CN214035815U

CN214035815U - Camshaft structure for air-cooled diesel engine

Info

Publication number: CN214035815U
Application number: CN202022822531.2U
Authority: CN
Inventors: 何代义; 龚仲飞
Original assignee: Cixi Prospect Drive Equipment Co ltd
Current assignee: Cixi Prospect Drive Equipment Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-08-24
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a camshaft structure for air-cooled diesel engine, including the camshaft body, the flyweight support is installed to the camshaft body, is provided with timing gear outside the flyweight support, and it is fixed all through the key-type connection between flyweight support and the camshaft body, between flyweight support and the timing gear. The utility model has the advantages of it is following and effect: the new mechanical structure of this scheme utilization adopts between flyweight support and the camshaft body, all through the mode of key-type connection between flyweight support and the timing gear, compares in prior art and adopts countersunk screw fixed's mode, does not receive the restriction of size, so, the qualification rate of assembly is higher, and the stability of connecting after the installation is higher.

Description

Camshaft structure for air-cooled diesel engine

Technical Field

The utility model relates to a camshaft technical field, in particular to a camshaft structure for air-cooled diesel engine.

Background

The camshaft is an indispensable part for the operation of the engine, is the guarantee of the normal work of the engine, and in order to obtain better fuel economy and emission indexes, along with the application of the electric control pump on a small diesel engine, the high pressure of the pump end of the engine oil pump is gradually increased, and the camshaft has new requirements on the rigidity of the engine camshaft.

The existing camshaft assembly is shown in attached figures 1 and 2, and comprises a camshaft body 1 ', a timing gear 2 ' arranged on the camshaft body 1 ', a flyweight bracket 5 ' fixedly connected with the outer end surface of the timing gear 2 ' through a sunk screw 3 ' in a matching way with a locknut 4 ', the flyweight bracket 5 ' punched by a 2mm steel plate, three flyweights 6 ' rotatably connected on the flyweight bracket 5 ' through flyweight pins 8 ', embedded grooves 61 ' formed on the flyweights 6 ', a sliding sleeve 7 ' further slidably sleeved on the camshaft body 1 ', one end of the sliding sleeve 7 ' embedded in the embedded groove 61 ', when a diesel engine runs, the camshaft body rotates at high speed to generate centrifugal force, so that the flyweights outwards turn around the flyweight pins and push the sliding sleeve to move rightwards along the camshaft, and the amount of the diesel engine is reduced through a speed regulating lever (not shown in the figure) tightly attached to the right end surface of the sliding sleeve, when the rotating speed of the diesel engine is too low, the centrifugal force of the flyweight is reduced, the sliding sleeve slides leftwards, and meanwhile, the oil supply of the diesel engine is increased under the action of the tension spring by the speed regulating lever. Therefore, the swing angle of the 3 flyweights, the flexibility of the flyweights, the rigidity of the flyweight bracket and the like at the same time directly influence the fluctuation of the rotating speed of the diesel engine.

The camshaft assembly described above, however, suffers from the following disadvantages: 1. because of the influence of the overall structural layout of the diesel engine, the steel plate of the flyweight bracket cannot be too thick, so that the rigidity of the flyweight bracket is influenced; 2. the flyweight support is arranged on a camshaft timing gear by adopting 3 countersunk head screws and locknuts, so that the phenomenon that the flyweight support is loosened and knocked to damage a diesel engine often occurs, and the flyweight support is arranged on the diesel engine to cause unstable rotating speed of the diesel engine and high proportion of traveling vehicles; 3. due to the integral structure of the diesel engine, the height of the countersunk head of the screw, which is higher than the left end face of the camshaft timing gear, must be less than 0.5mm, the depth of the countersunk hole of the flyweight support, the depth of the concave surface of the camshaft timing gear and the height of the head of the screw all influence the size, the precision control is strict, and the problem of high rework rate during assembly exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a camshaft structure for forced air cooling diesel engine, have the higher effect of stability and qualification rate to prior art exists not enough.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a camshaft structure for air-cooled diesel engine, includes the camshaft body, and the flyweight support is installed to the camshaft body, is provided with timing gear outside the flyweight support, all fixes through the key-type connection between flyweight support and the camshaft body, between flyweight support and the timing gear.

Through adopting above-mentioned technical scheme, when the installation, with on the flyweight support is fixed in the camshaft body through the key-type connection installation, timing gear passes through the key-type connection installation and is fixed in on the flyweight support, when the camshaft body rotates, can drive timing gear through the flyweight support and rotate, compare in the mode that adopts countersunk screw fixed among the prior art, do not receive the restriction of size, so, the qualification rate of assembly is higher, and the stability of connecting after the installation is higher.

The present invention may be further configured in a preferred embodiment as: the centre bore that supplies the camshaft body to pass is seted up at the center of flyweight support, and first keyway has been seted up to the inner wall of centre bore, and the lateral wall of camshaft body is provided with first flat key, first flat key and the cooperation of first keyway embedding.

Through adopting above-mentioned technical scheme, when flying hammer support fixed mounting on the camshaft body, correspond first keyway to first flat key, insert the tip of camshaft body in the centre bore correspondingly, first keyway and the interference fit of pegging graft of first flat key can accomplish the installation.

The present invention may be further configured in a preferred embodiment as: the outer wall of the flyweight support is provided with a second flat key, a mounting hole is formed in the center of the timing gear, a second key groove is correspondingly formed in the inner wall of the mounting hole, and the second flat key is matched with the second key groove in an embedded mode.

By adopting the technical scheme, when the timing gear is installed on the flyweight support, the second key groove corresponds to the second flat key, the timing gear is correspondingly sleeved outside the flyweight support, and the second key groove and the second flat key are in inserted interference fit to complete installation.

The present invention may be further configured in a preferred embodiment as: the flyweight support is provided with a plurality of flyweights, the flyweights are rotatably connected to the flyweight support through flyweight pins, the flyweight support is provided with a plurality of pin holes for the insertion of the flyweight pins, and the flyweights are provided with grooves; the cover is equipped with and pushes away the dish on the camshaft body, pushes away the axial setting of sliding of dish along the camshaft body, pushes away the dish including extending the dish, extends the dish and stretches into in the recess.

Through adopting above-mentioned technical scheme, when the camshaft body drives the flyweight support and rotates, the outside periphery upset of flyweight under the effect of centrifugal force, because extend the dish and stretch into the recess, the recess can drive and push away the whole right removal along the axial of dish, and when camshaft body rotational speed reduced, the angle of the outside upset of flyweight reduced to make and push away the distance that the dish moved right relatively and reduce.

The present invention may be further configured in a preferred embodiment as: the flyweights are three, the three flyweights are distributed around the push disc at equal intervals, and the included angle between every two adjacent flyweights is 120 degrees.

The present invention may be further configured in a preferred embodiment as: the side wall of the flyweight support is provided with a plurality of through holes, the through holes correspond to the pin holes one to one, and the through holes and the pin holes are coaxially arranged.

By adopting the technical scheme, the arrangement of the through hole is convenient for correspondingly inserting the flyweight pin into the pin hole.

The present invention may be further configured in a preferred embodiment as: the camshaft body is provided with an elastic check ring for a shaft, and the elastic check ring for the shaft is in limit fit with the flyweight support.

Through adopting above-mentioned technical scheme, can restrict the mounted position of flyweight support for the camshaft pump head through circlip for the axle.

The present invention may be further configured in a preferred embodiment as: still be provided with the steel wire retaining ring on the camshaft body, steel wire retaining ring and the spacing cooperation of pushing disk.

Through adopting above-mentioned technical scheme, can restrict the position that the relative camshaft body of push pedal slided along the axial through the steel wire retaining ring, prevent that the push pedal from sliding too far and breaking away from the recess of flyweight.

The present invention may be further configured in a preferred embodiment as: a plurality of supporting convex ribs are arranged between the side wall of the flyweight support and the end surface of the flyweight support.

Through adopting above-mentioned technical scheme, support protruding muscle can strengthen the structural strength between flyweight support lateral wall and the terminal surface to a certain extent, prevent that flyweight support from taking place deformation.

To sum up, the utility model discloses following beneficial effect has:

1. the flyweight support and the camshaft body and the flyweight support and the timing gear are connected through keys, and compared with a mode of fixing by using a countersunk head screw in the prior art, the flyweight support is not limited by size, so that the assembly qualification rate is high, and the connection stability after installation is high;

2. the adoption of the mode that the side wall of the flyweight support is provided with a plurality of through holes coaxial with the pin holes can facilitate the corresponding insertion of the flyweight pin in the pin hole.

Drawings

Fig. 1 is a schematic diagram of the overall structure relationship of the prior art.

Fig. 2 is an exploded view of the prior art.

Fig. 3 is a schematic diagram of the overall structural relationship of the embodiment.

Fig. 4 is a sectional view of a part of the embodiment to which the flyweight holder is attached.

Fig. 5 is an exploded view of the embodiment.

Fig. 6 is a schematic structural relationship diagram of the flyweight holder of the embodiment.

Reference numerals: 1', a camshaft body; 2', a timing gear; 3', countersunk head screw; 4', a locknut; 5', a flyweight support; 6', a flyweight; 61', a recessed groove; 7', a sliding sleeve; 8', a flyweight pin; 1. a camshaft body; 11. a first flat key; 2. a timing gear; 21. mounting holes; 22. a second keyway; 3. a flyweight support; 31. a central bore; 32. a first keyway; 33. a second flat key; 34. a pin hole; 35. a through hole; 36. supporting the convex ribs; 4. flying hammers; 41. a flyweight pin; 42. a groove; 5. pushing the disc; 51. an extension tray; 6. a circlip for the shaft; 7. a steel wire retainer ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A camshaft structure for an air-cooled diesel engine comprises a camshaft body 1, a timing gear 2 is installed at one end of the camshaft body 1, a mounting hole 21 is formed in the center of the timing gear 2, a flyweight support 3 is arranged in the mounting hole 21, and the flyweight support 3 is connected with the camshaft body 1 and the flyweight support 3 is connected with the timing gear 2 through keys.

As shown in fig. 5, a center hole 31 through which the camshaft body 1 passes is formed in the center of the flyweight support 3, a first key groove 32 is formed in the inner wall of the center hole 31, a first flat key 11 is arranged on the side wall of the camshaft body 1, and the first flat key 11 and the first key groove 32 are in interference fit. The outer wall of flyweight support 3 is provided with second flat key 33, and the inner wall of mounting hole 21 has seted up second keyway 22 correspondingly, and second flat key 33 and second keyway 22 embedding interference fit.

When flyweight support 3 fixed mounting is on camshaft body 1, correspond first keyway 32 to first flat key 11, insert camshaft body 1's tip in the centre bore 31 correspondingly, first keyway 32 and first flat key 11 grafting interference fit can accomplish the installation. When the timing gear 2 is installed on the flyweight support 3, the second key groove 22 corresponds to the second flat key 33, the timing gear 2 is correspondingly sleeved outside the flyweight support 3, and the second key groove 22 and the second flat key 33 are in inserted interference fit to complete installation.

As shown in fig. 5 and 6, the flyweight support 3 is provided with three flyweights 4, the three flyweights 4 are distributed around the push plate 5 at equal intervals, and the included angle between adjacent flyweights 4 is set to be 120 °. The flyweight 4 is rotatably connected to the flyweight bracket 3 through a flyweight pin 41, the flyweight bracket 3 is provided with a plurality of pin holes 34 for the insertion of the flyweight pin 41, and the flyweight 4 is provided with a groove 42; the cover is equipped with and pushes away dish 5 on the camshaft body 1, pushes away dish 5 along the axial setting of sliding of camshaft body 1, pushes away dish 5 including setting up the extension dish 51 at the left end, extends dish 51 and stretches into in recess 42. The side wall of the flyweight support 3 is provided with a plurality of through holes 35, the through holes 35 correspond to the pin holes 34 one by one, the through holes 35 are coaxially arranged with the pin holes 34, and the through holes 35 are convenient for inserting the flyweight pins 41 into the pin holes 34 correspondingly. A plurality of supporting convex ribs 36 are arranged between the side wall of the flyweight support 3 and the end face of the flyweight support 3, and the supporting convex ribs 36 can enhance the structural strength between the side wall and the end face of the flyweight support 3 to a certain extent and prevent the flyweight support 3 from deforming.

As shown in fig. 5, the camshaft body 1 is provided with a shaft circlip 6, the shaft circlip 6 is in limit fit with the flyweight bracket 3, the camshaft body 1 is further provided with a steel wire circlip 7, and the steel wire circlip 7 is in limit fit with the push disc 5. The mounting position of the flyweight holder 3 to the camshaft body 1 can be restricted by the shaft circlip 6, and the position of the push disk 5 that slides in the axial direction with respect to the camshaft body 1 can be restricted by the wire circlip 7, thereby preventing the push disk 5 from sliding too far and separating from the groove 42 of the flyweight 4.

The utility model discloses a basic operating principle does: when the flyweight support 3 is installed and fixed on the camshaft body 1 through key connection, the timing gear 2 is installed and fixed on the flyweight support 3 through key connection, when the camshaft body 1 rotates, the timing gear 2 can be driven to rotate through the flyweight support 3, when the camshaft body 1 drives the flyweight support 3 to rotate, the flyweight 4 overturns towards the outer periphery under the action of centrifugal force, as the extension disc 51 extends into the groove 42, the groove 42 can drive the whole push disc 5 to move towards the right along the axial direction, when the rotating speed of the camshaft body 1 is reduced, the outward overturning angle of the flyweight 4 is reduced, and therefore the distance of the push disc 5 moving towards the right relatively is reduced. Compared with the mode of fixing by using countersunk head screws in the prior art, the method is not limited by the size, so that the installation is quick and convenient in the assembling process, the qualified rate of the assembly is high, the stability of the connection is high after the installation, and the looseness is not easy to occur.

The camshaft is mainly applied to 290F or 292F diesel engines.

The specific embodiments are only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a camshaft structure for air-cooled diesel engine, includes camshaft body (1), its characterized in that: the flyweight support (3) is installed on the camshaft body (1), a timing gear (2) is arranged outside the flyweight support (3), and the flyweight support (3) is fixedly connected with the camshaft body (1) and the flyweight support (3) is fixedly connected with the timing gear (2) through keys.

2. The camshaft structure for an air-cooled diesel engine as set forth in claim 1, wherein: the center of flyweight support (3) is seted up and is supplied centre bore (31) that camshaft body (1) passed, first keyway (32) have been seted up to the inner wall of centre bore (31), the lateral wall of camshaft body (1) is provided with first flat key (11), first flat key (11) with first keyway (32) embedding cooperation.

3. The camshaft structure for an air-cooled diesel engine as set forth in claim 1, wherein: the outer wall of the flyweight support (3) is provided with a second flat key (33), the center of the timing gear (2) is provided with a mounting hole (21), the inner wall of the mounting hole (21) is correspondingly provided with a second key groove (22), and the second flat key (33) is matched with the second key groove (22) in an embedded mode.

4. The camshaft structure for an air-cooled diesel engine as set forth in claim 1, wherein: the flyweight support (3) is provided with a plurality of flyweights (4), the flyweights (4) are rotatably connected to the flyweight support (3) through flyweight pins (41), the flyweight support (3) is provided with a plurality of pin holes (34) for the insertion of the flyweight pins (41), and the flyweights (4) are provided with grooves (42); the camshaft is characterized in that a push disc (5) is sleeved on the camshaft body (1), the push disc (5) is arranged in a sliding mode in the axial direction of the camshaft body (1), the push disc (5) comprises an extension disc (51), and the extension disc (51) extends into the groove (42).

5. The camshaft structure for an air-cooled diesel engine as set forth in claim 4, wherein: the number of the flyweights (4) is three, the flyweights (4) are distributed around the push disc (5) at equal intervals, and the included angle between every two adjacent flyweights (4) is set to be 120 degrees.

6. The camshaft structure for an air-cooled diesel engine as set forth in claim 4, wherein: a plurality of through holes (35) are formed in the side wall of the flyweight support (3), the through holes (35) correspond to the pin holes (34) one to one, and the through holes (35) and the pin holes (34) are coaxially arranged.

7. The camshaft structure for an air-cooled diesel engine as set forth in claim 1, wherein: the camshaft is characterized in that an elastic check ring (6) for a shaft is arranged on the camshaft body (1), and the elastic check ring (6) for the shaft is in limit fit with the flyweight support (3).

8. The camshaft structure for an air-cooled diesel engine as set forth in claim 4, wherein: the camshaft is characterized in that a steel wire retainer ring (7) is further arranged on the camshaft body (1), and the steel wire retainer ring (7) is in limit fit with the push disc (5).

9. The camshaft structure for an air-cooled diesel engine as set forth in claim 1, wherein: a plurality of supporting convex ribs (36) are arranged between the side wall of the flyweight support (3) and the end surface of the flyweight support (3).