CN214741534U

CN214741534U - Pressure reducing mechanism for camshaft of gasoline engine

Info

Publication number: CN214741534U
Application number: CN202121332305.4U
Authority: CN
Inventors: 王一维; 苏尚
Original assignee: Changzhou Fuji Changchai Robin Gasoline Engine Co ltd
Current assignee: Changzhou Fuji Changchai Robin Gasoline Engine Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-11-16
Anticipated expiration: 2031-06-15

Abstract

The utility model belongs to the general gasoline engine field, in particular to a gasoline engine camshaft pressure reducing mechanism, which comprises a driven gear which is integrated with a camshaft or formed in a split way, a through hole is arranged on the driven gear, a notch is arranged at the base circle of a cam of the camshaft close to the driven gear, a pressure reducing shaft is arranged in the through hole, one end of the pressure reducing shaft is provided with a centrifugal rotary reset mechanism, the other end of the pressure reducing shaft is processed with a D-shaped section, the D-shaped section end of the pressure reducing shaft extends into the notch, when the centrifugal rotary reset mechanism is in an initial state, the D-shaped section end of the pressure reducing shaft is higher than the cam surface of the camshaft, when the centrifugal rotary reset mechanism is acted by centrifugal force, the D-shaped section end of the pressure reducing shaft is lower than or flush with the cam surface of the camshaft, the utility model designs a pressure reducing mechanism which drives the camshaft by converting the centrifugal force generated by the rotary motion of the camshaft into rotary force, the defects of linear motion of the sliding block in the prior art are overcome.

Description

Pressure reducing mechanism for camshaft of gasoline engine

Technical Field

The utility model belongs to general gasoline engine field, in particular to gasoline engine camshaft decompression mechanism.

Background

In order to make the starting of the general gasoline engine smoother, a device for reducing the cylinder pressure when the general gasoline engine is started is generally arranged on the general gasoline engine so as to ensure the smooth starting of the general gasoline engine. The device for reducing the pressure of the cylinder when the universal gasoline engine is started at present mainly adopts the technical scheme that a timing driven gear connected with a cam shaft is provided with a sliding block capable of sliding and moving, the sliding block is provided with two strip-shaped holes which are in sliding fit with two rivets arranged on the diameter of the timing driven gear, an opening enabling the cam shaft to be located in the opening is arranged between the two strip-shaped holes, a shifting fork arranged on the sliding block is connected with a crank throw connected onto the cam shaft through a pin shaft, the track of a working surface of the crank throw is a curve, and the working surface faces the lower end of a top column of a gas distribution mechanism. When the device works, the shifting fork drives the crank throw to rotate around the pin shaft through the displacement of the sliding block, so that the curve working surface of the crank throw is in contact with the ejection column to limit the position of the ejection column, the pressure of the cylinder is reduced, and the universal gasoline engine is smoothly started.

The exhaust tappet is not contacted with the base circular surface of a cam through a sliding block in the prior art, the structure has the following defects that 1, the sliding block needs to slide on a cam shaft, the sliding linear motion process of the sliding block is possibly blocked, and the exhaust tappet cannot be jacked, 2, the rotating acting force of a centrifugal block is converted into the linear motion force of the sliding block through the rotation of the cam shaft, and the phenomenon that the centrifugal block and the sliding block are blocked easily occurs in the conversion process.

Disclosure of Invention

The utility model discloses to prior art's is not enough, designs one kind and changes the centrifugal force that the rotary motion produced through with the camshaft into the revolving force and drive gasoline engine camshaft decompression mechanism, simple structure, and the decompression effect is reliable and stable, has overcome a great deal of not enough that slider linear motion exists among the prior art.

The technical scheme of the utility model as follows:

gasoline engine camshaft decompression mechanism, it includes the driven gear who becomes with camshaft an organic whole or components of a whole that can function independently, its characterized in that: be equipped with the perforating hole on the driven gear, and the base circle department of the cam of the camshaft that is close to driven gear is equipped with a breach, still including setting up the axle of decompression in the perforating hole, the one end of axle of decompression is equipped with centrifugal rotatory canceling release mechanical system, the other end processing of axle of decompression has D type cross-section, the D type cross-section end of axle of decompression stretches into in the breach, when centrifugal rotatory canceling release mechanical system is in initial condition, the D type cross-section end of axle of decompression is higher than the cam surface of camshaft, centrifugal rotatory canceling release mechanical system is when centrifugal force is used, the D type cross-section end of axle of decompression is less than or the cam surface of parallel and level and camshaft.

Further, the centrifugal rotation reset mechanism comprises a rotation swing arm which is integrated with the decompression shaft or formed in a split mode, and a reset elastic mechanism arranged on the surface of the driven gear, wherein when no centrifugal force acts, the reset elastic mechanism drives the rotation swing arm to be in an initial state.

Furthermore, the surface of the driven gear is also provided with a limiting assembly for limiting the swing angle of the centrifugal rotation resetting mechanism.

Furthermore, the limiting mechanism comprises a limiting hole arranged on the driven gear and a limiting rod fixed in the limiting hole.

Furthermore, the limiting rod is hollow and provided with gaps on the circumferential surface.

Furthermore, the elastic reset mechanism comprises a reset screw fixed on the driven gear and a reset spring sleeved on the reset screw, one end of the reset spring is abutted against the shaft body, and the other end of the reset spring is abutted against the rotary swing arm.

Furthermore, the rotary swing arm is a linear swing rod.

Furthermore, the rotary swing arm is a U-shaped rotary swing arm.

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

the utility model discloses a rotation of camshaft drives centrifugal rotatory canceling release mechanical system and takes place rotatoryly, rotatory in-process takes place rotatoryly through driving the decompression axle, the decompression axle takes place rotatory back, wherein the plane in the D type cross-section of one end will be less than or the parallel and level in the cam surface of camshaft, after equipment stop work, the centrifugal force of the rotatory production of camshaft disappears, centrifugal rotatory canceling release mechanical system resets this moment, the decompression axle resets, the circular arc position in the D type cross-section after resetting is higher than the cam surface of camshaft, support the exhaust tappet, make there is a clearance between exhaust tappet and the camshaft surface, thereby can not lead to recoil or reversal because of the increase of in-cylinder pressure when the gasoline engine starts the initialization.

Drawings

Fig. 1 is a schematic structural diagram of the present invention in an initial state;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural view of the present invention under the action of centrifugal force;

fig. 4 is a schematic structural view of the rotary swing arm of another structure of the present invention;

FIG. 5 is a schematic view of the D-section end being above the cam base circle of the camshaft;

FIG. 6 is a schematic view of a D-section below or flush with the cam base circle of the camshaft;

in the figure, 1 is a camshaft, 10 is a driven gear, 11 is a through hole, 100 is a notch, 12 is a decompression shaft, 13 is a centrifugal rotary reset mechanism, 14 is a D-shaped section, 130 is a rotary swing arm, 131 is a reset elastic mechanism, 15 is a limit component, 150 is a limit hole, 151 is a limit rod, 1310 is a reset screw, and 1311 is a reset spring.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

Referring to fig. 1 to 6, a camshaft pressure reducing mechanism of a gasoline engine, which includes a driven gear 10 formed integrally or separately with a camshaft 1, is characterized in that: be equipped with perforating hole 11 on driven gear 10, and be close to driven gear's camshaft 1's base circle department and be equipped with a breach 100, still including setting up decompression axle 12 in the perforating hole, the one end of decompression axle 12 is equipped with centrifugal rotatory canceling release mechanical system 13, the other end processing of decompression axle 12 has D type cross-section 14, the D type cross-section end of decompression axle 12 stretches into in the breach, when centrifugal rotatory canceling release mechanical system 13 was in initial condition, the D type cross-section end of decompression axle is higher than the cam surface of camshaft, centrifugal rotatory canceling release mechanical system was when centrifugal force was used, the D type cross-section end of decompression axle was less than or the cam surface of parallel and level and camshaft.

The utility model discloses a rotary motion through rotatory canceling release mechanical system of centrifugation drives the rotation of decompression axle to the realization is under the gasoline engine off state, and the D type cross-section of decompression axle is higher than the cam surface of camshaft, makes to have a clearance between exhaust tappet and the cam surface, thereby can not lead to recoil or reversal because of the increase of in-cylinder pressure when the gasoline engine starts initially, has overcome the slider of linear motion form among the prior art and has had the dead problem of card easily.

Further, the centrifugal rotation reset mechanism 13 includes a rotation swing arm 130 formed integrally or separately with the pressure reducing shaft, in this embodiment, the rotation swing arm is preferably formed integrally with one end of the pressure reducing shaft, so as to ensure the structural stability of the two, reduce the processing of the connection structure, and have better precision and simpler and more reliable structure, and further includes a reset elastic mechanism 131 disposed on the surface of the driven gear, when there is no centrifugal force, the reset elastic mechanism drives the rotation swing arm to be in an initial state, the centrifugal rotation reset mechanism utilizes the centrifugal force generated by the rotation of the camshaft, the centrifugal force overcomes the pulling force or the pushing force of the reset elastic mechanism, so that the rotation swing arm rotates around the pressure reducing shaft, thereby driving the pressure reducing shaft to rotate, in the stop state of the gasoline engine, the centrifugal force generated by the rotation of the camshaft disappears, at this time, the pulling force or the pushing force of the reset elastic mechanism makes the rotation swing arm be in the initial state, in the initial state, the D-section end of the decompression shaft is higher than the cam surface of the camshaft, so that a gap exists between the exhaust lifter and the cam surface.

Furthermore, the surface of the driven gear 11 is further provided with a limiting assembly 15 for limiting the swing angle of the centrifugal rotation resetting mechanism, the limiting assembly is arranged for limiting the rotation angle of the decompression shaft, and after the decompression shaft rotates by an overlarge angle, the D-shaped section of the decompression shaft is higher than the cam surface of the cam shaft, so that the rotation angle of the decompression shaft needs to be limited, and the normal pressure in the cylinder when the gasoline engine works is ensured.

Further, the limiting mechanism 15 includes a limiting hole 150 formed on the driven gear, and a limiting rod 151 fixed in the limiting hole.

Furthermore, the limiting rod 151 is a hollow limiting rod with a gap on the circumferential surface, and the hollow limiting rod with the gap on the circumferential surface has certain elasticity and a buffering function, so that the problem that the rotating swing arm is contacted with the rotating swing arm under the action of centrifugal force and possibly generates collision and rebound is avoided.

Further, the elastic reset mechanism 131 includes a reset screw 1310 fixed on the driven gear, and a reset spring 1311 sleeved on the reset screw, one end of the reset spring abuts against the shaft body, and the other end of the reset spring abuts against the rotary swing arm.

Further, referring to fig. 4, the rotating swing arm 130 is a linear swing arm.

Further, referring to fig. 1-3, the rotating swing arm 130 is a U-shaped rotating swing arm.

The rotary swing arms with two different structures are provided, and selection is carried out according to actual requirements.

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

Claims

1. Gasoline engine camshaft decompression mechanism, it includes the driven gear who becomes with camshaft an organic whole or components of a whole that can function independently, its characterized in that: be equipped with the perforating hole on the driven gear, and the base circle department of the cam of the camshaft that is close to driven gear is equipped with a breach, still including setting up the axle of decompression in the perforating hole, the one end of axle of decompression is equipped with centrifugal rotatory canceling release mechanical system, the other end processing of axle of decompression has D type cross-section, the D type cross-section end of axle of decompression stretches into in the breach, when centrifugal rotatory canceling release mechanical system is in initial condition, the D type cross-section end of axle of decompression is higher than the cam surface of camshaft, centrifugal rotatory canceling release mechanical system is when centrifugal force is used, the D type cross-section end of axle of decompression is less than or the cam surface of parallel and level and camshaft.

2. The camshaft pressure reducing mechanism for a gasoline engine as defined in claim 1, wherein: the centrifugal rotary reset mechanism comprises a rotary swing arm integrated with the decompression shaft or formed in a split mode, and further comprises a reset elastic mechanism arranged on the surface of the driven gear, and when the centrifugal force does not act, the reset elastic mechanism drives the rotary swing arm to be in an initial state.

3. The camshaft pressure reducing mechanism for a gasoline engine according to claim 1 or 2, wherein: and the surface of the driven gear is also provided with a limiting assembly for limiting the swing angle of the centrifugal rotation resetting mechanism.

4. The camshaft pressure reducing mechanism for a gasoline engine as defined in claim 3, wherein: the limiting assembly comprises a limiting hole formed in the driven gear and a limiting rod fixed in the limiting hole.

5. The camshaft pressure reducing mechanism for a gasoline engine as claimed in claim 4, wherein; the limiting rod is hollow and is provided with gaps on the circumferential surface.

6. The camshaft pressure reducing mechanism for a gasoline engine as defined in claim 2, wherein: the reset elastic mechanism comprises a reset screw fixed on the driven gear and a reset spring sleeved on the reset screw, one end of the reset spring is abutted against the shaft body, and the other end of the reset spring is abutted against the rotary swing arm.

7. The camshaft pressure reducing mechanism for a gasoline engine as defined in claim 2, wherein: the rotary swing arm is a linear swing rod.

8. The camshaft pressure reducing mechanism for a gasoline engine as defined in claim 2, wherein: the rotary swing arm is a U-shaped rotary swing arm.