阅读说明：本技术 鼓刹机构 (Drum brake mechanism ) 是由 许志明 许文涛 于 2021-01-25 设计创作，主要内容包括：本发明公开了鼓刹机构,属于车辆制动技术领域,避免内部弹簧在制动过程中弯曲伸缩,减少弹簧损耗,使用寿命长,本发明的鼓刹机构,包括外壳、安装于所述外壳上的刹车轴和刹车组件,所述外壳上还设有摇臂,所述摇臂一端与所述刹车轴连接,另一端连接刹车线,刹车线拉动所述摇臂使其摆动,以使所述刹车轴驱动所述刹车组件动作进行制动,所述外壳上还设有摇臂复位件,所述摇臂复位件包括弹簧和限位件,所述弹簧在结束制动后为所述摇臂提供复位力,所述限位件限定所述弹簧沿直线方向伸缩。(The invention discloses a drum brake mechanism, which belongs to the technical field of vehicle braking, and has the advantages of avoiding the bending and expansion of an internal spring in the braking process, reducing the loss of the spring and having long service life.)

1. Drum mechanism of stopping, including the shell, install in brake axle and brake subassembly on the shell, still be equipped with the rocking arm on the shell, rocking arm one end with brake hub connection, the brake cable is connected to the other end, and the brake cable pulling the rocking arm makes its swing, so that the brake axle drive the brake subassembly action is braked, a serial communication port, still be equipped with the rocking arm on the shell and reset the piece, the rocking arm resets and includes spring and locating part, the spring does after the end braking the rocking arm provides restoring force, the locating part is injectd the spring is flexible along the sharp direction.

2. The drum brake mechanism of claim 1, wherein the retainer comprises a guide shaft extending through the spring, the spring extending and retracting in an axial direction of the guide shaft.

3. The drum brake mechanism of claim 2, wherein the guide shaft is threadedly fitted with an adjusting nut, and the spring force of the spring is adjusted by adjusting the position of the adjusting nut on the guide shaft.

4. The drum brake mechanism of claim 2, wherein the spring is a compression or extension spring.

5. The drum brake mechanism of claim 2, wherein the rocker reset further comprises a slider slidably mounted on the guide shaft for transferring the force between the rocker and the spring.

6. The drum brake mechanism according to claim 5, wherein a sliding groove is formed in the housing, the guide shaft is mounted in the sliding groove, the slider is located in the sliding groove, a transmission portion extending out of the sliding groove is formed in the slider, and the transmission portion is kept against the side portion of the rocker arm.

7. The drum brake mechanism according to claim 6, wherein the contact surface between the transmission part and the rocker arm is a convex arc surface, the inner wall of the sliding groove is further provided with a limiting groove, and the sliding block is provided with a limiting block inserted into the limiting groove for circumferentially positioning the sliding block.

8. The drum brake mechanism of claim 1, wherein the retainer comprises a sleeve, the spring being mounted within the sleeve.

9. The drum brake mechanism of claim 8 wherein the sleeve has an axially disposed through slot, the rocker arm extending through the through slot and being capable of oscillating relative to the sleeve to compress the spring during oscillation.

10. The drum brake mechanism of claim 8, wherein the sleeve is provided with a through groove arranged along an axial direction, the rocker arm reset member further comprises a slider slidably mounted in the sleeve, the slider abuts or is connected with the spring, the slider is provided with a transmission part extending out of the through groove, and the transmission part abuts against the rocker arm.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of vehicle braking, in particular to a drum brake mechanism.

[ background of the invention ]

The drum brake has low cost and strong absolute braking force, so the drum brake is applied to vehicles for a history of nearly a century. The existing drum brake comprises a shell, two brake pads and a push block are arranged in the shell, and the push block pushes the brake pads to move outwards to be attached to the shell for braking. The movement of the push block is generally controlled by a rocker arm and a brake cable connected with the rocker arm, and the resetting of the rocker arm generally provides elastic restoring force for the rocker arm by arranging a spring between the tail end of the rocker arm and the shell, but the spring is easy to damage in the process of extending and retracting along with the movement of the rocker arm due to the arc-shaped movement track of the end part of the rocker arm.

[ summary of the invention ]

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the drum brake mechanism, so that the inner spring is prevented from bending and stretching in the braking process, the spring loss is reduced, and the service life is long.

In order to solve the technical problems, the invention adopts the following technical scheme:

drum mechanism of stopping, including the shell, install in brake axle and brake subassembly on the shell, still be equipped with the rocking arm on the shell, rocking arm one end with brake hub connection, the brake cable is connected to the other end, and the brake cable pulling the rocking arm makes its swing, so that the brake axle drive the brake subassembly action is braked, still be equipped with the rocking arm on the shell and reset the piece, the rocking arm resets the piece and includes spring and locating part, the spring does after the end braking the rocking arm provides restoring force, the locating part is injectd the spring is flexible along sharp direction.

Further, the limiting part comprises a guide shaft penetrating through the spring, and the spring extends and retracts along the axial direction of the guide shaft.

Furthermore, an adjusting nut is installed on the guide shaft in a threaded fit mode, and the elastic force of the spring is adjusted by adjusting the position of the adjusting nut on the guide shaft.

Furthermore, the spring is a compression spring or a tension spring.

Further, the rocker arm reset piece also comprises a sliding block which is slidably mounted on the guide shaft and used for transmitting the acting force between the rocker arm and the spring.

Furthermore, a sliding groove is formed in the shell, the guide shaft is installed in the sliding groove, the sliding block is located in the sliding groove, a transmission portion extending out of the sliding groove is formed in the sliding block, and the transmission portion is kept against the side portion of the rocker arm.

Furthermore, the transmission part and the contact surface of the rocker arm are convex cambered surfaces, the inner wall of the sliding groove is further provided with a limiting groove, and the sliding block is provided with a limiting block inserted into the limiting groove and used for circumferentially positioning the sliding block.

Further, the stopper includes a sleeve, and the spring is mounted in the sleeve.

Furthermore, the sleeve is provided with a through groove arranged along the axial direction, and the rocker arm penetrates through the through groove and can swing relative to the sleeve so as to extrude the spring in the swinging process.

Furthermore, be equipped with the logical groove that sets up along the axial on the sleeve, the rocking arm piece that resets still includes slidable mounting in the slider in the sleeve, the slider with the spring offsets or links to each other, be equipped with on the slider and stretch out the transmission portion that leads to the groove, transmission portion with the rocking arm keeps offsetting.

The invention has the beneficial effects that:

the drum brake mechanism provided by the invention is the same as the prior art in that a brake cable brakes by controlling the swinging of the rocker arm, and the rocker arm drives the brake shaft to rotate when rotating so as to realize braking by controlling the synchronous motion of the brake device through the brake shaft;

during the braking process, the rocker arm swings, the center of the swinging circle of the rocker arm is located on the axis of the brake shaft, the spring is driven by the rocker arm to move and accumulate elastic force during the swinging process, after the braking is stopped, the elastic force of the spring is released to act on the rocker arm to reset the rocker arm, and in the process, the contraction and the extension of the spring limit the telescopic direction under the action of the limiting part, namely the spring stretches in the linear direction without bending, so that the spring is not easy to damage and has longer service life.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of a drum brake mechanism according to an embodiment of the present invention;

FIG. 2 is a schematic view of the drum brake mechanism according to an embodiment of the present invention;

FIG. 3 is an exploded view of the drum brake mechanism in an embodiment of the present invention;

FIG. 4 is yet another exploded view of the drum brake mechanism in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a rocker arm with a rotating sleeve according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a rocker arm and a sleeve when the limiting member is the sleeve according to an embodiment of the present invention;

fig. 7 is a matching view B of the rocker arm and the sleeve when the limiting member is the sleeve according to the embodiment of the present invention.

Reference numerals:

a housing 100, a brake shaft 110, a brake assembly 120;

a rocker arm 200, a rotation slot 210;

a spring 300;

a guide shaft 400, an adjusting nut 410, a hexagonal nut 420 and an annular groove 430;

a slider 500, a transmission part 510, and a stopper 520;

mounting part 600, sliding groove 610, limiting groove 620, rotating hole 630, bolt 640, sleeve 650 and through hole

The groove 651, the through hole 660;

the sleeve 700 is rotated.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 to 4, an embodiment of the invention discloses a drum brake mechanism, which includes a housing 100, a brake shaft 110 and a brake assembly 120, the brake shaft 110 and the brake assembly 120 are mounted on the housing 100, a rocker arm 200 is further disposed on the housing 100, one end of the rocker arm 200 is connected with the brake shaft 110, the other end of the rocker arm is connected with a brake cable, the brake cable pulls the rocker arm 200 to swing, so that the brake shaft 110 drives the brake assembly 120 to act to perform braking, a rocker arm reset member is further disposed on the housing 100, the rocker arm reset member includes a spring 300 and a limiting member, the spring 300 provides a reset force for the rocker arm 200 after braking is completed, and the limiting.

As in the prior art, the brake assembly 120 includes a brake wheel and a roller arranged on the brake shaft 110, and a brake shoe is further arranged in the housing 100, when braking, a brake cable pulls the rocker arm 200 to swing, when the rocker arm 200 rotates, the brake shaft 110 and the brake wheel on the brake shaft 110 are driven to rotate, and the brake wheel makes the roller push the brake shoe, so that braking can be achieved;

during the braking process, the rocker arm 200 swings, the center of the swing is located on the axis of the brake shaft 110, in the swinging process, the spring 300 is driven by the rocker arm 200 to move and accumulate elastic force, after the braking is stopped, the elastic force of the spring 300 is released to act on the rocker arm 200 to reset the rocker arm 200, in the process, the contraction and extension of the spring 300 limits the expansion direction under the action of the limiting piece, namely the spring 300 expands and contracts in the linear direction without bending, so that the spring 300 is not easy to damage, and the service life is longer.

Preferably, the limiting member includes a guide shaft 400, the spring 300 is sleeved on the guide shaft 400, the spring 300 can extend and contract along the axial direction of the guide shaft 400 under the limitation of the guide shaft 400, so that the extending and contracting direction is limited, the spring 300 cannot bend, the radial displacement is limited, and the movement track of the spring 300 is ensured to be a straight line.

Since the spring 300 is fitted around the guide shaft 400, the swing arm 200 cannot be guaranteed to maintain contact with the spring 300 during the swing, in order to facilitate the transmission of the force between the rocker arm 200 and the spring 300, the rocker arm restoring member further includes a slider 500, the slider 500 is slidably mounted on the guide shaft 400, the slider 500 abuts against the side of the rocker arm 200 and abuts against or is connected to the end of the spring 300, used for transmitting the thrust of the rocker arm 200 to the spring 300 and the elastic force of the spring 300 to the rocker arm 200, the rocker arm 200 can push the slider 500 to move when being pulled by a brake cable to swing, the slider 500 drives the spring 300 to synchronously change when moving, after braking is finished, the elastic force of the spring 300 acts on the rocker arm 200 through the slider 500 to drive the rocker arm 200 to reset, and the slider 500 is used as an acting force conducting component between the rocker arm 200 and the spring 300, so that the drum brake can be prevented from being stuck due to accidents, and normal braking cannot be realized.

Preferably, the spring 300 is a compression spring, one side of the slider 500 is abutted against the spring 300, and the other side is abutted against the rocker arm 200, so that elastic force can be accumulated during compression, and the elastic force accumulated by the spring 300 after expansion can be released and applied to the rocker arm 200. In addition, the spring also can be the extension spring, if the spring is the extension spring, then need keep being connected with the slider, one side of slider links to each other with the spring and offsets with the rocking arm simultaneously, and the rocking arm swing drives the extension of extension spring, and when the extension spring resets, drive slider and rocking arm reset.

Further, be equipped with installation department 600 at the shell 100 lateral part, be equipped with spout 610 on the installation department 600, the guiding axle 400 is established in spout 610, and slider 500 and spring 300 all are located spout 610 to avoid spring 300 and slider 500 to be touched by the mistake and influence the normal function of drum stopping.

In order to be matched with the rocker arm 200, the slider 500 needs to extend out of the sliding groove 610 and then contact with the rocker arm 200, so that the slider 500 comprises a transmission part 510 provided with the extending sliding groove 610, the transmission part 510 extends out of the sliding groove 610 and then abuts against the side part of the rocker arm 200, when the rocker arm 200 swings, the slider 500 can extrude the spring 300 by pushing the transmission part 510, in order to reduce friction between the rocker arm 200 and the transmission part 510 in the swinging process, the end surface of the transmission part 510 is a convex arc surface, the arc surface is in surface and line contact with the rocker arm 200, the abrasion between the arc surface and the rocker arm 200 is small, and the transmission. In addition, the transmission part can also be rotatably arranged on the sliding block, so that the transmission part can convert the friction force between the transmission part and the sliding block into the power rotating relative to the sliding block in the swinging process of the rocker arm, and the generation of the friction force is reduced. In addition, the slide block and the transmission part can be in inclined surface fit transmission.

Because the contact surface between the transmission part 510 and the rocker arm 200 is a convex arc surface, in the swing process of the rocker arm 200, the rocker arm 200 applies a thrust force on the transmission part 510 in the radial direction of the guide shaft 400, which causes the slider 500 to rotate relative to the guide shaft 400 and causes the transmission part 510 to be out of contact with the rocker arm 200, thus causing the rocker arm 200 not to be reset, the sliding groove 610 is further provided with a limit groove 620, the slider 500 is provided with a limit block 520 inserted into the limit groove 620 to limit the circumferential motion of the slider 500, thus the transmission part 510 can be kept against the rocker arm 200, and the slider 500 is not pushed to rotate around the guide shaft 400 in the swing process of the rocker arm 200.

Referring to fig. 1 to 4, the force required for the return of the rocker arm 200 is provided by the spring 300, if the elastic force of the spring 300 is insufficient, the rocker arm 200 cannot be completely returned, the drum brake still has a certain braking capability, which affects driving, and the drum brake is worn very much, and when the length of the spring 300 is a certain value, the greater the compression, the greater the spring force, and, based on the above-described embodiment, in another embodiment of the invention, the spring 300 need not be replaced, the elasticity of the spring 300 is changed by adjusting the length of the spring 300, specifically, the guide shaft 400 is provided with a section of external thread and an adjusting nut 410 which is arranged on the guide shaft 400 in a thread fit manner, one end of the spring 300 is abutted against the slider 500, the other end of the spring 300 is abutted against the adjusting nut 410, and the adjusting nut 410 can move on the guide shaft 400 by rotating the adjusting nut 410 to adjust the distance between the adjusting nut and the slider 500, so that the length of the spring 300 between the adjusting nut and the slider is changed.

When the elastic force of the spring 300 needs to be increased, the distance between the slider 500 and the adjusting nut 410 is shortened, and when the elastic force of the spring 300 needs to be reduced, the distance between the slider 500 and the adjusting nut 410 is increased.

Referring to fig. 1 to 4, further, based on the above-mentioned embodiment, in another embodiment of the present invention, in order to facilitate the rotation of the adjustment nut 410, the guide shaft 400 is rotatably mounted on the mounting portion 600, the side surface of the adjustment nut 410 abuts against the side wall of the sliding groove 610, the guide shaft 400 is rotated to move the adjustment nut 410 along the guide shaft 400, the sliding groove 610 can restrict the rotation of the adjustment nut 410 by engaging with the adjustment nut 410, and when the guide shaft 400 rotates, the adjustment nut 410 keeps stationary in the circumferential direction and can move in the axial direction of the guide shaft 400, so that the adjustment can be performed by only rotating the guide shaft 400 without disassembling and assembling the guide shaft 400.

In order to rotate the guide shaft 400 conveniently, the inner wall of the sliding groove 610 is provided with a rotation hole 630, one end of the guide shaft 400 is inserted into the rotation hole 630, the other end of the guide shaft 400 extends out of the sliding groove 610 and is fixedly provided with the hexagonal nut 420, and when the guide shaft 400 needs to be rotated, the hexagonal nut 420 can be rotated conveniently.

In order to facilitate installation of the guide shaft 400, the guide shaft 400 is configured to be inserted into the installation portion 600, and during installation, the guide shaft 400 is inserted into the installation portion 600, the slider 500, the spring 300 and the adjusting nut 410 are sequentially installed at the end portion of the guide shaft, and the end portion is inserted into the rotation hole 630 in alignment, so that installation can be completed.

Referring to fig. 1 to 4, based on the above-mentioned embodiment, the guide shaft 400 has a tendency to move in the axial direction when the slider 500 slides, and therefore, the guide shaft 400 needs to be axially limited, in another embodiment of the present invention, the mounting portion 600 is provided with the latch 640 disposed along the radial direction of the guide shaft 400, and the latch 640 can abut against the guide shaft 400 to limit the axial displacement of the guide shaft 400, so that the axial direction of the guide shaft 400 is limited and no axial change occurs during the braking process.

In order to prevent the pin 640 from affecting the rotation of the guide shaft 400, the circumferential direction of the guide shaft 400 is recessed inwards to form the annular groove 430, the pin 640 is clamped into the annular groove 430, the guide shaft 400 does not collide with the pin 640 when rotating through the cooperation of the annular groove 430 and the pin 640, and when the guide shaft 400 moves axially, the side wall of the guide shaft 400 abuts against the pin 640 to limit the axial movement of the guide shaft 400.

Referring to fig. 5, unlike the above-described embodiment, in another embodiment of the present invention, a rotary sleeve 700 is slidably mounted on the rocker arm 200, the rotary sleeve 700 is rotatable with respect to the rocker arm 200, and the guide shaft 400 is capable of restricting the rotation of the rotary sleeve 700 with respect to the guide shaft 400, so that the rotary sleeve 700 is rotatable with respect to the rocker arm 200 and slides along the guide shaft 400 while the rotary sleeve 700 also slides on the rocker arm 200 as the rocker arm 200 swings.

Referring to fig. 6 and 7, unlike the above-described embodiment, in another embodiment of the present invention, the stopper is a sleeve 650, and the spring 300 is installed in the sleeve 650.

The sleeve 650 can limit the radial movement of the spring 300 so that it can avoid bending to the side when the spring 300 is contracted.

Specifically, in order to allow the rocker arm 200 to smoothly push the spring 300, a through groove 651 is axially formed in the sleeve 650, and the rocker arm 200 penetrates the through groove 651 and can swing relative to the sleeve 650 to press the spring 300 during a swing process. During braking, the rocker arm 200 oscillates relative to the spring 300 while moving relative to the channel 651, the sleeve 650 does not restrict the oscillation of the rocker arm 200 by the channel 651, the rocker arm 200 can also compress the spring 300 during oscillation, and the channel 651 does not tend to bend the spring 300.

Alternatively, the slider 500 is slidably mounted in the sleeve 650, the slider 500 abuts against the spring 300, the slider 500 includes the transmission part 510 provided with the protruding through groove 651, and the transmission part 510 abuts against the rocker arm 200, so that the slider 500 can move by contacting with the transmission part 510 when the rocker arm 200 swings, and the spring 300 is pressed at the same time, thereby achieving the same technical effect.

Referring to fig. 1 to 4, in another embodiment of the present invention, the mounting portion 600 further includes a through hole 660, the rocker arm 200 further includes a rotation groove 210, the rotation groove 210 rotatably mounts a rotation portion (not shown), and the brake cable passes through the through hole 660 to be connected to the rotation portion, so that when the rocker arm 200 is pulled by the brake cable to swing, the rotation member can rotate relative to the rocker arm 200 to prevent the brake cable from bending.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.