WO2012055149A1

WO2012055149A1 - Diesel engine gear case structure

Info

Publication number: WO2012055149A1
Application number: PCT/CN2011/001141
Authority: WO
Inventors: 肖亨琳
Original assignee: 无锡开普动力有限公司
Priority date: 2010-10-31
Filing date: 2011-07-11
Publication date: 2012-05-03
Also published as: CN101963110A; CN101963110B

Abstract

A diesel engine gear case structure comprising a gear case base plate (1), a gear train (2), a gear case cover (3), a cylinder head (9), and a cylinder block (10). The gear case base plate (1) is connected to the cylinder block (10) and the cylinder head (9). The gear train (2) is arranged at the front end of the gear case base plate (1) by means of holes on the gear case base plate (1). The gear case cover (3) covers the gear train (2) and locks onto the gear case base plate (1). A crankshaft timing gear (2a), an oil pump gear (2b), a camshaft gear (2c), a first idler gear (2d), a water pump gear (2e), a second idler gear (2f), a third idler gear (2g), a fourth idler gear (2h), and a fuel injection pump gear (2i) are arranged in the gear train. The gear case structure is simple, compact, sound, and practical. The gear case structure simplifies the overall structure of the engine; makes replacing the fuel injection pump gear and the camshaft gear easy; is beneficial for adjusting the oil supply advance angle and calibrating the top dead center of the engine; strengthens the gear case cover; and reduces gear noise inside the gear case as well as external vibration caused by the gear train, which is beneficial to engine maintenance.

Description

Gear chamber structure of diesel engine

Technical field

The present invention relates to a gear train and gear chamber structure of a diesel engine, and belongs to the field of engine power units.

Background technique

In the prior art, the gear chamber portion contains gear trains that are driven by various systems in the engine to ensure proper operation of the engine. The crankshaft timing gear in the gear train directly drives the oil pump gear, and at the same time drives the water pump gear, the fuel injection pump gear and the camshaft gear through several idle gears. Through a certain gear ratio between the gears, a coordinated operation of the engine's cooling system, fuel system and valve train is ensured. The arrangement of the gear train directly affects the functional use of other parts of the gear chamber, and the entire engine structure is also complicated.

Summary of the invention

The object of the present invention is to overcome the above-mentioned deficiencies, thereby providing a gear chamber structure of a diesel engine, which can simplify the overall structure of the engine, realize convenient replacement of the fuel injection pump gear and the camshaft gear, and at the same time facilitate the oil supply advance angle. Adjustment and proofreading of the top dead center of the engine, lubrication of the gears and reduction of noise and vibration in the gear chamber.

According to the technical solution provided by the present invention, a gear chamber structure of a diesel engine includes a gear chamber bottom plate, a gear train, a gear chamber cover, a cylinder head, and a body. The gear chamber floor is connected with the body and the cylinder head, and the gear train passes through the gear chamber. The hole in the bottom plate is arranged at the front end of the bottom of the gear chamber, and the gear chamber cover covers the gear train and locks on the bottom plate of the gear chamber.

a crankshaft timing gear, an oil pump gear, a camshaft gear, a first idler gear, a water pump gear, a second idle gear, a third idle gear, a fourth idle gear, and a fuel injection pump gear are disposed in the gear train; The oil pump gear, the camshaft gear, the water pump gear, and the fuel injection pump gear are respectively installed in the hole of the bottom of the gear chamber by the shaft; the upper end of the crank timing gear is provided with a second idle gear, a third idle gear, a crank timing gear, The second idle gear and the third idle gear are mounted by the shaft in the hole of the bottom of the gear chamber; the second idle gear and the third idle gear are two coaxial gears that are mounted together; the first idle gear a fourth idler gear is fixed to the body and the cylinder head by a small hole in the idler gear mount through the gear chamber bottom plate; the crankshaft timing gear meshes with the oil pump gear and the second idle gear respectively; the second idle gear is The water pump gear meshes; the third idle gear meshes with the fourth idle gear and the first idle gear, respectively; the fourth idle gear meshes with the fuel injection pump gear; the first idle gear and the camshaft gear .

The gear chamber bottom plate is provided with four large holes and two small holes, and the four large holes are used for installing the positioning oil pump gear, the camshaft gear, the water pump gear and the fuel injection pump gear; the two small holes are used for installation Positioning the crankshaft timing gear, the third idler gear, and the second idler gear.

The gear chamber cover is provided with a camshaft gear hole, a fuel injection pump gear hole and a crank gear extension hole. The fuel pump gear hole is provided as a "D" shaped hole, and one side of the hole is a circular arc structure concentric with the crankshaft timing gear extending hole.

The gear chamber cover is arranged concentrically with the water pump gear, and a circular groove structure is arranged, and three circular tables which are concentric with the water pump installation hole are arranged at the edge of the circular groove, and each of the round tables is provided with a water pump Straight reinforcing ribs with concentric gears.

The gear chamber cover is provided with a fan support seat mounting hole, and a reinforcing rib is disposed around the outer periphery of each fan support seat mounting hole, and a ring rib is disposed inside the fan mounting seat mounting hole.

A charging generator bracket mounting hole is disposed on the gear chamber cover, and two linear ribs and a diagonal rib are disposed near the mounting hole of the charging generator bracket.

a camshaft gear cover plate and a fuel injection pump gear cover are mounted on the gear chamber cover, and a rib protruding from the outer shape is arranged near the mounting seat on the front surface of the camshaft gear cover plate and the fuel pump gear cover; The camshaft gear cover and the fuel pump gear cover are disposed on the reverse side with two concentric ring ribs and reinforcing ribs diverging from the intermediate ring ribs to the cover mounting holes.

A triangular mesh rib is disposed inside the gear chamber cover.

a phase sensor hole, a vent hole and a negative pressure sensor hole are disposed at a left side of the gear chamber cover; the phase sensor hole is disposed at a position of a horizontal axis of the camshaft gear; the vent hole allows a gas in the crankcase to be inside the cylinder head cover The gas is connected; the negative pressure sensor hole detects the negative pressure in the crankcase.

The present invention has the following advantages over the prior art:

The invention has the advantages of simple structure, compactness, reasonableness and practicality; the utility model has more functions added to the gear chamber cover, simplifies the overall structure of the engine, facilitates the replacement of the fuel injection pump gear and the camshaft gear, and facilitates the adjustment of the fuel supply advance angle. The proofreading of the engine top dead center increases the strength of the gear chamber cover, reduces the gear noise in the gear chamber and the external vibration of the gear train, and provides convenience for routine maintenance of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a schematic view showing the structure of a gear train and a gear chamber according to the present invention.

2 is a schematic view showing the structure arrangement of the gear train of the present invention.

3 is a schematic view of a gear bottom plate of the present invention.

4 is a schematic view showing the structure of the front end of the gear chamber cover of the present invention.

Fig. 5 is a schematic view showing the front structure of a gear chamber cover, a camshaft gear cover, and a fuel pump gear cover of the present invention.

Figure 6 is a view showing the internal structure of the gear chamber cover, the camshaft gear cover and the fuel pump gear cover of the present invention; Intention.

Figure 7 is a schematic view showing the A-direction structure of the gear chamber cover of the present invention.

detailed description:

The invention will be further described below in conjunction with the embodiments of the drawings:

The invention will be further described below in conjunction with the implementation of the drawings:

As shown in FIG. 1 to FIG. 7 , the gear chamber bottom plate 1 , the gear train 2 , the gear chamber cover 3 , the 0-shaped seal ring 4 , the camshaft gear cover plate 5 , the fuel injection pump gear cover gasket 6 , the fuel injection pump gear cover The plate 7, the crankshaft front oil seal 8, the body 10, the cylinder head 9, the air pipe 11, the charging generator 12, the oil pump 13, and the like. The gear train 2 is mainly composed of a crank timing gear 2a, an oil pump gear 2b, a cam gear 2c, a first idle gear 2d, a water pump gear 2e, a second idle gear 2f, a third idle gear 2g, a fourth idle gear 2h, and a spray. The oil pump gear 2i is composed of.

The present invention employs a gear chamber cover 3 to cover the gear train 2 and is locked to the gear chamber floor 1, and a portion of the bolt holes are locked to the body 10 and the cylinder head 9 through the gear chamber floor. The seal of the gear train 2 is ensured by the mounting surface of the gear chamber cover 3 and the finishing surface of the gear chamber bottom plate 1; the cam gear cover plate 5 is provided with an O-ring 4, and the fuel injection pump gear cover 7 is provided with a fuel injection pump gear cover The plate gasket 6 is provided with a crankshaft front oil seal 8 at the crankshaft timing gear 2a, and the lubricating oil flows into the oil pan from the lower end of the gear chamber cover 3.

As shown in FIG. 2, a crankshaft timing gear 2a, an oil pump gear 2b, a camshaft gear 2c, a first idle gear 2d, a water pump gear 2e, a second idle gear 2f, and a third idle gear are disposed in the gear train 2. 2g, fourth idle gear 2h, fuel injection pump gear 2i _; four large holes in the gear chamber bottom plate 1 are used for mounting the positioning oil pump gear 2b, the camshaft gear 2c, the water pump gear 2e, the fuel injection pump gear 2i, The shaft is mounted in a bore in the floor 1 of the gear chamber. Two small holes in the gear chamber bottom plate 1 are used for mounting the positioning crank timing gear 2a, the third idle gear 2g, and the second idle gear 2f. The upper end of the crank timing gear 2a is provided with a second idle gear 2f and a third idler. The gear 2g, the second idler gear 2f, and the third idler gear 2g are mounted by shafts in holes in the gear chamber floor 1; the two gears are coaxially operated double-layer gears mounted together. The first idler gear 2d and the fourth idler gear 2h are bolted to the body 10 and the cylinder head 9 through a small hole in the idler gear mount through the gear chamber bottom plate 1; the crankshaft timing gear 2a and the oil pump gear are respectively 2b, the second idle gear 2f is meshed; the second idle gear 2f is meshed with the water pump gear 2e; the third idle gear 2g is meshed with the fourth idle gear 2h and the first idle gear 2d, respectively; the fourth idle gear 2h and the fuel injection pump gear 2i Engagement; the first idler gear 2d meshes with the camshaft gear 2c. The second idle gear 2f drives the water pump gear 2e, and the third idle gear 2g drives the cam gear 2c and the fuel injection pump gear 2i through the secondary transmission of the first idle gear 2d and the fourth idle gear 2h. The arrangement of the first idle gear 2d and the fourth idle gear 2h facilitates the meshing gap adjustment of the camshaft gear 2c and the fuel injection pump gear 2i and the whole machine The peripheral components are arranged.

As shown in FIG. 3, the gear chamber bottom plate 1 is directly mounted on the body 10 and the cylinder head 9, and two small holes la and four large holes lb are arranged on the bottom plate of the gear chamber to facilitate positioning and lubrication of the gear; The shape of 1 adopts an irregular structure, which facilitates the arrangement of the intake pipe 11 charging generator 12 and the oil pump 13 of the whole machine.

As shown in Fig. 4, the gear housing cover 3 is provided with three large holes: a camshaft gear hole 3a, a fuel injection pump gear hole 3b, and a crank gear extension hole 3c. The camshaft gear hole 3a and the fuel injection pump gear hole 3b facilitate the adjustment of the gear and the timing matching symbol lc of the engine, and facilitate the replacement of the camshaft gear 2c and the fuel injection pump or the fuel injection pump gear 2i. The fuel injection pump gear hole 3b is provided as a "D"-shaped hole, and one side of the hole is a circular arc structure 3d concentric with the protruding hole of the crankshaft timing gear 2a, so that the connection between the fuel injection pump gear hole 3b and the crank gear extension hole 3c is made. The widening increases the strength of the gear chamber cover 3.

As shown in FIGS. 5 to 6, a large circular groove structure 3e is arranged at a position concentric with the water pump gear 2e on the gear chamber cover 3, and three circular tables concentric with the water pump mounting hole are provided at the edge of the groove. 3i, a linear reinforcing rib 3j concentric with the water pump gear 2e is respectively arranged on each round table, so that a large plane is avoided here; at the fan support seat mounting hole 3f, the outer circumference of each fan support seat mounting hole is set The ribs are close to the shape of the fan mount. The inside of the fan mounting hole 3f is provided with a large ring rib, and the reinforcement from the edge of the ring rib is concentrically distributed to the fan seat mounting hole. Reinforcement; two linear ribs and one rib 3g are also arranged near the charging generator bracket mounting hole 3h _{; the} camshaft gear cover 5 and the fuel injection pump gear cover 7 are mounted on the gear chamber cover 3, the front faces of the two covers The ribs 5a, 7a are arranged equidistantly with the outer shape of the mounting seat, and the two concentric annular ribs and the reinforcing ribs 5b, 7b diverging from the intermediate ring ribs to the mounting holes of the cover plates are arranged on the reverse side; Each bolt is arranged inside the cover 3a They are connected to the sub-web stiffeners 3k. The above structures respectively reduce the resonance of the gear chamber cover, reduce the noise of the gear train 2, increase the strength of the gear chamber cover 3, and facilitate the installation of the peripheral components of the engine.

As shown in Fig. 7, a phase sensor hole 3m, a vent hole 3n, and a negative pressure sensor hole 3p are added to the left side of the gear chamber cover 3. The phase sensor hole 3m is disposed at a horizontal axis position of the camshaft gear 2c for detecting the engine speed or the stop position; the vent hole 3m can connect the gas in the crankcase with the gas in the cylinder head cover to make the oil and gas in the crankcase Separate circulation; Negative pressure sensor hole 3η provides convenience for detecting negative pressure in the crankcase. When the machined holes are not used, the seal of the gear chamber cover 3 can be achieved as long as the holes are not machined or blocked.

Claims

Claim

A gear chamber structure of a diesel engine, comprising a gear chamber bottom plate (1), a gear train (2), a gear chamber cover (3), a cylinder head (9) and a body (10), characterized in that: the gear chamber The bottom plate (1) is connected to the body (10) and the cylinder head (9), and the gear train (2) is arranged at the front end of the gear chamber bottom plate (1) through a hole in the gear chamber bottom plate, and the gear chamber cover (3) covers the gear train (2) and installed in the gear chamber floor

(1) Upper; a crankshaft timing gear (2a), an oil pump gear (2b), a camshaft gear (2c), a first idle gear (2d), and a water pump gear (2e) are arranged in the gear train (2) a second idle gear (2f), a third idle gear (2g), a fourth idle gear (2h), and a fuel injection pump gear (2i); the oil pump gear

(2b), the camshaft gear (2c), the water pump gear (2e), and the fuel injection pump gear (2i) are respectively mounted by the shaft in the hole of the gear chamber bottom plate (1); the crank timing gear (2a) is disposed at the upper end There are a second idler gear (2f), a third idler gear (2g), a crankshaft timing gear (2a), a second idler gear (2f), and a third idler gear (2g) mounted by a shaft on the gear chamber floor (1) The second idler gear (2f) and the third idler gear (2g) are two coaxial gears mounted in a coaxial operation; the first idle gear (2d) and the fourth idle gear (2h) The hole in the idler gear mount passes through the gear chamber bottom plate (1) and is bolted to the body (10) and the cylinder head (9); the crank timing gear (2a) and the oil pump gear (2b), second The idler gear (2f) meshes; the second idle gear (2f) meshes with the water pump gear (2e); the third idle gear (2g) meshes with the fourth idle gear (2h) and the first idle gear (2d), respectively; The idler gear (2h) meshes with the fuel injection pump gear (2i); the first idle gear (2d) meshes with the camshaft gear (2c).

A gear chamber structure for a diesel engine according to claim 1, wherein said gear chamber floor (1) is provided with six holes.

A gear chamber structure for a diesel engine according to claim 1, wherein said gear chamber cover (3) is provided with a camshaft gear hole (3a), a fuel injection pump gear hole (3b) and a crank gear The oil injection pump gear hole (3b) is provided as a D-shaped hole, and one side of the D-shaped hole is a circular arc structure concentric with the protruding hole of the crankshaft timing gear (2a).

A gear chamber structure for a diesel engine according to claim 1, wherein said gear chamber cover (3) is concentric with the water pump gear (2e), and a circular arc groove (3e) is arranged. Three round tables (3i) concentric with the pump mounting hole are arranged at the edge of the circular groove, and each round table is provided with a linear reinforcing rib (3j) concentric with the water pump gear (2e).

The gear chamber structure of a diesel engine according to claim 1, wherein the gear chamber cover (3) is provided with a fan support seat mounting hole (3f), and the outer periphery of the fan support seat mounting hole is disposed. There are ribs, and the inside of the fan mount mounting hole (3f) is provided with a ring rib.

6. A gear chamber structure for a diesel engine according to claim 1 wherein said A charging generator bracket mounting hole (3h) is arranged on the gear chamber cover (3), and two linear ribs and a diagonal rib (3g) are arranged near the charging generator bracket mounting hole (3h).

A gear chamber structure for a diesel engine according to claim 1, wherein said gear chamber cover (3) is provided with a cam gear cover plate (5) and a fuel pump gear cover plate (7). Elongated mounting ribs are arranged near the mounting on the front of the camshaft gear cover (5) and the fuel pump gear cover (7).

8. A gear chamber structure for a diesel engine according to claim 7, wherein said camshaft gear cover (5) and said fuel pump gear cover (7) are arranged with two concentric annular ribs on the reverse side thereof. The intermediate ring ribs are ribs that diverge toward the camshaft gear cover (5) and the fuel pump gear cover (7).

A gear chamber structure for a diesel engine according to claim 1, wherein said gear chamber cover (3) is internally provided with a triangular mesh rib (3k).

10. The gear chamber structure of a diesel engine according to claim 1, characterized in that the left side position of the gear chamber cover (3) is provided with a phase sensor hole (3m), a vent hole (3η) and a negative Pressure sensor hole (3p); phase sensor hole (3m) is disposed at the horizontal axis position of the camshaft gear (2c); vent hole (3m) allows gas in the crankcase to communicate with gas in the cylinder head cover; (3η) To detect the negative pressure in the crankcase.