JPH04314908A - Lubricating device for engine with built-in trochoid lubricating pump - Google Patents

Abstract

PURPOSE:To simplify a structure of a lubricating device by keeping a discharge amount of a lubricating pump high, while suppressing a projecting amount in a front direction of a crank shaft. CONSTITUTION:A bottom plate 7 of a trochoid lubricating pump P is composed of a crank case front wall 1, and a housing 3 is abutted against and fixed to a front end face 2 of the crank case front wall 1. Thus, a thickness of a rotor 4 is maintained and a discharge amount of the lubricating pump P is highly kept. A projecting amount of the pump P is reduced by the thickness of the bottom plate 7, accordingly, and durability of a crank bearing is improved. In addition, an oil passage 10 is directly opened to the crank case front wall 1, so that structure and processing steps of the oil passage are simplified.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a lubrication system incorporating a trochoidal lubrication pump for an engine.The present invention relates to a lubrication system incorporating a trochoidal lubrication pump for an engine.The present invention suppresses the protrusion of the front end of the crankshaft, increases the durability of the crank bearing, and simplifies the structure of the lubrication pump. Provide what you can.

0002

[Prior Art] The basic structure of a trochoid type lubrication pump built-in lubrication system for an engine, which is the object of the present invention, is shown in FIG.
Alternatively, as shown in FIG. 4, a trochoidal lubrication pump 2 is disposed facing the front wall 1 of the crankcase of the engine E from the front, and the trochoidal lubrication pump 2 is rotatably housed within the housing 3. The oil strainer 8 is connected to the suction port 5 through an oil passage 10, and the rotor 4 is connected to the rotation shaft 11 of the engine E. This is a format linked to .

This type of prior art is shown in FIGS. 4 to 6.
As shown in FIG. 2, the trochoidal lubrication pump P is fixed in a protruding manner in the space 50 on the front side of the front crankcase wall 1, and the front and rear thickness of the lubrication pump P from the bottom plate 7 to the housing 3 is fixed to the front of the crankcase front wall 1. At the same time, a detour-shaped oil passage 10 is provided extending from the side wall 51 of the crankcase to the front wall 1, and an oil passage pipe 53 led out from the outlet of the oil strainer 8 is connected to this oil passage. There is one that is connected to the suction port 5 of the bottom plate 7 via 10.

0004

[Problems to be Solved by the Invention] In the above prior art, the crankshaft 1 is located further forward than the trochoid type lubrication pump P.
1 protrudes, and the gear 54 for driving the radiator cooling fan is fixed to this protrusion. Therefore, the crankshaft 11 is made extra by the thickness of the lubricant pump P to protrude and fix the whole lubricant pump P in the front space 50 of the front wall 1 of the crankcase. It is necessary to make the crankshaft 11 protrude for a long time, which reduces the durability of the bearing that supports the crankshaft 11.

[0005] Therefore, it is possible to reduce the thickness of the trochoid type lubrication pump P to suppress the amount of protrusion of the crankshaft 11, but in this case, the thickness of the rotor 4 becomes thinner and the discharge amount of the lubrication pump P decreases. The problem remains that it is decreasing. Furthermore, if the diameter of the rotor 4 is increased, the discharge amount of the lubrication pump P will increase, but since the diameter of the rotor 4 is limited by the outer diameter of the drive gear 55 of the lubrication pump P, an increase in the rotor diameter will reduce the thickness of the rotor. It is difficult to overcome the problem.

On the other hand, among the lubricating devices for engine E,
In particular, the oil passage 10 is connected from the side wall 51 of the crankcase to the front wall 1.
Since the oil passage 10 is passed through in a roundabout manner, the oil passage 10 becomes long and curved, which complicates processing and structure, and increases manufacturing cost. The technical object of the present invention is to suppress the amount of forward protrusion of a crankshaft while maintaining a high discharge rate of a lubricating pump, and to simplify the structure of a lubricating device.

[0007]

[Means for Solving the Problems] Means for achieving the above objects will be explained below with reference to drawings showing embodiments. That is, the present invention provides a lubrication device incorporating a trochoidal lubrication pump for an engine having the basic structure described above, in which the bottom plate 7 of the trochoidal lubrication pump P is constituted by the front wall 1 of the crankcase, and the front end surface 2 of the front wall 1 of the crankcase The rear end surface 23 of the housing 3 is abutted and fixed to the front wall 1 of the crankcase, and an oil passage 10 is formed in the wall 12 of the front wall 1 of the crankcase.

[0008]

[Operation] Since the bottom plate 7 of the trochoid type lubrication pump P is constructed from the front wall 1 of the crankcase, the amount of protrusion of the lubrication pump P from the front wall 1 of the crankcase can be reduced by the thickness of the bottom plate 7. Further, since the displacement of the bottom plate 7 suppresses the amount of protrusion of the lubricant pump and maintains the thickness of the rotor 4, the discharge amount of the lubricant pump P does not decrease.

Furthermore, since the oil passage 10 is formed in the wall 12 of the front wall 1 of the crankcase, the oil passage 1 is complicated and detoured from the side wall to the front wall of the crankcase, unlike the conventional technology.
There is no need to leave 0 blank, and the structure of the oil passage 10 is simplified. Furthermore, although the oil passage 10 has conventionally been formed by drilling a hole, in the present invention, it can be formed by casting, for example, at the same time as manufacturing the crankcase, thereby simplifying the processing process.

0010

Effects of the Invention (1) Since the bottom plate of the trochoidal lubrication pump is constructed from the front wall of the crankcase, the amount of protrusion of the lubrication pump can be reduced while maintaining a high discharge amount of the lubrication pump. Therefore, the durability of the crank bearing can be improved by shortening the crankshaft by the thickness of the bottom plate.

(2) Since the oil passage is provided in the front wall of the crankcase, the structure of the entire lubricating device is simplified, and
The oil passage can be formed at the same time as the crankcase is manufactured, simplifying the processing process.

0012

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Figure 1 is a vertical right side view of the main parts of a vertical water-cooled engine, Figure 2
3 is a longitudinal sectional front view of the main parts of the same engine, and FIG. 3 is a longitudinal sectional view of the trochoid type lubrication pump.

As shown in FIG. 1, a gear case 13 is fixed in front of the front crankcase wall 1 of a vertical water-cooled engine E, and a drive gear 14 and a cooling fan drive pulley 15 are mounted in front of the crankshaft 11 of the engine E. The trochoidal lubrication pump P is installed in the gear case 13 so as to face the front wall 1 of the crankcase from the front. As shown in FIG. 3, the trochoidal lubrication pump P includes a cup-shaped housing 3, a rotor 4 consisting of an inner and an outer rotor rotatably housed in the housing 3, and an inlet 5 and an outlet 6 that are open. It consists of a bottom plate 7. An oil pan 17 is fixed below the crankcase 16 of the engine E,
An oil strainer 8 is housed in an oil pan 17, and a drive shaft 18 directly connected to a rotor (inner rotor) 4 is interlocked with the drive gear 14 of the crankshaft 11 from below via a pump side drive gear 19.

As shown in FIG. 1, the bottom plate 7 of the trochoid type lubrication pump P is composed of the front wall 1 of the crankcase.
The rear end surface 23 of the housing 3 is fixed in contact with the front end surface 2 of the front wall 1 of the crankcase, and the entire lubricating pump P is retreated from the front wall 1 of the crankcase by the thickness of the bottom plate 7. That is,
As shown in FIG. 3, the front end surface 2 of the front wall 1 of the crankcase is located at the dashed line in the prior art, but in this embodiment it is at the dashed-dotted line, so the lubrication pump P is moved from this dashed line to the dashed-dotted line. The crankshaft 11 is retracted backward from the crankcase front wall 1 by a distance A (that is, the thickness of the bottom plate 7), and the protrusion dimension of the crankshaft 11 from the front wall 1 can be shortened by the distance A.

Further, as shown in FIGS. 1 and 2, an oil passage 10 is provided vertically through the wall 12 of the front wall 1 of the crankcase, and the upper end of the oil passage 10 is connected to the suction of the pump P. The lower end portion 21 of the oil passage 10 is connected to the oil strainer 8 via the oil passage pipe 22 . In this case, the oil passage 10 is formed at the same time as the crankcase 16 is manufactured, for example, by casting.

The functions of this embodiment will now be explained. Connect the bottom plate 7 of the trochoid type lubrication pump P to the front wall 1 of the crankcase.
Therefore, the amount of protrusion of the lubrication pump P from the crankcase front wall 1 is reduced by the thickness of the bottom plate 7, the crankshaft 11 is shortened by the thickness of the bottom plate 7, and the durability of the crank bearing 20 is improved. You can improve. Moreover, in this case, the bottom plate 7
Since the displacement of the lubricant pump P can suppress the amount of protrusion of the lubricant pump P and maintain the thickness of the rotor 4 itself, the discharge capacity of the lubricant pump P will not be reduced.

Furthermore, since the oil passage 10 is formed by casting in the flesh wall 12 of the front wall 1 of the crankcase in the form of a straight tube, the oil passage 10 is formed by casting from the side wall 51 of the crankcase to the front wall 1 as in the prior art described above. There is no need to drill holes in the passage 10 in a complicated roundabout manner (see FIG. 6), and both the structure and the machining process of the oil passage 10 are simplified, and manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical right side view of main parts of a vertical water-cooled engine.

FIG. 2 is a longitudinal sectional front view of the main parts of the engine.

FIG. 3 is a longitudinal cross-sectional view of a trochoidal lubrication pump.

FIG. 4 is a diagram corresponding to FIG. 1 showing the prior art;

FIG. 5 is a diagram corresponding to FIG. 2 showing the prior art.

FIG. 6 is a schematic perspective view of the vicinity of an oil passage showing the prior art.

[Explanation of symbols]

E engine P Trochoid type lubrication pump 1　Crankcase front wall 2 Front end surface of 1 3 Housing 4 Rotor 5 Inlet 6 Discharge port 7 Bottom plate 8 Oil strainer 10 Oil passage 11 E rotation axis 12 1 flesh wall 23 Rear end surface of 3

Claims (1)

[Claims] Claim 1: A trochoidal lubrication pump (P) facing the front wall (1) of the crankcase of the engine (E) from the front side.
), the trochoidal lubrication pump (P) is connected to the housing (3), the rotor (4) rotatably housed in the housing (3), and the suction port (5) and discharge port (6) are open. It consists of a bottom plate (7) and an oil strainer (8).
) In a lubrication device with a built-in trochoid-type lubrication pump for an engine, which communicates with the suction port (5) via an oil passage (10) and connects a rotor (4) to a rotating shaft (11) of an engine (E). , the bottom plate (7) of the trochoidal lubrication pump (P) is constructed from the front wall of the crankcase (1), and the housing (3) is attached to the front end surface (2) of the front wall (1) of the crankcase.
The rear end surface (23) is abutted and fixed, and the front wall of the crankcase (
A lubrication device incorporating a trochoid-type lubrication pump for an engine, characterized in that an oil passageway (10) is provided in the wall (12) of 1).