JPH09310682A - Rotary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the smooth guide action of a rotor at all times while simplifying a structure, and also improve the molding work efficiency of a guide means by arranging the guide means between a rotor and a cover or a housing, and composing the guide means of a guide groove, a guide pin, and an energizing means. SOLUTION: A device is provided with a nearly triangular shaped rotor 5 which is rotatably stored in an inside sectioned by the recessed part 1b of a housing 1 inner part and a cover 2. A guide means for guiding rotation of the rotor 5 is arranged between the rotor 5 and the cover 2. The guide means consists of a guide groove 8 formed along a trochoid curved surface, a guide pin 9 whose top end part is slid in the guide groove 8, and energizing means 21 for energizing the guide pin 9 in the bottom surface direction of the guide groove 8. Since the guide means of the rotor 5 is constituted by the guide groove 8 and the guide pin 9 mainly instead of a gear having a complex structure, it is possible to simplify the structure sharply, and reduce the number of parts.

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 Tari pump, between the rotor and the cover or housing, provided with a guide means for guiding the rotational movement of the rotor, the means in said guide, a guide groove formed along a trochoid curved surface,
It is characterized in that the tip portion is constituted by a guide pin that slides in the guide groove and a biasing means that biases the guide pin toward the bottom surface of the guide groove.

According to a second aspect of the present invention, the guide groove is
The guide pin is formed on the inner side surface of the cover along the trochoid curved surface, while the guide pin is held in a pin holding groove formed on one side surface near the top of the rotor so as to be able to move forward and backward, and the biasing means is pinned. It is characterized in that it is provided between the bottom surface of the holding groove and the base end surface of the guide pin.

According to a third aspect of the present invention, the guide groove is
The guide pin is formed along the trochoidal curved surface on the bottom surface of the recess of the housing, while the guide pin is held in a pin holding groove formed on the other side surface near the top of the rotor so as to be movable back and forth, and the biasing means is a pin. It is characterized in that it is provided between the bottom surface of the holding groove and the base end surface of the guide pin.

According to a fourth aspect of the present invention, the guide groove is
The guide pin is formed along the trochoidal curved surface on the outer peripheral side of the rotor, while the guide pin is movably held in the pin holding groove formed on the inner side surface of the cover or the bottom surface of the recess of the housing, and the biasing means is also provided. Is provided between the bottom surface of the pin holding groove and the base end surface of the guide pin.

According to a fifth aspect of the present invention, the urging means includes:
It is characterized by being formed of a coil spring or a disc spring.

[0014]

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 as 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. 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 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 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 one end 5a of the one end opening 20a is rotated along with the rotation of the rotor 5 and the trochoid 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.

Between the cover 2 and the rotor 5, guide means for guiding the rotor 5 along the trochoid curved surface 6 is provided. This guide means is an endless guide groove 8 formed on the outer peripheral side of the inner surface 2b of the cover 2.
A bottomed three pin holding groove 17 formed on one side surface 5e of the rotor 5 on the cover inner side surface 2b, and a guide pin 9 held in the pin holding groove 17 so as to be movable back and forth. The coil spring 2 is provided in the pin holding groove 17 and serves as a biasing means for biasing each guide pin 9 toward the guide groove 8.
And 1.

The guide groove 8 has a semicircular cross section as shown in FIGS. 1 and 2, and is cut along the trochoidal curved surface 6 into an eyebrow shape. Each of the pin holding grooves 17 has a bottomed cylindrical shape, and is located near the tops 5a, 5b, 5c of the one side surface 5e of the rotor 5, that is, on the line connecting the tops of the tops 5a to 5c and the center P of the rotor 5. It is arranged and formed in the vicinity of 5a to 5c and faces the guide groove 8. Further, the metal guide pin 9 has a base end portion 9a held in each pin holding groove 17 so as to be able to move forward and backward, and a tip end portion 9a.
b is slidably fitted in the guide groove 8.

Further, the coil spring 20 has bottom surfaces 17a to 17c of the pin holding grooves 17 and the guide pins 9 respectively.
It is mounted between the end face of the base end 9a of the
The tip end portion 9b is elastically contacted with the bottom surface 8a of the guide groove 8.

Therefore, according to this 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. Inner surface of rotor 5
The rotational force is transmitted to the rotor 5 via d. Therefore, the rotor 5 rotates smoothly along the trochoid curve while the tip 9b of each guide pin 9 of the guide means slides smoothly inside the guide groove 8. 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 16
Since "a" communicates with the second working chamber 16b through the communication passage 20, the lubricating oil in the first working chamber 16a flows into the second working chamber 16b, and the volume reduction accompanying the transition of the first working chamber 16a is allowed. To do. After that, the process proceeds to the expansion stroke and the second working chamber 16
The lubricating oil filled in b is pumped 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 the present 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 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.

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.

Further, in this embodiment, the guide pins 8 held in the guide groove 8 and the pin holding groove 17 are mainly used as guide means for the rotor 5 instead of the gears, so that the structure is greatly simplified and the parts are made larger. The points can be reduced. Therefore, the manufacturing work efficiency of the guide means can be improved and the cost can be reduced. Moreover, since the tip portion 9b of each guide pin 9 is in elastic contact with the bottom surface 8a of the guide groove 8 by the spring force of each coil spring 21, the clearance between the end surface of the tip portion 9b and the bottom surface 8a is always zero. be able to.

Therefore, in the case where the coil spring 21 is not provided, the machining accuracy of the guide groove 8 and the guide pin 9 for ensuring the above-mentioned constant clearance, that is, the guide groove 8 depth accuracy and the base end portion of each guide pin 9 are provided. It is not necessary to manage the accuracy of press-fitting depth of 9a into the pin holding groove 17 and the like. As a result, the work of forming the guide groove 8 and the guide pin 9 is facilitated, and the manufacturing work efficiency can be improved.

Further, by setting the above-mentioned clearance to zero, the space between the guide groove 8 and the guide pin 9 becomes liquid-tight, and the leakage amount of the fluid in the pump chamber to the outside is reduced,
The pump efficiency can be improved.

Further, since a space for mounting a gear as in the conventional case is not necessary at all, the size and weight of the pump can be reduced.

Further, as a second embodiment of the present invention, the guide groove 8 of the guide means is formed along the trochoid curved surface 6 on the bottom surface of the recess 1b of the housing 1, and on the other side surface 5f of the rotor 5 on the recess 1b side. Forming three pin holding grooves 17,
It is also possible to hold each of the guide pins 9 so that they can move back and forth, and further to mount a coil spring 21 between the guide pin 9 and the bottom surface of the pin holding groove 17.

Further, as a third embodiment, the guide groove of the guide means is formed on the one side surface 5e or the other side surface 5f of the outer peripheral side of the rotor 5, while the plurality of pin holding grooves are formed on the inner side surface of the cover 2. 2b or the recess 1b of the housing 1 may be formed on the bottom surface of the recess 1b to hold the guide pin forward and backward, and a coil spring may be mounted between the guide pin and the bottom surface of the pin holding groove. Is.

Further, as the urging means, a disc spring can be used instead of the coil spring.

[0034]

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 composed mainly of a guide groove and a guide pin that slides in the guide groove instead of a complicated gear wheel, the structure can be greatly simplified and the number of parts can be reduced. Manufacturing efficiency can be improved and cost can be reduced.

In particular, since the guide pin is biased in the direction of the guide groove by the biasing means, the accuracy of the depth of the guide groove for ensuring a certain clearance, the accuracy of the press-fitting depth of the guide pin with respect to the pin holding groove, etc. This eliminates the need for management and facilitates these processing operations. Therefore, it is possible to improve the working efficiency and reduce the working cost.

Moreover, since it is not necessary to attach a conventional gear to the rotor or the like, the attachment 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 pin 10 ... Eccentric collar (eccentric collar) 16a 16c ... Working chamber 17 ... Pin holding groove 20 ... Communication passage (passage portion) 21 ... Coil spring (biasing means)

Claims (5)

[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 slides along a trochoidal curved surface formed on the rotor, a drive shaft that penetrates through the housing and 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 guide means for guiding the rotational movement of the rotor between the rotor and the cover or the housing,
The guide means includes a guide groove formed along a trochoidal curved surface, a guide pin whose tip slides in the guide groove, and a biasing means for biasing the guide pin toward the bottom surface of the guide groove. A rotary pump characterized by the above. 2. The guide groove is formed on the inner side surface of the cover along the trochoid curved surface, while the guide pin is movable back and forth in a pin holding groove formed on one side surface near the top of the rotor. The rotary pump according to claim 1, wherein the biasing means is provided between the bottom surface of the pin holding groove and the base end surface of the guide pin while holding the same. 3. The guide groove is formed on the bottom surface of the recess of the housing along the trochoidal curved surface, while the guide pin is movable back and forth in a pin holding groove formed on the other side surface near the top of the rotor. The rotary pump according to claim 1, wherein the biasing means is provided between the bottom surface of the pin holding groove and the base end surface of the guide pin while holding the same. 4. The guide groove is formed on the outer peripheral side surface of the rotor along the trochoid curved surface, while the guide pin is moved forward and backward into a pin holding groove formed on the inner surface of the cover or the bottom surface of the recess of the housing. Hold it freely and
The rotary pump according to claim 1, wherein the urging means is provided between the bottom surface of the pin holding groove and the base end surface of the guide pin. 5. The rotary pump according to claim 1, wherein the biasing means is formed of a coil spring or a disc spring.