CN115013460B

CN115013460B - Linear travel alarm mechanism with adjustable initial position

Info

Publication number: CN115013460B
Application number: CN202210858106.XA
Authority: CN
Inventors: 许齐放; 许振飞; 张爱德
Original assignee: Linyi Hongtu Electron Co ltd
Current assignee: Linyi Hongtu Electron Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-06-16
Anticipated expiration: 2042-07-21
Also published as: CN115013460A

Abstract

The application discloses an initial position adjustable linear travel alarm mechanism, which belongs to a device for indicating the abrasion of a brake and is used for alarming the abrasion of the brake, and comprises an installation base connected with an inner shell through an inner shell placing hole, wherein a guide shaft is arranged in the inner shell and is in sliding connection with an ejector rod injection molding piece; the inner shell is also provided with a shaft body penetrating hole communicated with the inner shell cavity, an adjusting shaft is arranged in the shaft body penetrating hole, and the adjusting shaft comprises an adjusting bottom end, an adjusting top end and a middle shaft body. In view of the technical scheme, the method and the device can eliminate the measurement gap caused by the error of the brake, and can always keep the ejector rod in the initial state to be abutted on the brake assembly, so as to ensure the accuracy of indication alarm.

Description

Linear travel alarm mechanism with adjustable initial position

Technical Field

The application relates to a device for indicating brake wear, in particular to a linear travel warning mechanism with an adjustable initial position.

Background

Vehicle brakes can provide adequate safety for driving of the vehicle, and wear parts in the brakes, such as brake shoes in drum brakes and brake pads in disc brakes, lead to an increase in the braking time and braking distance of the vehicle as the vehicle mileage increases. It is difficult to determine the wear degree of the brake shoes or the brake linings by purely visual inspection, and when the brake shoes or the brake linings are worn to a certain degree, a wear alarm sensor is generally required to be additionally arranged to remind a driver to replace the brake shoes or the brake linings in time so as to ensure the driving safety.

For example, chinese patent publication No. CN108533647a discloses a wear warning device and a brake with the same, which are connected in an elastic fixing manner, in which a bending portion is formed in a wear portion of a warning harness, a margin is left between the bending portion and an upper end surface of the wear portion, and a start end and an end of the warning harness are both located in a connection end. The brake shoe will wear together with the wear part during braking, and after the alarm harness bent in the wear part is worn off, the control system of the vehicle will detect the broken wire loop signal and send an alarm signal to the operator. The wear alarm sensor can only realize the alarm when the brake pad is worn to a set degree, and has a relatively fixed structure and relatively poor flexibility.

For example, chinese patent publication No. CN112460174a discloses a brake, a brake shoe wear warning mechanism, a warning method, and an EBS system thereof, in which a warning device capable of warning and a measuring member extending as the thickness of a brake shoe becomes smaller are passed, the measuring member abuts against an abutting end of the brake shoe, a conductive area is arranged in a direction in which the measuring member extends, and a movable block capable of being moved on the conductive area by the measuring member and being moved outside the conductive area when the brake shoe fails, and the movable block, the conductive area, and the warning device are connected in series. However, the wear warning sensor disclosed in this document does not allow for self-adjustment, for example, the installation errors of the brake shoe during casting due to casting errors cannot be eliminated, resulting in poor adaptation of the adaptation process.

Disclosure of Invention

The utility model provides an aim at provides an initial position adjustable straight line stroke alarm mechanism, it can eliminate the measurement clearance that causes because of stopper self error, can keep the ejector pin butt under the initial condition on the brake subassembly all the time to guarantee the accuracy that the instruction reported to the police.

In order to achieve the above purpose, the present application is realized by the following technical scheme:

the linear travel alarm mechanism with the adjustable initial position comprises a mounting base and a push rod, wherein the push rod penetrates through the base and extends out, the push rod is connected with a push rod injection molding piece at the end position inside the base, the push rod injection molding piece is connected with a guide shaft in a sliding mode, and the guide shaft is located in an inner shell cavity of an inner shell and connected with the inner shell; the guide shaft between the ejector rod injection molding piece and the bottom end of the inner shell cavity is sleeved with a spring, an injection molding adjusting groove is formed in the top end of the end face, which is in contact with the spring, of the ejector rod injection molding piece, the injection molding adjusting groove is matched with the adjusting shaft, the top end of the adjusting shaft penetrates through the inner shell and the mounting base and then stretches out, an adjusting notch is formed in the position, stretching out of the adjusting shaft, of the mounting base, and the end, stretching out of the mounting base, of the adjusting shaft defines a self state with the mounting base through a pawl; the bottom of the ejector rod injection molding piece is provided with a circuit brush which slides along a resistance layer on the circuit board and enables the circuit board to externally output a continuous linear voltage signal or output a circuit on-off state; the circuit board is positioned at the bottom of the inner shell cavity, and the inner shell moves relative to the mounting base under the drive of the adjusting shaft.

Preferably, the adjusting shaft in the application has an adjusting bottom end, the adjusting bottom end is a shaft body with a plane, and when the adjusting bottom end rotates to the plane to be parallel to the side surface of the injection molding adjusting groove, the adjusting bottom end is positioned in the injection molding adjusting groove and separated from the injection molding adjusting groove; when the adjusting bottom end rotates to the plane to be perpendicular to the side face of the injection molding adjusting groove, the adjusting bottom end is contacted with the ejector rod injection molding piece at the opening position of the injection molding adjusting groove through the plane.

Preferably, the adjusting shaft is provided with an adjusting top end, and the adjusting top end extends out of a shaft body penetrating hole and an adjusting notch on the inner shell and is connected with the pawl; the middle shaft body is integrated with the adjusting top end and the adjusting bottom end, and the middle shaft body is matched with the shaft body penetrating hole.

Preferably, the adjusting notch is a bar-shaped hole, the pawl is provided with a tooth-shaped structure which is clamped with or separated from a pawl boss on the mounting base, and the pawl is connected with a shaft body clamping groove at the position of the adjusting top end through a shaft retainer ring.

Preferably, the mounting base is provided with an inner shell placing hole and an ejector rod extending hole, the inner shell is positioned in the inner shell placing hole, the inner shell placing hole is positioned at the end part of the mounting base far away from the ejector rod extending hole, and the mounting base is provided with base hanging lugs integrated with the mounting base at the positions of two sides; the ejector rod extends out after penetrating through an ejector rod extending hole in the mounting base, and the ejector rod extending hole is communicated with the inner shell placing hole.

Preferably, an elliptical seal is arranged outside the inner shell, and the elliptical seal is positioned at the connecting position of the inner shell and the inner shell placing hole; an ejector rod copper sleeve is arranged in the ejector rod extending hole, an O-shaped ring B is arranged between the ejector rod copper sleeve and the ejector rod extending hole, and the O-shaped ring B is in contact with the ejector rod penetrating through the ejector rod copper sleeve; an adjusting shaft copper sleeve is arranged in the shaft body penetrating hole, an O-shaped ring A is arranged between the adjusting shaft copper sleeve and the shaft body penetrating hole, and the O-shaped ring A is in contact with an adjusting shaft penetrating through the shaft body penetrating hole.

Preferably, in the present application, the bottom of the inner housing cavity is a circuit board caulking groove, and a circuit board is placed in the circuit board caulking groove; the circuit board is provided with a conductive layer which is contacted with the circuit brush and extends out of the inner shell and the mounting base through a wire.

Preferably, the conductive layer is a resistance layer for adjusting the output resistance according to the sliding of the circuit brush, and the circuit board is provided with a signal processing module for outputting the voltage linearly.

Preferably, in this application be provided with flexible gasket between inner housing and the hole is placed to the inner shell, flexible gasket is located the axis body and wears out in the hole and the adjustment axle from flexible gasket.

Compared with the prior art, the beneficial effects of this application are:

the brake shoe can be flexibly adjusted after replacement, the measurement gap caused by casting errors of the brake shoe is overcome while the contact of the ejector rod and the brake shoe is ensured, the accuracy requirement from the initial point of the sensor to the alarm point is ensured, and the accuracy of indication alarm is improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present application.

Fig. 2 is a schematic diagram of the overall structure of the present application.

Fig. 3 is a top view of the present application.

Fig. 4 is a cross-sectional view of section A-A of fig. 3.

Fig. 5 is a schematic view of the structure of the mounting base in the present application.

Fig. 6 is a schematic diagram of a second structure of the mounting base in the present application.

Fig. 7 is a schematic view of the structure of the inner housing in the present application.

Fig. 8 is a schematic diagram of the inner housing in the present application.

Fig. 9 is a schematic structural view of the adjustment shaft in the present application.

Fig. 10 is a schematic structural view of the ejector pin, the ejector pin injection molding member and the adjusting shaft assembly in the present application.

FIG. 11 is a schematic diagram of a second embodiment of the ejector pin, ejector pin injection molding, and adjustment shaft assembly of the present application.

FIG. 12 is a schematic illustration of the fit of the ejector pin, ejector pin injection molding, and adjustment shaft assembly, inner housing.

In the figure: 1. a mounting base; 2. an inner housing; 3. a push rod; 4. a guide shaft; 5. a spring; 6. an adjustment shaft; 7. adjusting a shaft copper sleeve; 8. a pawl; 9. a circuit brush; 10. a push rod copper sleeve; 11. a circuit board; 12. a flexible gasket; 13. an O-shaped ring A; 14. an O-shaped ring B; 15. elliptical sealing; 16. a retainer ring for the shaft; 17. ejector rod injection molding; 18. an inner housing placement hole; 19. adjusting the notch; 20. base lugs; 21. injection molding an adjusting groove; 22. the ejector rod extends out of the hole; 23. an inner housing cavity; 24. a circuit board caulking groove; 25. an inner shell seal groove; 26. the shaft body penetrates out of the hole; 27. adjusting the bottom end; 28. adjusting the top end; 29. the shaft body is clamped with the groove; 30. a middle shaft body; 31. pawl boss.

Detailed Description

The technical scheme described in the application is further described and illustrated below with reference to the accompanying drawings. The directional terms referred to in the description are merely for convenience of those skilled in the art in understanding the technical solutions described in the present application in terms of the visual orientations shown in the drawings. Unless specifically stated or limited otherwise, the terms "set up," "mounted," "connected," and the like are to be construed broadly, and the specific meaning of the terms in this application will be understood by those of ordinary skill in the art, as appropriate.

An initial position-adjustable linear travel warning mechanism is provided with a mounting base 1 with a structure shown in fig. 5 and 6, two sides of the mounting base 1 are provided with base lugs 20 integrated with the mounting base, and the base lugs 20 are provided with through holes or threaded holes and can be fixed on a brake by means of screws and the like. The two ends of the mounting base 1 are respectively provided with an inner shell placing hole 18 and a push rod extending hole 22, and the inner shell placing hole 18 is communicated with the push rod extending hole 22. The top of the inner shell placing hole 18 is provided with an adjusting notch 19 formed by a strip-shaped notch, the mounting base 1 at the position of the adjusting notch 19 is provided with a pawl boss 31 integrated with the adjusting notch, and the pawl boss 31 extends in the direction of the adjusting notch 19. The inner shell placement hole 18 and the ejector pin extension hole 22 may be coaxially disposed. The longitudinal section of the detent boss 31 may be trapezoidal.

As shown in fig. 1 to 4, the inner housing 2 is provided inside the inner housing placement hole 18. The structure of the inner housing 2 is as shown in fig. 7 to 8, and the cross-sectional shape of the inner housing 2 is the same as that of the inner housing placement hole 18. One end of the inner shell 2 is plugged, the other end of the inner shell is open, an inner shell cavity 23 for accommodating the guide shaft 4, the ejector rod 3, the ejector rod injection molding piece 17 and the circuit board 11 and a circuit board caulking groove 24 are formed in the inner shell 2, and the circuit board caulking groove 24 is positioned at the bottom of the inner shell cavity 23 and is communicated with the inner shell cavity 23.

The top of the inner shell 2 is provided with a shaft body penetrating hole 26, and the shaft body penetrating hole 26 is correspondingly arranged with the adjusting notch 19. The inner shell 2 is provided with an inner shell sealing groove 25 at one end far away from the shaft body penetrating hole 26, an elliptical seal 15 is embedded in the inner shell sealing groove 25, and the elliptical seal 15 is positioned between the inner shell 2 and the inner shell placing hole 18.

As shown in fig. 4, an adjustment shaft copper bush 7 is provided inside the shaft body insertion hole 26, and an O-ring a13 is provided between the bottom of the adjustment shaft copper bush 7 and the shaft body insertion hole 26. The shaft body penetrating hole 26, the adjusting shaft copper sleeve 7 and the O-shaped ring A13 are internally provided with the adjusting shaft 6 in a penetrating way. The structure of the adjusting shaft 6 is shown in fig. 9, and the adjusting shaft comprises a middle shaft body 30 matched with the ejector rod extending hole 22, the bottom end of the middle shaft body 30 is an adjusting bottom end 27 integrated with the middle shaft body, a step structure is formed between the adjusting bottom end 27 and the middle shaft body 30, and the step structure is contacted with the bottom end of the adjusting shaft copper sleeve 7. The top end of the middle shaft body 30 is an integral adjusting top end 28, a shaft body clamping groove 29 is processed at the position of the adjusting top end 28, and the shaft body clamping groove 29 is used for being matched with the shaft retainer ring 16 to fix the pawl 8. The adjusting bottom end 27 is provided with a planar structure on the circumferential surface, and the adjusting bottom end 27 can smoothly enter the injection molding adjusting groove 21 in the following section through the planar structure, and can be contacted with the ejector rod injection molding piece 17 at the position through the planar structure after being separated from the injection molding adjusting groove 21. The pawl 8 at the top end of the adjusting shaft 6 can be clamped with the pawl boss 31 or the mounting base 1 at the position under the condition of self deformation, so that the movement of the adjusting shaft 6 is avoided.

As shown in fig. 10 to 12, the guide shafts 4 are symmetrically disposed on two sides of the inner housing cavity 23, the ejector rod injection molding piece 17 is slidably connected to the guide shafts 4, the spring 5 is sleeved on the guide shafts 4 between the ejector rod injection molding piece 17 and the inner housing cavity 23, and the spring 5 provides a force generated by deformation in the process of moving the ejector rod injection molding piece 17 along the guide shafts 4. Meanwhile, due to the fact that the inner space of the inner shell cavity 23 is limited, the moving distance of the ejector rod 3 containing the ejector rod injection molding piece 17 in the inner shell cavity 23 can be increased by the aid of the structural mode of the guide shaft 4, and the ejector rod 3 is guaranteed to have enough movable travel.

The middle part of the ejector rod injection molding piece 17 is provided with the tail end of the ejector rod 3 connected with the ejector rod injection molding piece, and the abutting end of the ejector rod 3 passes through the ejector rod extending hole 22 on the mounting base 1 and then extends out. The ejector rod injection molding piece 17 is fixed with a circuit brush 9 towards the end face of the circuit board 11, the circuit brush 9 can form a passage on a conductive layer on the circuit board 11, an open circuit is formed after the circuit brush 9 moves out of the conductive layer on the circuit board 11, and the circuit board 11 can be connected with a control circuit/control unit on a vehicle through a wire so as to realize detection of the passage and the open circuit through the control circuit/control unit and further realize the function of monitoring the wear amount of a brake shoe of the vehicle. Meanwhile, as a supplement to the scheme, the conductive layer can be a resistance layer with a carbon film, the resistance layer can adjust and output different resistance values along with the sliding of the electric brush on the resistance layer, and meanwhile, a signal processing module for outputting different linear voltage signals according to the change of the resistance values is also arranged on the circuit board 11, and the signal processing module comprises an operational amplifier U2, and the carbon film is electrically connected with the operational amplifier 12. The circuit board 11 is a PCB board, and may have pins or terminals connected to the alarm circuit/control unit of the automobile itself, or may be connected to the alarm circuit/control unit of the automobile itself through wires with pins or terminals.

In this application, the ejector pin injection molding piece 17 is provided with an injection molding adjusting groove 21 on the top surface of the end part facing the position of the adjusting shaft 6, the injection molding adjusting groove 21 is a strip-shaped notch, and the bottom surface of the injection molding adjusting groove is lower than the bottom surface of the adjusting shaft 6. When the planar structure of the adjusting bottom end 27 is flush with the side surface of the injection molding adjusting groove 21, the adjusting bottom end 27 can enter the injection molding adjusting groove 21 along with the movement of the middle shaft body 30 and the adjusting top end 28. When the adjusting bottom end 27 is located outside the injection adjusting groove 21 and the planar structure is driven by the middle shaft body 30 and the adjusting top end 28 to rotate to be level with the end surface of the ejector rod injection molding piece 17, the adjusting bottom end 27 can contact with the end surface of the ejector rod injection molding piece 17 through the planar surface, so that the adjusting shaft 6 is convenient to drive the ejector rod injection molding piece 17 to move together.

The ejector rod extending hole 22 is a stepped hole, the ejector rod copper sleeve 10 is arranged in the ejector rod extending hole 22, an O-shaped ring B14 is arranged between the ejector rod copper sleeve 10 and the stepped structure of the ejector rod extending hole 22, and the O-shaped ring B14 can be in contact with the ejector rod 3. As shown in fig. 4, a flexible spacer 12 is disposed between the inner housing 2 and the inner housing placement hole 18, and the flexible spacer 12 can avoid movement between the inner housing 2 and the inner housing placement hole 18, and can also provide a certain assistance for the pawl 8 connected to the adjustment shaft 6, so that the pawl 8 can be clamped with the mounting base 1 or the pawl boss 31 at the location through the tooth-like structures on both sides.

The both sides processing of pawl 8 in this application have a plurality of heliciform structures to the heliciform structure of pawl 8 both sides can buckle downwards and with the mounting base 1 or the pawl boss 31 contact of buckling position department below, when the in-process of pawl 8 vibration or other exogenic action takes place to remove, pawl 8 can be pricked to mounting base 1 or pawl boss 31 through the heliciform structure of both sides buckling downwards, and then guarantees the stability of pawl 8 in the vibration in-process.

After the brake shoe of the brake is assembled or replaced with the brake, in order to eliminate the gap existing due to the replacement of the brake shoe, the ejector rod 3 is ensured to be abutted against the brake shoe, the pawl 8 is released manually or by using a tool, the adjusting shaft 6 is rotated, the plane structure of the adjusting bottom end 27 in the adjusting shaft 6 is contacted with the ejector rod injection molding piece 17, the adjusting shaft 6 is pushed to drive the ejector rod injection molding piece 17 to move in the extending direction of the ejector rod 3 through the adjusting bottom end 27, meanwhile, the inner shell 2 is driven to move in the extending direction of the ejector rod 3 together in the inner shell placing hole 18, when the abutting end of the ejector rod 3 is contacted with the brake shoe, the adjusting shaft 6 is rotated manually or by using the tool, the plane structure of the adjusting bottom end 27 is leveled with the side surface of the injection molding adjusting groove 21, and the pawl 8 is connected with the adjusting shaft 6 through the shaft retainer ring 16 and pressed on the pawl boss 31 at the corresponding position on the mounting base 1.

In the adjusting process, the adjusting shaft 6 drives the inner shell 2 and the ejector rod injection molding piece 17 to move together relative to the mounting base 1, and the distance between the inner shell 2 and the ejector rod injection molding piece 17 is relatively unchanged, so that the initial contact position of the circuit brush 9 and the circuit board 11 is kept unchanged, and the abrasion alarm displacement of the circuit brush 9 driven by the ejector rod 3 and the ejector rod injection molding piece 17 is kept unchanged.

Finally, although the description has been described in terms of embodiments, not every embodiment is intended to include only a single embodiment, and such description is for clarity only, as one skilled in the art will recognize that the embodiments of the disclosure may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides an initial position adjustable linear travel alarm mechanism, includes mounting base (1), ejector pin (3), and after ejector pin (3) passed mounting base (1) and stretched out, its characterized in that: the ejector rod (3) is connected with an ejector rod injection molding piece (17) at the end part position inside the mounting base (1), the ejector rod injection molding piece (17) is connected with the guide shaft (4) in a sliding mode, and the guide shaft (4) is positioned in an inner shell cavity (23) of the inner shell (2) and is connected with the inner shell (2); the injection molding device is characterized in that a spring (5) is sleeved on a guide shaft (4) between an ejector rod injection molding piece (17) and the bottom end of an inner shell cavity (23), an injection molding adjusting groove (21) is formed in the top end of the end face, which is in contact with the spring (5), of the ejector rod injection molding piece (17), the injection molding adjusting groove (21) is matched with an adjusting shaft (6), the top end of the adjusting shaft (6) penetrates through an inner shell (2) and a mounting base (1) and then stretches out, an adjusting notch (19) is formed in the position, stretching out of the adjusting shaft (6), of the mounting base (1), and the end part, stretching out of the mounting base (1), of the adjusting shaft (6) is limited to be in a self state through a pawl (8) and the mounting base (1); the bottom of the ejector rod injection molding piece (17) is provided with a circuit brush (9), and the circuit brush (9) slides along a resistance layer on the circuit board (11) and enables the circuit board (11) to externally output a continuous linear voltage signal or output a circuit on-off state; the circuit board (11) is positioned at the bottom of the inner shell cavity (23), and the inner shell (2) moves relative to the mounting base (1) under the drive of the adjusting shaft (6); the adjusting shaft (6) drives the inner shell (2) and the ejector rod injection molding piece (17) to move together relative to the mounting base (1), the relative position between the inner shell (2) and the ejector rod injection molding piece (17) is kept unchanged, the initial contact position between the circuit brush (9) and the circuit board (11) is kept unchanged, and the abrasion alarming displacement of the circuit brush (9) driven by the ejector rod (3) and the ejector rod injection molding piece (17) is kept unchanged.

2. The linear travel warning mechanism with adjustable initial position as set forth in claim 1, wherein: the adjusting shaft (6) is provided with an adjusting bottom end (27), the adjusting bottom end (27) is a shaft body with a plane, and when the adjusting bottom end (27) rotates to be parallel to the side surface of the injection molding adjusting groove (21), the adjusting bottom end (27) is positioned in the injection molding adjusting groove (21) and separated from the injection molding adjusting groove (21); when the adjusting bottom end (27) rotates to the plane to be perpendicular to the side face of the injection molding adjusting groove (21), the adjusting bottom end (27) is contacted with the ejector rod injection molding piece (17) at the opening position of the injection molding adjusting groove (21) through the plane.

3. The linear travel warning mechanism with adjustable initial position as set forth in claim 2, wherein: the adjusting shaft (6) is provided with an adjusting top end (28), and the adjusting top end (28) extends out of a shaft body penetrating hole (26) and an adjusting notch (19) on the inner shell (2) and then is connected with the pawl (8); the middle shaft body (30) is integrated with the adjusting top end (28) and the adjusting bottom end (27), and the middle shaft body (30) is matched with the shaft body penetrating hole (26).

4. A linear travel warning mechanism with adjustable initial position as claimed in claim 3, wherein: the adjusting notch (19) is a bar-shaped hole, the pawl (8) is provided with a tooth-shaped structure which is clamped with or separated from a pawl boss (31) on the mounting base (1), and the pawl (8) is connected with a shaft body clamping groove (29) at the position of the adjusting top end (28) through a shaft retainer ring (16).

5. A linear travel warning mechanism with adjustable initial position as claimed in claim 3, wherein: the mounting base (1) is provided with an inner shell placing hole (18) and an ejector rod extending hole (22), the inner shell (2) is positioned in the inner shell placing hole (18), the inner shell placing hole (18) is positioned at the end part of the mounting base (1) far away from the ejector rod extending hole (22), and base hanging lugs (20) integrated with the mounting base (1) are arranged at the positions of two sides of the mounting base; the ejector rod (3) penetrates through an ejector rod extending hole (22) on the mounting base (1) and then extends out, and the ejector rod extending hole (22) is communicated with the inner shell placing hole (18).

6. A linear travel warning mechanism with adjustable initial position as claimed in claim 3, wherein: an elliptical seal (15) is arranged outside the inner shell (2), and the elliptical seal (15) is positioned at the connecting position of the inner shell (2) and the inner shell placing hole (18); an ejector rod copper sleeve (10) is arranged in the ejector rod extending hole (22), an O-shaped ring B (14) is arranged between the ejector rod copper sleeve (10) and the ejector rod extending hole (22), and the O-shaped ring B (14) is in contact with an ejector rod (3) penetrating through the ejector rod copper sleeve (10); an adjusting shaft copper sleeve (7) is arranged in the shaft body penetrating hole (26), an O-shaped ring A (13) is arranged between the adjusting shaft copper sleeve (7) and the shaft body penetrating hole (26), and the O-shaped ring A (13) is in contact with an adjusting shaft (6) penetrating through the shaft body penetrating hole (26).

7. A linear travel warning mechanism with adjustable initial position as claimed in claim 3, wherein: the bottom of the inner shell cavity (23) is provided with a circuit board caulking groove (24), and a circuit board (11) is placed in the circuit board caulking groove (24); the circuit board (11) is provided with a conductive layer which is contacted with the circuit brush (9) and extends out of the inner shell (2) and the mounting base (1) through wires.

8. The adjustable home position linear travel alert mechanism of claim 7 wherein: the conducting layer is a resistance layer which adjusts the output resistance according to the sliding of the circuit brush (9), and the circuit board (11) is provided with a signal processing module which outputs voltage linearly.

9. The adjustable home position linear travel alert mechanism of claim 8 wherein: a flexible gasket (12) is arranged between the inner shell (2) and the inner shell placing hole (18), the flexible gasket (12) is positioned in the shaft body penetrating hole (26) and the adjusting shaft (6) penetrates out of the flexible gasket (12).