JP3715372B2 - Rotary type pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary pump used, for example, as an oil pump for automobile lubricating oil or hydraulic oil.
[0002]
[Prior art]
As is well known, there are various types of oil pumps, such as an internal gear pump and a plunger pump, that supply lubricating oil to an internal combustion engine for automobiles and hydraulic oil to power steering.
[0003]
By the way, in general, as an internal combustion engine for automatic use, in addition to a so-called reciprocating engine, a wankel type in which four strokes of suction, compression, expansion, and exhaust are continuously performed every time one rotation motion is performed while the rotor is in sliding contact with the trochoid curved surface. Are known (see Japanese Utility Model Publication No. 64-15726).
[0004]
The outline of this Wankel type rotary engine will be described. Side housings are provided on both sides of a rotary housing having a peritrochoid surface on the inner peripheral surface, and a substantially triangular rotor is formed inside the rotary housing. The rotor is housed so as to be rotatable while sliding on the curved surface, and three working chambers are formed between the outer peripheral surface of the rotor and the peritrochoid curved surface. In addition, a disc-shaped eccentric portion whose center is eccentric from the axis of the output shaft is integrally provided on a predetermined outer peripheral surface of the output shaft, which is a crankshaft penetrating both side housings. The inner peripheral surface of the rotor is supported on the outer periphery. Further, a small-diameter fixed gear is fixed to the inner peripheral surface of the output shaft through-hole of one side housing so as to face the working chamber, while a rotor gear that meshes with the fixed gear on one inner peripheral surface of the rotor is formed. Has been.
[0005]
The rotary housing has an intake port and an exhaust port formed in parallel on one side, and a pair of spark plugs attached to the opposite side.
[0006]
As the rotor rotates after the engine starts, the eccentric part and the output shaft rotate, and the rotor gear meshes with the fixed gear to rotate, so that the top of the rotor defines a peritrochoid curve that is the basic curve of the rotor housing. Power is transmitted to the output shaft while rotating. That is, as the rotor rotates, the intake port opens, the intake stroke begins, and the intake port is automatically closed when the volume of the two working chambers gradually increases to a maximum. Thereafter, the air-fuel mixture in the working chamber is compressed, ignited in the vicinity of the compression top dead center, and moves to the expansion stroke. Next, after passing through the expansion stroke, the exhaust port is opened, and after the exhaust stroke is completed, the process proceeds to the suction stroke again. As a result, the output shaft rotates three times for each rotation of the rotor, and power is transmitted to the output shaft.
[0007]
[Problems to be solved by the invention]
However, in the rotary engine, a separate rotor gear fixed to the rotor and a separate fixed gear fixed to the side housing are used as guide means for rotating the rotor along the trochoidal curve. The rotation guide of the rotor is performed by meshing the two gears having eccentric shafts. This complicates the structure of the entire guide means and requires a large number of parts. As a result, the manufacturing work efficiency decreases and the cost increases.
[0008]
In addition, high processing 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 increased. Furthermore, since a relatively large space for attaching each gear to the rotor and the side housing is required, the overall size and weight are increased.
[0009]
[Means for Solving the Problems]
The present invention has been devised in order to solve the problems of a rotary engine when, for example, an oil pump using the basic configuration of the rotary engine is put into practical use. A housing having a concave portion formed therein, a cover that closes one end opening of the concave portion, and a housing that is rotatably accommodated in the concave portion of the housing, each top portion being along a trochoidal curved surface formed on the inner peripheral surface of the concave portion A substantially triangular rotor that rotates in sliding contact, a drive shaft that passes through the housing and transmits rotational force to the rotor via an eccentric mechanism, and a plurality of rotors that are formed between the trochoidal curved surface and the rotor outer peripheral surface A rotary pump comprising: a working part; and a passage part for letting out the non-compressed fluid in one working room whose volume decreases during a compression stroke accompanying rotation of the rotor to the outside, Between the over motor and the cover or housing, provided with a guide means for guiding the rotational movement of the rotor, the means within said guide, which is formed so as to communicate between a plurality of said working chamber along a trochoid curved guide It is characterized by comprising a groove and a guide pin whose tip end slides in the guide groove.
[0010]
According to a second aspect of the present invention, the guide groove is formed on the inner side surface of the cover along the trochoidal curved surface, and the guide pin is formed in a pin holding hole formed on one side surface near the top of the rotor. It is characterized by holding.
[0011]
According to a third aspect of the present invention, the guide groove is formed on the bottom surface of the recess along the trochoidal curved surface, and the guide pin is formed in a pin holding hole formed on the other side surface near the top of the rotor. It is characterized by holding.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first embodiment of a rotary pump according to the present invention, a housing 1 fixed to a cylinder block or the like of an internal combustion engine, and a flat bolt 3 fixed to one end of the housing 1; A cover 2 that closes one end opening of an eyebrow-shaped recess 1b formed inside the housing 1, a drive shaft 4 that is inserted through the through holes 1a, 2a at the center of the housing 1 and the cover 2; A substantially triangular rotor 5 is provided which is rotatably accommodated in an interior defined by a recess 1 b inside the housing 1 and a cover 2.
[0014]
In the housing 1, the inner peripheral surface of the recess 1 b is formed as a cocoon-shaped trochoid curved surface 6, and a cylindrical projection 7 is integrally provided on the outer surface of the inner peripheral portion opposite to the cover 2. The cover 2 is formed in the same rectangular shape as the housing 1 and has a thickness that does not lower the rigidity even if a guide groove 8 described later is formed.
[0015]
The drive shaft 4 is directly connected to a crankshaft of an internal combustion engine (not shown) so as to rotate at a one-to-one rotation ratio with the crankshaft, and an eccentric collar 10 as an eccentric mechanism is driven on the outer peripheral surface. The shaft 4 is fixed to the groove on the outer peripheral surface of the shaft 4 by a key 11 disposed in the longitudinal direction, and a driving pulley 12 is fixed to the tip portion 4a by a bolt 13 screwed from the axial direction. Further, the gear portion 14 is fixed to the base end side step portion 4 b 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 a rotational force to the drive shaft 4 via a timing belt. Yes. A seal member 15 is interposed between the protruding portion 7 of the housing 1 and the cylindrical portion 12 a of the drive pulley 12.
[0016]
As shown in FIG. 2, the eccentric collar 10 includes a cylindrical portion 10a fitted on the outer peripheral surface of the drive shaft 4, and an eccentric plate 10b integrally formed on the outer peripheral surface of the cylindrical portion 10a on the drive pulley 12 side. The center P is eccentric from the axis X of the drive shaft 4 by ε. The cylindrical portion 10a has front and rear end portions extending to the insertion hole 1a of the housing 1 and the insertion hole 2a of the cover 2, and a front end portion at the edge of the cylindrical portion 12a of the drive pulley 12 and a rear end portion. Are in contact with the end face of the gear portion 14 and positioned in the axial direction. The eccentric plate 10b is provided with a plurality of large and small holes H in the circumferential direction for weight reduction and weight balance.
[0017]
The thickness of the rotor 5 is set slightly smaller than the width of the recess 1b of the housing 1, and three working chambers 16a, 16b, 16c are provided between the outer surface between the tops 5a-5c and the trochoidal surface 6. While being formed, each top part 5a-5c draws a peritrochoid curve, and makes a rotational movement, always slidingly contacting the trochoid curved surface 6. FIG. A circular hole is formed in the center of the rotor 5 as shown in FIG. 1, and an 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, A rotational force is transmitted from the eccentric plate 10b to the rotor 5 through the inner peripheral surface 5d.
[0018]
Further, as shown in FIG. 2, the housing 1 has a lower suction port 18 and an upper discharge port 19 communicating with the recess 1b formed in one side wall so as to penetrate the substantially horizontal direction. Inside the other side wall opposite to the discharge ports 18, 19, there are a first working chamber 16a whose volume decreases during the compression stroke, and a second working chamber 16b adjacent to the first working chamber 16a in the direction of rotation of the rotor 5. A communication passage 20 is formed as a passage portion communicating with each other.
[0019]
That is, the communication path 20 is bent in a substantially U-shape, and the one end opening 20a is separated with the top 5b slidingly contacting the trochoidal curved surface 6 on the other side wall as the rotor 5 rotates. The other end opening 20b is formed so as to communicate with the second working chamber 16b. Further, the maximum volume value of the communication passage 20 is the volume of the first working chamber 16a when one top 5b closes the other end opening 20b, as shown in FIG. 1, from the maximum volume value of the first working chamber 16a. The volume value is set equal to or larger than the volume value obtained by subtracting the value.
[0020]
Between the cover 2 and the rotor 5, guide means for rotating and guiding the rotor 5 along the trochoidal curved surface 6 is provided. The guide means includes an endless guide groove 8 formed on the outer peripheral side of the inner side surface 2b of the cover 2, three pin holding holes 17 formed on one side surface 5e of the rotor inner side 2b, The guide pin 9 is held in each pin holding hole 17.
[0021]
As shown in FIGS. 1 and 2, the guide groove 8 has a semicircular cross-sectional shape, and is notched in an eyebrows shape along the trochoid curved surface 6. Further, the pin holding hole 17 has a columnar shape, 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-5c and the center P of the rotor 5, and in the vicinity of the tops 5a-5c. And is opposed to the guide groove 8. Further, the metal guide pin 9 has a base end portion 9 a press-fitted and fixed in the three pin holding holes 17, and a tip end portion 9 a slidably fitted in the guide groove 8.
[0022]
Therefore, according to the present embodiment, the input / output path is opposite to that of the four-stroke rotary engine, and when the drive shaft 4 is rotationally driven via the drive pulley 12, the eccentric collar 10 is also rotated synchronously and the outer peripheral surface and the rotor inner periphery are rotated. The rotational force is transmitted to the rotor 5 through the surface 5d. For this reason, the rotor 5 is smoothly guided while each guide pin 9 of the guide means slides in the guide groove 8 and rotates along the trochoid curve. At this time, for example, the lubricating oil is sucked into the first working chamber 16 a communicating with the suction port 18, and the lubricating oil is filled into the first working chamber 16 a having the maximum volume due to the rotation of the rotor 5, and is compressed as it is. Transition to the process. Then, at the same time when the compression stroke starts (volume start of the first working chamber 16a starts), the first working chamber 16a communicates with the second working chamber 16b through the communication path 20, so that the lubricating oil in the first working chamber 16a is It flows into the 2nd working chamber 16b, and the volume reduction accompanying the transfer of the 1st working chamber 16a is permitted. Thereafter, the lubricating oil that has entered the expansion stroke and filled in the second working chamber 16b is pumped by the rotational force of the rotor 5 into the discharge port 19 that communicates with the second working chamber 16b. As a result, a series of pumping operations are performed smoothly.
[0023]
As described above, according to this embodiment, the rotary type oil pump can be put into practical use by adding a slight improvement to the basic structure of the rotary engine, so that the volumes of the working chambers 16a to 16c are increased. Accordingly, the discharge amount per rotation of the rotor 5 can be increased, and the pump efficiency can be improved. That is, since the maximum volume of each of the working chambers 16a to 16c is larger than that of other inscribed gear pumps or the like, the discharge amount per time is increased. As a result, if the pump capacity is the same as that of the conventional oil pump, the entire structure can be made sufficiently small, and the pump can be made compact and light.
[0024]
In addition, 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.
[0025]
Further, in this embodiment, each guide pin 9 held in the guide groove 8 and the pin holding hole 17 instead of the gear is configured as the guide means of the rotor 5, so that the structure can be greatly simplified and the number of parts can be reduced. I can plan. For this reason, it is possible to improve the manufacturing work efficiency of the guide means and reduce the cost.
[0026]
Furthermore, since the guide means is configured by using the three guide pins 9 between the cover 2 and the rotor 5, a space for attaching a gear as in the prior art is not required at all, thereby reducing the size of the pump. And lighter.
[0027]
3 and 4 show a second embodiment of the present invention, in which a guide groove 8 of guide means is formed on the bottom surface of the concave portion 1b of the housing 1 along the trochoidal curved surface 6, and the rotor 5 facing the guide groove 8 is shown. Three pin holding holes 17 are formed on the other side surface 5f of the concave portion 1b, and the base end portion 9a of each guide pin 9 is press-fitted and fixed, and the tip end portion 9b is slidably inserted into the guide groove 8. It is a thing.
[0028]
Therefore, in this embodiment, not only the same effects as in the first embodiment can be obtained, but also the guide groove 8 along the trochoidal curved surface 6 is formed in the housing 1 in which the trochoidal curved surface 6 is formed, and the rotor 5 is provided here. Since the guide pins 9 fixed in advance are fitted, the accuracy of the mounting position of the rotor 5 with respect to the housing 1 at the time of assembling each component becomes good, and the rotation failure of the rotor 5 due to the shift of the shaft center is prevented. In addition, a knock pin with high processing accuracy for preventing such rotation failure of the rotor 5 becomes unnecessary. As a result, the machining efficiency can be improved and the cost can be reduced as compared with the first embodiment.
[0029]
Further, in the third embodiment, the guide groove of the guide means is formed on the one side surface 5e or the other side surface 5f side of the outer peripheral portion side of the rotor 5, while the plurality of pin holding holes are formed on the inner side surface 2b of the cover 2 or the housing. It is also possible to form it on the bottom surface of the recess 1b and to fix the guide pin here.
[0030]
【The invention's effect】
As is apparent from the above description, according to the rotary pump according to the present invention, the rotary pump using the basic structure of the rotary engine can be put into practical use, and the rotor guiding means can be used. Because it is composed of a guide groove and a guide pin that slides in the guide groove instead of a complicated gear, the structure can be greatly simplified and the number of parts can be reduced. Cost can be reduced.
[0031]
In addition, since high processing accuracy of the guide means is not required, it is possible to improve the processing efficiency and reduce the processing cost.
[0032]
In addition, since there is no need to attach a conventional gear to the rotor or the like, the installation space is completely eliminated, and the pump can be reduced in size and weight.
[0033]
Further, according to the second aspect of the invention, in addition to the above-described effects, centering at the time of assembling the rotor 5 and the like with respect to the housing is facilitated, and the mounting position accuracy is improved. As a result, it is possible to prevent the rotation failure of the rotor due to the deviation of the shaft center and to eliminate the need for a knock pin or the like with high machining accuracy, so that the machining and assembly work efficiency can be improved and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a rotary pump of the present invention.
2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a vertical cross-sectional view showing a second embodiment of the present invention.
4 is a cross-sectional view taken along line BB in FIG.
[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 ... Rotors 5a-5c ... Top part 6 ... Trochoid curved surface 8 ... Guide groove 9 ... Guide pin 10 ... Eccentric color (eccentric color)
16a to 16c ... working chamber 17 ... pin holding hole 20 ... communication path (passage part)

Claims (3)

A housing having a substantially eyebrows-shaped recess formed therein;
A cover for closing one end opening of the recess;
A substantially triangular rotor that is rotatably accommodated in a recess of the housing, and each top portion is slidably rotated along a trochoidal curved surface formed on the inner peripheral surface of the recess;
A drive shaft that is disposed through the housing and transmits a rotational force to the rotor via an eccentric mechanism;
A plurality of working chambers formed between the trochoid curved surface and the rotor outer peripheral surface;
A rotary pump comprising a passage portion for discharging an incompressible fluid in one working chamber whose volume is reduced during a compression stroke accompanying rotation of the rotor to the outside,
Between the rotor and the cover or the housing is provided guide means for guiding the rotational movement of the rotor,
The guide means is composed of a guide groove formed so as to communicate between the plurality of working chambers along a trochoid curved surface, and a guide pin whose tip portion slides in the guide groove. Type pump.   The guide groove is formed on the inner side surface of the cover along the trochoid curved surface, and the guide pin is held in a pin holding hole formed on one side surface near the top of the rotor. Item 2. The rotary pump according to Item 1.   The guide groove is formed along the trochoid curved surface on the bottom surface of the recess of the housing, and the guide pin is held in a pin holding hole formed on the other side surface near the top of the rotor. Item 2. The rotary pump according to Item 1.

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