CN2906137Y

CN2906137Y - Improved external gear oil pump

Info

Publication number: CN2906137Y
Application number: CN 200620116882
Authority: CN
Inventors: 胡远祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-17
Filing date: 2006-05-17
Publication date: 2007-05-30
Anticipated expiration: 2016-05-17

Abstract

Disclosed is an oil pump with improved external gear. Discharge oil ducts respectively communicated with sucking, pressing oil chamber are arranged at the dead volume high-low pressure transition part of the sliding face on the end part of the shaft sleeve body; a pressure plate chamber with inclined plane is provided at the inner wall of the back cover and a pressure plate with inclined plane at back is cooperatively installed in the pressure plate chamber; adjusting clearance of the pressure plate is kept at the top in the pressure plate chamber; an adjusting bolt is installed in a through hole provided at the bottom of the back cover and the screw rod of the bolt is movable cooperated with the through hole; a clip piece fixed on the cover back and penetrated into the through hole matches with the clip slot on the screw rod; one side of the square nut installed on the screw rod of the bolt matches with the concave pit on the back plane of the pressure plate and the other side matches with the guiding slot on the inner wall of the back cover pressure plate chamber. The utility model can increase the working stability of the gear, reduce the inner leakage of the pump and the wearing of the pump, and as well as increase the volumetric efficiency of the pump, prolongs the service life.

Description

Improved external gear type oil pump

Technical field

The utility model belongs to the improvement of involute cylindrical straight gear shape external gear type oil pump, particularly improved external gear type oil pump.

Background technique

Gear oil pump commonly used at present is in order to guarantee the proper functioning of gear oil pump, make oil sucting cavity be separated and not be communicated with tooth engagement Line of contact by tooth with pumping cavity, just require gear that certain overlap coefficient is arranged, because overlap coefficient is greater than 1, when a pair of gear teeth as yet not before the disengage from, the a pair of gear teeth in back just begin to enter engagement, between them, form a close cavity, be called dead volume, because dead volume its size in two pairs of gear engagement processes changes, when volume reduces, can cause the rapid rising of oil pressure and produce instantaneous pressure and impact, and when volume increases, can form parital vacuum, this entrap phenomenon produces noise when making gear oil pump work, and volumetric efficiency reduces, and influences the stable working and the life-span of gear.For alleviating the harm that entrap phenomenon causes, generally be the lotus groove of on side plate or axle sleeve, starting discharging.Its deficiency is that the off-load groove has reduced volumetric efficiency, also makes in the glade plane space of dirt between off-load groove wedging gear face and front and rear covers in the oil and pulls fitting surface, causes output flow to reduce.Existing gear oil pump is in order to guarantee reasonably axially fit up gap, and the way that reduces internal leakage is the end face mounting spring that adopts at the axle sleeve matrix, makes the automatic compensating axial clearance of floating buss.But when gear pump during in zero load work, spring causes certain axial wearing and tearing to the pressure of axle sleeve to pump.

Summary of the invention

The purpose of this utility model is to provide a kind of improved external gear type oil pump, can improve the stationarity of working gear, reduces the internal leakage of pump, reduces the wearing and tearing of pump, improves the volumetric efficiency of pump, increases the service life.

The purpose of this utility model is achieved in that a kind of improved external gear type oil pump, be included in the pump housing and driving gear and driven gear be installed by sleeve body and axle sleeve, on the slip surface of the positive end of sleeve body, be positioned at the dead volume height, the low pressure area transition position is being provided with respectively and suction, the drain charge oil duct that pumping cavity communicates, platen chamber with inclined-plane is being set in the bonnet inboard, the platen cooperation that the back side has the inclined-plane is installed in the platen chamber, match with the ear end face of sleeve body in the front of platen, the inclined-plane of platen matches with the inclined-plane in platen chamber, the adjusting gap of platen is left on top in the platen chamber, in the through hole that the bonnet bottom is provided with, the adjusting bolt is installed, the mast of adjusting bolt and through hole are movingly, the card that is packed on the bonnet and gos deep in the through hole matches with draw-in groove on the mast, regulate the sides nut of installing on the screw rod of bolt, the one side matches with the pit at the platen back side, and its opposite side matches with guiding groove on the bonnet platen cavity wall.

Because the utility model is positioned at the drain charge passage that dead volume height nip transition position is being provided with respectively and the suction pumping cavity communicates on the slip surface of the positive end of sleeve body.When gear oil pump is worked, when two pairs of adjacent gear teeth mesh simultaneously, between them, form dead volume, at this moment, on the slip surface of the positive end of sleeve body, the drain charge oil duct that is positioned at dead volume height nip transition position is communicated with oil sucting cavity with pumping cavity, the high pressure oil that produces in dead volume carries out drain charge by the drain charge oil duct.Reduce the high pressure of the instantaneous generation of dead volume and the parital vacuum of formation, improved the stationarity of working gear.The area that the oil inlet hole of the utility model drain charge oil duct and oil drainage hole take on the slip surface of the positive end of sleeve body is very little, has guaranteed the specified output flow of gear pump, thereby has improved volumetric efficiency.Because the oil inlet hole and the oil drainage hole aperture of drain charge oil duct take the very little area of slip surface for a short time, thereby reduced the chance that well cuts embeds gear face and sleeve body slip surface, guaranteed that gear face contacts with the good of sleeve body slip surface, make output flow stable, improved the working efficiency of pump.In the platen chamber of pump housing bonnet, cooperate the platen that has the inclined-plane is installed, and leave certain adjusting gap.When the wearing and tearing of sleeve body end clearance, when the end clearance increased, rotatable adjusting bolt carried out the adjusting play.Since regulate on the tightening latch of bolt draw-in groove be packed in pump housing bonnet on and go deep into the interior card of through hole and match, rotate when regulating bolt, its screw rod promotes sides nut drive platen and moves up along the guiding groove in the platen chamber, make platen be adjacent to the sleeve body ear end face by the inclined-plane that cooperatively interacts, reduced the gear face gap, thereby reduced oily leakage loss, improved the volumetric efficiency and the working efficiency of pump, prolonged working life.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a perspective view of the present utility model; Fig. 2 is the A-A sectional structure schematic representation of Fig. 1; Fig. 3 is the perspective view of sleeve body; Fig. 4 is the B-B sectional structure schematic representation of Fig. 3.

Embodiment

A kind of improved external gear type oil pump, as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, be included in the pump housing 1 and driving gear 5 and driven gear 6 be installed by sleeve body 2 and axle sleeve 3, be positioned at the high and low nip transition position of dead volume on the slip surface of sleeve body 2 positive ends the drain charge oil duct 10 that communicates with suction, pumping cavity is being set respectively, the aperture of drain charge oil duct 10 is 0.5-3mm.Platen chamber with inclined-plane is being set in pump housing bonnet 4 inboards, platen 7 cooperations that the back side has the inclined-plane are installed in the platen chamber, match with the ear end face of sleeve body 2 in the front of platen 7, the inclined-plane of platen 7 matches with the inclined-plane in platen chamber, the adjusting gap of platen 7 is left on top in the platen chamber, vertical adjusting gap of platen 7 is 10-20mm, and the horizontal adjusting play of platen 7 is 1-2mm.The oil leab 12 that is communicated with driving gear 5 axle heads and driven gear 6 axle heads is being set on the front of platen 7.Be installed with in the through hole that pump housing bonnet 4 bottoms are provided with and regulate bolt 9, the mast of regulating bolt 9 and through hole are packed on the pump housing bonnet 4 and the card 11 that gos deep in the through hole matches with draw-in groove on the mast movingly, make adjusting bolt 9 relative positionings.Oil sealing 10 is installed in the oil seal groove of mast top cylinder setting.Regulate the sides nut of installing on the screw rod of bolt 98, the one side matches with the pit at platen 7 back sides, and its opposite side matches with guiding groove on the pump housing bonnet 4 platen cavity walls.Regulate the screw rod and sides nut 8 transition fit of bolt 9.Six side's pits on the exterior edge face of regulating bolt 9 masts, being provided with.Regulate bolt 9 with rotating with the supporting special spanner of interior six side's pits.

Claims

1, a kind of improved external gear type oil pump, be included in the pump housing (1) and driving gear (5) and driven gear (6) be installed by sleeve body (2) and axle sleeve (3), it is characterized in that: on the slip surface of the positive end of sleeve body (2), be positioned at the dead volume height, the low pressure area transition position is being provided with respectively and suction, the drain charge oil duct (10) that pumping cavity communicates, in bonnet (4) inboard the platen chamber with inclined-plane is being set, platen (7) cooperation that the back side has the inclined-plane is installed in the platen chamber, match with the ear end face of sleeve body (2) in the front of platen (7), the inclined-plane of platen (7) matches with the inclined-plane in platen chamber, the adjusting gap of platen (7) is left on top in the platen chamber, in the through hole that bonnet (4) bottom is provided with, be installed with and regulate bolt (9), the mast of adjusting bolt (9) and through hole are movingly, be packed in that bonnet (4) is gone up and the card (11) that gos deep in the through hole matches with draw-in groove on the mast, regulate the sides nut of installing on the screw rod of bolt (9) (8), the one side matches with the pit at platen (7) back side, and its opposite side matches with guiding groove on bonnet (4) the platen cavity wall.

2, improved external gear type oil pump according to claim 1 is characterized in that: the aperture of drain charge oil duct (10) is 0.5-3mm.

3, improved external gear type oil pump according to claim 1 is characterized in that: vertical adjusting gap of platen (7) is 10-20mm, and the horizontal adjusting play of platen (7) is 1-2mm.

4, improved external gear type oil pump according to claim 1 is characterized in that: the oil leab (12) that connection driving gear (5) axle head and driven gear (6) axle head are being set on the front of platen (7).

5, improved external gear type oil pump according to claim 1 is characterized in that: oil sealing (10) is installed in the oil seal groove of mast top cylinder setting.

6, improved external gear type oil pump according to claim 1 is characterized in that: the screw rod and sides nut (8) transition fit of regulating bolt (9).