JPH05170064A - Disc brake device - Google Patents

Abstract

PURPOSE:To moderate heat conduction to a driving shaft and perform the design and manufacture of a disc brake device and a drive unit separately so as to improve production efficiency by providing a cylindrical spline shaft to be force-fitted to the end part of the driving shaft, leaving a hollow part inside a spline with a rotor fitted to its outside. CONSTITUTION:The tip part of a driving shaft 15 is fitted into a spline shaft 16, and a spline 17 is formed at the outer periphery of the spline shaft 16. The driving shaft end in the spline shaft 16 is formed into a hollow part 18, and a rotor 8 is provided slidably to the spline 17. The hollow spline shaft 16 with the spline 17 formed at the outer periphery is force-fitted, at its hollow part, to the tip of the driving shaft 15 protruding to a disc brake device body 2 from a drive unit body 1 so as to be rotated together with the driving shaft 15 and prevented from sliding even by torque at the braking time. The hollow part 18 at the tip of the spline shaft 15 is secured as the forcefitting margin of the driving shaft 15. The demarcation between the driving shaft 15 and the spline shaft 16 can be thus clarified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate disc brake device used as a basic brake device for railway vehicles and the like.

[0002]

2. Description of the Related Art FIG. 10 is a longitudinal sectional view of a first example of a conventional multi-disc type disc brake device, FIG. 11 is an end view of a cylinder lid of the same device, and FIG. 12 is a cross sectional view of a portion of the device where a stator is provided. FIG. 13 and FIG. 13 are cross-sectional views of a portion of the rotor of the same apparatus. In FIG. 10, 1 is a drive device main body, 2 is a disc brake device main body, 3 is a cylinder lid, and the entire device is mainly composed of the above-mentioned three parts and connected to each other.

In FIG. 10, 4 is a spline integrally formed inside the disc brake device main body 2, and 5 is a spline mounted inside the spline to prevent rotation, but in the axial direction of the device. Is a sliding stator. FIG. 12 shows the sectional shape of this portion. Figure 1
Reference numeral 0 to 13 are end plates of the disc brake device body 2.

In FIG. 10, 6 is a drive shaft projecting from the drive device body 1 into the disc brake device body 2, 7 is a spline integrally formed around the drive shaft, and 8 is a spline. Drive shaft 6 mounted on the outside
It is a rotor that rotates with and slides along the spline. FIG. 13 shows the sectional shape of this portion. A plurality of stators 5 and rotors 8 are arranged so as to overlap with each other. Further, stators are arranged at both ends.

In FIG. 10, 9 is a cylinder provided in plural numbers on the cylinder lid 3, and 10 is a piston mounted on the cylinder. One end of the piston abuts the stator 5 closest to the piston. Reference numeral 11 denotes a pressure fluid supply port provided at the center of the end surface of the cylinder lid 3, and 12 denotes a supply of the pressure fluid connected to the pressure fluid supply port and radially outwardly extending to communicate with the innermost portion of the cylinder 9. It is a passage. FIG. 11 shows the arrangement of these parts. Reference numeral 12a is a closing member for closing an outer peripheral hole formed when the supply passage 12 is formed.

Next, the operation of each part when the brake is operated will be described. When the vehicle is traveling, the drive shaft 6 rotates together with the rotor 8. When the brake is actuated, the pressure fluid is supplied from the supply port 11, the pressure fluid is supplied to the cylinder 9 through the supply passage 12, and the piston 10 incorporated in the cylinder 10 is supplied.
Stroke. The piston 10 moves the adjacent stator 5 in the axial direction, and strokes until the gap between the stator 5 and the rotor 8 disappears between the end plate 13 of the disc brake device body and the piston 10, and then a pressing force is generated to generate the pressing force. A braking force that stops the rotation of the rotor 8 is generated by the frictional force of the contact surface of the rotor 8, and the braking force acts on the drive shaft 6 on which the rotor is mounted.

FIG. 14 is a vertical cross-sectional view of a second example of a conventional multi-plate type disc brake device, FIG. 15 is a cross-sectional view of a portion of the device having a stator, and FIG. 16 is a fit between the rod-shaped guide 14 and the stator 5. It is sectional drawing which shows a match. In FIG. 14, 2 is a disc brake device main body, 13 is an end plate which is a part of the main body, and 14 is a rod-shaped guide which is a part of the main body. This example is an example in which a rod-shaped guide 14 is provided in place of the cylindrical portion of the main body in the first example of the prior art, and this guide 14 is a spline of the inner surface of the cylindrical portion in the first example. It also has a function. Reference numeral 5 is a stator, and as shown in FIG. 15, an arcuate concave portion into which a rod-shaped guide is fitted is formed around the stator. The stator 5 is prevented from rotating by the rod-shaped guide 14 and slides along the rod-shaped guide. The parts other than the above are the same as those in the first example. In this example, there is a gap between the adjacent bar-shaped guides 14, which is advantageous in that it is convenient for heat dissipation.

In FIG. 16, P is the radius of a circle that overlaps the center of the rod-shaped guide 14, that is, the pitch circle, R'is the radius of the outer circumference of the stator 5, and B is the difference in radius. Conventionally, the value of B has been a relatively small value.

FIG. 17 is a view common to the first and second examples and is a sectional view showing the structure of the stator or the rotor. A high-speed railway vehicle is required to have a lighter weight in order to increase its speed, and on the other hand, it is necessary to increase its heat capacity so as to absorb a large amount of energy when a brake is applied.
For this reason, C / C composites have come to be used as disk materials so as to satisfy this requirement. FIG. 17 shows an example thereof and shows a partial cross section of a sheet-shaped C / C composite material laminated and molded.

[0010]

[Problems to be Solved by the Invention]

(1) In the conventional technology (FIGS. 10 and 13), since the spline is integrally processed at the tip of the drive shaft, it is difficult to design the disc brake device and the drive device separately. Since the disc brake device and the drive device are not technically similar devices, different factories or companies manufacture them. For this reason, it is necessary to make a detailed meeting between the two, such as processing and assembling methods, which compels the design to be inefficient. Further, when the drive shaft is manufactured integrally with the spline, frictional heat generated during braking is directly transmitted to the drive shaft through the spline, which adversely affects the drive device side (for example, seizure of bearing).

The present invention solves the above drawbacks and enables the disc brake device and the drive device to be manufactured separately.
In addition, the heat transfer to the drive shaft is to be alleviated.

(2) First example of prior art (FIGS. 10 and 1)
In the case of having the cylindrical main body as in 2), since the heat is not sufficiently dissipated, the stator and the rotor may be overheated.

The present invention seeks to ensure sufficient heat dissipation when having a cylindrical body.

(3) Since the pressure fluid supply port is provided at the center of the end face of the cylinder lid in the conventional device (FIGS. 10 and 11), when the pressure fluid supply pipe is connected to this portion,
The total length of the device becomes extremely long, and it may be difficult to install the device on a railway vehicle or the like where the outfitting space is limited.

The present invention intends to facilitate the outfitting by providing the pressure fluid supply port on the side portion of the apparatus.

(4) In the prior art (FIGS. 10 and 11), when the rigidity of the stator is not sufficient, the pressing force of the piston acts only in the vicinity of the contact portion of the piston in the stator, which results from the braking action. The wear between the stator and the rotor is not uniform on the contact surfaces of the two, resulting in uneven wear. Further, since the load distribution is not uniform, the designed braking force may not be obtained.

The present invention seeks to make the distribution of the load applied to the stator uniform, prevent uneven wear on the contact surface, and obtain the braking force as designed.

(5) Conventionally, even when the laminated C / C composite disk (FIG. 17) is used, the outer diameter of the stator is slightly larger than the pitch circle (FIG. 16). In this case, when braking, the point of action of the force acting on the notch of the stator by the guide is close to the outer circumference of the stator, so a force acts to peel off the stack of C / C composite disks, and eventually peeling (damage) occurs. There was a chance.

The present invention is intended to prevent peeling damage of such a C / C composite disk.

[0020]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is a disc brake main body which is cylindrical and is attached to a drive unit main body, and a part of the disc brake main unit which is the drive unit main body side. An end plate, a spline formed inside the disc brake body, a plurality of stators fitted along the spline and moving along the spline while being restrained from rotating, the drive device body to the disc brake device body A plurality of rotors and disc brakes, which are fitted to the spline so as to be located between the spline and the stator, which are formed outside the portion connected to the drive shaft, and which move along the spline while rotating with the drive shaft. A cylinder lid attached to the opposite side of the drive unit of the main body of the apparatus, and the cylinder lid of the cylinder lid. In the disk brake apparatus having a piston to push disk brake apparatus a plurality of cylinders provided in the main body, and said stator and rotor by fitted to the pressure fluid in the cylinder towards the end plate,
It has the following features.

(1) A spline shaft, which is cylindrical and has a spline on which a rotor is fitted and which has a hollow portion inside, is press-fitted into the end of the drive shaft. Disc brake device.

(2) A disc brake device characterized by comprising a disc brake device body having cooling fins on its outer peripheral portion.

(3) A pressure fluid supply passage that extends radially from the center of the cylinder lid and communicates with each cylinder.
And a pressure fluid supply port which is opened at a side portion of the cylinder lid and communicates with a collection portion of the radial pressure fluid supply passages at the center of the cylinder lid.

(4) A disk having a uniform load plate which has the same shape as the stator and is made of a material having high rigidity and which is interposed between the piston and a stator closest to the piston. Brake device.

(5) Instead of the cylindrical disc brake main body having the spline on the inner side thereof, a main body having a plurality of rod-shaped guides on the outer peripheral portion is provided, and the stator is fitted in the rod-shaped guides to restrain the rotation. However, in the disc brake device adapted to move along the rod-shaped guide, the outer radius of the stator is made sufficiently larger than the radius of the pitch circle of the rod-shaped guide.

[0026]

[Action]

(1) Since the spline shaft is press-fitted into the drive shaft, it rotates together with the drive shaft. Therefore, when a braking force is applied to the rotor fitted outside the spline shaft, the drive shaft stops. Since the spline shaft has a cylindrical shape and is press-fitted inside the hollow shaft leaving a hollow portion, the spline shaft is useful for heat dissipation, and heat conduction from the rotor to the drive shaft is relaxed. By separating the spline shaft and the drive shaft, the disc brake device and the drive device can be designed and manufactured separately, and the production efficiency is improved.

(2) Since the heat generated between the stator and the rotor during brake operation is dissipated by the cooling fins, overheating of the stator / rotor is prevented.

(3) By providing the pressure fluid supply port on the side of the disc brake device, it becomes possible to shorten the total length of the device after connecting the pressure fluid supply pipe,
It can be installed on a vehicle with a small outfitting space. Since the pressure fluid supply passage extends radially from the center of the cylinder lid and has the same length from the center, the pressure applied to the piston is also equalized and no one-sided contact occurs.

(4) Since the uniform load plate is made of a material having high rigidity, it is not deformed by the local load of the piston. Therefore, a uniform load is applied to the entire surface of the stator, preventing uneven wear on the contact surface between the stator and rotor,
The braking force is as designed.

(5) Generally, the damage of the stator starts from the outer peripheral portion of the stator, but in the present invention, since the outer peripheral radius of the stator is made sufficiently larger than the pitch circle of the rod-shaped guide, the contact position between the rod-shaped guide and the stator. However, since it is located sufficiently inside the outer periphery of the stator, damage to the stator is prevented.

[0031]

【Example】

(1) First Embodiment: FIG. 1 is a vertical sectional view of a first embodiment of the present invention, and FIG. 2 is a horizontal sectional view of a rotor portion of the same embodiment. In the figure, 15 is a drive shaft, 16 is a spline shaft fitted into the tip of the drive shaft, 17 is a spline formed on the outer periphery of the spline shaft, and 18 is a hollow part at the end of the drive shaft in the spline shaft. , 8 are rotors slidably fitted in the splines. The parts other than the above are the same as those of the conventional technique (FIG. 10).

In this embodiment, at the tip of the drive shaft 15 protruding from the drive device main body 1 to the disc brake device main body 2, a spline shaft 16 having a hollow spline 17 on its outer periphery is press-fitted in its hollow portion. A sufficient tightening allowance is provided so that the drive shaft 15 rotates together with the drive shaft 15 and does not slip due to the torque during braking. Further, the press-fitting margin (length) of the drive shaft is set to a necessary minimum, and the hollow portion 18 at the tip of the spline shaft 15 is secured.

By configuring the drive shaft and the spline shaft by separate parts, the distinction between the drive device and the disc brake device can be made clear, and the scope of responsibility of each manufacturing factory or manufacturing company becomes clear. Also, in designing, if only the fitting dimensions of the drive shaft and the spline shaft are determined, each can be designed independently and is efficient. In addition, the hollow part of the spline shaft can be machined through to facilitate machining, and since the hollow part with a length longer than the required press-fit length can be left as it is, the friction heat during braking transmitted through the spline shaft can be reduced. It is possible to radiate heat from the hollow portion and reduce the heat transmitted to the drive shaft.

(2) Second Embodiment: FIG. 3 is a vertical sectional view of a second embodiment of the present invention. This embodiment relates to an improvement of the first example (FIG. 10) of the prior art. In the figure, 19
Is a cooling fin formed on the outer periphery of the disc brake device body. The parts other than the above are the same as those of the conventional technique (FIG. 10).

In this embodiment, when the brake is applied,
Since heat generated by friction between the stator and the rotor can be dissipated through the cooling fins on the outer circumference of the main body, overheating of the stator and the rotor can be prevented.

(3) Third Embodiment: FIG. 4 is a vertical sectional view of a third embodiment of the present invention, and FIG. 5 is an end view of a cylinder lid of the same embodiment. In the figure, 3 is a cylinder lid, 12 is a pressure fluid supply passage provided so as to communicate with the respective cylinders 9 from the center of the lid, and 12a is after the supply passage is manufactured,
A closing member for closing its open end, 20 is a cylinder lid 3
Is a pressure fluid supply port that opens to the side of the cylinder lid and the other end of which communicates with the collecting portion of the radial supply passages in the center of the cylinder lid. Other than the pressure fluid supply port 20 described above, the prior art
0, FIG. 11).

In the present embodiment, the pressure fluid supply port 20
Since it is opened to the side of the device, the total length of the device after connecting the pressure fluid supply pipe can be shortened, and it can be easily mounted on a vehicle with a small outfitting space. Further, since the pressure fluid supply passages 12 are radial from the center and have the same length, equal pressure is applied to each piston,
One-sided piston contact is prevented.

(4) Fourth Embodiment: FIG. 6 is a vertical sectional view of a fourth embodiment of the present invention. In the figure, 21 is a piston 1
It is a uniform load plate interposed between 0 and the stator 5 closest to the piston. This uniform load plate 21 is
It has the same shape as, but is made of a highly rigid material. Parts other than the above are related to the prior art (see FIG.
It is the same as 0).

In this embodiment, the piston pushes the uniform load plate 21 when the brake is actuated, but since the uniform load plate is made of a material having a high rigidity, that is, a material that does not deform, the entire uniform load plate is used as the stator. It will be pressed. Since the uniform load plate has a shape similar to that of the stator, the force from the piston is transmitted to the stator uniformly, resulting in uneven load distribution on the disk surface, which has occurred in the prior art, and the contact surface Uneven wear is prevented.

(5) Fifth Embodiment: FIG. 7 is a transverse sectional view of a stator portion of a fifth embodiment of the present invention. This embodiment relates to an improvement of the second example of the prior art (FIGS. 14, 15, and 16). In the figure, 14 is the same rod-shaped guide as in the prior art, and 22 is a stator having a larger diameter than the conventional stator (FIG. 15).

FIG. 8 is an enlarged sectional view of the sliding portion between the rod-shaped guide 14 and the stator 22. In the figure, P is the radius of the pitch circle, R is the radius of the stator outer circumference, and A is the difference between these radii, which is larger than the radius difference B in the conventional case (FIG. 16). In this embodiment, a notch circle for fitting a guide provided on the stator 22 is extended and deepened. Since the outer radius R of the stator is made larger than that of the conventional one, the point of action of the force acting on the stator from the rod-shaped guide is inside the dimension A which is sufficiently larger than the outer periphery of the stator. Therefore, delamination of the C / C composite laminated stator can be prevented.

FIG. 9 is a sectional view showing another shape of a notched circle in the sliding portion between the rod-shaped guide 14 and the stator 22. In this example, for the purpose of facilitating the working, the inner part of the notch circle of the stator is stopped up to the vicinity of the pitch circle, and the outer side is processed straight to the outer circumference of the stator. In this case as well, the point of action of force can be put inside by a dimension A that is sufficiently larger than the outer circumference of the stator, so that the effect of preventing delamination of the C / C composite laminated stator can be expected as in the example of FIG.

To show concrete examples of the effects in these shapes by numerical values, in the prior art (FIG. 16), when P = 180 mm R ′ = 181 mm B = 1 mm, the C / C composite is generated when the brake is actuated. Delamination of the laminated stator sometimes occurred and was damaged. However, in the present example (FIGS. 8 and 9), when P = 180 mm R = 188.5 mm A = 8.5 mm, delamination did not occur. Does not happen.

[0044]

【The invention's effect】

(1) In the present invention, since the spline shaft has a cylindrical shape and the rotor is fitted to the outer side of the spline shaft and the hollow portion is left inside the spline shaft, the spline shaft is press-fitted to the end of the drive shaft. Since the disc brake device and the drive device can be designed and manufactured separately, the production efficiency is improved,
Further, since there is a hollow portion inside the spline shaft, heat transfer to the drive shaft is alleviated.

(2) In the present invention, since the disc brake device main body having the cooling fins on the outer periphery thereof is provided, the heat generated between the stator and the rotor is dissipated, and the overheating of these is prevented. ..

(3) In the present invention, a pressure fluid supply passage that extends radially from the center of the cylinder lid and communicates with each cylinder, and the radial pressure fluid supply at the center of the cylinder lid that opens to the side of the cylinder lid. Since the pressure fluid supply port that communicates with the collecting portion of the passage is provided, the total length of the device after connecting the pressure fluid supply pipe or the like can be shortened, and the device can be mounted on a vehicle with a small outfitting space.

(4) In the present invention, since the uniform load plate which has the same shape as the stator and is made of a material having high rigidity and which is interposed between the piston and the stator closest to the piston is provided, It is possible to make the distribution of the load applied to the stator uniform and prevent uneven wear at the contact surface between the stator and the rotor. Further, this makes it possible to obtain the braking force as designed.

(5) In the present invention, since the outer radius of the stator is made sufficiently larger than the radius of the pitch circle of the rod-shaped guide, it is possible to prevent the stator from being damaged.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a transverse sectional view of a rotor portion of the embodiment.

FIG. 3 is a vertical sectional view of a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a third embodiment of the present invention.

FIG. 5 is an end view of the cylinder lid of the embodiment.

FIG. 6 is a vertical sectional view of a fourth embodiment of the present invention.

FIG. 7 is a transverse sectional view of a stator portion of a fifth embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a sliding portion between the rod-shaped guide and the stator of the embodiment.

FIG. 9 is an enlarged cross-sectional view showing another shape of the sliding portion between the rod-shaped guide and the stator of the embodiment.

FIG. 10 is a vertical sectional view of a first example of a conventional disc brake device.

FIG. 11 is an end view of a cylinder lid of the device.

FIG. 12 is a cross-sectional view of a stator portion of the device.

FIG. 13 is a cross-sectional view of a rotor portion of the same device.

FIG. 14 is a vertical sectional view of a second example of a conventional disc brake device.

FIG. 15 is a cross-sectional view of a stator portion of the same device.

FIG. 16 is a cross-sectional view showing a fit between a rod-shaped guide and a stator of the same device.

FIG. 17 is a sectional view for explaining the structure of a stator and a rotor common to each of the above examples.

[Explanation of symbols]

 1 Drive Device Main Body 2 Disc Brake Device Main Body 3 Cylinder Lid 4 Spline 5 Stator 6 Drive Shaft 7 Spline 8 Rotor 9 Cylinder 10 Piston 11 Pressure Fluid Supply Port 12 Supply Passage 12a Closing Member 13 End Plate 14 Rod Guide 15 Drive Shaft 16 Spline Shaft 17 Spline 18 Hollow Part 19 Cooling Fin 20 Pressure Fluid Supply Port 21 Uniform Load Plate 22 Stator

Claims (5)

[Claims] 1. A disc brake main body which has a cylindrical shape and is attached to the drive device main body, an end plate which is a part of the disc brake main body and is located on the drive device main body side, and a spline formed inside the disc brake main body. A plurality of stators that are fitted into the spline and move along the spline while being restrained from rotating; a spline formed outside a portion connected to the drive shaft protruding from the drive device main body into the disc brake device main body; A plurality of rotors that are fitted into the splines so as to be located between the stators and move along the splines while rotating with the drive shaft; a cylinder lid attached to the disc brake device body on the opposite side of the drive device; A plurality of cylinders provided on the disc brake device body side of the cylinder lid, And a disc brake device fitted to the same cylinder and provided with a piston for pushing the stator and the rotor toward the end plate by a pressure fluid, the disc brake device having a cylindrical spline on which the rotor is fitted. A disc brake device comprising a spline shaft press-fitted into an end portion of the drive shaft while leaving a hollow portion inside. 2. A disc brake main body which is cylindrical and is attached to the drive device main body, an end plate which forms a part of the disc brake main body and is located on the drive device main body side, and a spline formed inside the disc brake main body. A plurality of stators that are fitted into the spline and move along the spline while being restrained from rotating; a spline formed outside a portion connected to the drive shaft protruding from the drive device main body into the disc brake device main body; A plurality of rotors that are fitted into the splines so as to be located between the stators and move along the splines while rotating with the drive shaft; a cylinder lid attached to the disc brake device body on the opposite side of the drive device; A plurality of cylinders provided on the disc brake device body side of the cylinder lid, And a disc brake device fitted to the same cylinder and provided with a piston for pushing the stator and the rotor toward the end plate by a pressure fluid, the disc brake device main body having a cooling fin on an outer peripheral portion thereof. Disc brake device. 3. A disc brake main body which has a cylindrical shape and is attached to the drive device main body, an end plate which forms a part of the disc brake main body and is located on the drive device main body side, and a spline formed inside the disc brake main body. A plurality of stators that are fitted into the spline and move along the spline while being restrained from rotating; a spline formed outside a portion connected to the drive shaft protruding from the drive device main body into the disc brake device main body; A plurality of rotors that are fitted into the splines so as to be located between the stators and move along the splines while rotating with the drive shaft; a cylinder lid attached to the disc brake device body on the opposite side of the drive device; A plurality of cylinders provided on the disc brake device body side of the cylinder lid, And a disc brake device fitted to the cylinder and provided with a piston for pushing the stator and the rotor toward the end plate by a pressure fluid, the pressure fluid radially extending from the center of the cylinder lid and communicating with each of the cylinders. A disc brake device, comprising: a supply passage; and a pressure fluid supply port that opens to a side portion of the cylinder lid and communicates with a collection portion of the radial pressure fluid supply passages at the center of the cylinder lid. 4. A disc brake main body which has a cylindrical shape and is attached to the drive device main body, an end plate which forms a part of the disc brake main body and is located on the drive device main body side, and a spline formed inside the disc brake main body. A plurality of stators that are fitted into the spline and move along the spline while being restrained from rotating; a spline formed outside a portion connected to the drive shaft protruding from the drive device main body into the disc brake device main body; A plurality of rotors that are fitted into the splines so as to be located between the stators and move along the splines while rotating with the drive shaft; a cylinder lid attached to the disc brake device body on the opposite side of the drive device; A plurality of cylinders provided on the disc brake device body side of the cylinder lid, And a disc brake device fitted to the cylinder and having a piston for pushing the stator and the rotor toward the end plate by a pressure fluid, the piston having the same shape as the stator and made of a highly rigid material. A disc brake device comprising a uniform load plate interposed between the piston and a stator closest to the piston. 5. A disc brake main body having a plurality of rod-shaped guides on the outer peripheral portion and attached to a drive device main body, an end plate which forms a part of the disc brake main body and is located on the drive device main body side, and is fitted into the rod-shaped guide. Between the stators, a plurality of stators that move along the rod-shaped guide while being restrained from rotating, a spline formed outside a portion connected to the drive shaft protruding from the drive device main body into the disc brake device main body, and the stator. A plurality of rotors fitted into the same spline so as to be positioned and moving along the same spline while rotating with the drive shaft, a cylinder lid attached to the opposite side of the drive device of the disc brake device body, and the disc of the same cylinder lid A plurality of cylinders provided on the brake device main body side, and a pressure fluid fitted into the cylinders. In a disc brake device including a piston that pushes the stator and the rotor toward the end plate, the outer radius of the stator is made sufficiently larger than the radius of the pitch circle of the rod-shaped guide.