JP3685016B2 - Brake drive link mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a floor member in a relatively low position while preventing an interference thereof with an object located above and below an actuator. SOLUTION: A link mechanism for brake device drive is in-stalled in a vehicle, which has a downwardly displaced axle body 25 interconnecting wheels and transmits driving force to the wheels w via reduction gears 31 disposed at both ends of the axle, in order to produce braking force by transmitting operating force of a spring chamber 67 to brake shoes 15. The spring chamber 67 and the brake shoes are connected by a pushrod train R1, R2. An interposed motion direction converting crank part 68 has a first lever member 761 connected to the spring chamber 67 and the first pushrod R1, and a second lever member 762 integrated with the first lever member and connected to the second pushrod R2 arranged on the brake shoes 15. A connection 80 between the first pushrod R1 and the lever member 761, and a connection 73 between the second pushrod R2 and the lever member 762 are located in the clearance between both lever members 761 and 762.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake mechanism driving link mechanism, in particular, by transmitting a pressing force of a push rod extending from an air chamber to a brake shoe housed in a brake drum to mechanically separate the brake shoe. The present invention relates to a drive link mechanism used in a brake device in which wheels are braked during parking.
[0002]
[Prior art]
The vehicle includes a brake device for applying a braking force to the wheels, and includes a service brake used during traveling and a parking brake used during parking. Especially for trucks and buses where the weight of the vehicle body is relatively large, drum-type brake devices that easily reinforce the braking force are often used as service brakes, and as a parking brake, a center brake that applies braking force to the center drum on the side of the peller shaft Moreover, a wedge parking brake using an actuator-driven wedge that has a large braking force and is easy to ensure safety is frequently used. Note that the actuator used in the wedge parking brake is attached at a relatively high position in order to prevent the actuator from being damaged by a stepping stone from the road surface.
[0003]
By the way, in recent years, there is a route bus that has a lower entrance and lowers the floor in the passenger compartment following the entrance and exit to improve the boarding and lowering so-called floor reduction. The axles of such route buses, especially the rear axles, tend to be installed at low positions to cope with low flooring, and the ground clearance of the axle and the distance between the side of the body between the axle and the flooring material are both small. Tend to be. As described above, when the ground clearance of the axle and the space on the body side are both reduced, the arrangement position of the wedge-type parking brake device that has been conventionally mounted at a relatively high position on the axle side is restricted, and particularly used for the brake device. If a relatively large mounting space is used, such as a driving link mechanism or a spring chamber, the restriction is greatly imposed. For example, a driving link mechanism and a spring chamber used in the brake device disclosed in Japanese Utility Model Publication No. 7-19939 are arranged in an empty space in front of the axle in a state of being directed in the front-rear direction of the vehicle. This is connected to a wedge cylinder protruding in the vehicle width direction via a movement direction conversion crank.
[0004]
[Problems to be solved by the invention]
However, the push rod and the spring chamber, which are the brake device driving link mechanism disclosed in Japanese Utility Model Publication No. 7-19939, are connected to one rotating end of the bell crank-shaped motion direction changing crank through the space above the axle. Yes. As described above, the brake mechanism drive link mechanism and the spring chamber connected to the brake device protrude relatively large above the axle, and the position of the floor member of the vehicle becomes relatively high, so that the floor of the vehicle can be lowered. Cannot be adopted. Moreover, since the spring chamber here is provided on the front side of the axle, the axle cannot be used as a stepping stone prevention wall, and there is a problem that it is easily damaged in this respect.
[0005]
Based on the above-mentioned problems, the present invention reduces the amount of the spring-type booster and the brake device drive link mechanism connected to it projecting up and down from the housing portion of the axle that supports them, It is an object of the present invention to provide a brake device driving link mechanism that can prevent interference with protrusions, stepping stones, and the like from the road surface.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention of claim 1 displaces the middle portion of the axle connecting the left and right wheels downward, and passes the gearbox through the reduction gears disposed at both ends of the axle. Brake force by transmitting the operating force of the spring-type booster to the brake shoe (wheel cylinder) that is mounted on a vehicle having an axle that transmits driving force to the wheel and housed in the brake drum of the wheel. In the brake device driving link mechanism for generating the brake device, the spring-type booster device and the brake shoe are coupled by a push rod row and connected to the spring-type booster device in the middle of the push rod row. A first lever member connected to the first push rod, and a gap between the first lever member and the first lever member. A movement direction conversion crank portion having a second lever member connected to the second push rod is connected, the connecting portion between the first push rod and the first lever member, and the second push The connecting portion between the rod and the second lever member is disposed in the gap between the first lever member and the second lever member.
[0007]
Here, the movement direction conversion crank portion is provided with first and second lever members that are integrated with each other through a gap, and a second push rod connected to the brake shoe portion side is provided on the upper side. Connected to the second lever member, the first push rod on the spring-type booster side is connected to the lower first lever member, and the connecting portion between the second push rod and the second lever member And the connecting portion between the first push rod and the first lever member are disposed in the gap between the upper and lower lever members. For this reason, the amount of vertical protrusion of both connecting portions and both lever members can be kept low, and the amount of vertical protrusion of the first push rod and the spring-type booster connected to the connecting portion is also reduced. It is possible to prevent the interference between these and the flooring, and the interference with the projections and stepping stones from the road surface, and the durability can be ensured. In addition, since the present invention is applied to a low-floor vehicle in which the middle portion of the axle is displaced downward using a reduction gear, the present invention can be effectively used in this respect.
[0008]
According to a second aspect of the present invention, there is provided the brake device driving link mechanism according to the first aspect, wherein the spring-type booster and the first push rod connected to the same are the rearward wall of the housing at the intermediate portion of the axle. On the other hand, the center line in the rear view is attached so as to substantially coincide with the intermediate housing.
In this case, both the body-side distance and the ground clearance between the spring-type booster and the floor material of the first push rod connected to the same can be kept relatively large. Damage due to interference with flooring or road surface protrusions or stepping stones can be reduced, and damage due to stepping stones is further reduced by the fact that a push rod or spring-type booster is provided behind the intermediate housing. And durability can be secured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a rear axle 10 of a low floor bus, and a parking brake 1 (see FIG. 4) to which a brake device driving link mechanism as one embodiment of the present invention is applied is attached to the rear axle. Here, a brake drum 12 is provided at the left and right ends of the rear axle 10, and a wheel cylinder 9 disposed therein is used for generating a braking force that is also used by the parking brake 1 and the service brake 2 (see FIG. 4). Functions as an actuator.
As shown in FIG. 4, the service brake 2 is an air-over hydraulic brake, and receives high-pressure air from an air tank 3 as an air source from a high-pressure air pipe 4 in accordance with the depression amount of a brake pedal 5 constituting a service brake operation system. The brake valve 6 that sends out the regulated air, and the hydraulic booster that receives the pressure regulated by the brake valve 6 through the regulated air pipe 7 and outputs the boosted hydraulic pressure according to the air pressure (hydraulic (Air Servo) 8 and a wheel cylinder 9 ′ for the front left and right wheels (not shown) and a wheel cylinder 9 for the rear left and right wheels w that are supplied with the output hydraulic pressure of the hydraulic booster 8 via the hydraulic pipe system 11.
[0010]
As shown in FIG. 4, the parking brake 1 is provided in the middle of the parking switch 16 constituting the parking brake operation system, the spring chamber 19 to which the high-pressure air of the air tank 3 is supplied via the air pipe 22, and the air pipe 22. When the parking switch 16 is turned on, high-pressure air in the spring chamber 19 is removed, and when the parking switch 16 is off, the switching valve 13 that supplies high-pressure air to the spring chamber 19 and the operating force of the spring chamber 1 are applied to the wheel cylinder 9 on the left and right rear wheels w side. It is comprised with the brake device drive link mechanism 21 which transmits.
Here, the rear axle 10 and the air suspension mechanism 33 for attaching the rear axle to the side frame 39 will be described in advance.
[0011]
As shown in FIG. 1, the rear axle 10 is an axle housing, which is a gear box that houses an axle main body 25 that is long in the vehicle width direction Y and has a bulging portion b, and a reduction gear 31 (see FIG. 3) at its left and right ends. 26 and an end axle 27 projecting outward from the upper portion thereof in the vehicle width direction Y. Moreover, in these axle housings, there are a differential 28 constituting a rotation transmission system, an axle shaft 29 shown in FIG. 3 (only the left side is shown), a reduction gear 31 thereof (only the left side is shown in FIG. 3), and an end. A part drive shaft 40 (only the left is shown in FIG. 3) and the like are provided. The differential 28 is mounted rearward, and a rotational force is transmitted from a rear engine (not shown).
[0012]
As shown in FIG. 3, the speed reducer 31 decelerates the rotational force received from the relatively low axle shaft 29 side by the vertical reduction gears 311 and 312 and transmits it to the end drive shaft 40 at the upper position. The reduction gear 31 can suppress the ground height H1 of the axle body 25 to be low, and can also reduce the shape of the bulging portion b of the differential 28, thereby enabling the floor 17 that is a floor material of the low floor bus to be lowered. Yes. Further, the differential 28 is provided to be deviated from the center to the right side in FIG. 1, thereby facilitating formation of the floor 17 of the passenger passage R having a predetermined width on the left side of the vehicle body at a low position.
[0013]
Such a rear axle 10 is connected and supported by a pair of left and right side frames 39 via an air suspension mechanism 33 having an air spring 32. As shown in FIG. 6, the air suspension mechanism 33 is integrally coupled in the vicinity of the left and right ends of the axle body 25 and is extended to the front and rear ends of the left and right suspension arms 34 through a gear box 26 and long in the front-rear direction X. An air spring 32 whose lower end is integrally coupled to the formed spring receiver 341, a shock absorber 35 whose lower end is coupled to each spring receiver 341, and a central front wall of the axle body 25 are connected via a spherical joint 36 to a plane. The V-shaped lower radius rod 37 and the upper radius rod 38 that are pin-coupled to the upper end side of each gear box 26 and extend forward are formed. The upper ends of the air springs 32 are bolted to the lower walls of the front left and right spring receivers 41 and the rear left and right spring receivers 42 that are fixed to the left and right side frames 39 and extend in the vehicle width direction Y. The respective distal ends of the left and right upper radius rods 38 and the left and right distal ends of the lower radius rod 37 are respectively pin-coupled to a vehicle body side base portion (not shown). Moreover, the vertical vibration is buffered by the left and right air springs 32.
[0014]
As shown in FIG. 3, each gear box 26 projects a cylindrical end axle 27 from the side wall of the gear box 26, and an end drive shaft (only one shown in FIG. 3) 40 is inserted into the same. An annular flange portion 271 protrudes from the outer periphery of the end axle 27 closer to the inside of the vehicle, and a brake support frame 46 (see FIG. 4) to which a rear brake assembly is attached is concentrically overlapped and fixed. Has been. The dust cover 14 is concentrically stacked on the annular end portion of the brake support frame 46 on the vehicle inner side, and is bolted. A wheel hub 401 and a brake drum 12, which are integrally coupled to the left end drive shaft 40, are pivotally attached to the outer periphery of the end axle 27.
In addition, the part shown with the broken line in the brake drum 12 of the left side in FIG. 3 was shown especially as a schematic end surface in the AA line direction shown by the arrow in FIG.
[0015]
As shown in FIGS. 3 and 4, the brake support frame 46 is inclined by a predetermined amount with respect to the central base portion 463 that overlaps the flange portion 271 (see FIG. 3) of the end axle 27 and the vertical line L <b> 0 (see FIG. 4). Upper and lower bent end portions 461 and 462 extending in the direction of the line L1 inclined by the angle α are formed. The upper bent end portion 461 of the oblique upper portion is formed in a bracket shape that can be pin-coupled to the end portion of the brake shoe 15 as shown by a broken line in FIG. As shown by a broken line in FIG. 3, the lower bent end portion 462 of the oblique lower portion is formed to be bent outward in the vehicle width direction Y by a predetermined angle with respect to the center base portion 463, and the wheel cylinder 9 is attached thereto. The other ends of the pair of brake shoes 15 are attracted and urged to each other by a tension spring 50 and are pressed against the wheel cylinder 9 so as to sandwich it. Note that the lower bent end 462 protrudes to the lower side and the wheel cylinder 9 is provided there, so that the region a (see FIG. 4) where the meshing positions of the upper and lower gears 311 and 312 of the speed reducer 31 can be avoided. A second push rod row R2 to be described later connected to the wheel cylinder 9 can be disposed.
[0016]
As shown in FIG. 5, the wheel cylinder 9 supported by the lower bent end 462 receives a braking hydraulic pressure from the service brake 2 side to the pressure chamber r in the cylindrical main body 49, so that a pair of The pistons p1 and p2 are brought into contact with and separated from each other, and the function of applying a braking force to the brake drum 12 by displacing the brake shoe 15 interlocking with the piston p1 and p2 is attached to the cylinder body 49 in a direction orthogonal to the longitudinal direction. The brake shoe 15 interlocked with the pair of pistons p1 and p2 has a function of applying a braking force to the brake drum 12 when the wedge 63 receives the pressing force F1 ′ from the brake device driving link mechanism 21 side.
In the wheel cylinder 9, the cylindrical main body 49 is fastened and coupled to the bent end 462 of the brake support frame 46 by a bolt (not shown), and an annular connecting portion 511 is extended from the side wall of the cylindrical main body 49, which is the bent end 462. It protrudes from the through-hole b formed in. The leading end of the wedge 63 is loosely fitted into the opening i formed by the annular coupling portion 511, and the leading end is fitted into the gap e between the pair of pistons p 1 and p 2 in the cylindrical main body 49.
[0017]
An annular groove is formed in the inner peripheral wall of the annular connecting portion 511, and the spring receiver 84 is fitted to the same portion with a stop pin 85 without deviation. The spring receiver 84 has a central hole in which the wedge 63 is loosely fitted, and is formed so as to lock one end of a return spring 86 described later. A wedge cylinder 56 is integrally attached between the annular connecting portion 511 and the gear box 26. The wedge cylinder 56 is fitted with a wedge piston 71 that slides in the longitudinal direction S 1 of the wedge cylinder 56, and a return spring 86 is provided between one end of the wedge piston 71 and the spring receiver 84. In addition, a wedge 63 is provided between one end of the wedge piston 71 and the wheel cylinder 9, and these are covered with airtightness from the outside. The wedge piston 71 has a recess 711 formed on the side surface on the vehicle inner side, and the end of the connecting rod 72 penetrating the gear box 26 is fitted into the recess 711.
[0018]
As shown in FIGS. 1 to 3, the brake device driving link mechanism 21 includes a wedge 63 and a second push rod row R <b> 2 that integrally presses the wedge 63, and a spring attached to the axle body 25. The bell crank-shaped connecting the chamber 19, the first push rod row R 1 that is integrally pressed with the piston 66 in the spring chamber 19, and the second push rod row R 2 and the first push rod row R 1. A movement direction changing crank portion 68.
[0019]
As shown in FIGS. 3 and 5, the second push rod row R <b> 2 is formed of a wedge 63, a wedge piston 71, a connecting rod 72, and a ball joint 73. The extending end portion of the connecting rod 72 is connected to the second lever member 762 of the motion direction changing crank portion 68 via a ball joint 73 as a connecting portion. In FIG. 3, the center lines on the wheel cylinder 9 side and the wedge cylinder 56 side are discontinuously displayed. As described above, this is because the wheel cylinder 9 in the left brake drum 12 in FIG. This is because this is shown as a schematic end face in the direction of the line AA indicated by the arrow in FIG.
As shown in FIG. 3, the second push rod row R <b> 2 transmits the pressing force F <b> 1 ′ to the wheel cylinder 9 from the second lever member 762 on the lower position side obliquely upward. In relation to this, since the attachment portion 51 of the wheel cylinder 9 is attached to the lower bent end portion 462 of the brake support frame 46, the tip end portion of the wedge 63 is placed in an appropriate direction in the gap e between the pair of pistons p1 and p2. It was possible to face each other.
[0020]
The spring chamber 19 is attached to the rear wall fb of the axle body 25 through the bracket 78 so that the center line in rear view coincides with the center line L3 (see FIG. 3) of the axle body 25. As shown in FIG. 2, the main body 77 includes a piston 66, a piston rod 79 extending from the piston 66, and a compression spring 81 that projects and biases the piston 66. The main body 77 forms a pressure chamber 82 (see FIG. 2) on the side without the compression spring 81, and forms an air introduction port 83 at a position facing the pressure chamber 82. An air pipe 22 having a switching valve 13 on the parking brake 1 side is connected to the air introduction port 83.
[0021]
The movement direction conversion crank portion 68 includes a bracket 75 whose base portion is fixed to the rearward wall fb of the axle body 25 and a bearing portion 751 is formed in a vertical direction, and a substantially bell crank-shaped rotation member 76 pivotally attached to the bearing portion 751. Is provided. The rotation member 76 includes a first lever member 761 whose main portion (not shown) is pivotally attached to the bearing portion 751 and bends and extends from the lower end thereof, and a second lever member 762 that bends and extends from the upper end. The extended end of the piston rod 79 is connected to the upper surface side of the first lever member 761 via a ball joint 80 as a connecting portion. The extending end of the connecting rod 72 is connected to the lower wall surface of the second lever member 762 via a ball joint 73. Both the ball joints 80 and 73 are both disposed in the upper and lower gaps of the first and second lever members 761 and 762, whereby the lever members 761 and 762 and the ball joints 80 and 73 protrude in the vertical direction. The amount can be suppressed, and it can contribute to securing the body side interval and the ground clearance.
[0022]
As shown in FIG. 2, the first and second lever members 761, 762 are formed with a crossing angle β1 of 10 ° or less as shown in FIG. 2, and the second push rod row R2 And slightly changing the pressing direction of the first push rod row R1. Further, as shown in FIG. 3, the direction of the pressing force F1 transmitted by the first push rod row R1 is a direction coinciding with the center line L3 of the axle body 25 in the rear view, and the second push rod row R2 The direction of the pressing force F1 ′ to be transmitted is a diagonally upward direction in the rear view, and the second lever member 762 is disposed at a position higher than the first lever member 761 by a predetermined amount h, and the direction of the pressing force It is configured to allow conversion.
The right spring chamber 19 ′ is directly connected to the wedge cylinder 56 ′, and a wedge (not shown) in the wedge cylinder 56 ′ expands the diameter of a pair of brake shoes (not shown) via the wheel cylinder 9, thereby increasing the braking force. Can be added to the right rear wheel w side.
[0023]
Next, the operation of the service brake 2 and the parking brake 1 mounted on the rear axle 10 of the low floor bus of FIG. 1 will be described. As shown in FIG. 4, when the service brake 2 is operated, the air regulated by the brake valve 6 according to the depression amount of the brake pedal 5 is sent to the hydraulic booster 8, and the hydraulic pressure boosted by the air pressure is supplied. Is transmitted to the wheel cylinders 9, 9 'of the front, rear, left and right wheels w through the hydraulic pipe system 11, and the wheel cylinders 9, 9' apply a braking force to each wheel.
[0024]
On the other hand, when the parking switch 16 is turned on during parking, the air pipe 22 between the air tank 3 and the spring chamber 19 is cut off, the pressure chamber 82 of the spring chamber 19 is opened to the atmosphere, and the piston rod 79 and the brake connected thereto are connected by the compression spring 81. The pressing force F 1 ′ is transmitted to the wedge 63 from the device driving link mechanism 21. In this case, the wedge 63 receives a pressing force from the wedge piston 71 sliding in the longitudinal direction S1 of the wedge cylinder 56, expands and displaces the gap e between the pair of pistons p1 and p2, and displaces the pair of brake shoes 15 in diameter. The braking force during parking can be applied to each rear wheel w. When the parking switch 16 is turned off to enter the running state from the parking state, high-pressure air is supplied from the air tank 3 to the pressure chamber 82 of the spring chamber 19, and the piston 66 is moved against the elastic force of the compression spring 81. Then, the wedge 63 is moved backward via the brake device driving link mechanism 21, the distance between the pair of pistons p1 and p2 of the wheel cylinder 9 is reduced, the interlocking brake shoe 15 is moved backward, and the braking force of the rear wheel w is increased. The rear wheel w is released so as to be able to travel.
[0025]
As described above, the brake device driving link mechanism 21 used in the parking brake 1 of FIG. 1 includes the first push rod row R1 that transmits the pressing force F1 in the direction that coincides with the center line L3 of the axle body 25 in the rear view, and the rear surface. A second push rod row R2 that transmits the pressing force F1 ′ obliquely upward in view, and a movement direction conversion crank portion 68 that performs the direction change of the transmission of the pressing force between them are provided. For this reason, the pressing force F1 generated by the spring chamber 19 can be transmitted to the wheel cylinder 9, and in particular, the amount of vertical protrusion of both lever members 761, 762 and both ball joints 80, 73 of the motion direction conversion crank portion 68 can be suppressed. Can do. In addition, the inclination of the first push rod row R1 and the spring chamber 19 with respect to the center line L3 of the axle main body 25 can be eliminated, and the main body of the spring chamber 19 is prevented from excessively protruding in the vertical direction. And the body side space | interval H2 between the floor 17 can be ensured comparatively large.
[0026]
As a result, the air pressure type spring chamber 19, the first push rod row R1 and the movement direction changing crank portion 68 tending to have a relatively large outer diameter interfere with the floor 17, or protrusions and stepping stones from the road surface. Can be reliably reduced, and the damage caused by stepping stones can be further reduced because the first push rod row R1 and the spring chamber 19 are provided behind the axle body 25. It can be secured.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, the connecting portion between the second push rod and the second lever member and the connecting portion between the first push rod and the first lever member are connected to the upper and lower levers. Since it is disposed in the gap between the members, the vertical protruding amount of both connecting portions and both lever members can be kept low, and the first push rod connected to the connecting portion and the vertical direction of the spring type booster can be reduced. The amount of protrusion can also be reduced, and interference between these and the flooring material, and interference with projections and stepping stones from the road surface can be prevented, and durability can be ensured. In addition, since the present invention is applied to a low-floor vehicle in which the middle portion of the axle is displaced downward using a reduction gear, the present invention can be effectively used in this respect.
[0028]
The invention according to claim 2 can hold both the body-side distance and the ground clearance between the spring-type booster and the floor material of the first push rod connected to the device relatively large. Damage due to the booster interfering with projections or stepping stones from the flooring or road surface can be reduced, and in addition, a push rod or spring type booster is installed behind the intermediate housing. Breakage can be further reduced and durability can be secured.
[Brief description of the drawings]
FIG. 1 is a schematic rear view of a main part of a rear axle portion of a low floor bus to which a parking brake to which a brake device driving link mechanism according to an embodiment of the present invention is applied is attached.
2 is an enlarged cutaway plan view of a rear axle portion of the low floor bus of FIG. 1; FIG.
FIG. 3 is an enlarged rear view of the rear axle portion of the low floor bus of FIG. 1;
4 is a schematic configuration diagram of a rear brake assembly supported by a brake support frame used by the low floor bus of FIG. 1, and a service brake and a parking brake connected thereto. FIG.
5 is an enlarged cutaway cross-sectional view in a coupled state of a wheel cylinder and a wedge cylinder used in the parking brake in FIG. 1. FIG.
6 is a schematic perspective view of a main part of an air suspension mechanism used by the low floor bus of FIG. 1. FIG.
[Explanation of symbols]
9 Wheel cylinder 10 Rear axle 15 Brake shoe 25 Axle body 67 Spring chamber (spring type booster)
68 Movement direction conversion crank parts 73, 80 Connecting part 76 Rotating member 761 First lever member 762 Second lever member fb Rearward wall L3 Axle body center line R1 First push rod R2 Second push rod

Claims (2)

It is mounted on a vehicle having an axle that displaces the middle part of the axle connecting the left and right wheels downwards, and transmits the driving force to the wheels via a speed reducer disposed at both ends of the axle. In a brake device driving link mechanism for generating a braking force by transmitting an operating force of a spring type booster to a brake shoe housed in a drum,
The spring-type booster and the brake shoe are connected by a push rod row and a first push rod is connected to a first push rod connected to the spring-type booster at an intermediate portion of the push rod row. And a second lever member that has a gap with the first lever member and that is integrated with the second push rod that is disposed in the upper position and is disposed on the brake shoe portion. The movement direction conversion crank part having is connected,
The connecting portion between the first push rod and the first lever member, and the connecting portion between the second push rod and the second lever member are connected to the first lever member and the second lever member. A brake device driving link mechanism, wherein the brake device driving link mechanism is disposed in a gap. In the brake device driving link mechanism according to claim 1,
The spring-type booster and the first push rod connected to the spring-type booster are attached so that the center line in the rear view is substantially coincident with the rear-facing wall of the middle housing of the axle. A brake device driving link mechanism.

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