JPH09291890A - Rotary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize simplification of a structure while achieving the light weight of a pump and miniaturization, as well as to improve pump efficiency. SOLUTION: A pump is provided with a rotor 5 to be rotated by the slide contact of a plurality of top parts 5a to 5c to a trocoid surface 6 of a cocoon shaped recessed part 1b of a housing 1, and three operating chambers 16a to 16c formed between the trocoid curved surface 6 and the rotor outer peripheral surface, and performs the pump action by changing capacities of respective operating chambers with the rotation of the rotor by a driving shaft 4 and an eccentric collar 10. A guide means for rotationally guiding the rotor 5 along the trocoid curved line is constituted of a guide surface 8 making use of the trocoid curved surface 6, and continuous surfaces 8a to 8d formed on respective opening edges of openings 18a, 19a of intake and discharge ports 18, 19 and openings 20a, 20b of a communication passage 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump used as an oil pump for lubricating oil or hydraulic oil of automobiles.

[0002]

As is well known, there are various types of oil pumps, such as an internal gear pump and a plunger pump, for supplying lubricating oil to an automobile internal combustion engine or supplying hydraulic oil to a power steering. ing.

Generally, as an automatic internal combustion engine, in addition to a so-called reciprocating engine, four strokes of intake, compression, expansion, and exhaust are continuously performed every one rotation movement while the rotor slides on the trochoid curved surface. A known Wankel type rotary engine is known.
726, etc.).

To explain the outline of this Wankel type rotary engine, side housings are provided on both sides of a rotary housing having a peritrochoidal surface on the inner peripheral surface, and a substantially triangular rotor is provided inside the rotary housing. Are rotatably housed while slidingly contacting the peritrochoid curved surface, and three working chambers are formed between the rotor outer peripheral surface and the peritrochoid curved surface. Also,
A disc-shaped eccentric portion whose center is eccentric to the axis of the output shaft is integrally provided on a predetermined outer peripheral surface of the output shaft, which is a crankshaft passing through both side housings. The inner peripheral surface of the rotor is bearing. Further, a fixed gear having a small diameter is fixed to the inner peripheral surface of the output shaft through hole of one side housing so as to face the working chamber, and a rotor gear that meshes with the fixed gear is formed on the inner peripheral surface of one end of the rotor. Has been done.

The rotary housing has an intake port and an exhaust port formed in parallel on one side, and a pair of spark plugs mounted on the opposite side.

The eccentric portion and the output shaft rotate as the rotor rotates after the engine is started, and
When the rotor gear rotates in mesh with the fixed gear, the apex of the rotor draws a peritrochoid curve that is a basic curve of the rotor housing to perform rotational movement, while transmitting power to the output shaft. That is, as the rotor rotates, the intake port opens, the intake stroke begins, and when the volumes of the two working chambers gradually increase and reach the maximum, the intake port is automatically closed. After that, the air-fuel mixture in the working chamber is compressed, ignited in the vicinity of the compression top dead center, and transferred to the expansion stroke. Next, after going through the expansion stroke, the exhaust port opens,
After the exhaust stroke is completed, the suction stroke is started again. This causes the output shaft to rotate 3 times for each rotation of the rotor,
Power is transmitted to the output shaft.

[0007]

However, in the above rotary engine, as a guide means for rotating the rotor along a trochoidal curve, it is fixed to a separate rotor gear fixed to the rotor and the side housing. The rotation guide of the rotor is performed by meshing the two gears whose shaft centers are eccentric with each other. For this reason, the structure of the entire guide means becomes complicated and a large number of parts are required. As a result, the manufacturing work efficiency is lowered and the cost is soared.

In addition, high machining accuracy of each tooth is required in order to ensure the meshing accuracy of each gear. Therefore, the workability is deteriorated and the processing cost is soared. Furthermore, since a relatively large space is required to mount each gear on the rotor or side housing,
This leads to an increase in overall size and weight.

[0009]

The present invention has been devised to solve the problems of the rotary engine when the oil pump utilizing the basic structure of the rotary engine is put to practical use. The invention described is a housing whose one end opening is closed by a cover, a rotor having a substantially triangular shape whose top portion is slidably rotated along a trochoidal curved surface formed on the inner peripheral surface of the housing, and is disposed through the housing, A drive shaft for transmitting a rotational force to the rotor via an eccentric collar, a plurality of working chambers formed between the trochoid curved surface and a rotor outer peripheral surface, and a plurality of working chambers formed in the housing for rotating the rotor. Accordingly, the suction port and the discharge port communicating with the working chamber, one working chamber whose volume decreases during the compression stroke accompanying the rotation of the rotor, and the rotor rotation direction in the working chamber. A rotary type pump having a communication passage communicating with another adjacent working chamber on the side, and performing a pumping action by changing the volume of the working chamber in accordance with the rotation of the rotor, wherein a trochoid curved surface of the housing is provided. It is characterized in that it is configured as a guide means for guiding the rotational movement of the rotor.

According to a second aspect of the present invention, the guide means has a continuous surface continuous with the trochoid curved surface at each opening edge of the suction port and the discharge port facing the working chamber and the communication passage. It has a feature.

[0011]

1 to 3 show an embodiment of a rotary pump according to the present invention, in which one end of a housing 1 fixed to a cylinder block of an internal combustion engine is closed at its one end opening. The cover 2 is fixed by flat bolts 3, and the drive shaft 4 is inserted through the through holes 1a and 2a formed in the central portions of the housing 1 and the cover 2, respectively.
Further, a substantially triangular rotor 5 is rotatably provided inside the housing 1 which is defined by the recess 1b formed inside the housing 1 and the cover 2.

In the housing 1, the inner peripheral surface of the concave portion 1b is formed into a cocoon-shaped trochoidal curved surface 6, and a cylindrical protruding portion 7 is integrally provided on the outer peripheral surface of the inner peripheral portion opposite to the cover 2. ing. The outer shape of the cover 2 is the housing 1
It is formed in the same rectangular shape as the above, and is positioned and fixed to the housing 1 by a positioning pin (not shown).

The drive shaft 4 is directly connected to a crankshaft (not shown) of an internal combustion engine and has a one-to-one correspondence with the crankshaft.
The eccentric collar 10, which is an eccentric collar, is fixed to the outer peripheral surface of the drive shaft 4 by the key 11 arranged in the longitudinal direction in the groove of the outer peripheral surface of the drive shaft 4, and the tip portion 4a. Further, the drive pulley 12 is fixed by a bolt 13 screwed from the axial direction.
Further, the gear portion 14 is fixed to the step portion 4b on the base end side of the drive shaft 4. Further, the drive pulley 12 has a cylindrical portion 12a fitted on the outer periphery of the drive shaft 4 on the inner peripheral portion of the main body, and transmits the rotational force to the drive shaft 4 via the timing belt. There is. The protrusion 7 of the housing 1
The seal member 1 is provided between the drive member 12 and the cylindrical portion 12a of the drive pulley 12.
5 are interposed.

The eccentric color 10 is shown in FIG.
As also shown in FIG. 3, a cylindrical portion 10 fitted on the outer peripheral surface of the drive shaft 4
a and an eccentric plate 10b integrally formed on the outer peripheral surface of the cylindrical portion 10a on the drive pulley 12 side, and its center P is eccentric from the axis X of the drive shaft 4 by ε. Further, the cylindrical portion 10a has front and rear end portions which are the insertion holes 1a of the housing 1.
And the cover 2 is extended to the insertion hole 2a of the cover 2, the front end portion is at the end edge of the tubular portion 12a of the drive pulley 12, and the rear end portion is at the gear portion
Are abutted on the respective end faces of the and are positioned in the axial direction.
The eccentric plate 10b has a plurality of large and small holes H arranged in the circumferential direction for weight reduction and weight balance.

The thickness of the rotor 5 is set to be slightly smaller than the width of the recess 1b of the housing 1, and each top 5
Three working chambers 16a, 16b, 16c are formed between the outer surface between a to 5c and the trochoidal surface 6, and at the same time, the tops 5a to 5c are in sliding contact with the trochoidal curved surface 6 to form a peritrochoidal curve. It is designed to rotate. As shown in FIG. 3, a circular hole is formed in the center of the rotor 5, and the inner peripheral surface 5d of the circular hole is fitted and supported by the outer peripheral surface of the eccentric plate 10b of the eccentric collar 10. .

As shown in FIG. 1, the housing 1 has a lower suction port 1 communicating with a recess 1b in one side wall.
8 and the upper discharge port 19 are formed so as to penetrate substantially in the horizontal direction, and the first working chamber whose volume decreases during the compression stroke is provided inside the other side wall opposite to the suction and discharge ports 18, 19. A communication passage 20 is formed which communicates the first working chamber 16a with the second working chamber 16b adjacent to the first working chamber 16a in the rotation direction of the rotor 5.

That is, the communicating passage 20 is bent in a substantially U-shape, and the one end 5a of the one end opening 20a is formed along with the rotation of the rotor 5 and the trochoidal curved surface 6 of the other side wall is formed.
The second working chamber 16b is formed so as to communicate with the first working chamber 16a that is separated from the second working chamber 16b. Further, the maximum volume value of the communication passage 20 is calculated from the maximum volume value of the first working chamber 16a as shown in FIG.
As shown in FIG. 5, one of the tops 5b is set to have a size equal to or larger than the volume value obtained by subtracting the volume value of the first working chamber 16a when the other end opening 20b is closed.

The trochoidal curved surface 6 of the housing 1 constitutes a guide means for rotationally guiding the outer peripheral surface of the rotor 5 along a trochoidal curve. That is, in this guide means, as shown in FIGS. 1 and 2, the trochoidal curved surface 6 of the rotor 5 serves as a basic guide surface 8, and the openings 18a of the suction port 18 and the discharge port 19 facing the recess 1b are formed. , 19a and the openings 2 of the communication passage 20.
Continuous surfaces 8a, 8b, 8c and 8d which are continuous with the guide surface 8 (trochoidal curved surface 6) are formed at the opening edges of 0a and 20b, respectively. That is, the continuous surfaces 8a, 8b, 8
c, 8d are formed on the inner surfaces of the guide walls 9a, 9b, 9c, 9d provided at the opening edges of the openings 18a, 19a, 20a, 20b, and are formed in an arc surface shape along the guide surface 8. There is. The guide walls 9a, 9b, 9c, 9d are formed by making a large cutout from the inner diameter of the opening edge of each opening 18a, 19a, 20a, 20b toward the cylindrical portion 12a side, and the width W of the trochoidal curved surface 6. Each opening from the width 18
It is set to a size obtained by subtracting the inner diameters of a, 19a, 20a and 20b.

Therefore, according to the present embodiment, when the input / output path is opposite to that of the 4-stroke rotary engine and the drive shaft 4 is rotationally driven through the drive pulley 12, the eccentric collar 10 also rotates synchronously with the outer peripheral surface. Through the rotor 5
To transmit rotational force. Therefore, the rotor 5 is smoothly guided while sliding on the guide surface 8 and the continuous surfaces 8a to 8d of the guide means, and rotationally moves along the trochoid curve. At this time, the lubricating oil is sucked into, for example, the first working chamber 16a communicating with the suction port 18, and the first working chamber 16a having the maximum volume due to the rotation of the rotor 5 is filled with the lubricating oil and compressed as it is. Move to the process. Then, at the same time when the compression stroke starts (the volume reduction of the first working chamber 16a starts), the first working chamber 16a communicates with the second working chamber 16b through the communication passage 20, so that the lubricating oil in the first working chamber 16a The first working chamber 16a flows into the second working chamber 16b.
Allow the volume to decrease with the transition. After that, the lubricating oil that has moved to the expansion stroke and filled in the second working chamber 16b is pressure-fed by the rotational force of the rotor 5 into the discharge port 19 communicating with the second working chamber 16b. As a result, a series of pumping operations are smoothly performed.

As described above, according to this embodiment, since the rotary type oil pump can be put into practical use by slightly improving the basic structure of the rotary engine, the respective working chambers 16a to 16c can be realized. The discharge amount per rotation of the rotor 51 can be increased as the volume of the pump increases, and the pump efficiency can be improved. That is, each working chamber 16
Since the maximum volume of a to 16c is larger than that of other internal gear pumps and the like, the discharge amount per time increases. As a result, if the pump capacity is the same as the previous oil pump,
The entire structure can be made sufficiently small, and the pump can be made compact and lightweight.

Further, since the structure is simpler than that of the conventional pump, the manufacturing work efficiency can be improved and the cost can be greatly reduced.

In particular, in this embodiment, the guide surface 8 and the continuous surfaces 8a, 8b, 8 which are trochoidal curved surfaces 6 are used instead of the gears.
Since c and 8d are configured as guide means for the rotor 5, the structure can be greatly simplified and the number of parts can be reduced. Therefore, manufacturing work efficiency can be improved and cost can be reduced.

Moreover, the openings 18a, 19a, 20a,
Since the continuity of the guide surface 8 is ensured by the continuous surfaces 8a to 8d provided at the opening edge of 20b, a smooth guiding action on the rotor 5 is always obtained.

Further, since the guide means uses the existing trochoidal curved surface 6, there is no need for a space for mounting a gear as in the conventional case, and the pump can be made smaller and lighter. .

The pump of the present invention is not limited to the oil pump of the above embodiment, but can be applied to pumps for other incompressible fluids. Further, the drive shaft 4 may be formed so that the rotational force is transmitted by a timing belt or the like instead of being directly connected to the crankshaft of the internal combustion engine.

[0026]

As is apparent from the above description, according to the rotary type pump of the present invention, it is of course possible to put the rotary type pump into practical use utilizing the basic structure of the rotary engine. The trochoidal curved surface is used instead of the complicated gears for the rotor guide means, which greatly simplifies the structure and reduces the number of parts.As a result, manufacturing efficiency and cost are reduced. Can be achieved.

Particularly, since the continuity of the entire trochoid curved surface is ensured by the continuous surface, a smooth smooth guiding action of the rotor can be obtained.

Since high processing accuracy is not required,
It is possible to improve processing efficiency and reduce processing costs.

Moreover, since it is not necessary to attach a conventional gear to the rotor or the like, the mounting space is completely unnecessary, and the pump can be made compact and lightweight.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a vertical sectional view showing an embodiment of a rotary pump of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 1b ... Recessed part 1c ... One side surface 2 ... Cover 2b ... Inner side surface 4 ... Drive shaft 5 ... Rotor 5a-5c ... Top part 6 ... Trochoid curved surface 8 ... Guide surface 8a, 8b, 8c, 8d ... Continuous surface 10 ... Eccentric Collars (eccentric collars) 16a to 16c ... Working chamber 18 ... Suction port 19 ... Discharge port 20 ... Communication passages 18a, 19a, 20a, 20b ... Opening

Claims (2)

[Claims] 1. A housing whose one end opening is closed by a cover, and a substantially triangular rotor whose top portion is slidably rotated along a trochoidal curved surface formed on the inner peripheral surface of the housing,
A drive shaft penetrating the housing, transmitting a rotational force to the rotor through an eccentric collar, a plurality of working chambers formed between the trochoid curved surface and a rotor outer peripheral surface, and formed in the housing. The suction port and the discharge port communicating with the working chamber according to the rotational position of the rotor, one working chamber whose volume decreases during the compression stroke accompanying the rotation of the rotor, and the working chamber adjacent to the working chamber on the rotor rotation direction side. A rotary type pump including a communication passage that communicates with another working chamber that changes the volume of the working chamber with the rotation of the rotor to perform a pumping action, wherein the trochoid curved surface of the housing is A rotary pump characterized by being configured as a guide means for guiding rotational movement. 2. The rotary according to claim 1, wherein the guide means has a continuous surface continuous with the trochoidal curved surface at each opening edge of the suction port, the discharge port, and the communication passage facing the working chamber. Type pump.