CN201786648U

CN201786648U - Gear pump

Info

Publication number: CN201786648U
Application number: CN2010205439582U
Authority: CN
Inventors: 吴伟民
Original assignee: ZHEJIANG KAISITE HYDRAULIC CO Ltd
Current assignee: ZHEJIANG KAISITE HYDRAULIC CO Ltd
Priority date: 2010-09-27
Filing date: 2010-09-27
Publication date: 2011-04-06
Anticipated expiration: 2020-09-27

Abstract

The utility model relates to a pumping device, especially to a gear pump with different pressure angles of tooth faces on two sides of the gear and solving problems that pressure angles of tooth faces on two sides of the gear of the conventional gear pump are the same and the pump delivery for one time is small. The device includes a pump body with a cavity; pump covers are respectively arranged on two ends of the pump body; a driving gear and a driven gear which are mutually engaged are disposed in the pump body, characterized in that the tooth face of one side where the driving gear and the driven gear are engaged is a work face; the tooth face of the other side is a non-work face; the work face pressure angle is 20.5-22.8 DEG and the non-work face pressure angle is 14.6-19 DEG. The utility model increases the pumping efficiency and has low noise; and the pressure balance system on two sides of a floating bush reduces drainage from the gear end face.

Description

Gear pump

Technical field

The utility model relates to a kind of pumping installations, the different gear pump of particularly a kind of gear two lateral tooth flank pressure angles.

Technical background

The pressure angle α of gear is meant that at two pitch circle points of tangency places, the folded acute angle of common tangent of the common normal line of two tooth curves and two pitch circles also claims working pressure angle, and little pressure angle wheel tooth intensity is little, and bearing capacity is less; And the large pressure angle gear, the tooth intensity of gear is big more, though bearing capacity is higher, in the load increase of the identical situation lower bearing of transmitting torque.The pressure angle of traditional gear pump two lateral tooth flanks is identical, and pressure angle is generally about 20 degree, and the single pump output is less, and at the gear engagement place because the backlash plot ratio changes excessively, cause noise bigger.

As Patent Office of the People's Republic of China's disclosed CN2916191Y patent application on June 27th, 2007, during being called, name presses gear pump, this device is installed driving shaft and driven axle on housing, be positioned at driving shaft on a section of housing gear is installed, gear with gear engagement is installed on driven axle, form a pair of gear pair, the import and the outlet of material are set on housing, it is characterized in that: the empiecement that annular is set on the housing corresponding to gear face by Cuprum alloy or steel work.The pressure angle of gear two lateral tooth flanks of this gear pump is identical, and the single pump output is little.

Summary of the invention

The purpose of this utility model is at existing gear pump gear two problem that the lateral tooth flank pressure angle is identical, the single pump output is little, provides a kind of gear two lateral tooth flank pressure angles different gear pumps.

The technological scheme that its technical problem that solves the utility model adopts is: a kind of gear pump, comprise the pump housing that has inner chamber, pump housing two ends are respectively equipped with pump cover, be provided with intermeshing driving gear and driven gear in the pump housing, driving gear and the driven gear stressed lateral tooth flank that is meshing with each other is a working surface, opposite side is a non-working surface, and the face pressure angle is 20.5 °～22.8 °, and the non-working surface pressure angle is 14.6 °～19 °.Gear non-working surface pressure angle is little, makes gear non-working surface one side do certain excision, has increased the volume between adjacent two teeth, has increased the single pump output, the pumping efficiency height.Working gear surface pressure angle is big simultaneously, and the strength of gear teeth is strengthened, and has remedied the little influence to the strength of gear teeth of non-working surface pressure angle.Simultaneously, because the backlash increases, gear engagement place backlash plot ratio changes little, because the noise that plot ratio variation in backlash produces is little.

As preferably, the excision of the root portion of described non-working surface forms the undercut groove, has increased the backlash, has increased the single pump output, has reduced the variation of engagement place backlash plot ratio, reduces noise.

As preferably, be respectively equipped with floating buss between the end face of described driving gear and driven gear and the pump cover, be provided with seal ring between floating buss and the pump cover.Reduce the earial drainage of gear face, and avoid gear pump outlet side and suction side earial drainage between floating buss and pump cover.

As preferably, described seal ring is 8 fonts.The inboard of 8 font seal rings is corresponding with the gear pump suction side, and the 8 font seal rings outsides is corresponding with the gear pump outlet side, and the cavity between floating buss and the pump cover is separated, and avoids the suction side of gear pump and outlet side from earial drainage between floating buss and the pump cover.

As preferably, the floating buss of described gear pump outlet side is provided with relief groove, and relief groove is communicated with the floating buss both sides.Make floating buss pressure at both sides balance, avoid that excesssive gap causes earial drainage between gear face and the floating buss, simultaneously because the obstruct of 8 font seal rings can not produce earial drainage between floating buss and the pump cover.

As preferably, described seal ring cross section is step-like.

As preferably, described floating buss is provided with the gear-bearing of driving gear and driven gear.Driving gear shaft and driven gear shaft are installed in respectively on the gear-bearing, and driving gear shaft passes pump cover and reaches the pump cover outside.

As preferably, described face pressure angle is 21.5 °.

As preferably, described non-working surface pressure angle is 16 °.

The utility model has adopted the gear teeth face structure of two pressure angles, has both guaranteed the strength of gear teeth, has increased the single pump output again, improves pumping efficiency; Engagement place backlash plot ratio changes little, and noise is little; The pressure balancing system of floating buss both sides has reduced the gear face earial drainage.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model.

Fig. 2 is the utility model gear engagement schematic representation.

Fig. 3 is the utility model flank of tooth pressure angle schematic representation.

Fig. 4 is the ring structure schematic representation behind the removal pump cover.

Among the figure: 1. the pump housing, 2. pump cover, 3. driving gear, 4. driven gear, 5. floating buss, 6. seal ring, 7. working surface, 8. non-working surface, 9. undercut groove, 10. relief groove, V. cavity volume, α. pressure angle.

Embodiment

Also in conjunction with the accompanying drawings the utility model is further specified below by specific embodiment.

Embodiment: the gear pump of a kind of pair of pressure angle, as shown in Figures 1 to 4.The pump housing 1 is for having the housing of inner chamber, the pump housing 1 both ends of the surface connect, both ends of the surface are respectively equipped with pump cover 2, be provided with intermeshing driving gear 3 and driven gear 4 in the inner chamber of the pump housing 1, two gear width unanimities, be provided with floating buss 5 between the end face of driving gear 3 and driven gear 4 and the pump cover 2, be provided with seal ring 6 between floating buss 5 and the pump cover 2, also be provided with gear-bearing in the floating buss 5, driving gear shaft and driven gear shaft are installed in respectively on the gear-bearing, and an end of driving gear shaft passes pump cover 2 and reaches outside the pump cover 2.

As Fig. 2, shown in Figure 3, during work, driving gear 3 and the driven gear 4 stressed lateral tooth flank that is meshing with each other is a working surface 7, the flank of tooth of opposite side is a non-working surface 8, working surface 7 is different with the pressure angle α of non-working surface 8, the pressure angle of working surface 7 is 21.5 °, and the pressure angle of non-working surface 8 is 16 °, and the flank of tooth tooth root place cut-out material of non-working surface 8 forms undercut groove 9.Because the pressure angle of non-working surface 8 is little and be provided with undercut groove 9, so the backlash between adjacent two teeth is big, the single pump output increases; Simultaneously, working surface 7 pressure angles are big, and the intensity that strengthens gear is to remedy the influence of non-working surface 8 structures to the strength of gear teeth.As shown in Figure 2, when driving gear 3 and driven gear 4 have two groups of adjacent teeth to mesh simultaneously, the place, backlash of two groups of teeth forms a cavity volume V of sealing relatively, when driving gear 3 and driven gear 4 are rotated further, cavity volume V will be compressed, because non-working surface 8 pressure angles are little and the structure of undercut groove 9, the compression ratio of cavity volume V is diminished, the noise that has produced when having reduced the cavity volume compression, traditional relatively gear pump, the noise of this structure can reduce more than 7%.

As shown in Figure 4, the pumping from right to left of figure middle gear pump, seal ring 6 is a figure-8 structure, 8 font seal rings 6 are setovered to the right, the outside of 8 font seal rings 6 is corresponding with the outlet side of gear pump, and offering relief groove 10 conducting floating busses 5 both sides, the inlet side of 8 font seal rings, 6 inboard corresponding teeth wheel pumps near on the floating buss 5 of gear pump outlet side.When gear pump is not worked, the elasticity of seal ring 6 makes floating buss 5 be close to gear face, when gear pump is worked, the pressure of gear pump outlet side is higher than the pressure of inlet side, high-pressure delivery liquid enters to form between gear face and the floating buss 5 and lubricates, relief groove makes the pressure balance of floating buss 5 both sides simultaneously, guarantee that thickness that gap between gear face and the floating buss 5 remains at one deck oil film is lubricated and can cause earial drainage, and the conveying liquid that the obstruct of seal ring 6 has guaranteed gear pump outlet side and inlet side can be between floating buss 5 and pump cover 2 earial drainage.

Claims

1. gear pump, comprise the pump housing that has inner chamber, pump housing two ends are respectively equipped with pump cover, be provided with intermeshing driving gear and driven gear in the pump housing, it is characterized in that: driving gear and the driven gear stressed lateral tooth flank that is meshing with each other is a working surface, opposite side is a non-working surface, and the face pressure angle is 20.5 °～22.8 °, and the non-working surface pressure angle is 14.6 °～19 °.

2. gear pump according to claim 1 is characterized in that: the root portion excision of described non-working surface forms the undercut groove.

3. gear pump according to claim 1 and 2 is characterized in that: be respectively equipped with floating buss between the end face of described driving gear and driven gear and the pump cover, be provided with seal ring between floating buss and the pump cover.

4. gear pump according to claim 3 is characterized in that: described seal ring is 8 fonts.

5. gear pump according to claim 3 is characterized in that: the floating buss of described gear pump outlet side is provided with relief groove, and relief groove is communicated with the floating buss both sides.

6. gear pump according to claim 3 is characterized in that: described floating buss is provided with the gear-bearing of driving gear and driven gear.

7. gear pump according to claim 1 and 2 is characterized in that: described face pressure angle is 21.5 °.

8. gear pump according to claim 1 and 2 is characterized in that: described non-working surface pressure angle is 16 °.