TWI728596B - Clearance adjuster and brake cylinder between brake and wheel - Google Patents

Abstract

The invention provides a lash adjuster and a brake cylinder for easily installing the brake member and the wheel of the regulation part that regulates the rotation caused by the vibration of the ratchet gear.

The brake and wheel gap adjuster 30 includes: a ratchet gear 32, which is installed on a sheath rod that houses the push rod for driving the brake; a pawl 34, which meshes with the ratchet gear 32 to regulate one direction of the ratchet gear 32 The rotation; and the regulation section 40, which has individual components of the ratchet pressing member 41 contacting the teeth of the ratchet gear 32 and the coil spring 42 absorbing the vibration of the ratchet pressing member 41, and regulates the rotation caused by the vibration of the ratchet gear 32.

Description

Clearance adjuster and brake cylinder between brake and wheel

The invention relates to a gap adjuster and a brake cylinder between a brake and a wheel.

The braking device implements braking by pressing the brake member against the wheel by the push rod. The output of the piston of the cylinder of the brake device is transmitted to the sheath rod, and the push rod contained in the sheath rod moves the brake member relative to the wheel. The brake device is equipped with a gap adjuster that automatically adjusts the gap between the wheel and the brake.

The lash adjuster is equipped with: an adjusting push rod, which converts the movement of the push rod into up and down movement; a ratchet gear, which is installed on the sheath rod; and a claw part, which rotates the ratchet gear in one direction corresponding to the movement of the lever push rod. When the gap between the brake and the wheel becomes more than the specified value, the adjusting push rod moves greatly, the pawl part rotates the ratchet gear, and the sheath rod and the ratchet gear rotate together, whereby the push rod screwed on the sheath rod is displaced toward the wheel side , So as to adjust the gap to within the specified value.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2013-087877 A

However, in the lash adjuster described in Patent Document 1, the leaf spring is regulated so that the ratchet gear does not rotate unexpectedly. When installing the leaf spring, you need to adjust the elasticity of the ratchet gear Push.

The present invention was completed in view of the actual situation, and its purpose is to provide a gap adjuster and brake cylinder for the brake member and the wheel of the regulation part that regulates the accidental rotation of the ratchet gear easily.

The mechanism for adjusting the gap between the brake and the wheel to solve the above problems includes: a ratchet gear, which is mounted on a sheath rod, and the sheath rod accommodates the push rod for driving the brake; and a pawl, which meshes with the aforementioned ratchet gear to regulate one of the aforementioned ratchet gears The direction of rotation and the regulation part have contact parts of individual components that contact the teeth of the aforementioned ratchet gear and elastic parts that absorb the vibration of the aforementioned contact part, and regulate the rotation caused by the vibration of the aforementioned ratchet gear.

According to the above configuration, since the elastic portion absorbs the vibration of the contact material, there is no need to adjust the installation of the contact portion, and the elastic portion can be installed by bringing the contact portion into contact with the teeth of the ratchet gear. Therefore, it is easy to install the regulation part that regulates the rotation caused by the vibration of the ratchet gear.

The gap adjustment mechanism between the brake and the wheel preferably includes a screw that fixes the contact portion and the elastic portion.

According to the above configuration, since the contact portion and the elastic portion can be fixed by the screw, it is easy to install the regulating portion.

The gap adjustment mechanism between the brake and the wheel preferably includes a rotation stop portion that regulates the rotation of the contact member.

According to the above configuration, since the rotation of the contact part is regulated by the rotation stop part, it is easy to mount the contact part.

The above-mentioned brake and wheel gap adjustment mechanism is preferably provided with a specific value compression The pressing member of the aforementioned elastic part.

According to the above configuration, since the compression of the elastic portion is set to a predetermined value by the pressing member, no adjustment is required when the elastic portion is installed, and the installation of the elastic portion is easy.

In the aforementioned mechanism for adjusting the gap between the brake and the wheel, the elastic portion is preferably a coil spring.

According to the above structure, since the elastic part is a coil spring, the load stress of the coil spring is small and the change over the years is small, so the number of replacements of the elastic part can be reduced.

The brake cylinder that solves the above problems includes: a cylinder, which outputs braking force through air; a sheath rod, which transmits the output of the cylinder; a push rod, which is mounted on the sheath rod; and the lash adjuster, which is mounted on the sheath rod .

According to the above configuration, since the elastic portion absorbs the vibration of the contact portion, there is no need to adjust the installation of the contact portion, and the elastic portion can be installed by bringing the contact portion into contact with the teeth of the ratchet gear. Therefore, it is easy to install a regulatory member that regulates the rotation of the ratchet gear caused by vibration.

According to the present invention, it is easy to install the regulation part that regulates the rotation caused by the vibration of the ratchet gear.

1: Brake cylinder

10: Frame

11: Tube

12: cover

13: cam

13A: Inclined plane

21: Cylinder

21A: bottom

22: Piston

23: Release the spring

24: sheath rod

25: Push rod (brake part)

26: Supply port

27: Work Room

30: Clearance adjuster

31: sheath rod outer tube

31A: Female thread

32: Ratchet gear

33: Adjust the push rod

33A: Roller

34: pawl

40: Regulation Department

41: Ratchet pusher

41A: Pressing part

41B: Through hole

41C: Pin hole

42: Coil spring

43: spring press

43A: Cylinder

43B: Flange

44: Bolt

45: pin

46: spring washer

50: Manual gap adjustment grip

51: Holding part

52: The first cover

53: The second cover

Fig. 1 is a cross-sectional view showing the structure of an embodiment of a brake cylinder equipped with a brake and a wheel gap adjuster.

Fig. 2 is a front view showing the structure of the gap adjuster of this embodiment.

Fig. 3 is an exploded perspective view showing the structure of the gap adjuster of the embodiment.

Fig. 4 is a perspective view showing the gap adjuster of this embodiment.

Hereinafter, with reference to FIGS. 1 to 4, an embodiment of a brake cylinder equipped with a brake and a wheel gap adjuster will be described. The brake cylinder is installed on the trolley of the vehicle and is used as a tread brake type brake device for braking by contacting the brake member with the tread surface of the wheel.

(Brake cylinder 1)

As shown in Fig. 1, the brake cylinder 1 has: a cylinder tube 21 with a bottom, a piston 22 that moves in the axial direction of the cylinder tube 21, a release spring 23 that pushes the piston 22, a sheath rod 24 connected to the piston 22, And a push rod 25 housed in the sheath rod 24. The front end of the push rod 25 is equipped with a stopper through a stopper head not shown.

The sheath rod 24 is rotatably connected with the piston 22. The push rod 25 is screwed to the sheath rod 24. Therefore, when the sheath rod 24 rotates, the piston 22 does not rotate, and the push rod 25 moves in any direction of the axial direction corresponding to the rotation direction of the sheath rod 24.

At the bottom 21A (left side in the figure) of the cylinder tube 21, a supply port 26 for supplying compressed air into the cylinder tube 21 is provided. The compressed air is supplied to the working chamber 27 surrounded by the cylinder 21 and the piston 22. When compressed air is supplied to the operating chamber 27, the piston 22 of the brake cylinder 1 moves in a direction away from the bottom 21A of the cylinder tube 21. On the other hand, when compressed air is discharged from the operating chamber 27, the piston 22 of the brake cylinder 1 moves in a direction approaching the bottom 21A of the cylinder tube 21 by the release spring 23.

(Gap adjuster 30)

The brake cylinder 1 is provided with a gap adjuster 30 that automatically adjusts the gap between a wheel (not shown) and a brake (not shown) attached to the front end of the push rod 25. The gap adjuster 30 is set at On the outer periphery of the sheath rod 24, the front end position of the push rod 25 (stopper) is adjusted by rotating the sheath rod 24.

The brake cylinder 1 includes a frame 10 that houses a lash adjuster 30. The frame body 10 includes a cylindrical cylindrical portion 11 with a bottom and a cover 12 that closes the opening of the cylindrical portion 11. The tube portion 11 covers and closes the opening of the cylinder tube 21 and accommodates the gap adjuster 30. The front end sides of the sheath rod 24 and the push rod 25 protrude from the cover 12 to the outside.

The cylindrical manual gap adjustment grip 50 is fixed to the outer periphery of the front end side of the sheath rod 24. The manual gap adjustment grip 50 is fixed to the outer periphery of the sheath rod 24 and rotates integrally with the sheath rod 24. A holding portion 51 with an L-shaped cross section is provided at the front end of the manual gap adjustment grip 50.

A first cover 52 is installed between the manual gap adjustment handle 50 and the cover 12 of the frame 10 to prevent water, garbage, etc. from entering. In addition, a second cover 53 is installed between the manual gap adjustment handle 50 and the push rod 25 to prevent water, garbage, etc. from entering. The cylindrical members of the first cover 52 and the second cover 53 are formed into a bellows shape in cross section. The front end of the first cover 52 is closely connected to the cover 12 of the frame 10. The front end of the first cover 52 can move relative to the manual gap adjustment handle 50. The front end of the second cover 53 is in close contact with the manual gap adjustment handle 50. The front end of the second cover 53 is relatively movable with respect to the push rod 25. The holding portion 51 of the manual gap adjustment handle 50 is exposed when the first cover 52 and the second cover 53 are installed. Therefore, since it is not necessary to remove the cover in order to operate the manual gap adjustment grip 50, the manual gap adjustment grip 50 can be operated with the first cover 52 and the second cover 53 attached.

The lash adjuster 30 includes a sheath rod outer tube 31 that is attached to the outer circumference of the sheath rod 24 and rotates relative to the sheath rod 24. The sheath rod outer tube 31 does not rotate and is fixed in its position. The lash adjuster 30 has a ratchet gear 32 installed on the outer circumference of the sheath rod 24 and fixed to the sheath rod 24. The ratchet gear 32 rotates integrally with the sheath rod 24.

The gap adjuster 30 has: an adjusting push rod 33 that detects the gap between the wheel and the brake; and a cam 13 that converts the axial movement of the sheath rod 24 into the adjusting push rod 33 Slope 13A that moves down. The base end of the adjusting push rod 33 is provided with a roller 33A that rolls on the inclined surface 13A of the cam 13. The cam 13 is arranged on the inner wall of the cylindrical portion 11 of the frame body 10. The cam 13 can correspond to the desired gap between the wheel and the brake, and can be changed in the axial direction of the sheath rod 24 by a bolt provided on the cover 12. When the push rod 25 advances, the roller 33A rises on the inclined surface 13A of the cam 13, so that the roller 33A rises, and the adjustment push rod 33 moves upward. That is, the lift amount of the roller 33A and the movement amount of the adjustment push rod 33 coincide.

As shown in FIG. 2, the gap adjuster 30 includes a pawl 34 as a pawl portion, and the pawl 34 rotates in accordance with the up and down movement of the adjustment push rod 33. The pawl 34 passes over one tooth of the ratchet gear 32 and meshes with the next tooth top when the gap between the wheel and the brake is greater than a predetermined value. If the brake is released, the adjusting push rod 33 moves downward, and the pawl 34 rotates the ratchet gear 32 by one tooth.

(Regulation Department 40)

As shown in FIGS. 2 to 4, the lash adjuster 30 includes a regulation unit 40 that regulates the rotation caused by the vibration of the ratchet gear 32. The regulation part 40 is provided on the upper surface of the sheath rod outer tube 31. The regulation part 40 includes individual components: a ratchet pressing member 41 as a contact part to contact the teeth of the ratchet gear 32 and a coil spring 42 as an elastic part that absorbs vibration of the ratchet pressing member 41. The ratchet pressing member 41 has a cylindrical pressing portion 41A that is in contact with the teeth of the ratchet gear 32. The ratchet pressing member 41 is urged by the coil spring 42.

The regulation portion 40 includes a spring presser 43 as a pressing member, and the spring presser 43 compresses the coil spring 42 by a specific value. The spring presser 43 includes a cylindrical portion 43A that is inserted into the inner side of the coil spring 42 and a flange portion 43B that is in contact with the upper end of the coil spring 42. The coil spring 42 is compressed by the flange portion 43B of the spring pressing member 43, and the compression of the coil spring 42 is based on the cylindrical portion The length of 43A is specified as a specific value.

The regulating portion 40 includes a bolt 44 as a screw that fixes the ratchet pressing member 41 and the coil spring 42 to the sheath rod outer cylinder 31. The ratchet presser 41 has a through hole 41B through which the coil spring 42 is not inserted but the spring presser 43 is inserted through. The spring pressing member 43 penetrates the ratchet pressing member 41. The bolt 44 penetrates through the spring pressing member 43 of the coil spring 42 and the through hole 41B of the ratchet pressing member 41 and is screwed to the female thread 31A of the sheath rod outer cylinder 31. The spring washer 46 is sandwiched between the screw head of the bolt 44 and the flange portion 43B of the spring pressing member 43. The spring washer 46 is sandwiched between the ratchet pressing member 41 and the sheath rod outer tube 31. The bolt 44 is restrained from loosening by the spring washers 46.

The regulating part 40 has a pin 45 as a rotation stop part, which regulates the rotation of the ratchet pressing member 41. The pin 45 is fixed on the upper surface of the sheath rod outer cylinder 31 and penetrates the pin hole 41C provided on the ratchet pressing member 41. The rotation of the ratchet pressing member 41 is regulated by the bolt 44 and the pin 45.

Next, the operation of the above-mentioned gap adjuster 30 will be described.

As shown in FIG. 1, if compressed air is supplied from the supply port 26 of the cylinder tube 21 to the actuating chamber 27, the piston 22 resists the force of the release spring 23 and moves to the side away from the bottom 21A of the cylinder tube 21, which is shown in FIG. Move to the right. Then, when the piston 22 moves to the right in FIG. 1, the push rod 25 is integrated with the piston 22 via the sheath rod 24 connected to the piston 22 to advance to the right in FIG. 1.

If the sheath rod 24 moves to the right in FIG. 1, the gap adjuster 30 moves to the right in FIG. 1, and the roller 33A of the adjusting push rod 33 rises on the inclined surface 13A of the cam 13, thereby the adjusting push rod 33 moves upward. If the adjusting push rod 33 moves upward, the pawl 34 rotates in the counterclockwise direction in FIG. 2.

As shown in Figure 2, when the gap between the wheel and the brake is less than the specified value and the advance of the push rod 25 is less than the specified value, the pawl 34 uses the lifting amount of the roller 33A (adjusting the movement of the push rod 33) to move the ratchet The gear 32 does not pass over one tooth, and the ratchet gear 32 does not rotate.

On the other hand, when the gap between the wheel and the brake is greater than the predetermined value and the advancement of the push rod 25 is greater than the predetermined value, the pawl 34 uses the lifting amount of the roller 33A (adjusting the amount of movement of the push rod 33) to pass the ratchet gear 32 one tooth, and mesh with the next tooth top. Furthermore, if the brake is released by discharging compressed air from the operating chamber 27 from this state, as the push rod 25 moves in the direction opposite to the entry direction, the adjusting push rod 33 descends on the inclined surface 13A of the cam 13, thereby The pawl 34 rotates the ratchet gear 32 by one tooth. As the ratchet gear 32 rotates, the sheath rod 24 fixed integrally with the ratchet gear 32 also rotates, and the push rod 25 screwed with the sheath rod 24 moves in the forward direction and the position is adjusted.

The regulating portion 40 of the lash adjuster 30 is always in contact with the teeth of the ratchet gear 32 to regulate the rotation caused by the vibration of the ratchet gear 32. The ratchet pressing member 41 of the regulation part 40 is elastically pushed by the coil spring 42. The coil spring 42 is compressed to a specific value by the spring pressing member 43, so there is no need to adjust the leaf spring as before, and the rotation of the ratchet gear 32 can be regulated by a specific elastic thrust only by assembling the components of the regulating portion 40. In addition, the pressing portion 41A of the ratchet pressing member 41 is in contact with the teeth of the ratchet gear 32, and the coil spring 42 absorbs the vibration of the ratchet pressing member 41. Therefore, by setting the contact function of the ratchet gear 32 and the function of vibration absorption as different components, separate assembly adjustments are not required.

Next, the effect of this embodiment will be explained.

(1) Since the coil spring 42 absorbs the vibration of the ratchet pressing member 41, there is no need to adjust when the ratchet pressing member 41 is installed, as long as the ratchet pressing member 41 is in contact with the teeth of the ratchet gear 32 and the coil spring 42 is installed. Therefore, it is easy to install the regulation part 40 that regulates the rotation of the ratchet gear 32 caused by vibration.

(2) Since the ratchet pressing member 41 and the coil spring 42 can be fixed by the bolt 44, the regulating part 40 can be easily installed.

(3) Since the rotation of the ratchet pressing member 41 is regulated by the pin 45, it is easy to install the ratchet pressing member 41.

(4) Since the compression of the coil spring 42 is set to a specific value by the pressing member, no adjustment is required when the coil spring 42 is installed, and the coil spring 42 can be easily installed.

(5) Since the load stress of the coil spring 42 is small and the change over the years is small, the number of replacements of the coil spring 42 can be reduced.

(Other embodiments)

The above-mentioned embodiment can be modified and implemented as follows. The above-mentioned embodiment and the following modified examples can be combined with each other within the scope of technically not contradictory, and can be implemented.

‧In the above embodiment, the spring washer 46 is used for the regulation part 40, but a flat washer can also be used.

‧In the above embodiment, the spring washer 46 is sandwiched between the screw head of the bolt 44 and the flange portion 43B of the spring pressing member 43, but the screw head of the bolt 44 and the flange portion 43B of the spring pressing member 43 can also be omitted Between the spring washer 46.

‧In the above embodiment, the spring washer 46 is sandwiched between the ratchet pressing member 41 and the sheath rod outer tube 31, but the spring washer 46 between the ratchet pressing member 41 and the sheath rod outer tube 31 can also be omitted.

‧In the above embodiment, the coil spring 42 is used as the elastic part that absorbs the vibration of the ratchet pressing member 41. However, it is not limited to a coil spring, and an elastic part containing an elastic material such as rubber may also be used. For example, instead of the coil spring 42 and the spring pressing member 43, a cylindrical elastic part containing an elastic material may be screwed to the sheath rod outer tube 31 to absorb the vibration of the ratchet pressing member 41.

‧In the above embodiment, there is a spring that compresses the elastic part by a specific value The member 43, but the spring pressing member 43 can also be omitted.

‧In the above embodiment, the pin 45 that regulates the rotation of the ratchet pressing member 41 is provided, but the pin 45 as a rotation stop part can be omitted.

‧In the above embodiment, a bolt 44 is provided for fixing the ratchet pressing member 41 and the coil spring 42 to the sheath rod outer tube 31. However, the screw may not be used, and the ratchet pressing member 41 and the coil spring 42 may be fixed to the pressing member of the sheath rod outer cylinder 31 by pressing.

‧In the above embodiment, it is set as the lash adjuster 30 for the brake cylinder of the tread brake model, but it can also be used as the lash adjuster for the brake device of the disc brake model.

30: Clearance adjuster

31: sheath rod outer tube

32: Ratchet gear

33: Adjust the push rod

33A: Roller

34: pawl

40: Regulation Department

41: Ratchet pusher

42: Coil spring

43: spring press

44: Bolt

46: spring washer

Claims (8)

A brake and wheel gap adjuster, comprising: a ratchet gear mounted on a sheath rod, the sheath rod accommodating a push rod for driving the brake; a pawl part meshed with the ratchet gear to regulate one direction of the ratchet gear The rotation; and the regulation part, which has the contact part of the individual components and the tooth contact of the aforementioned ratchet gear and the elastic part that absorbs the vibration of the aforementioned contact part, and regulates the rotation caused by the vibration of the aforementioned ratchet gear. For example, the brake and wheel gap adjuster of claim 1, which is provided with a screw that fixes the contact portion and the elastic portion. For example, the brake and wheel gap adjuster of claim 1, which is provided with: a rotation stop part that regulates the rotation of the aforementioned contact part. For example, the brake and wheel gap adjuster of claim 2 is provided with: a rotation stop part that regulates the rotation of the aforementioned contact part. For example, the brake and wheel gap adjuster of any one of claims 1 to 4, which is provided with a pressing member that compresses the aforementioned elastic part by a specific value. Such as the brake and wheel gap adjuster of any one of claims 1 to 4, wherein The aforementioned elastic part is a coil spring. Such as claim 5 of the brake and wheel gap adjuster, wherein the aforementioned elastic part is a coil spring. A brake cylinder is provided with: an air cylinder, which outputs braking force by air; a sheath rod, which transmits the output of the cylinder; a push rod, which is mounted on the sheath rod; and claims 1 to 7 which are mounted on the sheath rod Any one of the brake and wheel gap adjusters.

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