CN208719202U - A kind of drive mechanism - Google Patents

Abstract

The utility model provides a kind of drive mechanism, belong to braking equipment field, including parking piston, accumulation of energy spring abutment, ratchet assembly and front cover, accumulation of energy spring abutment is bolted in front cover, ratchet assembly includes ratchet, reset spring and spring pocket, spring pocket is fixedly connected with accumulation of energy spring abutment, reset spring is connected between spring pocket and ratchet, reset spring enables ratchet have the trend mobile towards spring pocket, the trapezoidal external screw thread of non-self-lock-ing is provided on ratchet, it parks piston to be spirally connected and ratchet, parks piston and be slidably connected with front cover.Drive mechanism provided by the utility model is when in use, piston is parked usually as driving link, during piston is parked in movement, ratchet can be rotated relative to front cover, it can also be relative to front cover along linear slide, and original position can be finally returned to by reset spring, structure is simple, easy to operate.

Description

A kind of drive mechanism

Technical field

The utility model relates to braking equipment fields, in particular to a kind of drive mechanism.

Background technique

Usually configuration is a set of checking cylinder, a set of hand brake, checking cylinder completion row in railway wagon braking system Vehicle brakes (service braking, emergency braking), use when hand brake is usually parked in situations.Transmission component is braking Essential part in cylinder.

Inventor has found that existing checking cylinder at least has the disadvantage in that the transmission in existing checking cylinder under study for action Modular construction is complicated, processing and manufacturing trouble.

Utility model content

The purpose of this utility model is to provide a kind of drive mechanisms, to improve the transmission component knot in existing checking cylinder Structure is complicated, fabricates troublesome problem.

The utility model is realized in this way:

Based on above-mentioned purpose, the utility model provides a kind of drive mechanism, including parks piston, accumulation of energy spring abutment, spine Wheel assembly and front cover, the accumulation of energy spring abutment are bolted in the front cover, and the ratchet assembly includes ratchet, reset spring and spring Set, the spring pocket is fixedly connected with the accumulation of energy spring abutment, the reset spring be connected to the spring pocket and the ratchet it Between, the reset spring enables the ratchet have the trend mobile towards the spring pocket, is provided with non-self-lock-ing on the ratchet Trapezoidal external screw thread, the externally threaded center line is parallel with the direction relatively moved between the spring pocket and the ratchet, institute State the internal screw thread for parking and being provided on piston and matching with the trapezoidal external screw thread of the non-self-lock-ing, it is described park piston be spirally connected with it is described Ratchet, the piston of parking are slidably connected with the front cover, described to park the direction and institute that piston is slided relative to the front cover It is parallel to state externally threaded centerline direction.

In an embodiment of the present embodiment: the ratchet is provided with the first convex block and through-hole, first convex block In the through-hole, and first convex block around the through-hole axial line in a ring, the ratchet assembly further includes spring Seat and retaining ring, the retaining ring are installed on the ratchet, and the retaining ring is located in the through-hole, and the retaining ring and the through-hole are coaxial Setting, in a ring, and the spring base is between the reset spring and the retaining ring, the reset spring for the spring base The spring base is enabled to be connected to the retaining ring.

In an embodiment of the present embodiment: being provided with the second convex block, second convex block position on the spring pocket In one end of the spring pocket, the project radially outward spring pocket of second convex block along the spring pocket, the spring One end that set is provided with second convex block is arranged towards first convex block, and the reset spring is sheathed on the spring pocket, One end of the reset spring is connected to the spring base, and the other end of the reset spring is connected to second convex block.

In an embodiment of the present embodiment: the outer diameter of the second convex block is less than the internal diameter of the ratchet, and described the The outer diameter of two convex blocks is greater than the internal diameter of first convex block.

In an embodiment of the present embodiment: internal diameter of the spring pocket close to one end of second convex block is greater than The internal diameter of the spring pocket other end.

In an embodiment of the present embodiment: the length of the spring pocket is greater than first convex block and the retaining ring The distance between.

In an embodiment of the present embodiment: be provided with multiple card slots on the ratchet, multiple card slots around The axial line interval of the through-hole is arranged, and one end of the card slot extends to the end face of the ratchet, and the card slot is located at institute State the one end of ratchet far from the spring pocket.

In an embodiment of the present embodiment: the card slot includes two side walls, described in a side wall passes through The axial line of ratchet, another described sidewall slope setting, enables the width of the card slot be gradually reduced along its direction that is recessed.

In an embodiment of the present embodiment: the drive mechanism further includes limit sleeve, and the limit sleeve is sheathed on Described to park piston, the limit sleeve is located at described park between piston and the accumulation of energy spring abutment.

Based on above-mentioned purpose, the utility model additionally provides a kind of drive mechanism, including park piston, accumulation of energy spring abutment, Block, ratchet assembly and front cover, the block are connected in the front cover, and the accumulation of energy spring abutment is bolted in the front cover, the storage For energy spring abutment between the block and the ratchet assembly, the ratchet assembly includes ratchet, reset spring and spring pocket, institute It states spring pocket to be fixedly connected with the accumulation of energy spring abutment, the reset spring is connected between the spring pocket and the ratchet, institute Stating reset spring enables the ratchet have the trend mobile towards the spring pocket, and it is trapezoidal outer that non-self-lock-ing is provided on the ratchet Screw thread, the externally threaded center line is parallel with the direction relatively moved between the spring pocket and the ratchet, described to park The internal screw thread matched with the trapezoidal external screw thread of the non-self-lock-ing is provided on piston, the piston of parking is spirally connected and the ratchet, The piston of parking is slidably connected with the front cover, described to park the direction and the outer spiral shell that piston is slided relative to the front cover The centerline direction of line is parallel.

Compared with prior art, beneficial effect of the utility model is:

Drive mechanism provided by the utility model when in use, parks piston usually as driving link, parks work in movement During plug, ratchet can be rotated relative to front cover, can also be relative to front cover along linear slide, and finally can be by multiple Position spring returns to original position, and structure is simple, easy to operate.

Detailed description of the invention

It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Required practical attached drawing is briefly described in specific embodiment or description of the prior art, it should be apparent that, it is described below Attached drawing be that some embodiments of the utility model are not paying creative labor for those of ordinary skill in the art Under the premise of dynamic, it is also possible to obtain other drawings based on these drawings.

Fig. 1 shows the schematic diagram of the drive mechanism of the offer of the utility model embodiment 1；

When Fig. 2 shows the rail freight braking force holder of the offer of the utility model embodiment 2 in the braking state Schematic diagram；

Fig. 3 shows the rail freight braking force holder of the offer of the utility model embodiment 2 in relieved state Schematic diagram；

Fig. 4 shows the cylinder seat of the offer of the utility model embodiment 2 and the connection schematic diagram of cylinder body；

Fig. 5 shows the schematic diagram of the piston component of the offer of the utility model embodiment 2；

Fig. 6 shows the piston schematic diagram of the offer of the utility model embodiment 2；

Fig. 7 shows the partial schematic diagram of the piston of the offer of the utility model embodiment 2；

Fig. 8 shows the schematic diagram of the piston rod of the offer of the utility model embodiment 2；

Fig. 9 shows the partial schematic diagram of the piston rod of the offer of the utility model embodiment 2；

Figure 10 shows the schematic diagram of the retaining mechanism of the offer of the utility model embodiment 2；

Figure 11 shows the schematic diagram of the front cover of the offer of the utility model embodiment 2；

Figure 12 shows the schematic diagram for parking piston of the offer of the utility model embodiment 2；

Figure 13 shows the schematic diagram of the clamping assembly of the offer of the utility model embodiment 2；

Figure 14 shows the schematic diagram of the ratchet assembly of the offer of the utility model embodiment 2；

Figure 15 shows the schematic diagram of the ratchet of the offer of the utility model embodiment 2；

Figure 16 shows the schematic diagram of the spring pocket of the offer of the utility model embodiment 2；

Schematic diagram Figure 17 shows the resilient sleeve of the offer of the utility model embodiment 2 at the first visual angle；

Figure 18 shows schematic diagram of the resilient sleeve at the second visual angle of the offer of the utility model embodiment 2.

In figure: 10- cylinder seat；11- opening；

20- cylinder body；

30- front cover；31- first segment；32- second segment；

40- retaining mechanism；41- air inlet seat；42- parks piston；421- riser；422- transverse slat；43- accumulation of energy spring abutment； 44- energy-storaging spring；45- chamber；46- resilient sleeve；461- clamping groove；462- mounting ring；The 463- conical surface；47- ratchet assembly； 471- ratchet；The first convex block of 4711-；4712- card slot；472- reset spring；473- retaining ring；474- spring pocket；4741 second is convex Block；- 475- spring base；476- inclined wedge；477- thrust bearing；

50- piston component；51- piston；511- mounting portion；The clamping portion 512-；513- piston seal；514- leather cup lock Circle；515- guidance tape；52- piston rod；521- push rod headstock；522- push rod；523- inner hole；524- groove；The inclined-plane 525-；

60- release spring；

70- clamping assembly；71- pawl base；72- pawl；73- elastic component；74- pull ring；

80- cavity.

Specific embodiment

The utility model is further described in detail below through specific implementation examples and in conjunction with the accompanying drawings.

To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, above in conjunction with the utility model Attached drawing in embodiment clearly and completely describes the technical scheme in the embodiment of the utility model, it is clear that retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.

Therefore, the above detailed description to the embodiments of the present invention provided in the accompanying drawings is not intended to limit requirement The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all Belong to the range of the utility model protection.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.

In the description of the present invention, it should be understood that indicating position or the term of positional relationship are based on attached drawing Shown in orientation or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than indication or suggestion institute The equipment or element of finger must have a particular orientation, is constructed and operated in a specific orientation, therefore should not be understood as to this reality With novel limitation.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, or integral；It can be mechanical connection, be also possible to electricity Connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary The interaction relationship of element.For the ordinary skill in the art, above-mentioned term can be understood as the case may be Concrete meaning in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature is on or below second feature It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature the Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is in the second spy Under sign, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of fisrt feature level Height is less than second feature.

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.

Embodiment 1

Referring to Fig.1, a kind of drive mechanism is present embodiments provided, including parks piston 42, accumulation of energy spring abutment 43, ratchet assembly 47 and front cover 30, accumulation of energy spring abutment 43 is bolted in front cover 30, and ratchet assembly 47 includes ratchet 471, reset spring 472 and spring pocket 474, spring pocket 474 is fixedly connected with accumulation of energy spring abutment 43, and reset spring 472 is connected between spring pocket 474 and ratchet 471, Reset spring 472 enables ratchet 471 have the trend mobile towards spring pocket 474, is provided with the trapezoidal outer spiral shell of non-self-lock-ing on ratchet 471 Line, the direction relatively moved between externally threaded center line and spring pocket 474 and ratchet 471 is parallel, parks and is arranged on piston 42 There is the internal screw thread matched with the trapezoidal external screw thread of non-self-lock-ing, parks piston 42 and be spirally connected and ratchet 471, park piston 42 and front cover 30 It is slidably connected, it is parallel with externally threaded centerline direction to park the direction that piston 42 is slided relative to front cover 30.

Drive mechanism provided in this embodiment when in use, parks piston 42 usually as driving link, parks work in movement Plug 42 during, ratchet 471 can rotate relative to front cover 30, can also relative to front cover 30 along linear slide, and finally Original position can be returned to by reset spring 472, structure is simple, easy to operate.

Embodiment 2

Referring to Fig. 2 to Figure 18, the present embodiment provides a kind of rail freight braking force holders, including cylinder seat 10, piston Component 50, cylinder body 20, front cover 30, release spring 60 and retaining mechanism 40.

Refering to Fig. 4, cylinder seat 10 connect the cavity 80 for forming a sealing with cylinder body 20 and front cover 30, and piston component 50 delays Solution spring 60 and retaining mechanism 40 are installed in the cavity 80, and opening 11 is provided in cylinder seat 10, and opening 11 connects with cavity 80 Logical, piston component 50 is slidably connected with cylinder body 20, and piston component 50 can reciprocatingly slide in cavity 80, retaining mechanism 40 For fixed piston component 50, the both ends of release spring 60 connect release spring 60 with piston component 50 and retaining mechanism 40 respectively Enable piston component 50 and retaining mechanism 40 that there is the trend being located remotely from each other.

Refering to Fig. 5 to Fig. 9, piston component 50 includes piston 51, piston seal 513 and piston rod 52, and piston 51 includes Mounting portion 511 and clamping portion 512, clamping portion 512 are arranged around the circumferential direction of mounting portion 511, are provided with seal groove on clamping portion 512, Seal groove around clamping portion 512 axial line in a ring, piston seal 513 is connected in seal groove, piston rod 52 and installation Portion 511 connects.The one end of clamping portion 512 far from mounting portion 511 and the axial line of mounting portion 511 are vertically arranged.Clamping portion 512 One end far from mounting portion 511 is equipped with guidance tape 515, and guidance tape 515 is wound in clamping portion 512.It is also set on clamping portion 512 It is equipped with leather cup retainer 514, leather cup retainer 514 is used for fixed piston sealing ring 513.

Inner hole 523 and push rod headstock 521 are provided on piston rod 52, push rod headstock 521 is located in inner hole 523, push rod cup Seat 521 is welded in mounting portion 511.Inner hole 523 extends along the direction of axis line of piston rod 52, and the diameter of inner hole 523 is along piston The direction of axis line of bar 52 is gradually reduced, and push rod headstock 521 is located at one end that inner hole 523 is relatively large in diameter.Push rod headstock 521 Diameter is greater than the minimum diameter of inner hole 523.The both ends of inner hole 523 extend respectively to the both ends of piston rod 52.It is set on piston rod 52 It is equipped with push rod 522, push rod 522 is inserted into piston rod 52 from the lesser one end of inner hole 523, and push rod 522 is located in inner hole 523 One end is connect with push rod headstock 521.The length of push rod 522 is greater than the length of piston rod 52.

Multiple grooves 524 are provided on piston rod 52, multiple grooves 524 are set along the direction of axis line interval of piston rod 52 Set, groove 524 around piston rod 52 axial line in a ring.Side wall of the groove 524 close to the side of push rod headstock 521 is provided with Inclined-plane 525, inclined-plane 525 enable the width of groove 524 be gradually reduced along its direction that is recessed.The minimum widith of groove 524 is greater than adjacent The distance between two grooves 524.The region of groove 524 is less than the half of the length of piston rod 52.

Refering to fig. 10, retaining mechanism 40 includes front cover 30, air inlet seat 41, energy-storaging spring 44, accumulation of energy spring abutment 43, parks Piston 42, ratchet assembly 47 and resilient sleeve 46, accumulation of energy spring abutment 43 are installed on front cover 30, park piston 42 and the sliding of front cover 30 connects It connects, energy-storaging spring 44 is installed on accumulation of energy spring abutment 43 and parks between piston 42, and energy-storaging spring 44 enables accumulation of energy spring abutment 43 and parks Piston 42 has the trend that is relatively distant from, parks one chamber 45 of formation between piston 42 and front cover 30, air inlet seat 41 it is defeated Outlet is connected to chamber 45, and ratchet assembly 47 is connect with piston 42 is parked, and ratchet assembly 47 can be with parking piston 42 Mobile, one end of resilient sleeve 46 is provided with multiple conical surfaces 463, and multiple conical surfaces 463 are arranged around the axial line of resilient sleeve 46, ratchet group Part 47 is mobile to enable multiple conical surfaces 463 shrink or open.

1 and Figure 12 refering to fig. 1, front cover 30 include first segment 31 and second segment 32, and first segment 31 forms a mounting hole, stops The axial line that plug 42 is let live along mounting hole is slided relative to front cover 30, and second segment 32 is located at the end of first segment 31, and second segment 32 extending radially inwardly along first segment 31；It parks piston 42 and includes transverse slat 422 and riser 421, transverse slat 422 and ratchet assembly 47 connections, energy-storaging spring 44 are connected to riser 421, and riser 421 is connected to first segment 31, and riser far from one end of transverse slat 422 Sealing ring is installed, second segment 32 is connected to transverse slat 422, transverse slat 422 far from one end of first segment 31 between 421 and first segment 31 Sealing ring is also equipped between second segment 32.

Refering to fig. 13, clamping assembly 70 is provided on front cover 30, and clamping assembly 70 includes pawl base 71, pawl 72, elasticity Part and pull ring 74, pawl base 71 are installed on front cover 30, and pawl 72 is slidably connected with pawl base 71, radial direction of the pawl 72 along front cover 30 It is slided relative to pawl base 71, one end of pawl 72 is caught in card slot 4712, and elastic component is installed on pawl base 71 and pawl 72 Between, elastic component enables pawl 72 have the trend mobile towards card slot 4712, and pull ring 74 is installed on the other end of pawl 72.

Air pressure retaining mechanism 40 further includes retaining ring 473, and the outer ring of retaining ring 473 is connected in front cover 30, the inner ring of retaining ring 473 It is connected in resilient sleeve 46, and accumulation of energy spring abutment 43 is between retaining ring 473 and energy-storaging spring 44.

4 and Figure 15 refering to fig. 1, ratchet assembly 47 include ratchet 471, reset spring 472, spring pocket 474, spring base 475, Inclined wedge 476 and two retaining rings 473, ratchet 471 are provided with the first convex block 4711 and through-hole, and the first convex block 4711 is located in through-hole, And first convex block 4711 around through-hole axial line in a ring, retaining ring 473 is installed in through-hole, and retaining ring 473 and through-hole are coaxially disposed, Two retaining rings 473 are located at the two sides of the first convex block 4711, and retaining ring 473 and the first convex block 4711 interval are arranged, spring base 475 in a ring, and spring base 475, between reset spring 472 and retaining ring 473, one end of reset spring 472 is connected to bullet Spring abutment 475, the other end of reset spring 472 are connected to spring pocket 474, and reset spring 472 enables spring base 475 be connected to retaining ring 473, reset spring 472 enables spring pocket 474 have the trend mobile towards the first convex block 4711, and inclined wedge 476 and spring pocket 474 divide Not Wei Yu the first convex block 4711 two sides, inclined wedge 476 and ratchet 471 are coaxially disposed, and the internal diameter of inclined wedge 476 is along far from first The direction of convex block 4711 is gradually increased, and spring base 475 and inclined wedge 476 are stuck in through-hole by two retaining rings 473 respectively.

Wherein, through-hole is divided into two parts by the first convex block 4711, and through-hole is used to install the length of one end of spring pocket 474 More than or equal to the length of the other end.

Inclined wedge 476 and ratchet 471 are rotatablely connected, and inclined wedge 476 is rotated along its axial line relative to ratchet 471.Ratchet assembly 47 further include two thrust bearings 477, and two thrust bearings 477 are respectively arranged in the both ends of inclined wedge 476, and inclined wedge 476 is by pushing away Power bearing 477 is connect with ratchet 471.

Refering to fig. 16, the second convex block 4741 is provided on spring pocket 474, and the second convex block 4741 is located at the one of spring pocket 474 End, the second convex block 4741 project radially outward spring pocket 474 along spring pocket 474, and spring pocket 474 is provided with the second convex block 4741 One end be arranged towards the first convex block 4711, reset spring 472 is sheathed on spring pocket 474, and one end of reset spring 472 is connected to Retaining ring 473, the other end of reset spring 472 are connected to the second convex block 4741.Before assembling, the second convex block 4741 is in reset spring It is connected under the action of 472 on first convex block 4711.

The length of spring pocket 474 is greater than the distance between the first convex block 4711 and retaining ring 473.The outer diameter of spring base 475 with The internal diameter of ratchet 471 is equal, and the internal diameter of spring base 475 is equal with the outer diameter of spring pocket 474.The outer diameter of second convex block 4741 is small In the internal diameter of ratchet 471, and the outer diameter of the second convex block 4741 is greater than the internal diameter of the first convex block 4711.Spring pocket 474 is close to second The internal diameter of one end of convex block 4741 is greater than the internal diameter of 474 other end of spring pocket.Reset spring 472 is the spring in compressive state.

Refering to fig. 15, multiple card slots 4712 are provided on ratchet 471, and multiple card slots 4712 are between the axial line of through-hole Every setting, one end of card slot 4712 extends to the end face of ratchet 471, and card slot 4712 is located at ratchet 471 far from spring pocket 474 One end.Card slot 4712 includes two side walls, and a side wall passes through the axial line of ratchet 471, and the setting of another sidewall slope enables card The width of slot 4712 is gradually reduced along its direction that is recessed.In this way, ratchet 471 can only be along one after having thing to be caught in card slot 4712 A direction rotation.

The trapezoidal external screw thread of non-self-lock-ing, externally threaded center line and spring are provided on the outer peripheral surface of the other end of ratchet 471 The direction relatively moved between set 474 and ratchet 471 is parallel, parks and is provided on piston 42 and the trapezoidal external screw thread matching of non-self-lock-ing The internal screw thread of conjunction parks piston 42 and is spirally connected and ratchet 471.When ratchet 471 rotates forward, ratchet 471 and to park piston 42 opposite Mobile, when ratchet 471 rotates backward, ratchet 471 is located remotely from each other with piston 42 is parked, and card slot 4712 includes two side walls, and one Side wall passes through the axial line of ratchet 471, and the setting of another sidewall slope enables the width of card slot 4712 gradually subtract along its direction that is recessed It is small, on the direction that ratchet 471 rotates forward, the forward sidewall slope setting of card slot 4712.In the present embodiment, in scheme It is forward direction from right clockwise direction to the left, from right counter clockwise direction to be to the left reversed in scheming.

7 and Figure 18 refering to fig. 1, one end of resilient sleeve 46 are provided with multiple conical surfaces 463, and multiple conical surfaces 463 are around resilient sleeve 46 The setting of axial line interval, the multiple conical surfaces 463 form petal-shapeds, and the end of each conical surface 463 is provided with the first protrusion, and first is convex It rises towards the axial line of resilient sleeve 46 and is arranged.First protrusion extends along the direction of axis line of resilient sleeve 46, and resilient sleeve 46 is along remote Direction from the conical surface 463 extends.

Clamping groove 461, radially outward recess of the clamping groove 461 along resilient sleeve 46, card are provided on the inner wall of resilient sleeve 46 Access slot 461 extends along the axial line of resilient sleeve 46, and the both ends of clamping groove 461 extend respectively to two end faces of resilient sleeve 46. Clamping groove 461 is set as multiple, and multiple clamping grooves 461 are arranged around the axial line interval of resilient sleeve 46.Clamping groove 461 is set as 6 It is a.

The other end of resilient sleeve 46 is provided with mounting ring 462, and the diameter of mounting ring 462 is less than the diameter of resilient sleeve 46, peace Screw thread is provided on dress ring 462.Multiple second protrusions, axis of multiple second protrusions around mounting ring 462 are provided in mounting ring 462 The setting of heart line interval, the second protrusion project radially outward mounting ring 462 along mounting ring 462.It is provided in mounting ring 462 scarce Mouthful, notch around mounting ring 462 axial line in a ring, radially-inwardly recess of the notch along mounting ring 462.Notch and the second protrusion Interval setting, and notch is located between the second protrusion and resilient sleeve 46.

The structure and mounting means of rail freight braking force holder provided in this embodiment are such that

Push rod headstock 521 is put into from 523 big end of inner hole of piston rod 52 in piston component 50, but cannot be scurried out from small end. Piston rod 52 is weldingly connected with piston 51, and guidance tape 515 is mounted in the outer circle of piston 51, and sealing ring is mounted on the ditch of piston 51 In slot 524, leather cup retainer 514 locks sealing ring on piston 51.Specifically 52 excircle of piston rod has annular ditch groove 524, the resilient sleeve 46 when brake force is kept in retaining mechanism 40 blocks the protrusion, prevents piston rod 52 from retreating, and realizes locking.

Piston rod 52 can also be no raised, but polished rod, passes through increasing friction force (active force for increasing energy storage spring) Piston rod 52 can be clamped motionless, play the role of parking.

Retaining mechanism 40 is connected by 6 bolts with cylinder seat 10.Air inlet seat 41 is welded on front cover 30, the pressure of train pipe Power air is entered by the aperture of air inlet seat 41 parks 42 right side of piston, is the action signal of retaining mechanism 40.At front cover 30 Sealing ring is installed, completes the sealing for parking 42 right chamber 45 of piston, the chamber 45 jointly with the sealing ring parked on piston 42 It is known as parking cylinder chamber 45.

Accumulation of energy spring abutment 43 is threadedly coupled with front cover 30, and energy storage spring is pressed in the left side for parking piston 42, is installed at front cover 30 Retaining ring 473 prevents the rotation of accumulation of energy spring abutment 43 from exiting.Limit sleeve, which is through, to be parked on piston 42, and the decrement of energy storage spring is limited.

Parking 42 inner circle of piston is non-self-lock-ing trapezoidal thread, is engaged with the screw thread of the ratchet 471 in ratchet assembly 47.

In ratchet assembly 47, return spring set 474 is blocked by spring pocket 474 when installation, and spring is reconditioned before assembling and is pressed in On ratchet 471, reset spring 472 are blocked by retaining ring 473.Inclined wedge 476 is mounted on the right of ratchet 471,476 both sides of inclined wedge point Other installed thrust bearing 477, and blocked with hole retaining ring 473.

476 inner surface of inclined wedge and the conical surface 463 of resilient sleeve 46 cooperate, and inclined wedge 476 will be converted into radial force by axial force And amplify, enlargement ratio is determined by the cone angle of inclined wedge 476, which promotes resilient sleeve 46 is radial to collapse.

471 outer circle of ratchet is non-self-lock-ing trapezoidal thread, engages with the screw thread for parking piston 42, has in another end outer circle Tooth, towards 471 direction of ratchet, ratchet 471 can be rotated counterclockwise, and shown as 471 opposing pistons 51 of ratchet and stretched out to the right, up time Needle can not be rotated due to there is the blocking of pawl 72.

Resilient sleeve 46 passes through ratchet assembly 4737 and is threadedly coupled with accumulation of energy spring abutment 43, blocks resilient sleeve by specific purpose tool 466 card slots 4712 rotate, and retaining ring 473 prevents the rotation of resilient sleeve 46 from exiting.46 annular projection of resilient sleeve supports piston rod 52, 52 joining seam of piston rod is prevented, 46 protrusion seized piston bar 52 when parking (brake force holding) of resilient sleeve forms parking brake (brake force holding).Resilient sleeve 46 is in petal type, and the conical surface 463 is understood by after radial force to radial gathering.

Resilient sleeve 46 can also increase protrusion, by increasing the active force of energy storage spring, increase resilient sleeve 46 and light piston The chucking power of bar 52 plays the purpose for preventing piston rod 52 from retracting, reaches the function of parking.

The mode of braking of rail freight braking force holder is that pressure air enters the left side of piston component 50, is pushed Piston 51 is moved to braking direction (to the right), and brake force pushes push rod 522 by push rod headstock 521, and push rod 522 pushes basic system Dynamic device generates brake force.

The working principle of rail freight braking force holder in the present embodiment are as follows:

(1) unlocked state is inflated:

In the process of moving, the pressure air of train pipe is filled with by air inlet seat 41 parks 42 right side of piston, pressure to train Contracting energy-storaging spring 44 is parked piston 42 and is no longer moved downward until limit sleeve limit, work of the ratchet 471 in reset spring 472 It is moved downward under, inclined wedge 476 is driven to move downward, until ratchet 471 contacts accumulation of energy spring abutment 43, retaining mechanism 40 is in unlock State, piston rod 52 can move at this time.

(2) it is vented lockup state:

When train braking, train pipe decrease in air pressure, what is be attached thereto parks the pressure reduction on the right side of piston 42, when Pressure air acts on when parking the power on piston 42 and being not enough to balance the active force of energy storage spring, and piston 42 is parked in energy storage spring promotion It moves right, parks piston 42 and push ratchet 471 to move right by screw thread engagement, since engagement screw thread is non-self-lock-ing screw thread, Ratchet 471 has the trend rotated forward, but the card slot 4712 of 471 periphery of ratchet is limited by pawl 72, positive can not turn Dynamic, ratchet 471 can only move right at this time with piston 42 is parked.During ratchet 471 moves right, push bearing and Inclined wedge 476 is pushed to move right, the inner surface of inclined wedge 476 is bonded with the conical surface 463 of resilient sleeve 46, in the work of energy-storaging spring 44 Under, resilient sleeve 46 is radial to be collapsed, seized piston bar 52, and is against at the groove 524 of piston rod 52, and piston rod 52 cannot It retracts.Even if the pressure air in 51 left side of piston has been sewed, piston rod 52 also can be maintained at retarder location under the action of energy storage spring It sets.

When train is alleviated, the air pressure in chamber 45 is increased, and promotion is parked piston 42 and moved downward, until limit Set blocks and cannot continue, while ratchet 471 drives inclined wedge 476 to retract, and completes the unlock of retaining mechanism 40.

(2) manual unlocking state:

Retaining mechanism 40, can also be with manual unlocking other than inflating unlock.Cylinder chamber is parked when not having pressure air to be filled with When 45 (parking 42 right side of piston) need to unlock again, pull ring 74 is pulled, pawl 72 leaves the card slot 4712 of ratchet 471, ratchet 471 rotate forward under the action of reset spring 472, and move downward, and inclined wedge 476 is driven to move downward, and resilient sleeve 46 is bored The axial force in face 463 disappears, and resilient sleeve 46 is restored, and resilient sleeve 46 disengages piston rod 52, work of the piston rod 52 in release spring 60 With lower rollback, until piston 51 contacts cylinder seat 10.In the process, piston 42 is parked to move to right, it is complete until touching front cover 30 It is unlocked at retaining mechanism 40.

In conclusion rail freight braking force holder provided by the utility model, after braking action occurs for vehicle, Declined using train tube pressure as signal, by a set of retaining mechanism, cylinder body inner piston is unable to return, and brake force is protected always It holds or even in the case that cylinder interior pressure air leakage is zero, brake force is still always maintained at, and brake force holding is automatic 's.When needing to alleviate, air inlet seat inflation, retaining mechanism unlock, retentivity disappearance, checking cylinder alleviation.When train pipe cannot When inflation retaining mechanism can also be unlocked, realizes that checking cylinder is alleviated by discharging pull ring.

In addition, existing railway wagon braking the cylinder piston is mostly cast-iron piston, weight weight, assembling labour is by force Degree is big, and especially when checking cylinder overhauls in each rolling stock section, due to being the operation under vehicle, working space is narrow, and labor intensity is bigger. Piston in the utility model can be the steel plate punched using 7mm, and the more original cast-iron piston of piston component weight can decline 42% (305 × 254 type checking cylinder).

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of drive mechanism, which is characterized in that including parking piston, accumulation of energy spring abutment, ratchet assembly and front cover, the energy storage spring Seat is bolted in the front cover, and the ratchet assembly includes ratchet, reset spring and spring pocket, the spring pocket and the energy storage spring Seat is fixedly connected, and the reset spring is connected between the spring pocket and the ratchet, and the reset spring enables the ratchet With the trend mobile towards the spring pocket, be provided with the trapezoidal external screw thread of non-self-lock-ing on the ratchet, it is described it is externally threaded in The direction relatively moved between heart line and the spring pocket and the ratchet is parallel, it is described park be provided on piston with it is described non- The internal screw thread that self-locking trapezoidal external screw thread matches, the piston of parking are spirally connected and the ratchet, it is described park piston and it is described before Lid is slidably connected, and described to park the direction that piston is slided relative to the front cover parallel with the externally threaded centerline direction.

2. drive mechanism according to claim 1, which is characterized in that the ratchet is provided with the first convex block and through-hole, institute The first convex block is stated to be located in the through-hole, and first convex block around the through-hole axial line in a ring, the ratchet assembly It further include spring base and retaining ring, the retaining ring is installed on the ratchet, and the retaining ring is located in the through-hole, the retaining ring and institute State through-hole coaxial arrangement, in a ring, and the spring base is between the reset spring and the retaining ring, institute for the spring base Stating reset spring enables the spring base be connected to the retaining ring.

3. drive mechanism according to claim 2, which is characterized in that the second convex block is provided on the spring pocket, it is described Second convex block is located at one end of the spring pocket, and second convex block projects radially outward the spring along the spring pocket Set, one end that the spring pocket is provided with second convex block are arranged towards first convex block, and the reset spring is sheathed on The spring pocket, one end of the reset spring are connected to the spring base, and the other end of the reset spring is connected to described Second convex block.

4. drive mechanism according to claim 3, which is characterized in that the outer diameter of the second convex block is less than the interior of the ratchet Diameter, and the outer diameter of second convex block is greater than the internal diameter of first convex block.

5. drive mechanism according to claim 3, which is characterized in that the spring pocket is close to one end of second convex block Internal diameter be greater than the spring pocket other end internal diameter.

6. drive mechanism according to claim 3, which is characterized in that the length of the spring pocket is greater than first convex block The distance between described retaining ring.

7. drive mechanism according to claim 6, which is characterized in that multiple card slots are provided on the ratchet, it is multiple The card slot is arranged around the axial line interval of the through-hole, and one end of the card slot extends to the end face of the ratchet, and described Card slot is located at the one end of the ratchet far from the spring pocket.

8. drive mechanism according to claim 7, which is characterized in that the card slot includes two side walls, a side Wall passes through the axial line of the ratchet, another described sidewall slope setting, enable the width of the card slot along its be recessed direction by It is decrescence small.

9. drive mechanism according to claim 1, which is characterized in that the drive mechanism further includes limit sleeve, the limit Piston is parked described in being sheathed in position, and the limit sleeve is located at described park between piston and the accumulation of energy spring abutment.

10. a kind of drive mechanism, which is characterized in that described including parking piston, accumulation of energy spring abutment, block, ratchet assembly and front cover Block is connected in the front cover, and the accumulation of energy spring abutment is bolted in the front cover, and the energy storage spring seat is located at the block and described Between ratchet assembly, the ratchet assembly includes ratchet, reset spring and spring pocket, and the spring pocket and the accumulation of energy spring abutment are solid Fixed connection, the reset spring are connected between the spring pocket and the ratchet, and the reset spring enables the ratchet have Towards the trend of spring pocket movement, the trapezoidal external screw thread of non-self-lock-ing, the externally threaded center line are provided on the ratchet The direction relatively moved between the spring pocket and the ratchet is parallel, and described park is provided with and the non-self-lock-ing on piston The internal screw thread that trapezoidal external screw thread matches, the piston of parking are spirally connected and the ratchet, and the piston of parking is slided with the front cover Dynamic connection, described to park the direction that piston is slided relative to the front cover parallel with the externally threaded centerline direction.