JPH09296783A - Rotary type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a rotor guiding means structure while improving pump efficiency. SOLUTION: In a rotary type pump provided with a rotor 5, whose plural top parts are rotated while sliding on a trochoid face 6 in a cocoon-shaped recess part 1b in a housing 1, and three operation chambers formed between the trochoid curved face 6 and a rotor outer circumferential face, a capacity of each of the operation chambers is varied according to the rotation of the rotor 5 by means of a driving shaft 4 and an eccentric collar 10, and then, a pumping action is carried out A guiding means, which rotationally guides the rotor 5 along the trochoid curve, is constructed of a cylindrical guide ring 8 fixed in a through hole 2a hole edge of a cover 2 and a guide face 9 which is formed on the inner circumferential face 5d, to which rotation of the eccentric collar 10 is transmitted, in the rotor 5 and is supported freely slidably on the inner circumference part 8a outer circumferential face of the guide ring 8.

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]

SUMMARY OF THE INVENTION 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 above is formed on the housing and the cover, a housing whose one end opening is closed by a cover, a substantially triangular rotor whose top is slidably rotated along a trochoidal curved surface formed on the inner peripheral surface of the housing. And a plurality of working chambers formed between the trochoid curved surface and the outer peripheral surface of the rotor, the rotary shaft of the rotor being disposed through the through hole and transmitting the rotational force to the rotor through an eccentric collar. And a guide means for guiding, and a rotary type pump that performs a pumping action by changing the volume of the working chamber with the rotation of the rotor,
The guide means has a guide ring fixed to a hole edge of a through hole of the housing or a cover, and a transmission surface formed in the center of the rotor and transmitting a rotational force from the eccentric collar. And a guide surface slidably supported on the outer peripheral surface of the.

According to a second aspect of the present invention, the guide ring has an inner cylindrical shape, and is formed so as to slide and guide the guide surface of the rotor on the outer peripheral surface of the inner peripheral portion facing the working chamber. Is characterized by.

Therefore, according to the present invention, when the eccentric collar is rotated by the rotational driving of the drive shaft, the rotor is rotationally moved by the rotational force from the eccentric collar, and each vertex is rotated along the trochoid curved surface. At this time, the guide surface of the rotor slides while being guided and supported by the outer peripheral surface of the guide ring. Therefore, the rotor is smoothly guided by the guide ring.

[0012]

1 to 3 show an embodiment of a rotary pump according to the present invention, a housing 1 fixed to a cylinder block of an internal combustion engine, and a flat bolt at one end of the housing 1. A cover 2 fixed by 3 to close an opening of one end of an eyebrow-shaped recess 1b formed inside the housing 1, and a drive inserted through through holes 1a and 2a formed in the central portions of the housing 1 and the cover 2. A substantially triangular rotor 5 rotatably provided inside a shaft 4, a recess 1b inside the housing 1, and a cover 2.
And

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 of an internal combustion engine (not shown) 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 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 on the outer peripheral surface of the eccentric plate 10b of the eccentric collar 10, Rotational force is transmitted from the eccentric plate 10b.

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 that 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 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 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 rotational movement of the rotor 5. This guide means is formed on the guide ring 8 fixed to the hole edge of the through hole 2a of the cover 2 and on the right half in FIG. 1 of the inner peripheral surface 5d of the circular hole of the rotor 5, and the outer peripheral surface of the guide ring 8 is formed. The guide surface 9 is slidably supported by 9a.

As shown in FIG. 2, the guide ring 8 has a substantially cylindrical shape, the axial length of which is set sufficiently larger than the thickness of the cover 2, and the inner peripheral portion 8a of the eccentric collar 10 is formed. It faces the inside of the recess 1b through an annular notch 10c formed on the outer peripheral surface. The outer peripheral surface of the inner peripheral portion 8a has an eccentric collar 10
The guide surface 9 is slidably supported at the minimum thickness portion 10d. In addition, the guide ring 8
The outer peripheral surface of the is coated with a sliding friction reducing material such as fluorine.

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 driven to rotate via the drive pulley 12, the eccentric collar 10 also rotates synchronously and the eccentric plate 10b. The rotational force is transmitted to the rotor 5 via the outer peripheral surface of the rotor 5 and the inner peripheral surface 5d of the rotor 5. For this reason, the rotor 5 is smoothly guided while the guide surface 9 is in sliding contact with the guide ring 8 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, the compression process starts (first
At the same time when the volume of the working chamber 16a starts to decrease), 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 can be transferred to the second working chamber 1a.
6b to allow the volume reduction accompanying the transition of the first working chamber 16a. After that, the lubricating oil filled in the second working chamber 16b after shifting to the expansion stroke is
To the discharge port 19 which communicates with the rotor 5. 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 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.

Further, in the present embodiment, the guide ring 8 and the guide surface 9 are used as the guide means of the rotor 5 instead of the gear, so that the smooth rotation guide action of the rotor 5 can be obtained. The structure of the guide means can be greatly simplified and the number of parts can be reduced. Therefore, manufacturing work efficiency can be improved and cost can be reduced. Further, the conventional space for mounting the gears is not necessary at all, which allows the pump to be made smaller and lighter.

Moreover, since the sliding friction reducing material is applied to the outer peripheral surface of the guide ring 8, a smoother guiding action can be obtained and abrasion is prevented.

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. In addition, the guide ring 8
Can be fixed to the hole edge of the through hole 1a of the housing 1. In this case, the guide surface 9 is formed on the pulley 12 side of the circular hole of the rotor 5.

[0027]

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 guide means of the rotor is configured with a simple guide ring and guide surface instead of a complicated gear, which greatly simplifies the structure and reduces the number of parts.As a result, manufacturing work efficiency and cost are improved. The cost can be reduced.

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 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;

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 showing the operation of this embodiment.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1 showing the operation of this embodiment.

[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 ring 9 ... Guide surface 10 ... Eccentric collar (eccentric collar) 16a ~ 16c ... Working chamber

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 plurality of working chambers formed between the trochoid curved surface and the rotor outer peripheral surface, and a drive shaft penetratingly arranged in a through hole formed in the housing and the cover and transmitting a rotational force to the rotor through an eccentric collar. And a guide means for guiding the rotational movement of the rotor, the rotary pump performing a pumping action by changing the volume of the working chamber in accordance with the rotation of the rotor, wherein the guide means is the housing or A guide ring fixed to the hole edge of the through hole of the cover and a transmission surface formed in the center of the rotor and transmitting the rotational force from the eccentric collar, and slidable on the outer peripheral surface of the guide ring. A rotary pump characterized by being configured with a guide surface supported. 2. The guide ring has an inner cylindrical shape, and is formed so as to slide and guide the guide surface of the rotor on the outer peripheral surface of the inner peripheral portion facing the working chamber. Rotary type pump.