KR20210104465A - Drum break apparatus - Google Patents

Abstract

The present invention relates to a drum brake apparatus comprising: a housing; a service brake unit which is installed on one side of the housing and applies pressure on a shoe while being operated by hydraulic pressure during service braking; and a parking brake unit which is installed on the other side of the housing and applies pressure on the shoe while being operated by electromotive force of an actuator during parking braking. The housing comprises: a housing unit; a piston containing unit which is formed as a hollow hole on one side of the housing unit and in which the service braking unit is installed; and a rod containing unit which is formed as a hollow hole on the other side of the housing unit, in which the parking brake unit is installed, and which is placed in a position separated farther from the center of rotation of the shoe than the piston containing unit. The present invention provides an integrated drum brake apparatus which simultaneously performs service braking and parking braking.

Description

Drum brake device {DRUM BREAK APPARATUS}

The present invention relates to a drum brake apparatus, and more particularly, to a drum brake apparatus generating braking force by friction with a drum rotating together with a wheel.

In general, a drum brake is a device that generates braking force by friction with a drum rotating together with a wheel. It uses hydraulic pressure (main braking) or uses a cable connected to the parking brake lever to rub a shoe with a friction material with the drum ( Parking brake) is a device to obtain braking force.

A conventional drum brake includes a drum, a pair of shoes disposed on a back plate to face the inner peripheral surface of the drum and having a friction material attached to the outer periphery, and a wheel cylinder for main steering that receives braking hydraulic pressure to move the shoe outward. In addition, the parking brake operating lever provided in the drum brake has one end shaft-coupled with the shoe and the other end is connected to the parking brake lever provided next to the driver's seat through a cable.

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 2018-0047519 (published on May 10, 2018, title of the invention: vehicle drum brake).

Conventionally, a main braking device for performing main braking and a parking braking device for performing parking braking are separately manufactured and installed. Accordingly, the main brake system and the parking brake system are separately manufactured and managed, and the productivity is reduced due to the hassle of setting, adjusting, designing, and assembling the assembly position that can secure the clearance in consideration of the mutual interference according to the specifications. There is a problem that the unit price decreases and the unit price increases.

Therefore, there is a need to improve it.

An object of the present invention is to provide an integrated drum brake device capable of performing both main braking and parking braking.

A drum brake apparatus according to the present invention includes: a housing; a main moving unit installed on one side of the housing, driven by hydraulic pressure during main actuation, and pressing the shoe; and a parking brake unit installed on the other side of the housing, driven by an electric force of an actuator during parking braking, and pressing the shoe; wherein the housing includes: a housing; a piston accommodating part formed to be hollow on one side of the housing part, and in which the main moving part is installed; and a rod accommodating part formed to be hollow in the other side of the housing part, the parking braking part being installed, and being spaced apart from the rotation center of the shoe from the piston accommodating part.

The housing portion may include: a body portion in which the piston receiving portion and the rod receiving portion are formed; and a fixing part formed on the body part and fixed to the back plate; and a foreign material inflow prevention part coupled to a side of the main body in which the open part of the piston accommodating part and the rod accommodating part are located, and covering the edge of the piston accommodating part and the edge of the rod accommodating part. .

The fixing part may include: a fixing fastening part formed on both sides of the main body part and fixed to the back plate together with the actuator by a fastening member; and a flow prevention part which is formed to protrude at a position corresponding to the main body part of the body part and is fitted into a through-hole part formed in the back plate.

The foreign matter inflow prevention part, a connection part disposed between the opening part of the piston accommodating part and the opening part of the rod accommodating part; a piston sealing part having a ring shape corresponding to the edge of the piston receiving part and continuously formed on one side of the connecting part, the inner end of which is connected to the main moving part; a rod sealing part having a ring shape corresponding to the edge of the rod receiving part and continuously formed on the other side of the connecting part, the inner end of which is connected to the parking braking part; and a body fixing part formed on the connection part and fixed to the body part.

The piston accommodating part is formed to be hollow in a circumferential shape on the housing part, and a cylinder part in which the main moving part is accommodated; and a hydraulic flow passage portion formed to extend from the outer surface of the housing portion to the cylinder portion and forming a passage for supplying a fluid into the cylinder portion.

The rod accommodating part is formed to be hollow in a circumferential shape on the housing part, and a rod cylinder part in which the parking brake part is accommodated; and a drive shaft accommodating part disposed at a set interval from the piston accommodating part, formed in communication with the rod cylinder part, and connected to the parking brake part through which the output shaft of the actuator is drawn in.

The main moving part is disposed at the end of the housing, the piston is moved to the outside of the housing by hydraulic pressure to press the shoe; and an elastic member disposed inside the housing and reducing an impact force acting on the piston returning to the inside of the housing.

The parking brake unit may include a gear unit disposed inside the housing and rotating in association with an actuator; and a rod part connected to the gear part, moving to the outside of the housing in conjunction with the gear part, and pressing the shoe.

The piston receiving part and the rod receiving part are positioned on the same radial extension line with respect to the rotation center of the back plate, and the actuator is positioned on the same radial extension line as the chassis supporting the central part of the back plate, and the bag It is characterized in that it is arranged parallel to the rotation center of the plate.

The drum brake device according to the present invention discloses an integrated main braking and parking braking structure in which a main driving unit and a parking braking unit are mutually coupled to a single housing, thereby performing a simple process of installing the housing to a back plate, followed by a main braking unit and parking braking system. Devices can be installed at the same time.

Accordingly, the present invention separately manufactures and manages the main brake system and the parking brake system, and sets, adjusts, designs, and assembles the assembly position that can secure clearance in consideration of mutual interference according to specifications. , the manufacturing process can be simplified, and the distance between the main engine and parking brake can be further reduced, so that miniaturization and weight reduction can be realized, and space utilization can be improved.

1 is a front perspective view showing an installation state of a drum brake device according to an embodiment of the present invention.
2 is a rear perspective view illustrating an installation state of a drum brake device according to an embodiment of the present invention.
3 is a cross-sectional view showing a main part of a drum brake device according to an embodiment of the present invention.
4 is a front perspective view showing a main body of a drum brake device according to an embodiment of the present invention.
5 is a rear perspective view showing a main body of a drum brake device according to an embodiment of the present invention.
6 is a cross-sectional view taken along line A-A' of FIG. 4 .
7 is a perspective view illustrating a foreign material inflow prevention unit of the drum brake apparatus according to an embodiment of the present invention.
8 is a cross-sectional view taken along line B-B' of FIG. 7 .
9 is a conceptual diagram illustrating a tolerance according to the arrangement of the main moving part and the parking braking part of the drum brake apparatus according to an embodiment of the present invention.
10 is a cross-sectional view taken along line C-C' of FIG. 1 .

Hereinafter, an embodiment of a drum brake device according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a front perspective view showing the installation state of the drum brake device according to an embodiment of the present invention, Figure 2 is a rear side perspective view showing the installation state of the drum brake device according to an embodiment of the present invention, 3 is a cross-sectional view showing a main part of a drum brake device according to an embodiment of the present invention.

1 and 3 , the drum brake device 1 according to an embodiment of the present invention includes a housing 100 , a main driving unit 200 , and a parking braking unit 300 .

The housing 100 is disposed between a pair of left and right shoes 2 . The main moving unit 200 is installed on one side of the housing 100 , is driven by hydraulic pressure during main operation, and presses the shoe 2 . The parking brake unit 300 is installed on the other side of the housing 100 , is driven by electric force during parking braking, and presses the shoe 2 . Both ends of the main body 200 are installed to engage one side of the shoe 2 , and the parking brake 300 is installed to engage the other side of the shoe 2 at a set interval from the main body 200 .

Referring to FIG. 3 , the housing 100 according to an embodiment of the present invention includes a housing part 110 , a piston accommodating part 120 , and a rod accommodating part 130 .

The housing part 110 is a part constituting the basic frame of the housing 100 and has a single block shape. The piston accommodating part 120 is a part where the main moving part 200 is installed, and is formed to be hollow in one side of the housing part 110 . The rod accommodating part 130 is a part where the parking braking part 300 is installed, and is formed to be hollow with the piston accommodating part 120 and a set interval on the other side of the housing part 110 .

Figure 4 is a front perspective view showing the main body of the drum brake device according to an embodiment of the present invention, Figure 5 is a rear perspective view showing the main body of the drum brake device according to an embodiment of the present invention, Figure 6 is a cross-sectional view taken along line A-A' of FIG. 4 .

3 to 5 , the housing part 110 according to an embodiment of the present invention includes a body part 111 , a fixing part 112 , and a foreign substance inflow prevention part 115 .

The main body 111 is disposed to face the actuator 310 with the back plate 5 interposed therebetween. The piston accommodating part 120 and the rod accommodating part 130 are formed to extend laterally on the body part 111, and both ends are formed to be open. The fixing part 112 is a device part fixed to the back plate 5 , and is formed on a rear part of the body part 111 in contact with the back plate 5 . The fixing part 112 according to an embodiment of the present invention includes a fixing fastening part 114 and a flow preventing part 113 .

The fixed fastening part 114 is a device part fixed to the back plate 5 by the fastening member 400 , and is formed on both sides of the main body part 111 . The fixing fastening part 114 is formed with a female screw part to which the fastening member 400 such as bolts can be screwed. Referring to FIG. 2 , the fastening member 400 is fastened to the fastening part 114 by sequentially penetrating the fastening part formed on both sides of the actuator 310 and the back plate 5 to the body part 111 . And the actuator 310 is fixed to the back plate (5). By the fastening of the fastening member 400 , the main body 111 and the actuator 310 are installed in close contact with each other on the front and rear surfaces of the back plate 5 in a state of being coupled to each other.

The flow prevention part 113 is formed to protrude at a position corresponding to the main moving part 200 of the main body part 111 . A through-hole 6 for engagement with the flow preventing unit 113 is formed on the back plate 5 (see FIG. 10 ). For example, the through-hole part 6 may have a horizontally extending rectangular shape, and the flow prevention part 113 may have a rectangular cross-sectional shape corresponding thereto. The flow prevention part 113 has a shape corresponding to the through-hole part 6, and by being inserted into the through-hole part 6, the flow in the up-down direction, left-right direction, etc. is stably restrained while being fixed to the back plate 5. do.

The body part 111 passes through the back plate 5 from the rear of the actuator 310 and flows forward and backward by the fastening member 400 fastened to the front fixed fastening part 114, that is, the actuator 310. The flow in the output axial direction is stably restrained, and the flow in the radial direction of the actuator 310 is stably restrained by the flow preventing part 113 fitted in the through hole 6 formed in the back plate 5 .

7 is a perspective view illustrating a foreign material inflow prevention part of the drum brake apparatus according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line B-B' of FIG. 7 .

The foreign substance inflow prevention part 115 is a device part that prevents foreign substances from flowing into the piston accommodating part 120 and the rod accommodating part 130, and the opening of the piston accommodating part 120 and the rod accommodating part 130 is It is coupled to both sides of the body portion 111 to be located. The foreign material inflow prevention part 115 is made of a material having a soft or flexible nature, and is installed to cover the edge of the piston accommodating part 120 and the edge of the rod accommodating part 130 .

Accordingly, the foreign matter inflow prevention unit 115 does not impede the operation of the main moving unit 200 and the parking brake unit 300, and restricts the main moving unit 200 from being separated to the outside of the piston receiving unit 120. At the same time, the parking brake unit 300 serves to restrain the departure of the rod receiving unit 130 from the outside. 7 and 8 , the foreign material inflow prevention part 115 according to an embodiment of the present invention includes a connection part 116 , a piston sealing part 117 , a rod sealing part 118 , and a body fixing part 119 . includes

The connection part 116 is disposed between the opening of the piston accommodating part 120 and the opening of the rod accommodating part 130 formed on the side surface of the main body 111 . The piston sealing part 117 has a shape corresponding to the edge of the piston receiving part 120 and is formed continuously with the connecting part 116 . The rod sealing part 118 has a shape corresponding to the edge of the rod receiving part 130 and is continuously formed on the other side of the connecting part 116 .

When the piston accommodating part 120 is disposed above the rod accommodating part 130, the connection part 116 is disposed between the piston accommodating part 120 and the rod accommodating part 130, and the piston sealing part 117. is integrally formed with the connecting portion 116 at the upper portion of the connecting portion 116 , and the rod sealing portion 118 is integrally formed with the connecting portion 116 at the lower portion of the connecting portion 116 .

The open part of the piston accommodating part 120 has a circular shape, and the piston sealing part 117 has a ring shape corresponding to the edge of the piston accommodating part 120 . The edge portion of the piston receiving portion 120 is formed to protrude from the body portion 111 to a set thickness. Referring to FIG. 3 , the outer periphery of the piston sealing part 117 covers the edge of the piston accommodating part 120 and is closely attached to and fixed to the housing part 110 . The inner peripheral part 117a of the piston sealing part 117 crosses the opening of the piston receiving part 120 and the main moving part 200 and, more specifically, a coupling groove formed in the piston 210 of the main moving part 200 ( 211) and connected to the piston 210.

The open part of the rod receiving part 130 has a circular shape, and the rod sealing part 118 has a ring shape corresponding to the edge of the rod receiving part 130 . The edge portion of the rod receiving portion 130 is formed to protrude from the body portion 111 to a set thickness. Referring to FIG. 3 , the outer periphery of the rod sealing part 118 covers the edge of the rod accommodating part 130 and is closely adhered to and fixed to the housing part 110 . The inner peripheral portion 118a of the rod sealing portion 118 crosses the open portion of the rod receiving portion 130 to the parking brake portion 300 and, more specifically, formed around the push rod 332 of the parking brake portion 300 . It is fitted into the groove and is connected to the push rod 332 .

A fluid for creating a hydraulic atmosphere may be introduced into the piston accommodating part 120 , and a lubricant for smooth operation of the gear part 320 and the rod part 330 may be introduced into the rod accommodating part 130 . have. According to the piston sealing part 117 and the rod sealing part 118, the fluid inside the piston receiving part 120 and the rod receiving part 130 is prevented from being lost to the outside through the opening part, and at the same time, the main moving part 220 and It is possible to prevent foreign substances from penetrating into the parking brake unit 300 .

The body fixing part 119 is a device part for firmly fixing and binding the foreign material inflow prevention part 115 to the body part 111 , and is formed on the connection part 116 . The body fixing part 119 may have a structure of a hole through which a fastening means such as a bolt can pass. The connection part 116 is disposed between the piston sealing part 117 and the rod sealing part 118 , and the body fixing part 119 is formed on the connection part 116 . Therefore, by fixing the body fixing part 119 to the body part 111 using a fastening means, the piston sealing part 117 and the rod sealing part 118 can be firmly coupled to the body part 111 .

4 to 6 , the piston accommodating part 120 according to an embodiment of the present invention includes a cylinder part 121 and a hydraulic flow passage part 122 .

The cylinder part 121 is a space part in which the main moving part 200 is accommodated, and is formed to be cylindrically hollow on the housing part 110 . The cylinder part 121 is formed to cross the housing part 110 in the left and right direction, and both ends are formed to be open on the side surface of the housing part 110 . The hydraulic flow passage part 122 is a part forming a supply path for creating a hydraulic atmosphere in the cylinder part 121 , and is formed to extend from the outer surface of the housing part 110 to the cylinder part 121 .

The outer end of the hydraulic flow passage part 122 is formed to be opened on the flow prevention part 113 provided on the rear surface of the main body part 111 . Since the flow prevention part 113 is exposed to the rear of the back plate 5 through the through-hole part 6 , a plurality of parts including a pair of shoes 2 installed in front of the back plate 5 and the like Without interference, the fluid can be stably supplied from the rear of the back plate 5 to the inside of the cylinder part 121 through the hydraulic flow passage part 122 .

The inner end of the hydraulic flow passage unit 122 communicating with the cylinder unit 121 is formed to face the elastic member 220 of the main moving unit 200 installed inside the cylinder unit 121 . The left and right pair of hydraulic flow passages 122 gradually narrow in a V-shape from the outer end toward the inner end. Accordingly, the fluid introduced into the hydraulic flow passage part 122 is directed toward the elastic member 220 disposed in the middle portion of the cylinder part 121 .

According to the structure of the hydraulic flow passage part 122 , the fluid introduced into the cylinder part 121 interferes with the elastic member 220 and can be evenly distributed and diffused into the cylinder part 121 , and the cylinder part In the process of introducing the fluid into the interior of the 121 , it is possible to solve the problem of repeatedly applying an unbalanced impact to the inner wall of the cylinder 121 or one side of the piston 210 .

4 to 6 , the rod accommodating part 130 according to an embodiment of the present invention includes a rod cylinder part 131 and a driving shaft accommodating part 132 .

The rod cylinder part 131 is a space part in which the rod part 330 of the parking brake part 300 and the driven gear 322 of the gear part 320 are accommodated, and is formed to be cylindrically hollow on the housing part 110 . do. The rod cylinder part 131 crosses the housing part 110 in the left and right directions and is disposed in parallel with the cylinder part 121 , and both ends are formed to be open on the side surface of the housing part 110 .

The drive shaft accommodating part 132 is a space in which the drive gear 321 of the gear part 320 of the parking brake part 300 and the output shaft of the actuator 310 are accommodated, and is formed in communication with the load cylinder part 131 . The output shaft of the actuator 310 is introduced into the housing 110 through the drive shaft accommodating part 132 , and is connected to the gear part 320 of the parking brake part 300 .

The drive shaft accommodating part 132 is disposed at a set interval from the piston accommodating part 120 . The distance between the drive shaft accommodating part 132 and the piston accommodating part 120 can be freely expanded and variable in a range that does not interfere with each other and can be applied. As the distance between the drive shaft accommodating part 132 and the piston accommodating part 120 is reduced, the volume and weight of the housing part 110 can be reduced. In addition, according to this structure, it is realized by reflecting all of the casing thickness of the main brake device, the casing thickness of the parking brake device, and the clearance between the main brake device and the parking brake device in the prior art in which the main brake device and the parking brake device were separately provided. It is possible to realize miniaturization to a degree that was impossible to do.

1 and 3 , the main moving part 200 according to an embodiment of the present invention includes a piston 210 and an elastic member 220 .

The piston 210 presses the shoe 2 toward the drum (not shown) or releases the pressurizing while moving in and out of the cylinder part 121 along the cylinder part 121 by hydraulic pressure. In an embodiment of the present invention, a pair of left and right pistons 210 are disposed at both ends of the cylinder unit 121 . At the end of the piston 210 exposed to the outside of the cylinder part 121 , a coupling groove part 211 and a shoe coupling part 212 are formed.

The coupling groove 211 is formed in a circular shape along the periphery of the outer surface of the piston 210 , and the inner peripheral portion 117a of the piston sealing portion 117 is fitted and coupled thereto. The inner peripheral portion 117a of the piston sealing portion 117 is fitted into the coupling groove portion 211 and fixed, thereby sealing the cylinder portion 121 . The shoe coupling part 212 has a slit shape into which the end of the shoe 2 can be inserted, and is installed in engagement with the shoe 2 .

As the pressure inside the cylinder unit 121 increases when the fluid flows in through the hydraulic flow path unit 122, the left and right pair of pistons 210 move by extension in which the mutual separation distance is further expanded, and the left and right pair of shoes (2) is pushed out. Through this process, the subject movement is performed. As the pressure inside the cylinder part 121 is reduced when the fluid is discharged through the hydraulic flow path part 122, the left and right pair of pistons 210 make a reduced movement to make the separation distance between each other closer, and the left and right pair of shoes (2) is released from the push. Through this process, the subject movement is released.

The elastic member 220 is disposed inside the cylinder part 121 , and is disposed between the pair of pistons 210 . The elastic member 220 is disposed between the pair of pistons 210 to prevent the pair of pistons 210 from colliding directly with each other while returning to the inside of the cylinder part 121, and to the piston 210. Reduces the impact force acting on it. In addition, the elastic member 220 may interfere with the fluid flowing between the pair of pistons 210 through the hydraulic flow passage 122 to evenly distribute and spread the hydraulic pressure. As the elastic member 220, an elastic spring or the like may be applied.

1 and 3 , the parking brake unit 300 according to an embodiment of the present invention includes an actuator 310 , a gear unit 320 , and a rod unit 330 .

The gear unit 320 is a device unit that receives rotational driving force from the actuator 310 and transmits it to the rod unit 330 , and has a structure of a worm wheel gear and is disposed inside the rod receiving unit 130 . The main driving gear 321 of the gear unit 320 has a worm gear structure, is installed in the drive shaft accommodating part 132, and is coaxially connected with the output shaft of the actuator 310 drawn into the drive shaft accommodating part 132. . The driven gear 322 of the gear unit 320 has a wheel gear meshing with the worm gear, and is disposed in the middle of the rod cylinder unit 131 .

The rod part 330 is a device part that converts the rotational displacement of the gear part 320 into linear displacement and transfers it to the shoe 2 , and includes a rotational rod 331 and a push rod 332 , and a rod cylinder part 131 . is installed on The rotating rod 331 is made of a single rod member, and is connected coaxially with the driven gear 322 . The push rod 332 is connected to the end of the rotation rod 331 by having a screw coupling portion with the rotation rod 331 , and moves in and out of the rod cylinder unit 131 in association with the rotation and movement of the rotation rod 331 . and press the shoe (2) to the drum side or release the pressurization.

In an embodiment of the present invention, a pair of left and right push rods 332 are disposed at both ends of the rod cylinder unit 131 . The end of the push rod 332 exposed to the outside of the rod cylinder 131 has the same structure as the end of the piston 210 in which the coupling groove 211 and the shoe coupling 212 are formed. The inner peripheral portion 118a of the rod sealing portion 118 is fitted and fixed in the groove formed around the outer surface of the push rod 332, so that the rod cylinder portion 131 is sealed by the rod sealing portion 118. . And, the end of the push rod 332 has a slit shape into which the end of the shoe 2 can be inserted, and is installed in engagement with the shoe 2 .

When the actuator 310 is driven in the forward direction, the rotational force of the actuator 310 is transmitted to the rotating rod 331 through the gear unit 320 , and the rotating rod 331 is rotated in the forward direction in conjunction with the gear unit 320 . . At this time, the pair of push rods 332 move along the rotating rod 331 to extend the separation distance from each other, and push the left and right pair of shoes 2 . Through this process, parking braking is performed. When the actuator 310 is driven in the reverse direction, the pair of push rods 332 perform a reduced movement that is closer to each other, and release the pushing of the pair of left and right shoes 2 . Through this process, the runner brake is released.

9 is a conceptual diagram illustrating a tolerance according to the arrangement of the main driving unit and the parking brake unit of the drum brake apparatus according to an embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line C-C' of FIG.

When the drum brake is used, the friction pad 3 attached to the shoe 2 is worn, and the clearance between the shoe 2 and the drum (not shown) is varied due to the wear of the friction pad 3 . The gap between the shoe 2 and the drum may be corrected to be kept constant by the parking brake unit 300 even if the friction pad 3 is worn.

The length of the parking brake unit 300 is elastically variable depending on the driving state of the actuator 310 , and the pair of shoes 2 is pressed by the elastic member 7 in a mutually adjacent direction while the parking brake unit 300 is pressed. ) according to the length of the substantially mutually spaced distance can be determined.

When the actuator 310 is driven in the forward direction, the length of the parking brake unit 300 is extended and the left and right pair of shoes 2 are pushed in a direction to be spaced apart from each other to perform parking braking. When the actuator 310 is driven in the reverse direction, the parking brake is released as the pressing force pushing the shoe 2 is released. can

1 and 10, the rod accommodating part 13 is disposed at a position spaced apart from the pivot accommodating part 120 from the rotation center C1 of the shoe 2 . This means that the parking braking unit 300 installed in the rod accommodating part 13 is spaced apart from the rotational center C1 of the shoe 2 rather than the main driving part 200 installed in the piston accommodating part 120. it means.

When the main driving unit 200 is disposed at a position more distant from the rotation center C1 of the shoe 2 than the parking braking unit 300, the return position of the shoe 2 by the parking braking unit 300 as described above; Alternatively, when the tolerance d1 is generated in adjusting and correcting the gap between the shoe and the drum, the tolerance d2 of the main driving unit 200 is the tolerance of the parking brake unit 300 as shown in FIG. It is formed larger than (d1) (d2>d1).

When the rod accommodating part 130 is disposed at a position spaced apart from the piston accommodating part 120 from the rotational center C1 of the shoe 2 as in an embodiment of the present invention, the tolerance (d2) of the main moving part 200 is formed to be smaller than the tolerance d1 of the parking brake unit 300 (d2<d1) as shown in FIG. 9(b) . Accordingly, even if the parking brake unit 300 has the same degree of tolerance d1 with respect to the shoe 2 , the main moving unit 200 is farther from the parking brake unit 300 from the rotation center C1 of the shoe 2 . It has a smaller tolerance d2 compared to the embodiment arranged in .

By disposing the rod accommodating part 130 at a position spaced apart from the piston accommodating part 120 from the rotation center part C1 of the shoe 2, the tolerance d1 of the parking braking part 300 generated to the same degree as above. For this, the tolerance d2 of the main body 200 can be clearly reduced. Accordingly, even if the tolerance d2 is generated in the process of correcting the gap between the shoe 2 and the drum by the parking brake unit 300 , the operational reliability of the main driving unit 200 can be stably maintained.

Referring to FIG. 10 , the piston accommodating part 120 and the rod accommodating part 130 of the housing 100 are disposed on one side (front side) of the back plate 5 as a reference, and the actuator is on the other side (rear side). 310 is disposed. A central portion of the back plate 5 is supported by a chassis 8 of the vehicle body, and the chassis 8 is disposed on the other side of the actuator 310 .

By arranging the parking brake unit 300 at a position more spaced apart from the rotation center portion C1 of the shoe 2 than the main movement portion 200 , the actuator 310 of the parking brake unit 300 is moved to the rotation center of the back plate 5 . It can be arranged more spaced apart from (C2). Accordingly, there is no need to tilt the actuator 310 in consideration of interference with the chassis 8 or to apply a complicated structure of forming a step in a portion of the housing 110 facing the chassis 8 .

That is, in arranging the actuator 310 on the same radial extension line L2 as the chassis 8 supporting the central portion of the back plate 5 , the actuator 310 is positioned to minimize interference with the chassis 8 . Without tilting downward toward the front, it can be arranged in parallel with the rotation center portion (C2) of the back plate (5).

Accordingly, in consideration of the inclination of the actuator 310 or the relative angle of the piston receiving part 120 and the rod receiving part 130, the piston receiving part 120 and the rod receiving part 130 have a relative angle. Without difficulty in design and manufacture for arranging (to be arranged in a direction perpendicular to the output shaft of the actuator 310), the piston accommodating part 120 and the rod accommodating part 130 are rotated at the center of rotation of the back plate 5 (C2) It can be arranged on the same radial extension line L1 with respect to . Accordingly, the manufacturability and processability of the housing 100 can be further improved, and thus the cost can be reduced.

In addition, by arranging the parking braking unit 300 at a position more spaced apart from the rotation center C1 of the shoe 2 than the main driving unit 200 , the interference with the chassis 8 is stably prevented in disposing the actuator 310 . Since it can be avoided, the thickness of the housing part 110, more specifically, the thickness of the lower part of the rear part of the housing part 110 positioned between the actuator 310 and the chassis 8 (an embodiment of the present invention) In the vertical direction thickness of the fixing portion 112 or the flow preventing portion 113) can be applied thicker, it is possible to stably secure the rigidity of the housing portion (110).

According to the drum brake device 1 according to the present invention having the above configuration, the main braking and parking braking integrated structure in which the main driving unit 200 and the parking braking unit 300 are mutually coupled to one housing 100 is disclosed. Accordingly, the main brake device and the parking brake device can be installed simultaneously through a simple process of installing the housing 100 on the back plate 5 .

Accordingly, the present invention separately manufactures and manages the main brake system and the parking brake system, and sets, adjusts, designs, and assembles the assembly position that can secure clearance in consideration of mutual interference according to specifications. , the manufacturing process can be simplified, and the distance between the main driving unit 200 and the parking braking unit 300 can be further reduced, so that miniaturization and weight reduction can be realized, and space utilization can be improved.

1: drum brake device 2: shoe
5: back plate 6: through hole part
100: housing 110: housing unit
111: body part 112: fixed part
113: flow prevention part 114: fixed fastening part
115: foreign matter inflow prevention part 116: connection part
117: piston sealing part 118: rod sealing part
119: body fixing part 120: piston receiving part
121: cylinder part 122: hydraulic flow passage part
130: rod receiving part 131: rod cylinder part
132: drive shaft accommodating part 200: main east part
210: piston 220: elastic member
300: parking brake 310: actuator
320: gear part 330: rod part
400: fastening member

Claims (9)

housing;
a main moving unit installed on one side of the housing, driven by hydraulic pressure during main actuation, and pressing the shoe; and
and a parking brake part installed on the other side of the housing, driven by the electric power of an actuator during parking braking, and pressing the shoe;
The housing is
housing unit;
a piston accommodating part formed to be hollow on one side of the housing part, and in which the main moving part is installed; and
and a rod accommodating part formed to be hollow in the other side of the housing part, the parking braking part being installed, and being spaced apart from the rotation center of the shoe from the piston accommodating part.
According to claim 1,
The housing part,
a body portion in which the piston accommodating part and the rod accommodating part are formed; and
a fixing part formed on the body part and fixed to the back plate; and
Drum comprising a; is coupled to the side of the main body portion on which the opening portion of the piston receiving portion and the rod receiving portion are located, and covering the edge of the piston receiving portion and the outer edge of the rod receiving portion; brake device.
3. The method of claim 2,
The fixing part,
a fixed fastening part formed on both sides of the main body part and fixed to the back plate together with the actuator by a fastening member; and
and a flow preventing part which is formed to protrude at a position corresponding to the main moving part of the main body and is fitted into a through hole formed in the back plate.
3. The method of claim 2,
The foreign matter inflow prevention unit,
a connection part disposed between the opening part of the piston accommodating part and the opening part of the rod accommodating part;
a piston sealing part having a ring shape corresponding to the edge of the piston receiving part and continuously formed on one side of the connecting part, the inner end of which is connected to the main moving part;
a rod sealing part having a ring shape corresponding to the edge of the rod receiving part and continuously formed on the other side of the connecting part, the inner end of which is connected to the parking braking part; and
and a main body fixing part formed on the connection part and fixed to the main body part.
According to claim 1,
The piston receiving part,
a cylinder part formed to be hollow in a cylindrical shape on the housing part, and in which the main moving part is accommodated; and
and a hydraulic oil passage portion extending from the outer surface of the housing portion to the cylinder portion and forming a passage for supplying a fluid into the cylinder portion.
6. The method of claim 1 or 5,
The load receiving unit,
a rod cylinder part formed to be hollow in a cylindrical shape on the housing part and accommodating the parking brake part; and
and a drive shaft accommodating part disposed at a set interval from the piston accommodating part, formed in communication with the rod cylinder part, and connected to the parking brake part through which the output shaft of the actuator is drawn in.
According to claim 1,
The subject dong is,
a piston disposed at an end of the housing, moving to the outside of the housing by hydraulic pressure, and pressing the shoe; and
and an elastic member disposed inside the housing and reducing an impact force acting on the piston returning to the inside of the housing.
According to claim 1,
The parking brake unit,
a gear unit disposed inside the housing and rotating in association with the actuator; and
and a rod part connected to the gear part, moving to the outside of the housing in conjunction with the gear part, and pressing the shoe.
According to claim 1,
The piston receiving part and the rod receiving part are positioned on the same radial extension line with respect to the rotation center of the back plate,
The actuator is positioned on the same radial extension line as the chassis supporting the central portion of the back plate, and is arranged in parallel with the rotation center of the back plate.

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