WO1982002227A1

WO1982002227A1 - Vane pump

Info

Publication number: WO1982002227A1
Application number: PCT/JP1981/000411
Authority: WO
Inventors: Kogyo Kk Kayaba
Original assignee: Hayashi Masumi; Kawasaki Kazunari
Priority date: 1980-12-27
Filing date: 1981-12-25
Publication date: 1982-07-08
Also published as: DE3152641A1; JPS648194B2; JPS57110787A

Abstract

A vane pump driven by the engine as a hydraulic pressure source for a vehicle power steering device. A cam ring is interposed between a pump housing (4) and a cover plate (6), a rotor with radially arranged vanes is rotated within the cam ring, a sintered plate (34) integrally formed with an annular groove (21) exerting high pressure against the base of the vane (1) and an exhaust port (12) is engaged with the end face of the pump housing (4) which makes direct contact with the rotor (2) and the vane (1). Thus, the castability of the pump housing (4) are improved, mechanical processing steps after casting are reduced, residual casting sand and burrs from drilling in the housing are eliminated, and the causes of improper operation of the flow control valve are eliminated.

Description

Details

m

Invention <Name

Bamboo Bon °

Field of technology

This invention is mainly for vehicles. O Regarding split-bump type bump pump suitable as a source of oil E for waste steering equipment o

This type of bump pump is generally used for vehicles, and is driven by a part of the output of the eno-non, and the hunting and oil operating force is assisted by the discharged E oil. It can remain use to actuate Ha ⁰ Wa over Shi Li down da. Ryo I by the change of E down Uz down rotating be sampled Ha ⁰ Wa

The bump should be c to prevent-from fluctuating.ヮ One ^α- control knob is provided to control the supply of pressurized oil to the cylinder almost constant.

Background technique

The pump pump, the cam ring, and the cover plate are divided into three parts, and a base pump that is assembled by fastening these together is described, for example, in the Patent Application. [Japanese Patent Application Laid-Open No. 56-69491] has been proposed by the present applicant. This is a bonus until then. It is possible to remove the side rate that was housed in the hollow part of the ノ 'ng, and the structure has been significantly simplified.

According to this vane pump, the pump housing accommodates a flow outlet that regulates the flow rate of the pump discharge oil. The pumps, housings and covers,

OMPI In the cam ring sandwiched between a plate and a cam ring, a vane is arranged and rotated by a pump shaft.

The vanes are arranged radially on the outer circumference of the rotor, receive centrifugal force due to the rotation of the rotor, and rotate while contacting the inner surface of the cam ring.

However, even if the power is working, it may not always be enough to touch the inner circumference of the cam ring, so embed the base of the unit, At the bottom of the guide formed on the α-ta, the Bonn: a part of the 7 ° discharge oil is guided to push the vane out of the tilling.

The inner peripheral surface of the force ring

— Irregularities are formed so that the pin can shrink and extend two times

This allows a large number of pump working chambers formed between the pin and the cam ring to expand and contract twice each time with a single tilling, and to shrink the working bubbles sucked in during expansion. The suction and discharge are sometimes performed by the suction and discharge ports, which are formed into a pump housing, and the suction and discharge ports formed by the vane side. Done.

The sliding contact surface of the aforementioned base one down moth I de groove Bonn ° C Uz in g to the high £ rather guide to the bottom of, ^[pi - motor and the Bruno L, cyclic Tao shallow circular Formed, the 9 'guide is always this ring-shaped on the side. And this ring was connected to the msc ft outboat inside the pump High E chamber filled with pressurized oil and communicating with some pores o

The hydraulic oil in the high-pressure chamber is controlled at a constant flow rate by the π-control valve, and c.残 Will flow to the cylinder, but the remainder will be guided again to the pump suction side and circulate. Therefore, a part of the high E oil flows from the pores into the annular groove, and the E force acts on the root of the blade so that the vane is pushed out to the outside of rotation. At this point, the pump housing is usually manufactured, but since the high E chamber inside the housing is molded into a core, sand may remain inside after the manufacturing. A]. In this case, since the high-pressure chamber only slightly communicates with the outside through a discharge port or the like, it is difficult to completely remove the residual sand. In addition, during machining of the pump housing, the pores are drilled from the sliding contact surface side of the vane by the drill and the reel. In some cases, this may not be possible.

If used as a product in this state, the residual sand and pallets will eventually be subjected to the pressure and fluid force of the high-pressure oil, and will separate from the corners and pores of the high-pressure chamber and become oily. Together, it flows from the high E room through the exit passage to the aforementioned π-control knob, and in some cases, the spout of the control knob. O Sliding parts か Engage in the corners and cause malfunctions o

Therefore, the present invention is intended to prevent malfunction of the 口 -valve, which is caused by residual sand and processing pallets.

〇ΜΗ The purpose is to provide a basic pump

It is another object of the present invention to provide a pump in which molding of a high-pressure chamber portion is technically easy and processing of pores and annular grooves is easy.

Disclosure of the invention

The present invention provides a pump with a cam ring between the pumping plate and the force plate, and a vane radially inside the cam ring. Rotating the arranged α-motors, the pump housing with the high-pressure chamber formed inside, and the cover: 7 ° rate, slides in direct contact with the α-motors and vanes A discharge port and a suction boat are provided on the contact surface, and the pump discharge oil is transferred to the bottom of the guide groove of the vane on the sliding contact surface of the pump bank. In the one in which the annular groove for guiding the portion is formed, the sintering surface of the pumping ring is fitted with a sintering plate in which the discharge boat and the annular life are previously shaped.

Therefore, since the sintered plate that reaches the high-pressure chamber after casting is fitted on the sliding surface of the pump house song, the forged shape of the pump: 7 ° flange is easily formed. ¾ i? However, the removal of sand for forming a high-pressure chamber can be easily and completely achieved. In addition, since the discharge plate and annular life of the sintering plate are pre-formed by the ^ -type processing, the number of processing steps for pump housing is small. In particular, since drilling is not required to form pores, no processing pallets are generated, and residual 篛 ^ is also increased. Malfunction of Renault * can also be prevented before it occurs.

OMPI BRIEF DESCRIPTION OF THE FIGURES

Fig.] To Fig. 6 are diagrams showing an example of a preferred bump pump according to the present invention. Fig. 1 is a side sectional view, and Fig. 2 is an external perspective view in an exploded state. , Fig. 3 is the rear view of the cover plate, Fig. 4 is the front view of the cam ring, Fig. 5 is the rear view, and Fig. 6 is the bonnet. O which is a front view of the housing

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred examples of the bump pump according to the present invention are shown in FIGS. 1 to 6. '

This pump is mainly used to re-rotate the rotor 2 and the π-ta 2 with the vane 1 as shown in Figs. 1 and 2. Pump shaft 3, Bon: ° Pump housing ⁴ , which supports shaft 3 so that it can be cultivated, ° — Cam ring 5, surrounding cam 2 and Cam With the link '5 and the rotor 2 interposed therebetween, the cap plate is fastened to the pump housing' 4 by a fastening means such as a port (not shown). G6.

As shown in FIG. — The pump discharge pressure and ^α acting on the groove base 8 are housed in a number of guides 7 formed radially on the groove 2 so as to move back and forth in the radial direction. Due to the centrifugal force when tilling, it is constantly pressed against the cam surface 9 of the cam link '5 (only one vane 1 is shown in Fig. 氨 2).

As shown in Fig. 5, the cam surface 9 of the cam link '5 has a substantially elliptical shape, and the vane 1 has a vane 1 on the cam surface 9. When the rotor 2 rotates while being pressed, the working chamber formed by the vane 1, the rotor 2 and the cam surface 9 expands twice every 回 rotation of the α-ta 2 (suction. Process) and reduction (discharge process).

A discharge boat 12 is opened in the bumper 4 at a position corresponding to a contact surface 11 with the vane 1 and just in a discharge stroke area of the working chamber.

Further, the sliding contact surface 11 is formed with a depression 18 facing a suction boat 29 described later, and an annular life 21. The annular groove 21 communicates with the high-pressure chamber 13 through the pore 19 to distribute the oil ε (pump discharge) from the high chamber 13 to the base 8 of the mouth 2. Then, press vane 1 against cam surface 9 as described above. '

At this time, the ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ The recessed portion 3 3 has a depth 達する from the outer wall of the high-pressure chamber 13, which represents a portion of the sliding contact surface 11, to the inside 13 Α of the high-pressure chamber 13, and the discharge port 12 is opposed to the depth 2. Distance between outer edges 12 A and 12 B I? Also have a slightly larger diameter D.

The circular recess 3 3 has a discharge port 12 that communicates with the high-pressure chamber 13, an annular groove 21, and a fine hole 1 9 that communicates the circular groove 21 with the high-pressure chamber 13. And a part 18A of the recess 18 facing the suction boat 29 is fitted with a plate 34 or 'formed by molding.

OMH

'Wipo. J The sintered plate 34 is attached to the circular concave portion 33 by the following method: Bon: ° Housing 4 is kept at room temperature or heated, and then sintered. It is cooled and press-fitted, but according to the so-called cold-fitting, an extremely strong bonding force is given in a normal state. Therefore, even if a high pressure is generated in the high pressure chamber 13 by the discharge oil, the pressing force against the sintered plate 34 is equal to the diameter of the sintered plate 34 and the diameter of the circular recess 33! Because it is received by the friction of the fitting surface of the fitting, it is a bonbon. Tensile acting on four ports (not shown) that fasten the cam ring 5 and the cap plate * 6 together to the housing '4]? High pressure between muring 5 and coater 2 or cam link '5 and canopy plate 6 and pump no, link' 4 Only the bending stress due to the pressure gradient in the leak region between and.

Also, instead of the above press-fitting, a sintered plate 34 is fitted into the circular recess 33, and an adhesive (for example, a female adhesive) is applied to this fitting portion. The adhesive may penetrate and harden into the fitting gap by the capillary phenomenon, so that the adhesive may be integrated with each other.

According to this, there is an advantage that no residual stress is generated at the fitting portion with respect to the pump housing 4 and the sintered plate 34 is not bent or deformed. In addition, management of processing and dimensional accuracy (fitting dimension management) becomes easier.

Inside the pump housing 4, a high-pressure chamber 13, which communicates with the discharge boat 12, is formed integrally with the core so as to be hollow. This button; 7. Housing 4 shows 21 more. 略-The 円筒ルパ — — — ルルル — — ルルルルルA passage 15 that communicates with the inlet side of the loop, and a passage 16A that communicates the excess oil return side of the flow valve inlet with the suction boat described later. And an oil suction port 17 that communicates with the passage 16A are formed.

On the other hand, as shown in FIG. 4, the cam ring 5 is connected to the pump housing 4 or a cover plate 6 to be described later as viewed from the front. They are formed in substantially the same outer shape.

In addition to the above-described cam surface 9, a passage 16 B which is different from the passage 16 A of the pump housing 4 penetrates the cam ring 5.

FIG. 4 shows a mating surface 22 with the capacitor plate 6. The mating surface 22 has a ridge-shaped seal surrounding the passage 16 B and the cam surface 9. A roller groove 23 is formed.

FIG. 5 shows a mating surface 24 with the pump housing 4, and a sealing groove 23 similar to that of FIG. 4 is formed on the mating surface 24. It has been done. In FIGS. 4 and 5, reference numeral 25 denotes a cap-plate 6 and a pump-ring 4 with a cam-ring 5 interposed therebetween. When the joints are tightened together, the port, the route through the route, the route hole, 26 sandwich the cam ring 5 between the pump housing 4 and the power plate 6. Knock bin 27 (see Fig. 2) for positioning the pin

Next, cover plate 6 is also shown in FIG. As shown in the figure, the suction port is placed on the sliding contact surface 11 with the vane 1 of the rotor 2 so as to communicate with the working chamber in the suction stroke area.

29 is formed. In addition, a passage 16C communicating with the passage 16B of the cam ring 5 is formed in the cover; The passage 16C bifurcates inside the capacitor plate 6 and communicates with a pair of suction boats 29.

The cover 6, as described above, is formed by narrowing the α-port 2 having the vane 1 and the cam ring 5 as described above. When tightened to the pump housing 4 with a filter, the cam ring 5 is oil-sealed to the seal torch 23 as shown in FIG. Nore (0 ring) 31 With the 1 installed, only between the force plate 6 and the pump No. ⁴ , ring ⁴ ! ? It is tightened together with.

The situation when the above-mentioned vane pump operates is as follows.

In other words, when the rotor 2 tilled with the rotation of the pump shaft 3, the vane 1 and the mouth data.2 and the cam surface 9 as well as the pump housing 4 and the cover: the working chamber defined by the facing sliding contact surfaces 11 of the 7 ° plate 6 expands and contracts as described above, and the discharge stroke and the suction stroke are controlled. Return.

The oil pushed out in the discharge stroke enters the high-pressure chamber 13 from the discharge port 12, and then flows from the high-pressure chamber 13 through the passage 15 through the flow port. Enter Leba Noreb.

Flow comments. In one level, we are well-known As a result, only oil controlled to a predetermined flow rate is supplied to the load side, and the remaining excess oil is released to passage 16A.

o

The oil that escaped to this passage 16 A

On the way to flow to 1 6 B, 1 6 C, oil re The one path data down click suction inlet 1 7 through to the (not shown) _e new oil merges with new oil forcesゝLuo Since the oil flow returned from the force is high and the E is relatively low, the so-called s-c. It positively flows into passage 16A and 16B due to the charging effect.

The oil that has joined at passage 16 or 16B reaches suction port 29 via passage 16C, during which a part of the oil flow velocity energy is reduced to £. As it is converted into energy, the oil flows through the suction boat 29 into the working room of the suction stroke.

The working chambers and passages 16A to 16C during the suction and discharge operations are fully oil-tight with two oil seals 31. Is done.

O PI

WIPO,

Claims

The scope of the claims

1. A plurality of vanes (1) arranged radially along the guide (7 :) of σ-ta (2), and a vane (1) slides on the cam surface (9). To be in contact. The cam ring (5) in which the cam (2) is housed, the cam ring (5), and the sliding surface (11) in contact with one end face of the mouth (2;). High EE room inside! 13) and a pump housing (4) having a α-control pulp, and a discharge chamber communicating with the high-pressure chamber (13) fitted in the sliding contact surface (11). 〔And concentric with the heaters [1 2) and °

A ring-shaped member (2 1) for guiding high pressure was molded at the base of (1).

Sintered plate (34), cam ring (5) and D

A power plate (6) having a contact surface (1 1 ·) contacting the opposite end surface of the motor (2), and a bon ° housing (4) and a force

Narrow the cam ring (5) between the plate (6)

It is featured that it is constructed from

Bump pump.

2. The ring of the sintered plate (34) * 21) is a pore

(19) is connected to Takasato (13)

The pump according to claim 1.

3. The tie plate (34) is the pump how's song (4)

Press-fit into a circular recess (33) shaped like

Claim 2 of claim 2.

4. The ^ plate (34) is the pump housing (4)

Is fitted into the circular recess (33) formed on the end face of

OMPI WIPO Seo Claim 2 which is fixed by an agent

One Wipo "