Drum-shot-type brake with "heat pipe"-type cooling

FIELD: transport.

SUBSTANCE: proposed brake comprises brake drum with cooling device, brake shoes with friction linings, show springs, brake disk and drive. Said cooling device represents cylindrical heat pipes arranged in identical-diametre through holes regularly spaced along perimetre at the brake drum center, perpendicular to friction surface. Plugs are arranged in heat pipes, on the side of brake drum rim. There are wedge-like rectangular-section through holes at heat pipes center to receive wedge-like plates to make extra heat exchange surfaces that contact brake drum non-working surfaces by their inner faces. Wedge-like plate outer surface features grooves accommodating spring ring.

EFFECT: reduced thermal load, increased service life.

2 dwg

 

The invention relates to mechanical engineering and can be used in lifting, road and construction machines.

Known self-cooling the brake drum, the rim of the cavity, provided with inlet and outlet valves, which on the outside rim of the brake drum are connected by pipelines. The last in the cooling system are part of the condensation zone [1, similar]. The cooling system is a complex operation, as should be carefully sealed. This significantly increases the construction volume of the brake drum due to its rim cavity.

A device for leveling teploagregaty drum-Shoe brakes, containing the brake drum, the brake pads with the grounds, the friction and heat insert attached to the pad using hollow screws, made in the form of heat pipes. Each heat sink insert the first row under the hollow screw is a hot zone of the heat pipe and are connected by transverse heat-conducting plate with each heat sink insert the second row, located in the middle of the plates, and each end of the second series of hollow screws, i.e. cold zone heat pipes are connected by flexible finned pipe with ends of freegrade hollow screws, being from outside the surface of the base pads and the free edge of the rim of the drum [2, prototype]. This design can only be applied to the brake pads, which are located in the construction volume of the brake drum, but not the outer surface of its rim.

In comparison with analogue and prototype of the proposed technical solution has the following salient features:

- reduced the surface temperature of the friction nodes brakes during braking, thereby keeping the level below are valid for the material of the friction lining, and teploagregaty brake drums in the interval of time between braking, as in a moving vehicle, and is at rest;

- achieved an increase in matte surface heat transfer through the use of clinopodium plates that allows you to have equality between the ratio of the emissivity of Matt surfaces to the polished and the ratio of surface cooling (Matt) to a heated (polished) and thereby provides quasistability thermal condition of the rim of the brake drum;

- provides unequal allocation heat heat pipes due to different extent of their cavities, i.e. the larger side of the flange of the drum is, and the lower side of its free end;

- improved strength of the free edge of the rim of the brake drum due to the use of leptonyx plates, pressed against the outside surface of its rim with clamping ring;

- provides a quasi-permanent level of teploagregaty friction nodes brakes during braking due to the effect of "heat pipe".

The aim of the present invention is to reduce teploagregaty friction nodes brakes during braking and brake drums between braking and increase their resource of friction pairs.

This objective is achieved in that in a drum-type brake cooling device made in the form of cylindrical heat pipes installed in the through holes of the same diameter, arranged with a constant pitch along the perimeter in the middle part of the rim of the brake drum and perpendicular to the friction surface, and in this case, the working surface of the rim of the drum in heat pipes installed in the bracket, and in the middle part of the heat pipes are end-to-end clinophobia holes of rectangular cross-section, in which you installed clinophobia plate, which is the additional heat transfer surfaces in contact with their inner ends with the outside surface of the rim brake is EIT drum, and on the outer surface clinophobia plates between the buildings heat pipes made grooves in which are mounted clamping spring ring.

Figure 1 presents a cross-section of drum-type brakes, and figure 2 is a section along a - a thermal-cooling Assembly with the friction elements of the brake.

Drum-type brake includes brake drum 1 having a rim 2 to 3 working and non-working 4 surfaces. On the last side of the free edge of the rim 2 is a tide in the form of a reinforcing ring 5. In the middle part of the rim 2 of the brake drum 1 is made through holes 6 of the same diameter. Holes 6 are located along the perimeter of the rim 2 with a uniform step and include a cylindrical tube 7, the end of which the cap 8 is flush with the working surface 3 of the rim 2.

The cavity 9 of the cylindrical tube 7 is filled with liquid, for example, 25%ammonia solution having a high latent heat of vaporization. The volume of the cavity 8 and the cylindrical pipe 7 vacuumed that allows you to use the effect of "heat pipe for cooling the friction nodes brakes. In the middle part of the heat pipes 7 are end-to-end clinophobia holes 10 of rectangular cross-section, in which you installed clinophobia plate 11, which is the additional heat transfer surfaces. In addition, Bo is LSI end (height) klinetobe plate 11 abuts against the protrusion reinforcing ring 5 of the rim 2. This clinophobia plate 11 with its inner end surfaces 12 (length) in contact with the outside surface 4 of the rim 2 of the drum 1. On the outer surface 13 clinophobia plates 11 between the heat pipes 7 are grooves 14, which are mounted clamping spring ring 15.

On the opposite side of the rim 2 of the drum 1 is connected with the flange 16, in which holes 17. Using the latest brake drum 1 is attached to the flange 16 of the hub 18 by means of bolts 19. In turn, the flange 16 of the hub 18 from the bottom through a roller bearing 20 rests on the axle 21 of the rear axle.

Inside of the brake drum 1 set of brake pads 22, to the bases 23 are attached with rivets 24 friction lining 25, having a working surface 26.

From outside the base 23 of the pad 22 posted their ribs 27, which are interconnected by finger 28 with the groove 29. In the last planted snatch cylindrical spring 30. With the free edge of the rim 2 of the brake drum 1 has a guide disk 31.

Drum-type brake with cooling type heat pipe operates as follows. Accelerate the vehicle to a predetermined speed and perform its braking. During braking drum brake Shoe Rethimno fist (not showing what) separates the brake pads 22 with a friction lining 25, which interact with their working surfaces 26 with the working surfaces 3 rims 2 brake drums 1. While on the friction surfaces of the brakes will generate some amount of heat, which is further away from the outside surface 4 of the rim 2 of the drum 1 by convection and radiation.

A small part of the heat is given to the conductive heat transfer from the flange 16 of the drum 1 to the hub 18 of the rear axle of the vehicle.

The operation of cooling devices in a drum-type brake in the process of slowing it down and full braking is the following. Part of the surface of the heat pipe 7, which is located in the rim 2 of the brake drum 1 is its evaporation area (a). The remainder of the surface of the heat pipe 7, i.e. extends above the outside surface 3 of the rim 2 is the condensation zone (b). For intensification of heat transfer in heat pipes 7 the condensation zone (b) is provided with an additional heat transfer surfaces, which have clinophobia plate 11 and the snap ring 15. In addition, it should be noted that the coupling between the inner surface 12 klinetobe plate 11 with the outside surface 4 of the rim 2 allows to intensify the conduction mode of heat transfer from the brake drum 1. When calculating the ratio of surface cooling (Matt heated to (polished) brake drum 1 must be equal to the ratio of the emissivity matte to polished to ensure quasistability thermal condition of its rim 2. So for the rear brake drum of the vehicle KrAZ-B, made of cast iron, these surfaces isand emissivity. Therefore, all surfaces clinophobia plate 11 should be opaque and have a total area equal to 0,143 m2that will ensure that the relation.

In the process freezes and the full braking of the vehicle brake drum 1 rotates. Symmetrically located heat pipe 7 will be the top and bottom of the rim 2 of the drum 1.

In those heat pipes 7, which will be located on the top of the rim 2 of the drum 1, the liquid will be in their zone of evaporation (a) and partially sprayed into the condensation zone (b) by the action of centrifugal forces. In those heat pipes 7, which will be located on the bottom of the rim 2 of the drum 1, the liquid will be in the condensation zone (b) and partially sprayed into the evaporation zone (a) by the action of centrifugal forces. In zones of evaporation (a) heat pipes 7, the liquid turns into vapor, and condensation zones (b) is condensed. Thus, the circulation of liquid in the cavity 9 of the heat pipes 7 and will promote intensive remove the heat from the friction pairs of drum-type brakes. In addition, the warmth of resp who is from the outer surfaces of the heat pipes 7 convective, radiative and conductive heat transfer.

After braking the vehicle, the driver removes the load from the brake pedal and using a snatch cylindrical spring 30, the ends of which sit in grooves 29 of the fingers 28, and discharged the brake pads 22 with lining 25 of the working surface 3 of the brake drum 1. After completion of deceleration of the vehicle, the cooling processes of the brake drum 1 continues, but not with the same intensity as before.

Application of the proposed technical solution allows to reduce teploagregaty friction pairs of drum-type brakes, to improve their efficiency and extend the life of the friction elements.

Sources of information

1. A.S. No. 690210 (USSR), CL2. F16D 65833, 1979, BN. No. 17 (similar)

2. Patent 2225544 (Russia), IPC F16D 51/50, 2004, B. I. No. 7 (prototype).

Drum-type brake with cooling type heat pipe containing a brake drum cooling device, the brake pads with friction linings, a garter spring pads, brake disc and the actuator, wherein the cooling device is made in the form of a cylindrical heat pipes installed in the through holes of the same diameter, arranged with a constant pitch along the perimeter in the middle of the rim Tormos the reel and perpendicular to the friction surface and from the side of the working surface of the rim of the drum in heat pipes installed plugs, and in the middle part of the heat pipes are end-to-end clinophobia holes of rectangular cross-section, in which you installed clinophobia plate, which is the additional heat transfer surfaces in contact with their inner ends with the outside surface of the rim of the brake drum, and on the outer surface clinophobia plates between the buildings heat pipes made grooves in which are mounted clamping spring ring.



 

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