved grooves decreases in the clockwise direction, and a plurality of elastic balls corresponding to the curved grooves are embedded inside the front end of the primary mounting sleeve; The rear end of the primary measuring rod is hinged with a spherical hinge support, and the front end of the push rod is provided with an integrally formed spherical joint, and the spherical joint is hinged on the spherical hinge support; a pre-stretched first spring is connected between the rear part of the primary measuring rod and the front part of the push rod, and a first limit assembly is provided between the primary measuring rod and the secondary mounting sleeve, and the first limit assembly is suitable for limiting the primary measuring rod to be perpendicular to the push rod; The front end of the secondary mounting sleeve is uniformly provided with a plurality of square grooves with a width greater than the thickness of the primary measuring rod along the circumferential direction. The first limit assembly adopts a telescopic pin elastically installed inside the square groove. The primary measuring rod is provided with a first slot corresponding to the telescopic pin. When the telescopic pin is inserted into the first slot, the primary measuring rod is perpendicular to the push rod. The push rod is engraved with an axial scale along the length direction, and the rear end of the first-level mounting sleeve is engraved with a radial scale along the circumferential direction.

2. A mechanical displacement detection mechanism suitable for a closed oil chamber brake according to claim 1, characterized in that: The primary measuring rod and the secondary measuring rod are hinged, and a pre-compressed second spring is connected between the two near the hinge. A second limiting assembly is provided between the primary measuring rod and the secondary measuring rod, and the second limiting assembly is suitable for limiting the secondary measuring rod to be perpendicular or overlapping with the primary measuring rod.

3. A mechanical displacement detection mechanism suitable for a closed oil chamber brake according to claim 2, characterized in that: The second limiting component is a boss elastically mounted on the first-level measuring rod and located in the area where the first-level measuring rod and the second-level measuring rod always overlap. The second-level measuring rod is provided with two second slots corresponding to the bosses respectively, and the two second slots are perpendicular to the line connecting the hinge points of the first-level measuring rod and the second-level measuring rod.

4. The mechanical displacement detection mechanism for a closed oil chamber brake according to claim 1, characterized in that: An integrally formed measuring plane is provided at the front end of the secondary measuring rod.

5. The mechanical displacement detection mechanism for a closed oil chamber brake according to claim 1, characterized in that: The inner wall of the primary mounting sleeve is provided with a first annular groove, a pre-compressed third spring is provided in the first annular groove, the rear end of the third spring is fixedly connected to the rear end of the first annular groove, and the front end is abutted against the secondary mounting sleeve.

6. The mechanical displacement detection mechanism suitable for a closed oil chamber brake according to claim 1, characterized in that: The oil plug assembly includes an oil plug body, the outer peripheral surface of which is provided with a step that matches the mounting oil hole of the brake, and the step is sleeved with a first sealing ring with an oblate cross-section; the inner wall of the primary mounting sleeve is provided with a second annular groove, and the second annular groove is provided with a second sealing ring with a circular cross-section.

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