JPH09296782A - Rotary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce sliding frictional resistance sharply by arranging a guide means which consists of a guide groove for guiding rotation of a rotor and a guide ball which rolls in the guide groove, between the rotor and a cover or a housing. SOLUTION: A guide means for rotary-guiding a rotor 5 along a trochoid curve 6 is arranged between a cover 2 and the rotor 5, which consists of an endless guide groove 8 formed on the outer peripheral surface of the inner side surface 2b of a cover 2, three holding grooves 17a to 17c formed on one side surface 5e of the cover inner side surface 2b side of the rotor 5, and a guide ball 9 which is held in the holding grooves 17a to 17c freely to roll. When a driving shaft 4 is rotated and driven through a driving pulley 12, an eccentric collar 10 is also synchronously rotated so as to transmit turning effort to the rotor 5 through the outer peripheral surface and a rotor inner circumferential surface 5d. The rotor 5 is guided smoothly while rolling each guide ball 9 of the guide means in the guide groove 8 so as to rotatably operate along the trochoid curve 6.

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. In the invention described above, a housing in which an approximately eyebrows-like recess is formed, a cover closing one end opening of the recess, a housing rotatably housed in the recess of the housing, and each top is an inner peripheral surface of the recess. A substantially triangular rotor that is slidably rotated along a trochoidal curved surface, a drive shaft that penetrates through the housing and that transmits a rotational force to the rotor through an eccentric collar, the trochoidal curved surface and the rotor outer periphery. A plurality of working chambers formed between the working surface and the surface, and a passage portion for letting out the non-compressed fluid in one working chamber whose volume decreases during the compression stroke accompanying the rotation of the rotor to the outside. A rotary pump, characterized in that a guide means including a guide groove for guiding the rotational movement of the rotor and a guide ball rolling in the guide groove is provided between the rotor and the cover or the housing. I am trying.

According to a second aspect of the present invention, the guide groove is
While being formed on the inner surface of the cover along the trochoid curved surface, the guide ball is rotatably held in a holding groove formed on one side surface near the top of the rotor.

According to a third aspect of the present invention, the guide groove is
The guide ball is formed along the trochoidal curved surface on the bottom surface of the recess of the housing, while the guide ball is rotatably held in a holding groove formed on the other side surface near the top of the rotor.

According to a fourth aspect of the present invention, the guide groove is
It is characterized in that it is formed along the trochoid curved surface on the side surface on the outer peripheral side of the rotor, while the guide ball is rotatably held in the holding groove formed on the inner side surface of the cover or the bottom surface of the recess of the housing.

[0013]

1 and 2 show an embodiment of a rotary pump according to the present invention, in which a housing 1 fixed to a cylinder block of an internal combustion engine and the housing 1 are fixed.
Fixed to one end of the housing with flat bolts 3
A cover 2 that closes one end opening of an eyebrow-shaped recess 1b formed inside, and a drive shaft 4 that is inserted through the housing 1 and through holes 1a and 2a formed in the central portions of the cover 2;
It is provided with a substantially triangular rotor 5 rotatably housed in the interior defined by a recess 1b inside the housing 1 and a 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 collar 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. Further, a circular hole is formed in the center of the rotor 5 as shown in FIG. 1, 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, Rotational force is transmitted from the eccentric plate 10b to the rotor 5 via the inner peripheral surface 5d.

As shown in FIG. 2, the housing 1 has a lower suction port 1 which communicates 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 that is a passage portion that connects 16a and the second operation chamber 16b adjacent to the first operation chamber 16a in the rotation direction of the rotor 5 is formed.

That is, the communication passage 20 is bent in a substantially U-shape, and the one end 5a of the one end 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.

A guide means is provided between the cover 2 and the rotor 5 for guiding the rotor 5 along the trochoid curved surface 6. This guide means is an endless guide groove 8 formed on the outer peripheral side of the inner surface 2b of the cover 2.
And three holding grooves 17a, 17b, 17c formed on one side surface 5e of the rotor 5 on the cover inner side surface 2b, and a guide ball 9 rotatably held in the holding groove 17. ing.

As shown in FIGS. 1 and 2, the guide groove 8 has a semicircular cross section and is cut along the trochoidal curved surface 6 into an eyebrow shape. In addition, the holding groove 17
Reference characters a and 17c have a substantially semicircular cross section, and are located near the tops 5a, 5b and 5c of the one side surface 5e of the rotor 5, that is, each top 5a.
They are arranged and formed on the line connecting the vertices of ˜5c and the center P of the rotor 5 and in the vicinity of the vertices 5a to 5c, and face the guide groove 8. Further, the guide ball 9 is made of steel, one half of which is fitted and held in each of the three holding grooves 17a to 17c, and the other half of which is rollably fitted in the guide groove 8. ing.

Therefore, according to the present embodiment, the input / output paths are opposite to those of the 4-stroke rotary engine, and when the drive shaft 4 is rotationally driven through the drive pulley 12, the eccentric collar 10 also rotates synchronously with the outer peripheral surface. Inner surface of rotor 5
The rotational force is transmitted to the rotor 5 via d. Therefore, in the rotor 5, each guide ball 9 of the guide means has the guide groove 8
While rolling inside, it is smoothly guided and rotates along a trochoidal 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
Lubricating oil in the working chamber 16a flows into the second working chamber 16b to allow the volume reduction accompanying the transition of the first working chamber 16a. 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 making some improvements to the basic structure of the rotary engine, the respective working chambers 16a to 16c can be realized. The discharge amount per one rotation of the rotor 5 can be increased as the volume of the pump increases, and the pump efficiency can be improved. That is, each working chamber 1
Since the maximum volume of 6a to 16c is larger than that of other internal gear pumps and the like, the discharge amount per time becomes large. 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.

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.

Further, in this embodiment, the guide groove 8 and the holding grooves 17a to 17c and each guide ball 9 are used as the guide means of the rotor 5 instead of the gear, so that the structure is greatly simplified and the number of parts is reduced. Can be achieved. Therefore, the manufacturing work efficiency of the guide means can be improved and the cost can be reduced.
Moreover, in the guide means, since each guide ball 9 rolls in the guide groove 8, the sliding friction resistance becomes extremely small, a smoother guide action of the rotor 5 is obtained, and wear occurs. Is prevented.

Further, the guide means includes the cover 2 and the rotor 5.
Since three guide balls 9 are used between and, a space for mounting a gear as in the conventional case is not required at all, whereby the pump can be made smaller and lighter.

As a second embodiment of the present invention, the guide groove 8 of the guide means is formed on the bottom surface of the recess 1b of the housing 1 along the trochoid curved surface 6, and on the other side surface 5f of the rotor 5 on the recess 1b side. It is also possible to form three holding grooves 17a to 17c and form the guide balls 9 in the holding grooves 17a to 17c.

Further, in the third embodiment, the guide groove of the guide means is formed on the outer peripheral side of the rotor 5 on the side surface 5e or the other side surface 5f, while a plurality of holding grooves are formed on the cover 2.
It is also possible to form it on the inner side surface 2b of the above or on the bottom surface of the concave portion 1b of the housing 1 so that the guide ball is rotatably held therein.

[0029]

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. Since the guide means of the rotor is constituted by the guide groove and the guide ball rolling in the guide groove instead of the complicated gear, the structure can be greatly simplified and the number of parts can be reduced. Work efficiency can be improved and cost can be reduced.

In particular, since the guide balls roll in the guide grooves to guide the rotor, the sliding friction resistance is greatly reduced, and the rotor can be smoothly guided at all times.
The inner surface of the guide groove is prevented from being worn.

Further, since the guiding means is not required to have high processing accuracy, it is possible to improve the processing work efficiency and reduce the processing cost.

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 vertical sectional view showing an embodiment of a rotary type pump of the present invention.

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

[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 groove 9 ... Guide ball 10 ... Eccentric collar (eccentric collar) 16a -16c ... Working chamber 17a-17c ... Holding groove 20 ... Communication passage (passage part)

Claims (4)

[Claims] 1. A housing having a substantially cocoon-shaped recess formed therein, a cover closing one end opening of the recess, and a housing rotatably housed in the recess of the housing, each top of which is an inner peripheral surface of the recess. A substantially triangular rotor that is slidably rotated along a trochoidal curved surface, a drive shaft that penetrates through the housing and that transmits a rotational force to the rotor through an eccentric collar, the trochoidal curved surface and the rotor outer periphery. A rotary type pump having a plurality of working chambers formed between the surface and a surface, and a passage portion for letting out the non-compressed fluid in the one working chamber whose volume decreases during the compression stroke accompanying the rotation of the rotor to the outside. There is provided, between the rotor and the cover or the housing, guide means including a guide groove for guiding the rotational movement of the rotor and a guide ball rolling in the guide groove. Rotary type pump to be. 2. The guide groove is formed on the inner side surface of the cover along the trochoid curved surface, while the guide ball is rollable in a holding groove formed on one side surface near the top of the rotor. The rotary pump according to claim 1, which is held. 3. The guide groove is formed on the bottom surface of the recess of the housing along the trochoidal curved surface, while the guide ball is rollable in a holding groove formed on the other side surface near the top of the rotor. The rotary pump according to claim 1, which is held. 4. The guide groove is formed on the outer peripheral side surface of the rotor along the trochoidal curved surface, while the guide ball is rolled into a holding groove formed on the inner surface of the cover or the bottom surface of the recess of the housing. The rotary pump according to claim 1, wherein the rotary pump is held freely.