CN112523828A

CN112523828A - Oil-gas separation structure of camshaft assembly

Info

Publication number: CN112523828A
Application number: CN202011495423.7A
Authority: CN
Inventors: 蔡良正; 郑林; 张立成; 程雪君; 郑海刚; 颜阳益
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-03-19

Abstract

The invention provides an oil-gas separation structure of a camshaft assembly, and belongs to the technical field of engines. It has solved the inconvenient problem of current oil-gas separation structure processing. This camshaft subassembly's oil-gas separation structure includes that the oil-gas channel and the crank that run through along the camshaft axial in the camshaft connect, have on the lateral wall of crank joint inlet end to be the separation sand grip that the spiral set up along the camshaft axial, and the inlet end that the crank connects is worn to establish in the gas outlet of oil-gas channel, forms between the inner wall of oil-gas channel, the lateral wall that the crank connects and the separation sand grip to supply that machine oil passes through to be spiral separation oil duct. This camshaft assembly's oil-gas separation structure has the convenient advantage of processing.

Description

Oil-gas separation structure of camshaft assembly

Technical Field

The invention belongs to the technical field of engines, relates to a camshaft assembly, and particularly relates to an oil-gas separation structure of the camshaft assembly.

Background

When the engine works, part of combustible oil-gas mixture containing engine oil and waste gas can enter the crankcase through the piston ring, so that the pressure of the crankcase is increased, the stability of an engine system is threatened, an oil-gas separation device is required to be arranged in the engine system, the oil-gas separation device mainly has the function of extracting the oil-gas mixture from the crankcase, oil and gas separation is carried out by using a specific method, the separated gas enters the cylinder again for combustion or is discharged, and the separated oil returns to the oil pan again for reuse.

In order to realize oil-gas separation, people improve the structure of the traditional camshaft, and some have applied for patents, for example, chinese patent literature discloses a camshaft, a camshaft assembly and an engine system [ patent No.: 201621455679.4, respectively; authorization notice number: CN206299419U ], the camshaft has a cylindrical cavity extending along the axial direction of the camshaft, and the cavity wall of the cavity is provided with a spiral guide groove for agglutinating engine oil and an oil drainage hole for discharging engine oil, which penetrates through the cavity wall.

The camshaft of this kind of structure utilizes the density difference of machine oil and air in the oil-gas mixture, and when the oil-gas mixture was rotatory air current along the camshaft, the machine oil adhesion was discharged through the draining hole on the chamber wall of cavity and after flowing along the guiding gutter, and gas is discharged from the bleed valve. However, the camshaft with the structure is long in length, a diversion groove needs to be formed in the cavity wall of the cavity, an oil drainage hole needs to be drilled in the camshaft, machining is troublesome, and manufacturing cost is increased. Meanwhile, due to the arrangement of the oil drainage hole, although gas in the camshaft cavity basically cannot overflow through the oil drainage hole, the gas cannot overflow from the oil drainage hole, and the oil-gas separation efficiency is lowered.

Disclosure of Invention

The invention aims to provide an oil-gas separation structure of a camshaft assembly aiming at the problems in the prior art, and solves the technical problem of how to facilitate the processing of the oil-gas separation structure.

The purpose of the invention can be realized by the following technical scheme: the utility model provides an oil-gas separation structure of camshaft subassembly, includes the oil-gas channel that runs through along the camshaft axial in the camshaft, its characterized in that, oil-gas separation structure still includes the crank joint, the separation sand grip that is spiral setting along the camshaft axial has on the lateral wall of crank joint inlet end, the inlet end that the crank connects is worn to establish in the gas outlet of oil-gas channel, it is spiral shape separation oil duct to form between the inner wall of oil-gas channel, the lateral wall that the crank connects and the separation sand grip and is supplied machine oil to pass through.

Because the density of machine oil is greater than gaseous density, when engine work camshaft is rotatory, under the effect of centrifugal force, machine oil can be got rid of on the inner wall of oil gas passageway, waste gas flows towards the crank joint along the oil gas passageway, waste gas flows and can promote the inner wall that machine oil pasted the oil gas passageway and move to the gas outlet of oil gas passageway, waste gas passes through the crank joint and discharges, machine oil is removed along the separation oil duct and is retrieved the reuse by the discharge, realize oil-gas separation, the crank joint links firmly with the crankcase mutually. Because the separation sand grip is the spiral, makes the separation oil duct be the spiral, makes machine oil be the spiral and moves forward when the camshaft is rotatory, and machine oil can be better under the effect of centrifugal force be discharged, and simultaneously, the separation sand grip is the spiral arch, and the separation sand grip is mutually perpendicular with the flow direction of waste gas, and the separation sand grip can effectually block waste gas, makes inside waste gas can not enter into the engine through the separation oil duct once more, makes oil-gas separation thorough. This oil-gas separation structure sets up the separation sand grip on the lateral wall that the cranking connects, realizes oil-gas separation, for set up the guiding gutter on the inner wall at camshaft oil gas passageway and drill out the draining hole, processing is convenient, reduce cost.

In the oil-gas separation structure of the camshaft assembly, one section of the inner wall of the oil-gas channel is a necking section which is annularly and inwards protruded, and the joint of two ends of the necking section and the inner wall of the oil-gas channel is arc-shaped. The flow area of the oil-gas channel at the necking section is reduced, so that the flow speed of waste gas is increased, the flow area is increased suddenly when the waste gas passes through the necking section, the waste gas is impacted by being emitted outwards, and the engine oil can be better pushed to the inner wall of the oil-gas channel by matching with the centrifugal force of the camshaft rotating engine oil, so that the engine oil can be better discharged from the separation oil channel for recycling, oil-gas separation is realized, and the oil-gas separation efficiency is improved; meanwhile, the joints at the two ends of the necking section are arc-shaped, so that the engine oil can better move along the inner wall of the oil-gas channel and cannot be blocked.

In the oil-gas separation structure of the camshaft assembly, the camshaft is provided with a concave section which is annularly and inwards concave, and the concave section and the necking section are correspondingly arranged. The space in the engine is limited, the concave section is arranged to improve the space, so that parts such as a cam and the like can be embedded, the space is reasonably utilized, and the structure of the engine is compact; meanwhile, the concave section of the camshaft is just the position of the necking section, and the concave section and the necking section are naturally formed only by inwards extruding the concave section of the camshaft, so that the camshaft is convenient to process.

In foretell camshaft component's oil-gas separation structure, the separation sand grip is laminated mutually with the inner wall of oil gas passageway. This kind of structure guarantees that machine oil removes along the separation oil duct, and in waste gas can not follow this reentrant engine simultaneously, oil-gas separation was thorough.

In the oil-gas separation structure of the camshaft assembly, the separation convex strip and the crank joint are of an integrated structure. Integral type structure, stability is good, and firm degree is high, through modes such as turnning and milling at surface machining separation sand grip, processing is convenient.

In the oil-gas separation structure of the camshaft assembly, the spiral direction of the separation oil passage is consistent with the rotation direction of the camshaft. The flow direction of the separation oil duct is consistent with that of the engine oil, so that the engine oil can flow more quickly, and the oil-gas separation efficiency is improved.

In the oil-gas separation structure of the camshaft assembly, the air inlet end of the crank joint and the middle part of the crank joint are provided with transition sections, and the outer diameter of the transition sections is gradually reduced along the direction from the air inlet end of the crank joint to the middle part of the crank joint. This kind of structure makes the machine oil in the oil gas passageway can not plug up, discharge that can be better, improves oil-gas separation efficiency.

In foretell camshaft assembly's oil-gas separation structure, the inlet end of camshaft has the sprocket admittedly, and oil-gas separation structure is still including linking firmly the centrifugal valve in sprocket lateral surface department, one side that the centrifugal valve is close to the sprocket has the separation piece that a plurality of protrusion set up, the separation piece is the arc, and is all the separation piece interval sets up and is the annular distribution, all the inner of separation piece encloses into the gas space, the middle department of sprocket has the gas passageway of crossing, the gas space of crossing is linked together through gas passageway and oil gas passageway. The sprocket drives the centrifugal valve and the camshaft to rotate, the centrifugal valve rotates to generate centripetal force, the separating sheet rotates to suck the oil-gas mixture, and part of the engine oil is thrown out due to the fact that the density of the engine oil is larger than that of the gas, so that first oil-gas separation is realized, and the content of the engine oil in the oil-gas mixture entering the oil-gas channel is obviously reduced; the air passing space plays a role in collecting oil-gas mixtures, and the collected oil-gas mixtures pass through the chain wheel through the air passing channel and enter the oil-gas channel through the air passing channel.

In foretell camshaft assembly's oil-gas separation structure, the protruding direction arch that sets up that has on the centrifugal valve, just the direction arch is located the middle department in gas space, the bellied lateral wall of direction is the curved spigot surface for inwards coveing, towards the sprocket direction along the centrifugal valve, the external diameter of spigot surface reduces gradually. The guide protrusion and the guide surface play a role in guiding, the flow direction of the oil-gas mixture is guided, the oil-gas mixture can better enter an oil-gas channel, oil-gas separation is better achieved, and the efficiency of oil-gas separation is improved.

In the oil-gas separation structure of the camshaft assembly, the tip end of the guide protrusion is over against the radial middle of the oil-gas channel. This kind of structure makes the direction arch placed in the middle, makes the oil gas mixture can be more balanced enter into the oil gas passageway, makes the oil gas mixture flow balance in the oil gas passageway, and flow rate is fast to improve oil-gas separation's efficiency.

Compared with the prior art, the oil-gas separation structure of the camshaft assembly provided by the invention has the following advantages:

1. this oil-gas separation structure carries out first oil-gas separation through centrifugal valve, spacer, and the separation channel between rethread cranking joint and the camshaft carries out the oil-gas separation of second time, makes oil-gas separation thoroughly, ensures that oil-gas separation effectively accomplishes.

2. This oil-gas separation structure sets up the separation sand grip through setting up on the lateral wall that the crank connects, for set up the guiding gutter on the inner wall at camshaft oil gas passageway and drill out the draining hole, processing is convenient, reduce cost.

3. The centrifugal valve, the separating sheet, the guide protrusion and the like of the oil-gas separation structure realize oil-gas separation, and simultaneously, an oil-gas mixture can better enter an oil-gas channel, so that the oil-gas separation efficiency is improved.

Drawings

Fig. 1 is an overall structural sectional view of the oil-gas separation structure of the present camshaft assembly.

FIG. 2 is a schematic view of the overall structure of the oil-gas separation structure of the camshaft assembly.

Fig. 3 is a schematic view of the overall structure of the present triton joint.

FIG. 4 is a schematic view of the overall structure of the centrifugal valve and the separator.

In the figure, 1, a camshaft; 11. a recessed section; 2. an oil gas passage; 21. a necking section; 3. a triton joint; 31. a transition section; 32. separating the convex strips; 4. separating the oil duct; 5. a sprocket; 51. a gas passage; 6. a centrifugal valve; 7. separating the sheet; 8. a gas passing space; 9. a guide projection; 91. a guide surface.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the camshaft assembly comprises a camshaft 1, a sprocket 5 and an oil-gas separation structure, wherein the oil-gas separation structure comprises an oil-gas channel 2 which penetrates through the camshaft 1 along the axial direction of the camshaft 1, a crank joint 3, a centrifugal valve 6, a separation sheet 7 and a guide protrusion 9.

As shown in fig. 3, the outer side wall of the air inlet end of the crank joint 3 is provided with a separation convex strip 32 which is spirally arranged along the axial direction of the camshaft, the separation convex strip 32 and the crank joint 3 are of an integral structure, the air inlet end of the crank joint 3 and the middle part of the crank joint 3 are provided with a transition section 31, and the outer diameter of the transition section 31 is gradually reduced along the direction from the air inlet end of the crank joint 3 to the middle part of the crank joint 3.

One section of the inner wall of the oil-gas channel 2 is a necking section 21 which is annular and arranged in an inward protruding mode, and the joint of the two ends of the necking section 21 and the inner wall of the oil-gas channel 2 is arc-shaped. The camshaft 1 has a concave section 11 which is annularly and inwards concave, and the concave section 11 is arranged corresponding to the necking section 21.

The air inlet end of the crank joint 3 is arranged in the air outlet of the oil-gas channel 2 in a penetrating mode, the separation protruding strip 32 is attached to the inner wall of the oil-gas channel 2, a spiral separation oil channel 4 for engine oil to pass through is formed among the inner wall of the oil-gas channel 2, the outer side wall of the crank joint 3 and the separation protruding strip 32, and the spiral direction of the separation oil channel 4 is consistent with the rotating direction of the camshaft 1.

The chain wheel 5 is fixedly connected to the intake end of the camshaft 1, as shown in fig. 4, in the embodiment, the side of the centrifugal valve 6 close to the chain wheel 5 is provided with eight protrudingly arranged separation sheets 7, and in actual production, the number of the separation sheets 7 can be five or twelve. The separation sheet 7 is the arc, and all separation sheets 7 interval settings just are the annular and distribute, and the inner of all separation sheets 7 encloses into air passing space 8, has the protruding direction arch 9 that sets up on the centrifugal valve 6, and the protruding 9 of direction is located air passing space 8's centre department, and the lateral wall of direction arch 9 is curved spigot surface 91 for inwards coveing, and towards sprocket 5 direction along centrifugal valve 6, the external diameter of spigot surface 91 reduces gradually. The middle of the chain wheel 5 is provided with a through air passage 51, the air passing space 8 is communicated with the oil gas passage 2 through the air passage 51, and the tip of the guide projection 9 is opposite to the radial middle of the oil gas passage 2.

The engine work, sprocket 5 is rotatory to drive camshaft 1 and centrifugal valve 6 rotatory, and centrifugal valve 6 is rotatory to drive separation piece 7 rotatory, inhales gas space 8 with the air-fuel mixture, at this in-process, under the effect of centrifugal force, realizes oil-gas separation for the first time, makes the machine oil content that enters into the oil-gas mixture in the oil-gas passage 2 through gas passage 51 reduce. Oil-gas mixture moves along oil gas passageway 2, and camshaft 1 is rotatory, and engine oil is under the effect of centripetal force and the promotion of waste gas, and engine oil moves and passes through separation channel recycle once more along oil gas passageway 2's inner wall, and waste gas passes through the curved joint 3 and discharges, realizes the oil-gas separation of second time.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms camshaft 1, recessed section 11, oil and gas channel 2, constricted section 21, crank joint 3, transition section 31, separating rib 32, separating oil channel 4, sprocket 51, gas passage 51, centrifugal valve 6, separating plate 7, gas passage space 8, guide projection 9, guide surface 91, etc. are used more here, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The utility model provides a camshaft assembly's oil-gas separation structure, includes in camshaft (1) along oil-gas channel (2) that camshaft (1) axial runs through, its characterized in that, oil-gas separation structure still includes crank joint (3), separation sand grip (32) that are spiral setting along the camshaft axial have on the lateral wall of crank joint (3) inlet end, the inlet end of crank joint (3) is worn to establish in the gas outlet of oil-gas channel (2), form between the inner wall of oil-gas channel (2), the lateral wall of crank joint (3) and separation sand grip (32) and supply that engine oil passes through to be spiral form separation oil duct (4).

2. The oil-gas separation structure of the camshaft assembly as claimed in claim 1, wherein one section of the inner wall of the oil-gas channel (2) is a ring-shaped inward-protruding necking section (21), and the connection between the two ends of the necking section (21) and the inner wall of the oil-gas channel (2) is arc-shaped.

3. The oil-gas separating structure of a camshaft assembly as claimed in claim 2, wherein the camshaft (1) has a recessed section (11) which is annularly and inwardly recessed, and the recessed section (11) is disposed corresponding to the necking section (21).

4. The oil-gas separation structure of a camshaft assembly as claimed in claim 1, 2 or 3, wherein the separation rib (32) is fitted to the inner wall of the oil-gas passage (2).

5. The structure for separating oil from gas of a camshaft assembly as claimed in claim 1, 2 or 3, wherein the separating rib (32) is of one-piece construction with the crank adapter (3).

6. The oil-gas separation structure of a camshaft assembly according to claim 1, 2 or 3, characterized in that the spiral direction of the separation oil passage (4) coincides with the rotation direction of the camshaft (1).

7. The air-oil separating structure of a camshaft assembly as claimed in claim 1, 2 or 3, characterized in that the intake end of the crank joint (3) and the middle portion of the crank joint (3) have a transition section (31), and the outer diameter of the transition section (31) is gradually reduced along the direction from the intake end of the crank joint (3) to the middle portion of the crank joint (3).

8. The oil-gas separation structure of the camshaft assembly as claimed in claim 1, 2 or 3, wherein the camshaft (1) has a sprocket (5) at the gas inlet end, the oil-gas separation structure further comprises a centrifugal valve (6) fixedly connected to the outer side of the sprocket (5), one side of the centrifugal valve (6) close to the sprocket (5) is provided with a plurality of separation sheets (7) which are convexly arranged, the separation sheets (7) are arc-shaped, all the separation sheets (7) are arranged at intervals and distributed annularly, all the inner ends of the separation sheets (7) are enclosed to form a gas passing space (8), the middle of the sprocket (5) is provided with a gas passing channel (51) which penetrates through, and the gas passing space (8) is communicated with the oil-gas channel (2) through the gas passing channel (51).

9. The oil-gas separation structure of a camshaft assembly according to claim 8, wherein the centrifugal valve (6) is provided with a convexly-arranged guide projection (9), the guide projection (9) is located in the middle of the gas passing space (8), the outer side wall of the guide projection (9) is an inwardly-concave arc-shaped guide surface (91), and the outer diameter of the guide surface (91) is gradually reduced along the centrifugal valve (6) towards the sprocket (5).

10. The oil-gas separation structure of a camshaft assembly as claimed in claim 9, wherein the tip of the guide projection (9) is directly opposite to the middle of the oil-gas passage (2) in the radial direction.