JP3937717B2 - Brake device with rotary pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake device including a rotary pump that sucks and discharges fluid, and is particularly suitable for application to a brake device using an internal gear pump such as a trochoid pump.
[0002]
[Prior art]
An internal gear type rotary pump such as a trochoid pump is composed of an inner rotor having outer teeth on the outer periphery, an outer rotor having inner teeth on the inner periphery, a casing for housing these outer rotors and inner rotors, and the like. It is configured. The inner rotor and the outer rotor are arranged in the casing in a state where the inner teeth and the outer teeth are engaged with each other and a plurality of gaps are formed by these teeth.
[0003]
If the line passing through the central axes of the inner rotor and the outer rotor is the center line of the pump, the casing is provided with suction ports and discharge ports communicating with the plurality of gaps on both sides of the center line. . When the pump is driven, the central axis of the inner rotor is used as a drive shaft, and the inner rotor rotates through the drive shaft, and the outer rotor is also rotated in the same direction due to the meshing of the outer teeth and the inner teeth. At this time, the volume of each gap portion changes in size while the outer rotor and the inner rotor make one rotation, and the oil is sucked from the suction port, and the oil is discharged from the discharge port.
[0004]
[Problems to be solved by the invention]
In rotary pumps such as the above trochoid pumps, a sintered material is used as a rotor material for caring against wear of each rotor, and the sintered material is subjected to carburizing treatment or a bearing steel is used as a rotor material. Tempering and tempering.
[0005]
However, when a rotary pump is used for a brake device, the lubricity of the brake fluid is low, and a very high surface pressure is generated at the meshing part of each rotor (particularly the part where the volume of the gap is the largest). It has been found that the rotor is required to have high wear resistance, and that the carburized rotor is not sufficient.
[0006]
On the other hand, it is conceivable to configure the rotor using tool steel (for example, SKH, SKD) or the like as a material having wear resistance.
[0007]
However, tool steel is expensive and has problems that the forgeability of the material is poor. Moreover, when tool steel (for example, SKD11 etc.) in which the amount of carbides is increased to obtain wear resistance is used, there is a problem that the contained carbides cause cracks and become insufficient in strength. Further, a rotor using a commonly used sintered material also has a problem that (fatigue) strength is insufficient due to bubbles or the like.
[0008]
The present invention has been made in view of the above problems, and an object thereof is to improve the wear resistance of a contact portion with which a rotor meshes.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the first aspect of the present invention, the first and second bearings are made of bearing steel made of a high-carbon chromium steel material, and tooth portions (51a, 52a) are formed on either the inner or outer periphery. Two rotors (51, 52), and a plurality of gaps (53) are formed by meshing the tooth portions of the first and second rotors, and the first and second rotors By rotating, the brake fluid is sucked into the gap portion, and the sucked brake fluid is discharged to the outside of the gap portion. Of the first and second rotors, at least on the side where the tooth portion is formed. The peripheral surface layer portion includes a rotary pump formed by subjecting the bearing steel to a nitrocarburizing treatment or a carburizing nitrocarburizing treatment.
[0010]
Thus, of the first and second rotors made of bearing steel made of a high carbon chromium steel material , at least the peripheral surface layer portion on the side where the teeth are formed is subjected to nitrocarburizing or carburizing and nitrocarburizing. If it has been processed, it is possible to improve the wear resistance at the contact portion where the first and second rotors mesh.
[0011]
In invention of Claim 2, while being comprised with the bearing steel which consists of a high carbon chromium steel material, while having an outer rotor (51) which has an inner tooth part (51a) in an inner periphery, and an outer tooth part (52a), An inner rotor (52) that rotates about a drive shaft (54) as an axis, and a rotation that is assembled and formed to form a plurality of gaps (53) by meshing the inner and outer teeth. And a casing (50) that covers the rotating part and includes a suction port (60) for sucking brake fluid into the rotating part and a discharge port (61) for discharging brake fluid from the rotating part. sucks brake fluid from the suction port by the rotating motion, is configured to discharge the brake fluid through the discharge port, and the inner circumferential surface layer portion of the outer rotor, and a surface layer portion of the outer periphery of the inner rotor, high carbon chromium It is characterized in that it comprises a rotary pump, which is formed by subjecting the窒焼insertion processing or carbonitriding窒焼insertion process immersed in bearing steel of material.
[0012]
Thus, if the outer surface layer part of the outer rotor and the outer surface layer part of the inner rotor made of bearing steel made of a high carbon chromium steel material have been subjected to nitrocarburizing or carburizing and nitrocarburizing treatment, The wear resistance at the contact portion where the outer rotor and the inner rotor mesh can be improved.
[0013]
For example, the above-described effect can be obtained by forming a nitrogen diffusion layer in the surface layer portion that has been subjected to the nitriding and quenching treatment or the carburizing and nitriding and quenching treatment as shown in claim 3. In this nitrogen diffusion layer, for example, chromium nitride shown in claim 4 is present.
[0014]
Further, as shown in claim 5, the durability can be further improved by setting the retained austenite of the surface layer portion subjected to the nitrocarburizing treatment or the carburizing and nitriding quenching treatment to 15 to 40%. It becomes.
[0015]
In addition, as shown in claim 6, including a master cylinder, the brake fluid pressure generating means (1-3) for generating the brake fluid pressure based on the pedaling force, and the wheel cylinder, and the wheel based on the brake fluid pressure. Connected to the braking force generating means (4, 5) for generating the braking force and the brake fluid pressure generating means, connected to the main conduit (A) for transmitting the brake fluid pressure to the braking force generating means, and connected to the brake fluid pressure generating means In order to increase the braking force generated by the braking force generating means, the brake device having the auxiliary pipelines (C, D) for supplying the brake fluid to the main pipeline side sucks the brake fluid through the auxiliary pipeline. At the same time, a rotary pump can be arranged so that the brake fluid can be transmitted to the braking force generating means by discharging the sucked brake fluid to the main pipeline.
[0016]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments shown in the drawings will be described.
[0018]
In FIG. 1, the brake piping schematic of the brake device which applied the trochoid pump as a rotary pump is shown. The basic configuration of the brake device will be described below with reference to FIG. Here, an example is described in which the brake device of the present invention is applied to a front-wheel drive four-wheel vehicle having a hydraulic circuit of X piping constituted by piping systems of a right front wheel—left rear wheel and a left front wheel—right rear wheel. To do.
[0019]
As shown in FIG. 1, the brake pedal 1 is connected to a booster device 2, and the brake pedal force and the like are boosted by the booster device 2.
[0020]
The booster 2 has a bush rod or the like that transmits the boosted pedaling force to a master cylinder (hereinafter referred to as M / C) 3, and the bush rod is a master disposed in the M / C 3. M / C pressure is generated by pressing the piston. Also, a master reservoir 3a for supplying brake fluid into M / C3 or storing excess brake fluid in M / C3 is connected to M / C3. These brake pedal 1, booster 2, M / C 3 and master reservoir 3a correspond to the brake fluid pressure generating means.
[0021]
The M / C pressure is transmitted to a wheel cylinder (hereinafter referred to as W / C) 4 for the right front wheel FR and W / C 5 for the left rear wheel RL via an anti-lock brake device (hereinafter referred to as ABS). ing. These W / Cs 4 and 5 constitute braking force generating means.
[0022]
The following description will be made on the right front wheel FR and the left rear wheel RL side, but since the same applies to the left front wheel FL and the right rear wheel RR side which are the second piping system, the description thereof will be omitted.
[0023]
The brake device includes a pipe line (main pipe line) A connected to the M / C 3, and the pipe line A includes a proportional control valve (PV: proportioning valve) 22. The proportional control valve 22 divides the pipe A into two parts. That is, the pipeline A is divided into a pipeline A1 that receives the M / C pressure between M / C3 and the proportional control valve 22, and a pipeline A2 between the proportional control valve 22 and each of the W / Cs 4 and 5. .
[0024]
The proportional control valve 22 normally has an action of transmitting the reference pressure of the brake fluid to the downstream side with a predetermined damping ratio when the brake fluid flows in the forward direction. As shown in FIG. 1, when the proportional control valve 22 is reversely connected, the pipeline A2 side serves as a reference pressure.
[0025]
Further, in the pipeline A2, the pipeline A is branched into two, one of which is provided with a pressure increase control valve 30 for controlling the increase of the brake fluid pressure to the W / C 4, and the other is the W / C. A pressure increase control valve 31 for controlling the increase of the brake fluid pressure to C5 is provided.
[0026]
These pressure-increasing control valves 30 and 31 are configured as two-position valves that can control the communication / blocking state by an ABS electronic control unit (hereinafter referred to as ECU). When the two-position valve is controlled to be in communication, the M / C pressure or the brake fluid pressure generated by discharging the brake fluid from the rotary pump 10 described later can be applied to each W / C 4 and 5.
[0027]
Note that the first and second pressure-increasing control valves 30 and 31 are always controlled to communicate during normal braking when ABS control is not being executed. The pressure increase control valves 30 and 31 are provided with safety valves 30a and 31a, respectively, so that brake fluid is removed from the W / C 4 and 5 side when the brake depression is stopped and the ABS control is finished. It has become.
[0028]
In addition, the ECU for ABS is provided in the pipe line B connecting the pipe line A between the first and second pressure increase control valves 30 and 31 and the respective W / Cs 4 and 5 and the reservoir hole 20a of the reservoir 20 by the ECU for ABS. Depressurization control valves 32 and 33 that can control the communication / blocking state are respectively provided. These pressure reduction control valves 32 and 33 are always cut off in the normal brake state (when the ABS is not operating).
[0029]
A rotary pump 10 is disposed between safety valves 10a and 10b in a pipeline (auxiliary pipeline) C that connects the proportional control valve 22, the pressure increase control valves 30 and 31 of the pipeline A, and the reservoir hole 20a of the reservoir 20. It is installed. A motor 11 is connected to the rotary pump 10, and the rotary pump 10 is driven by the motor 11. A detailed description of the rotary pump 10 will be given later.
[0030]
In addition, a damper 12 is disposed on the discharge side of the rotary pump 10 in the pipe C in order to reduce the pulsation of the brake fluid discharged by the rotary pump 10. A pipeline (auxiliary pipeline) D is provided so as to connect between the reservoir 20 and the rotary pump 10 and the M / C 3. The rotary pump 10 is connected to the pipeline via the pipeline D. The brake fluid of A1 is pumped and discharged to the pipe A2 through the pipe C, so that the W / C pressure in the W / Cs 4 and 5 is made higher than the M / C pressure to increase the wheel braking force. The proportional control valve 22 maintains a differential pressure between the M / C pressure and the W / C pressure at this time.
[0031]
The pipe D is provided with a control valve 34, which is always cut off during normal braking.
[0032]
In addition, a check valve 21 is disposed between the connection part of the pipe C and the pipe D and the reservoir 20 so as not to flow backward from the pipe C to the reservoir 20 due to the hydraulic pressure transmitted from the pipe D at this time. Has been.
[0033]
The control valve 40 is a two-position valve that is normally in communication. The control valve 40 is shut off when the brake is suddenly applied to the W / Cs 4 and 5 when the M / C pressure is lower than a predetermined pressure, and maintains the differential pressure between the M / C side and the W / C side. Plays the role of brake assist to increase the braking force. The control valve 40 is also shut off during traction control, and in this case as well, the differential pressure between the M / C side and the W / C side is maintained.
[0034]
Next, FIG. 2A shows a schematic view of the rotary pump 10, and FIG. 2B shows a cross-sectional view taken along the line AA of FIG. 2A. Hereinafter, the structure of the rotary pump 10 will be described with reference to FIGS.
[0035]
In the rotor chamber 50a of the casing 50 in the rotary pump 10, the outer rotor 51 and the inner rotor 52 are assembled and stored with their respective central axes (points X and Y in the figure) being eccentric. Yes.
[0036]
The outer rotor 51 includes an inner tooth portion 51a on the inner periphery, and the inner rotor 52 includes an outer tooth portion 52a on the outer periphery. The outer rotor 51 and the inner rotor 52 are meshed with each other by forming a plurality of gaps 53 by the tooth portions 51a and 52a. In order to transmit the rotational torque of the inner rotor 52 to the outer rotor 51, the inner rotor 52 and the outer rotor 51 are configured to have a plurality of contact points.
[0037]
The outer rotor 51 and the inner rotor 52 are made of bearing steel (for example, SUJ2) that has been subjected to nitrocarburizing or carburizing and nitriding. This nitriding quenching process or carburizing nitrocarburizing process is performed by performing a heat treatment for diffusing nitrogen on the surface or a heat treatment for diffusing nitrogen and carbon on the surface, and then quenching the outer rotor 51 or the inner rotor 52. In this process, the outer rotor 51 and the inner rotor 52 are tempered.
[0038]
That is, in the present invention, a nitrocarburizing treatment or a carburizing nitrocarburizing treatment is performed on a bearing steel generally made of a high carbon chromium steel material. As an example of conditions for this nitrocarburizing or carburizing nitrocarburizing treatment, a heating temperature is 820 to 840 ° C., and a mixed gas composed of Rx gas, ammonia gas, and hydrocarbon-based gas as enriched gas is used as the atmospheric gas. The heating and holding time is 4 hours.
[0039]
Nitrogen is diffused in the surface layer portion on the inner and outer periphery of the outer rotor 51 and the surface layer portion on the inner and outer periphery of the inner rotor 52 by this nitrocarburizing treatment or carburizing and nitriding quenching treatment, thereby forming a nitrogen diffusion layer. Chromium nitride (CrN) is produced in the nitrogen diffusion layer by reaction with chromium in the bearing steel.
[0040]
For example, the outer rotor 51 and the inner rotor 52 are produced by cutting out a long tubular member to a desired thickness, and by performing a nitrocarburizing treatment or a carburizing nitrocarburizing treatment, in FIGS. As shown, nitrogen diffuses into the surface layer portion of the inner and outer circumferences of the outer rotor 51 and the surface layer portion of the inner rotor 52. For this reason, the regions P and Q of the outer rotor 51 and the regions R and S of the inner rotor 52 are constituted by a nitrogen diffusion layer. In addition, the retained austenite in the regions P to S was larger than usual, for example, about 15 to 40%.
[0041]
In this case, the nitriding quenching process or the carburizing / nitriding quenching process is performed also in the regions P and S which are the outer layer of the outer rotor 51 and the inner layer of the inner rotor 52, but at least the tooth portions 51a of each other. , 52a, that is, the inner periphery of the outer rotor 51 and the outer periphery of the inner rotor 52 may be subjected to the above processing.
[0042]
Further, as shown in FIG. 2B, the casing 50 includes a first side plate portion 71 and a second side plate portion 72 arranged so as to sandwich both rotors 51 and 52 from both sides, 1 and the second side plate portions 71 and 72. The central plate portion 73 is provided with a hole for accommodating the outer rotor 51 and the inner rotor 52, thereby forming a rotor chamber 50a. Is done.
[0043]
In addition, central holes 71a and 72a communicating with the inside of the rotor chamber 50a are formed in the central portions of the first and second side plates 71 and 72. The central holes 71a and 72a are arranged in the inner rotor 52. The provided drive shaft 54 is fitted. The outer rotor 51 and the inner rotor 52 are rotatably disposed in the hole of the central plate portion 73. In other words, the rotating part composed of the outer rotor 51 and the inner rotor 52 is rotatably incorporated in the rotor chamber 50a of the casing 50, the outer rotor 51 rotates about the point X, and the inner rotor 52 sets the point Y. It will rotate as an axis.
[0044]
Further, a suction port 60 and a discharge port 61 communicating with the rotor chamber 50a are formed on the left and right sides of the first and second side plates 71 and 72 with the drive shaft 54 interposed therebetween. The suction port 60 and the discharge port 61 are disposed at positions that communicate with the plurality of gaps 53. The brake fluid from outside is sucked into the gap 53 through the suction port 60, and the brake fluid in the gap 53 can be discharged to the outside through the discharge port 61.
[0045]
Among the plurality of gap portions 53, the closed portion 53a having the maximum volume and the closed portion 53b having the minimum volume are configured not to communicate with either the suction port 60 or the discharge port 61. The confining portion 53a holds the differential pressure between the suction pressure at the suction port 60 and the discharge pressure at the discharge port 61.
[0046]
As described above, the rotary pump 10 in which the inner circumference of the outer rotor 51 and the outer circumference of the inner rotor 52 are subjected to the nitriding quenching process or the carburizing nitrocarburizing process can exhibit the following effects.
[0047]
First, since nitrogen is diffused in the inner layer of the outer rotor 51 and the outer layer of the inner rotor 52 to form a nitrogen diffusion layer, the wear resistance of the contact portion where the outer rotor 51 and the inner rotor 52 mesh with each other is formed. Can be improved. Since the amount of retained austenite in the nitrogen diffusion layer is larger than that in the case where the nitrocarburizing treatment or the carburizing nitrocarburizing treatment is not performed, the wear resistance of the contact portion where the outer rotor 51 and the inner rotor 52 mesh with each other is improved. Further improvement can be achieved.
[0048]
When the rotary pump 10 having the above structure was subjected to a nitriding quenching process and examined for wear resistance, the results shown in FIG. 3 were obtained. This figure shows the sum of the amount of wear on the inner periphery of the outer rotor 51 and the outer periphery of the inner rotor 52 when the rotary pump 10 is driven. Here, the case where SUJ2 is used as the bearing steel has been investigated. As a reference, the figure shows the results of examining the wear resistance of a rotary pump that uses an outer rotor and inner rotor that have been simply quenched and tempered without subjecting the bearing steel to nitrogen quenching. It is. As is apparent from this figure, by subjecting at least the inner circumference of the outer rotor 51 and the outer circumference of the inner rotor 52 to nitriding and quenching, the wear resistance of the contact portion where the outer rotor 51 and the inner rotor 52 are engaged is improved. is doing.
[0049]
As a result, it is possible to prevent the adjacent gap portions 53 from communicating with each other due to the wear of the tooth portions 51a and 52a of the outer rotor 51 and the inner rotor 52, thereby preventing brake fluid leakage.
[0050]
Further, since the outer rotor 51 and the inner rotor 52 can be made of relatively inexpensive bearing steel, it is not necessary to use expensive tool steel or the like, and the cost of the rotary pump 10 can be reduced. Furthermore, as in the case of using tool steel etc., the problem of insufficient strength when carbide is the starting point of cracking or insufficient strength when using sintered materials and the problem of poor forgeability of the material can be solved. it can.
[0051]
Next, the operation of the brake device and the rotary pump 10 configured as described above will be described.
[0052]
The control valve 34 provided in the brake device is used at the time of brake assist that requires a large braking force, for example, when the braking force corresponding to the braking force cannot be obtained, when the operation amount of the brake pedal 1 is large, or at the time of traction control. For example, the communication state is appropriately set. As a result, the brake fluid in the M / C 3 can be sucked by the rotary pump 10 through the conduit D.
[0053]
On the other hand, in the rotary pump 10, the inner rotor 52 rotates according to the rotation of the drive shaft 54 by driving the motor 11, and the outer rotor 51 is also rotated by the engagement of the inner tooth portion 51a and the outer tooth portion 52a. Rotate in the direction. At this time, the volume of each gap portion 53 changes in size while the outer rotor 51 and the inner rotor 52 make one rotation, so that the brake fluid is sucked from the suction port 60 and is directed from the discharge port 61 toward the pipeline A2. Exhale brake fluid. The W / C pressure is increased by the discharged brake fluid.
[0054]
In this manner, the rotary pump 10 performs a basic pumping operation in which the brake fluid is sucked from the suction port 60 and the brake fluid is discharged from the discharge port 61 by the rotation of the rotors 51 and 52.
[0055]
In this pump operation, a high surface pressure is generated at the contact portion between the tooth portions 51 a and 52 a of the outer rotor 51 and the inner rotor 52. In particular, when the rotary pump 10 is used at the time of brake assist or traction control as in the present embodiment, the surface pressure generated in the tooth portions 51a and 52a becomes very high. For example, the outer rotor 51 and the inner rotor 52 generate a surface pressure of 2000 MPa or more, and the sliding speed at that time is about 0.2 m / s.
[0056]
Even in such a case, as described above, since at least the inner periphery of the outer rotor 51 and the outer periphery of the inner rotor 52 are subjected to nitrocarburizing or carburizing and nitriding and quenching, contact between the tooth portions 51a and 52a. Even if a high surface pressure is generated in the portion, the amount of wear of the outer rotor 51 and the inner rotor 52 can be reduced. As a result, it is possible to prevent brake leakage caused by wear of the tooth portions 51a and 52a of the outer rotor 51 and the inner rotor 52, and to perform brake assist accurately.
[0057]
(Other embodiments)
In the above embodiment, the trochoid pump has been described as an example of the inscribed gear pump. However, the present invention can also be applied to the circumscribed gear pump. In this case, at least the outer periphery of each rotor may be subjected to a nitrogen quenching process or a carburizing / nitrogen quenching process in order to suppress wear of contact portions of the tooth portions provided on the outer periphery of each other. In other words, regardless of the inscribed and circumscribed type, the above-described effects can be obtained as long as the surface layer portion of the rotor on the side where the teeth are formed has been subjected to nitrocarburizing or carburizing and nitriding.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a brake device to which a rotary pump 10 according to an embodiment of the present invention is applied.
FIG. 2 is a diagram showing a specific configuration of the rotary pump 10 in FIG.
FIG. 3 is a diagram showing the results of examining the amount of wear of the tooth portions 51a and 52a with and without nitrous quenching treatment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Rotary pump, 51 ... Outer rotor, 51a ... Internal tooth part,
52 ... Inner rotor, 52a ... External tooth part, 53 ... Cavity part,
54 ... Drive shaft, 60 ... Suction port, 61 ... Discharge port,
71, 72: first and second side plates, 73: center plate,
P to S: Areas subjected to nitrocarburizing or carburizing and nitriding.

Claims (6)

A rotary pump (10) for supplying brake fluid toward the wheel cylinder in order to increase the brake fluid pressure generated in the wheel cylinders (4, 5) over the brake fluid pressure generated in the master cylinder (3) In a brake device comprising:
It is composed of a bearing steel made of a high carbon chrome steel material, and has first and second rotors (51, 52) in which teeth (51a, 52a) are formed on either the inner or outer periphery,
A plurality of gaps (53) are formed by meshing the tooth portions of the first and second rotors,
The brake fluid is sucked into the gap portion by the rotation of the first and second rotors, and the sucked brake fluid is discharged outside the gap portion,
Of the first and second rotors, at least the peripheral surface layer portion on the side where the tooth portions are formed is formed by subjecting the bearing steel to a nitrocarburizing treatment or a carburizing nitrocarburizing treatment. pump,
A brake device comprising: A rotary pump (10) for supplying brake fluid toward the wheel cylinder in order to increase the brake fluid pressure generated in the wheel cylinders (4, 5) over the brake fluid pressure generated in the master cylinder (3) In a brake device comprising:
An outer rotor (51) having an inner tooth portion (51a) on the inner periphery, an outer tooth portion (52a) and a rotational motion around the drive shaft (54), which is made of bearing steel made of a high carbon chromium steel material. An inner rotor (52), and a rotating part configured to be assembled to form a plurality of gaps (53) by meshing the inner tooth part and the outer tooth part,
The rotating portion includes a suction port (60) for sucking the brake fluid and a discharge port (61) for discharging the brake fluid from the rotating portion, and a casing (50) covering the rotating portion,
The brake fluid is sucked from the suction port by the rotational movement of the rotating part, and the brake fluid is discharged through the discharge port,
A surface layer portion on the inner periphery of the outer rotor and a surface layer portion on the outer periphery of the inner rotor are formed by subjecting a bearing steel made of a high carbon chrome steel material to a nitrocarburizing treatment or a carburizing nitrocarburizing treatment. Rotary pump,
A brake device comprising: The brake device according to claim 1 or 2, wherein a nitrogen diffusion layer is formed in the surface layer portion. The brake device according to any one of claims 1 to 3, wherein chromium nitride is formed on the surface layer portion. The brake device according to any one of claims 1 to 4, wherein a retained austenite of the surface layer portion is 15 to 40%. Brake fluid pressure generating means (1-3) including the master cylinder and generating brake fluid pressure based on the pedaling force;
Braking force generating means (4, 5) including the wheel cylinder and generating a braking force on the wheel based on the brake fluid pressure;
A main line (A) connected to the brake fluid pressure generating means and transmitting the brake fluid pressure to the braking force generating means;
An auxiliary pipeline (C, D) connected to the brake fluid pressure generating means and supplying brake fluid to the main pipeline side in order to increase the braking force generated by the braking force generating means;
The rotary pump is arranged so as to be able to transmit the brake fluid to the braking force generating means by sucking the brake fluid through the auxiliary pipeline and discharging the sucked brake fluid to the main pipeline. The brake device according to any one of claims 1 to 5, wherein the brake device is provided.

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