Brake shoe wear alarm and brake

Abstract

The present application relates to a kind of brake shoe wear alarms, including the top rod that can be on brake shoe and the top rod spring that can drive top rod to the direction of approaching or away from brake shoe telescopic, also including the switch sleeve and PIN needle that constitute loop, top rod is equipped with the blockage that can push switch sleeve away from PIN needle to disconnect loop, brake shoe wear alarm also includes the compensation mechanism that can adjust the spacing between blockage and switch sleeve.It also provides a kind of brake, including the brake shoe wear alarm described above.The present application makes the product can compensate brake drum wear, accurately measures the wear of brake shoe and accurately alarms by compensation mechanism, eliminates the interference of brake drum wear to brake shoe thickness alarm, in addition, by the function of top rod spring, top rod assembly can extend and retract, product can be reused, and the wear between brush and circuit board is improved by the way of contact switch to disconnect circuit, improve the service life of product.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of alarm, in particular to a brake shoe wear alarm and a brake. BACKGROUND

[0002] At present, the main market is the grinding type wear alarm, and the grinding type wear alarm is particularly complex to install, and needs to be installed on the friction plate with high temperature, which puts high requirements on the high temperature resistance of the wear alarm. And the brake shoe will be frequently opened and high-frequency vibrated during use, which puts high quality requirements on the grinding type wear alarm. Moreover, the friction plate is worn out, and the wear alarm also needs to be replaced, which causes great replacement burden and consumable cost to the user. Therefore, the market appears the drum type wear alarm product without replacement, such as the working principle of the product involved in the patent "Wear indicating device for disc brake", but this kind of drum type wear alarm without replacement has alarm error due to lack of brake drum wear signal identification function, which easily leads to the user's misjudgment of the wear signal of the whole brake. Although it can repeatedly monitor the thickness of the brake shoe, it cannot identify the wear of the brake drum, and it will identify the wear of the brake drum as the wear of the brake shoe.

[0003] For example, if the brake drum is worn by 3mm, according to the design, the brake shoe is worn to 2mm away from the rivet end face to alarm, but the existing product without replacement cannot identify the wear of the brake drum, and when the alarm is given, the actual thickness of the surface of the shoe is 5mm away from the rivet end face, so there is a 3mm alarm error. With the further increase of the wear of the brake drum, the error will continue to increase. The total thickness of the brake shoe available is about 10mm, so in this case, it will lead to the user's frequent replacement of the brake shoe, causing waste or making the user misjudge that the shoe alarm has been damaged. SUMMARY

[0004] The present application aims to provide a brake shoe wear alarm and a brake, which can at least solve some defects in the prior art.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical scheme: a brake shoe wear alarm, comprising a top rod capable of being abutted on a brake shoe and a top rod spring capable of driving the top rod to stretch or retract in the direction of approaching or moving away from the brake shoe, further comprising a switch sleeve and a PIN needle constituting a loop, the top rod is provided with a block capable of pushing the switch sleeve away from the PIN needle to disconnect the loop, and the brake shoe wear alarm further comprises a compensation mechanism capable of adjusting the distance between the block and the switch sleeve.

[0006] Further, the compensation mechanism has an adjusting rod that can push the plug to slide along the top rod, the sleeve has a space for the top rod and the adjusting rod to move, and the sleeve has a step that can abut against the adjusting rod on the side close to the brake shoe.

[0007] Further, the sleeve is provided with a guide groove, the extension direction of the guide groove is the extension direction of the top rod, and the adjusting rod slides in the guide groove.

[0008] Further, the sleeve is provided with a bushing, and the top rod is arranged to slide in the bushing.

[0009] Further, a sealing ring is arranged between the top rod and the sleeve.

[0010] Further, the switch spring is arranged to push the switch sleeve to make the switch sleeve contact the PIN pin, and the direction in which the switch spring exerts the elastic force is opposite to the direction in which the top rod is close to the brake shoe.

[0011] Further, the top rod and the top rod spring both have parts that extend out of the shell.

[0012] Further, the part of the top rod that extends out of the shell is provided with a compression spring washer at the junction with the shell, and the end of the top rod that abuts against the brake shoe is provided with a snap spring and a washer.

[0013] Further, the end of the shell that is away from the brake shoe has an opening for the adjusting rod to be arranged in the sleeve, the opening is blocked by an upper cover, and an O-ring is arranged between the upper cover and the adjusting rod for sealing.

[0014] The embodiment of the application provides another technical scheme: a brake includes a brake shoe and the brake shoe wear alarm described above, and the top rod abuts against the brake shoe.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] 1. The compensation mechanism can compensate for the wear of the brake drum, accurately measure the wear of the brake shoe and accurately alarm, eliminate the interference of the wear of the brake drum on the thickness alarm of the brake shoe, the top rod assembly can be extended and retracted through the function of the top rod spring, the product can be repeatedly used, the wear alarm is replaced free of charge, the circuit is disconnected in the contact switch mode, the wear between the brush and the circuit board caused by reciprocating motion is improved, and the service life of the product is improved.

[0017] 2. The on-off switch adopts a double-node on-off structure design supported by the switch spring, and the sensitivity and recoverability of the on-off information transmission wear information are improved.

[0018] 3. The top rod and the adjusting rod are both designed to be guided, so that the product runs stably. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A perspective view of a brake shoe wear alarm provided for an embodiment of the present application;

[0020] Figure 2 A schematic view of a brake provided for an embodiment of the present application;

[0021] Figure 3 A sectional view of an initial assembly position of a brake shoe wear alarm provided for an embodiment of the present application;

[0022] Figure 4 A sectional view of a free assembly state of a brake shoe wear alarm provided for an embodiment of the present application;

[0023] Figure 5 A cooperation schematic view of a brake shoe wear alarm, a brake shoe, a brake shoe, and a brake drum provided for an embodiment of the present application (assembly state of the brake drum without wear);

[0024] Figure 6 A cooperation schematic view of a brake shoe wear alarm, a brake shoe, a brake shoe, and a brake drum provided for an embodiment of the present application (assembly state of the brake drum after wear);

[0025] In the figure, 1 is an O-shaped ring; 2 is a flat gasket; 3 is a top rod; 4 is a plug; 5 is a switch sleeve; 6 is a switch spring; 7 is a compression spring gasket; 8 is a clasp spring; 9 is a gasket; 10 is a top rod spring; 11 is a sealing ring; 12 is a bushing; 13 is a sleeve; 14 is a PIN needle; 15 is a wire; 16 is a shell; 17 is an upper cover; 18 is an adjusting rod; 21 is a dust cover; 22 is a brake bottom plate; 31 is a bolt; 32 is a wire pressing buckle; 41 is a brake shoe; 42 is a brake shoe; 43 is a brake drum; 100 is a brake shoe wear alarm. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The brake shoe wear alarm provided by the embodiment of the application comprises a push rod 3 capable of being pushed against a brake shoe 41, a push rod spring 10 capable of driving the push rod 3 to extend or retract towards or away from the brake shoe 41, a switch sleeve 5 and a PIN needle 14 constituting a loop, the push rod 3 is provided with a plug 4 capable of pushing the switch sleeve 5 away from the PIN needle 14 to disconnect the loop, and the brake shoe wear alarm 100 further comprises a compensation mechanism capable of adjusting the distance between the plug 4 and the switch sleeve 5. In the embodiment, the compensation mechanism enables the product to compensate for the wear of a brake drum 43, accurately measure the wear of the brake shoe 42 and accurately alarm, eliminate the interference of the wear of the brake drum 43 on the thickness alarm of the brake shoe 42, and further enable the push rod 3 assembly to extend and retract through the function of the push rod spring 10, so that the product can be repeatedly used, the replacement of the wear alarm is avoided, and the wear between the brush and the circuit board caused by the reciprocating motion is improved through the contact switch mode, so that the service life of the product is improved. Specifically, the push rod 3 is sleeved with the push rod spring 10, and the push rod 3 can be pushed against the brake shoe 42 under the action of the push rod spring 10. The wire 15, the PIN needle 14 and the switch sleeve 5 constitute a complete circuit. When the brake shoe 42 is worn and the brake shoe 41 is opened, the push rod 3 is elongated under the action of the push rod spring 10. When the brake shoe 42 is worn to the limit position, the plug 4 assembled on the push rod 3 pushes the switch sleeve 5 to overcome the elastic force of the switch spring 6, and moves away from the PIN needle 14, so as to disconnect the circuit and alarm.

[0028] As an optimization scheme of the embodiment of the application, please refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The alarm further comprises a sleeve 13, the compensation mechanism has an adjusting rod 18 capable of pushing the plug 4 to slide along the push rod 3, the sleeve 13 has a space for the movement of the push rod 3 and the adjusting rod 18, and the side of the sleeve 13 close to the brake shoe 41 has a step capable of abutting against the adjusting rod 18. In the embodiment, when the vehicle brake shoe 42 is worn, the new brake shoe 42 is replaced. After the brake shoe 41 is disassembled, the push rod 3 is pushed by the push rod spring 10, and the push rod 3 is in the limit position, as shown in Figure 4 At this time, the plug 4 on the push rod 3 presses the switch sleeve 5, the switch sleeve 5 abuts against the sleeve 13 and cannot continue to move, the sliding resistance between the plug 4 and the push rod 3 is smaller than the elastic force of the push rod spring 10, so that the push rod spring 10 slides, and the plug 4 slides to the left of the push rod 3. After the new brake shoe 42 is replaced and the brake shoe 41 is assembled back, the push rod 3 returns to the initial installation position under the action of the brake shoe 41, as shown in Figure 3At this time, the distance between the plug 4 and the switch sleeve 5 is greater than the alarm stroke of the opening of the brake shoe 41, and the adjusting rod 18 needs to be manually pushed. The guide groove and the limiting step are arranged between the adjusting rod 18 and the sleeve 13. The guide groove makes the sliding direction of the adjusting rod 18 stable, and the limiting step limits the rightward sliding displacement of the adjusting rod 18, so that when the adjusting rod 18 is pressed onto the step, the distance between the plug 4 and the switch sleeve 5 is the alarm stroke. The alarm stroke is limited by the sleeve 13 to the adjusting rod 18, and is irrelevant to the wear of the brake drum 43.

[0029] As an optimization scheme of the embodiment of the present application, please refer to Figure 5 and Figure 6 , wherein Figure 5 is the initial assembly state when the brake drum 43 is not worn, Figure 6 is the assembly state of the wear-free alarm device after the brake drum 43 is worn. After the brake shoe 42 is replaced, the jacking rod 3 is pushed by the brake shoe 41 to return to the initial position. The plug 4 is driven by the jacking rod 3 assembly to move to the left and push the adjusting rod 18 upwards. And the adjusting rod 18 is pushed to the initial position. After the brake clearance is set, the adjusting rod 18 is manually pushed to move to the right until it is pressed on the step of the sleeve 13. At this time, the adjusting rod 18 pushes the plug 4 to slide relative to the jacking rod 3 to the position shown by the dashed line in the figure, and at this time, the distance between the plug 4 and the switch sleeve 5 is the alarm stroke. When the brake drum 43 is worn and the new brake shoe 42 is replaced, the above process is repeated, and the distance between the plug 4 and the switch sleeve 5 remains unchanged. Only the position of the plug 4 on the jacking rod 3 changes, which ensures that the brake shoe wear alarm device 100 only monitors the thickness of the brake shoe 42, and is not affected by the wear of the brake drum 43.

[0030] As an optimization scheme of the embodiment of the present application, please refer to Figure 3 and Figure 4 , the sleeve 13 is provided with a guide groove, the extension direction of the guide groove is the extension direction of the jacking rod 3, and the adjusting rod 18 slides in the guide groove. In this embodiment, the guide groove in the sleeve 13 can guide the adjusting rod 18 and prevent it from deviating.

[0031] As an optimization scheme of the embodiment of the present application, please refer to Figure 3 and Figure 4 , the sleeve 13 is provided with a bushing 12, and the jacking rod 3 slides in the bushing 12. In this embodiment, the bushing 12 can limit the sliding of the jacking rod 3 and guide it, so that it can extend and retract more stably.

[0032] As an optimization scheme of the embodiment of the present application, please refer to Figure 3 and Figure 4A sealing ring 11 is arranged between the ejector rod 3 and the sleeve 13. In this embodiment, the sealing ring 11 can ensure that the sleeve 13 is not filled with water and dust.

[0033] As an optimization of the embodiment of the present application, please refer to Figure 3 and Figure 4 The alarm further comprises a switch spring 6 for pushing the switch sleeve 5 to make the switch sleeve 5 contact the PIN needle 14, and the direction of the force applied by the switch spring 6 is opposite to the direction of the ejector rod 3 approaching the brake shoe 41. In this embodiment, normally, the switch spring 6 pushes the switch sleeve 5 to contact the PIN needle 14 to turn on the circuit. When the brake shoe 42 is worn to the limit position, the plug 4 assembled on the ejector rod 3 pushes the switch sleeve 5 to overcome the force of the switch spring 6, and the switch sleeve 5 is separated from the PIN needle 14, thereby breaking the circuit to alarm.

[0034] As an optimization of the embodiment of the present application, please refer to Figure 3 and Figure 4 The alarm further comprises a cylindrical shell 16, and the ejector rod 3 and the ejector rod spring 10 both have a part extending out of the shell 16. In this embodiment, the shell 16 is a two-section cylindrical structure to facilitate the installation of the sleeve 13, the adjusting rod 18, the ejector rod 3, etc. inside. Preferably, the part of the ejector rod 3 extending out of the shell 16 is provided with a compression spring washer 7 at the junction with the shell 16, and the end of the ejector rod 3 abutting against the brake shoe 41 is provided with a snap spring 8 and a washer 9. The end of the shell 16 away from the brake shoe 41 has an opening for the adjusting rod 18 to be assembled in the sleeve 13, and the opening is blocked by an upper cover 17, and an O-ring 1 for sealing is arranged between the upper cover 17 and the adjusting rod 18. In this embodiment, the upper cover 17 and the shell 16 can be welded or bonded, and the O-ring 1 for sealing is arranged between the upper cover 17 and the adjusting rod 18 to ensure that the shell 16 is not filled with water and dust. A flat gasket 2 is arranged between the upper cover 17 and the shell 16.

[0035] The embodiment of the present application provides a brake, which comprises brake shoes 42 and the brake shoe wear alarm 100, and the top rod 3 is on the brake shoe 41. In the embodiment, the brake shoe wear alarm 100 is used in the brake. Through the compensation mechanism, the product can compensate the brake drum 43 wear, accurately measure the brake shoe 42 wear and accurately alarm, eliminate the interference of the brake drum 43 wear on the brake shoe 42 thickness alarm, and through the function of the top rod spring 10, the top rod 3 assembly can be extended and retracted, the product can be repeatedly used, the replacement of the wear alarm is avoided, the circuit is disconnected through the contact switch, the wear between the brush and the circuit board is improved, and the service life of the product is prolonged. Specifically, the top rod 3 is sleeved with the top rod spring 10, and the top rod 3 can be pushed against the brake shoe 42 under the action of the top rod spring 10. The wire 15, the PIN needle 14 and the switch sleeve 5 constitute a complete circuit. When the brake shoe 42 wears and the brake shoe 41 is opened, the top rod 3 is elongated under the action of the top rod spring 10. When the brake shoe 42 wears to the limit position, the plug 4 assembled on the top rod 3 pushes the switch sleeve 5 to overcome the elastic force of the switch spring 6 and is away from the PIN needle 14, so that the circuit is disconnected and alarms. The brake comprises a dust cover 21, a brake bottom plate 22, a bolt 31, a wire pressing buckle 32, a brake shoe 41, a brake shoe 42 and a brake drum 43, the brake shoe wear alarm 100 is installed on the wheel edge structure member and is used for monitoring the friction plate wear.

[0036] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A brake shoe wear alarm comprising a push rod which can be pushed against a brake shoe and a push rod spring which can drive the push rod to extend or retract toward or away from the brake shoe, characterized in that: The brake shoe wear alarm further comprises a sleeve, a switch sleeve and a PIN needle constituting a circuit, and a switch spring for pushing the switch sleeve to make the switch sleeve contact the PIN needle, the direction of the force applied by the switch spring being opposite to the direction of the top rod approaching the brake shoe, the top rod being provided with a plug for pushing the switch sleeve away from the PIN needle to disconnect the circuit, the brake shoe wear alarm further comprising a compensation mechanism for adjusting the distance between the plug and the switch sleeve, the sleeve having a space for the movement of the top rod and an adjusting rod, and the side of the sleeve close to the brake shoe having a step for abutting against the adjusting rod, the sleeve being provided with a guide groove extending in the direction of the extension of the top rod, the adjusting rod sliding in the guide groove, the compensation mechanism having the adjusting rod for pushing the plug to slide along the top rod, when the brake shoe is disassembled, the top rod being in the limit position under the pushing of the top rod spring, the plug above the top rod pressing on the switch sleeve, the switch sleeve being on the sleeve and unable to move further, the sliding resistance between the plug and the top rod being smaller than the elastic force of the top rod spring, so that the plug slides to the left of the top rod on the top rod spring, after the replacement of the new brake shoe, the top rod returning to the initial installation position under the action of the brake shoe, the distance between the plug and the switch sleeve being greater than the alarm stroke of the brake shoe opening, the adjusting rod being pushed, the guide groove stabilizing the sliding direction of the adjusting rod, the step limiting the rightward sliding displacement of the adjusting rod, and the distance between the plug and the switch sleeve being the alarm stroke when the adjusting rod presses on the step.

2. The brake shoe wear indicator of claim 1 wherein: The sleeve is provided with a bushing, and the top rod is slidingly arranged in the bushing.

3. The brake shoe wear indicator of claim 1 wherein: A sealing ring is arranged between the top rod and the sleeve.

4. The brake shoe wear indicator of claim 1 wherein: The brake shoe wear alarm further comprises a cylindrical housing, and parts of the top rod and the top rod spring extend out of the housing.

5. The brake shoe wear indicator of claim 4 wherein: A compression spring washer is arranged at the joint between the part of the top rod extending out of the housing and the housing, and a clamping spring and a washer are arranged at the end of the top rod abutting against the brake shoe.

6. The brake shoe wear indicator of claim 4 wherein: An opening for the adjusting rod to enter the sleeve is arranged at the end of the housing away from the brake shoe, the opening being blocked by an upper cover, and an O-ring is arranged between the upper cover and the adjusting rod for sealing.

7. A brake comprising a brake shoe, characterised in that: The brake shoe wear alarm further comprises a brake shoe, and the top rod abuts against the brake shoe.

Images