CN2864158Y

CN2864158Y - Improved gear oil pump

Info

Publication number: CN2864158Y
Application number: CN 200520133815
Authority: CN
Inventors: 胡远祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-09
Filing date: 2005-11-09
Publication date: 2007-01-31
Anticipated expiration: 2015-11-09

Abstract

The utility model discloses an improved gear oil pump comprising a driving gear and a driven gear arranged through bearing in the pump body. On the side tooth-face of crest of each tooth of the driving gear and the driven gear, an unloading concave groove that is connected with the tooth crest is arranged. The unloading concave grooves on two side tooth faces are symmetric in staggered way. In inner side of the rear cover of the pump body, a pressure disk cavity and a hydraulic cavity with positioning shoulder are arranged. In the pressure disk cavity, an automatic compensating pressure disk whose circumference has oil seal is fit arranged, the front face of the pressure disk fits with the end of shaft bushing. At back of the pressure disk, a spring is fit arranged. The oil drain orifice of the oil pump is connected with the hydraulic cavity through the oil channel. The utility model can reduce inner leakage and wear of pumps, and increase volumetric efficiency and service life of them.

Description

Improved gear oil pump

Technical field

The utility model belongs to the improvement of involute cylindrical straight gear shape external gear type oil pump, particularly improved gear 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, 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, 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 gear oil pump, can reduce 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 gear oil pump, be included in the driving gear and the driven gear that pass through Bearing Installation in the pump housing, on the flank of tooth of the tooth top both sides of each tooth of driving gear and driven gear, the relief grooves that communicates with tooth top is being set respectively, be positioned at the relief grooves mutual dislocation symmetry on two lateral tooth flanks, the platen chamber is being set in the bonnet inboard of the pump housing and is having the hydraulic pressure cavity of location shoulder block, in the platen chamber, cooperate the automatic compensation platen that periphery is equipped with oil sealing is installed, match with the end face of sleeve body in the front of platen, in the cooperation of the back side of platen spring is installed, the oil drain out of oil pump communicates with hydraulic pressure cavity by oily passage.

Because relief grooves of the present utility model is arranged on the flank of tooth of tooth top both sides of driving gear and each tooth of driven gear, and relief grooves communicates with tooth top, when gear engagement forms dead volume, for alleviating entrap phenomenon is by the compensating groove off-load on tooth top two lateral tooth flanks of tooth, guaranteed that not only volumetric efficiency does not reduce, and the compensating groove of having stopped existing oil pump makes the phenomenon of pulling fitting surface in dirt wedging gear face in the oil and the glade plane space between the front and rear covers, improve the volumetric efficiency of oil pump, prolonged the working life of oil pump.Owing to platen chamber and hydraulic pressure cavity are being set in the bonnet inboard of the pump housing, in the platen chamber, cooperate the platen that periphery is equipped with oil sealing is installed, the back side cooperation of platen is installed with spring, and the oil drain out of oil pump communicates with hydraulic pressure cavity by oily passage.When the oil pump loaded-up, the oil drain out of oil pump is introduced hydraulic pressure cavity by oily passage with pressure oil, and the oil pressure of hydraulic pressure cavity promotes the end face compression fit of platen and sleeve body, and the axial clearance of oil pump is compensated automatically; When the zero load rotation of oil pump, because hydraulic pressure cavity does not have pressure oil to promote platen, reduced axial wearing and tearing to oil pump, reduced the internal leakage of pump, prolonged the working life of oil pump.The spring that cooperate to install at the platen back side, its spring pressure are set to the control oil pump and do not produce axial runout and get final product.

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 B-B sectional structure schematic representation of Fig. 1;

Fig. 4 is the perspective view of the relief grooves that is provided with on driven gear tooth top two lateral tooth flanks;

Fig. 5 is the perspective view of the relief grooves that is provided with on the flank of tooth of driving gear tooth top both sides;

Fig. 6 is the positive perspective view of sleeve body;

Fig. 7 is a sleeve body back side perspective view.

Embodiment

A kind of improved gear oil pump, as Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, be included in oil-feed port 11 and oil drain out 12 are being set on the pump housing 1, in the pump housing 1, pass through the driving gear 3 and the driven gear 4 of Bearing Installation, on the flank of tooth of the tooth top both sides of each tooth of driving gear 3 and driven gear 4 relief grooves 14 that communicates with tooth top is being set respectively, relief grooves 14 is a rectangular recess, and the length of relief grooves 14 is 0.5-4mm, width is 0.3-3mm, and the degree of depth is 0.1-1mm.Be positioned at the relief grooves 14 mutual dislocation symmetries on two lateral tooth flanks, the platen chamber is being set in bonnet 2 inboards of the pump housing and is having the hydraulic pressure cavity 7 of location shoulder block, in the platen chamber, cooperate the automatic compensation platen 8 that periphery is equipped with oil sealing 10 is installed, oil sealing 10 is installed in the oil seal groove of platen 8 periphery settings, match with the end face of sleeve body 6 in the front of platen 8, in the cooperation of the back side of platen 8 spring 9 is installed, the two ends of spring 9 are separately fixed in the spring seat of the spring seat of platen 8 and bonnet 2, and the oil drain out 12 of oil pump communicates with hydraulic pressure cavity 7 by oily passage 13.Operating oil pressure produces the area of pressure greater than the area 20-30% of operating oil pressure in the pump to sleeve body 6 generation pressure to platen 8 back sides.As Fig. 6, shown in Figure 7, in the oil seal groove 15 that on the cylinder of the sleeve body 6 of symmetry, is provided with oil sealing 5 is installed, the cylinder of sleeve body 6 cooperates with the pump housing 1 bore seal by oil sealing 5.Its good seal performance has avoided the part high pressure oil to the drawback that low pressure area leaks, and has reduced internal leakage, has improved the volumetric efficiency of oil pump.

Claims

1, a kind of improved gear oil pump, be included in the pump housing (1) interior driving gear (3) and driven gear (4) by Bearing Installation, it is characterized in that: on the flank of tooth of the tooth top both sides of each tooth of driving gear (3) and driven gear (4), the relief grooves (14) that communicates with tooth top is being set respectively, be positioned at relief grooves (14) the mutual dislocation symmetry on two lateral tooth flanks, the platen chamber is being set in bonnet (2) inboard of the pump housing and is having the hydraulic pressure cavity (7) of location shoulder block, in the platen chamber, cooperate the automatic compensation platen (8) that periphery is equipped with oil sealing (10) is installed, match with the end face of sleeve body (6) in the front of platen (8), in the cooperation of the back side of platen (8) spring (9) is installed, the oil drain out of oil pump (12) communicates with hydraulic pressure cavity (7) by oily passage (13).

2, improved gear oil pump according to claim 1 is characterized in that: in the oil seal groove (15) that is provided with on the cylinder of the sleeve body (6) of symmetry oil sealing (5) is installed, the cylinder of sleeve body (6) cooperates with the pump housing (1) bore seal by oil sealing (5).

3, improved gear oil pump according to claim 1 is characterized in that: relief grooves (14) is a rectangular recess, and the length of relief grooves (14) is 0.5-4mm, and width is 0.3-3mm, and the degree of depth is 0.1-1mm.

4, improved gear oil pump according to claim 1 is characterized in that: operating oil pressure produces the area of pressure greater than the area 20-30% of operating oil pressure in the pump to sleeve body (6) generation pressure to platen (8) back side.