Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
  • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Definitions

• This invention relates to a gear pump used for an oil pump or the like, and even if a gear is generated at a high speed rolling of the gear.
• the durability and speed of the gear pump were improved by preventing the occurrence of pitting on the outlet port wall of the cover. It is suitable for oil pumps of internal combustion engines. Background technology
• the conventional gear pump is installed on the cover f side with respect to the discharge port d installed on the pump body e side.
• the discharge port d thus obtained has an unbalanced discharge port shape with a reduced depth.
• This cavity (static pressure drops and bubbles are generated) (1) Phenomenon) also occurs on the pump body e and the cover f side, but since the discharge boat d on the pump body e side is deep, the discharge side No bubbles are generated because bubbles are pushed down by the flow coming in from there, and the bubbles do not collapse near the wall surface.
• the discharge port d on the side of the cover f is so shallow that bubbles collapse near the wall, causing a pitching on the wall of the discharge port d. There was a defect to be produced.
• the present invention eliminates the drawbacks of such conventional gear pumps, and allows the ejection port on one side of the canopy to be driven by the cavitation.
• the purpose of the present invention is to provide a gear pump in which the occurrence of pitching is prevented. Disclosure of the invention
• the present invention provides a pair of gears which are connected to each other in a pump body, and these gears are turned around.
• the above pump is used in a gear pump in which the inhaled oil is discharged from the suction port to the discharge port. Due to the depth of the deep discharge port provided in the main body, it was installed on the force side to close the opening of the pump body. The width of the discharge port with a small depth is increased.
• FIG. 1 is a longitudinal sectional view of the gear pump
• FIG. 2 is a sectional view taken along the line II-II of FIG.
• Figures 3 and 4 are operational illustrations
• Figure 5 is an illustration of a conventional gap pump
• Figure 6 is a cross-sectional view along the line VI-V] in Figure 5
• Fig. 7 or Fig. 9 is a diagram for explaining the operation. Best form to carry out the invention
• FIG. 1 One embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.
• FIG. 1 One embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.
• ⁇ is the pump body, and a pair of gears 2 and 3 that are connected to each other inside are supported by the surface itself, and one of the gears is used. 2 is connected to an unillustrated drive source and rotated in the direction of the arrow (see Fig. J).
• the above-mentioned discharge bottle 5 is deep on the pump body 1 side, and closes the opening of the pump body 1.
• the width A of the discharge port 5 on the 16 side is the same as that of the canopy. It is larger than the width B of the discharge port 5! AB; It is formed so that the discharge port 5 on the cover 6 side opens first.
• the action will be described with reference to Figs. 3 and 4, and the sealing between the teeth 2a and 3a of each gear 2 and 3 is performed by turning the gears 2 and 3.
• the collected oil is conveyed to the discharge port 5 side and discharged to the discharge port 5, but the width A of the discharge port 5 on the canopy 6 side is the pump.
• the discharge port 5 on the main body 1 Since the discharge port 5 on the main body 1 is formed larger than the width B of the discharge port 5 in advance, the discharge port 5 on the cano 6 side becomes the discharge port 5 The opening is opened between the teeth 2a and 3a that have reached immediately before, and the outlet port 5 is higher in pressure than the oil closed between the teeth 2a and 3a. As shown by the arrow X in FIGS. 3 and 4, the oil flows in, and then the hole is drawn from the discharge boat 5 on the pump body 1 side by the arrow Y. Flows in as shown in As a result, the oil flowing in from the discharge port 5 on the cano — 6 side and the oil flowing in from the pump body 1 side are the same as the canon.
• this invention can be used for cavitating gears at high speed.
• the width of the discharge port shallower on one side is the same as the width of the discharge port deeper on the pump body side.
• the discharge port on one side is opened first, and the power is large. Bubble collapse occurs at a position further away from the wall of the discharge port on the side of the bubble, so a pitching is made on the wall of the discharge port on the cano side. Can be prevented from occurring. Therefore, the durability of the gear pump and the effect of increasing the speed of the gear pump can be further improved, and the oil pump of the internal combustion engine is effective. It is very well suited for use in pumps.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11719240

Family Applications (1)

Country Status (3)

Citations (2)

• 1989
  • 1989-01-31 JP JP939589U patent/JPH02101086U/ja active Pending
• 1990
  • 1990-01-22 AU AU49443/90A patent/AU4944390A/en not_active Abandoned
  • 1990-01-22 WO PCT/JP1990/000069 patent/WO1990008899A1/ja unknown

Patent Citations (2)

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