CN203867885U

CN203867885U - Oil pump gear

Info

Publication number: CN203867885U
Application number: CN201420240100.7U
Authority: CN
Inventors: 何宗宪
Original assignee: SHODA MOTOR COMPONENTS INDUSTRY (ZHEJIANG) Co Ltd
Current assignee: Cheng Tian auto parts industry (Zhejiang) Limited by Share Ltd
Priority date: 2014-05-09
Filing date: 2014-05-09
Publication date: 2014-10-08
Anticipated expiration: 2024-05-09

Abstract

The utility model provides an oil pump gear, and relates to the technical field of gear pumps. The oil pump gear comprises an oil pump gear main body, wherein the oil pump gear main body comprises a gear shaft and a gear assembled on the gear shaft; both ends of the gear shaft are arranged on an oil pump machine through bearings; the gear comprises a first end surface and a second end surface; when the gear and the gear shaft are in assembly, the first end surface faces the gear shaft; a radial first through hole is formed in the gear shaft positioned on the side of the first end surface; a second through hole communicated with the first through hole is formed in the axial direction in one end, positioned on the side of the second end surface, of the gear shaft; a mark blind hole is formed in the first end surface. According to the oil pump gear, the mark blind hole is further formed in the first end surface of the gear, and the mark blind hole can simply face the gear shaft when the gear is assembled on the gear shaft in order to ensure the assembly validity.

Description

A kind of oil pump gear

Technical field

The utility model relates to gear pump technical field, specifically, relates to a kind of oil pump gear.

Background technique

Gear pump is a critical component that is used for carrying flowing medium in machinery hydraulic system, and it relies on the high speed rotary motion fed sheet of a media of a pair of oil pump gear.In the time that a pair of oil pump gear is made high speed engagement driving in the pump housing, along with contact points changes, oil sucting cavity swept volume increase meshing zone in, the pressure decreased in space and produce parital vacuum, oil in oil sump enters the inlet port in oil pump low pressure area under atmospheric effect, produces oil suction effect; In pumping cavity, because the oil pump gear teeth progress into engagement, its swept volume reduces, and produces force feed effect to pressure piping.

In prior art, the gear shaft of oil pump gear is cylindric, and oil pump gear comprises gear and gear shaft, and gear shaft is cylindric, and both sides adjacent with gear on gear shaft can running in bearings.Oil pump gear is the operation element of gear pump most critical, and by gear engagement, gear pump could be exported required certain pressure and the medium of flow.Because oil pump gear requires different from general mechanical drive gear job specification, when oil pump gear engagement, its sideshake and bottom clearance are all very little, the pressure medium of output is higher again, its suffered load that interacts is very large, deflection deformation that gear shaft produces when work, pressure medium is higher, and distortion is just larger.Worsen because distortion causes gear shaft and bearing supporting place mated condition, impel the aggravation of gear pump component abrasion, produce abnormal sound, dielectric leakage, pressure drop, utilization efficiency reduces, and shortens operating life.The continuous rotation of gear simultaneously, what the alternating stress of generation can continue acts on gear shaft, and long-term work meeting makes material production fatigue and causes axle journal fracture to cause gear pump to be scrapped.In the prior art, oil pump gear has ensured the normal work of motor, by the transmission between gear, has guaranteed the consistent work of each system coordination of motor.The function that the reasonable Arrangement of gear directly has influence on other part is used.The oil pump gear of prior art cannot accurately measure the parameters of oil pump gear in manufacture process, oil pump gear with the assembly process of gear shaft in also can frequently there is anti-loaded situation.

Summary of the invention

Content of the present utility model is to provide a kind of oil pump gear, and it can overcome certain or some defect of prior art.

According to a kind of oil pump gear of the present utility model, it comprises oil pump gear body, and oil pump gear body comprises gear shaft and be assemblied in the gear on gear shaft, and gear shaft two ends are arranged on oil pump machine by bearing; Gear comprises the first end face and the second end face, and when gear and gear shaft assembling, first end is facing to gear shaft; Gear shaft is positioned at the first end face side and is provided with the first through hole radially, and one end that gear shaft is positioned at the second end face side is provided with the second through hole being communicated with the first through hole vertically; The first end face is provided with a mark blind hole.

Gear shaft of the present utility model inside is provided with through hole, this through hole can be communicated with the gear shaft that is positioned at gear both sides, because gear pump does not have outer lubricating oil filling, the design of through hole can allow liquid material force to pass through, and is to pass through carried material to remove the gear shaft bearing of oilgear the second end face side.On the first end face of the utility model gear, be also provided with mark blind hole, in the time that gear is assembled on gear shaft, only need be by mark blind hole towards gear shaft, guarantee the correctness of assembling.

As preferably, the diameter of the first through hole is 4mm, and the diameter of the second through hole is also 4mm.

As preferably, mark blind hole is circular hole, and its diameter is 2mm, and the degree of depth is 1mm.

In a preferred embodiment of the present utility model, mark blind hole can be that diameter is the circular hole that 2mm, the degree of depth are 1mm, and such design makes mark blind hole in playing mark, also guarantee the intensity of gear.

As preferably, the surface of gear shaft is provided with one deck carburized case, and the thickness of carburized case is M, wherein 0.3mm≤M≤0.6mm.

As preferably, the surface of gear is provided with one deck carburized case, and the thickness of carburized case is N, wherein 0.3mm≤N≤0.4mm.

The material of gear shaft of the present utility model and gear is 20CrMnTi, their surface is also equipped with carburized case, the existence of carburized case makes gear shaft and gear surface layer have high hardness and wear resistance, and the core of gear shaft and gear is still keeping the original toughness of 20CrMnTi material and plasticity, thereby make gear shaft and gear in possessing preferably toughness and plasticity, also possess higher hardness and wear resistance preferably, increase the working life of gear shaft and gear, make gear shaft that the utility model provides and gear better for oil pump machine.The thickness of the case-carbonizing layer of the utility model gear shaft can be 0.3mm～0.6mm, the thickness of the case-carbonizing layer of the utility model gear can be 0.3mm～0.4mm, in actual production manufacture process, after experiment comparative analysis repeatedly, find, when the thickness of gear shaft and gear surface carburized case is during in above-mentioned scope, can obtain preferably hardness and toughness.

Brief description of the drawings

Fig. 1 is the schematic diagram of oil pump gear body in embodiment 1;

Fig. 2 is the schematic diagram of embodiment's 1 middle gear.

Embodiment

For further understanding content of the present utility model, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.

Embodiment 1

As shown in Figure 1 and Figure 2, be a kind of oil pump gear of the present embodiment, it comprises oil pump gear body 100, and oil pump gear body 100 comprises gear shaft 110 and is assemblied in the gear 120 on gear shaft 110, and gear shaft 110 two ends are arranged on oil pump machine by bearing; Gear 120 comprises the first end face 121 and the second end face 122, and when gear 120 assembles with gear shaft 110, the first end face 121 is towards gear shaft; Gear shaft 110 is positioned at the first end face 121 sides and is provided with the first through hole 111 radially, and one end that gear shaft 110 is positioned at the second end face 122 sides is provided with the second through hole 112 being communicated with the first through hole 111 vertically; The first end face 121 is provided with a mark blind hole 210.

In the present embodiment, the diameter of the first through hole 111 is 4mm, and the diameter of the second through hole 112 is also 4mm.Mark blind hole 210 is circular hole, and its diameter is 2mm, and the degree of depth is 1mm.The surface of gear shaft 110 is provided with one deck carburized case, and the thickness of carburized case is 0.3mm.The surface of gear 120 is provided with one deck carburized case, and the thickness of carburized case is 0.4mm.

When gear 120 and the gear shaft 110 of the present embodiment assembles, the first end face 121 is towards gear shaft 110, because the first end face 121 is provided with mark blind hole 210, thereby has stopped gear 120 by the generation of anti-loaded phenomenon, reduces fault rate, increases work efficiency.

Embodiment 2

A kind of oil pump gear of the present embodiment, itself and embodiment's 1 difference is: the thickness of the case-carbonizing layer of gear shaft 110 is 0.6mm; The thickness of the case-carbonizing layer of gear 120 is 0.3mm.

Embodiment 3

A kind of oil pump gear of the present embodiment, itself and embodiment's 1 difference is: the thickness of the case-carbonizing layer of gear shaft 110 is 0.5mm; The thickness of the case-carbonizing layer of gear 120 is 0.35mm.

Below schematically the utility model and mode of execution thereof are described, this description does not have restricted, and shown in accompanying drawing is also one of mode of execution of the present utility model, and actual structure is not limited to this.So, if those of ordinary skill in the art is enlightened by it, in the situation that not departing from the utility model creation aim, without the creationary mode of structure similar to this technological scheme and the embodiment of designing, all should belong to protection domain of the present utility model.

Claims

1. an oil pump gear, comprise oil pump gear body (100), oil pump gear body (100) comprises gear shaft (110) and is assemblied in the gear (120) on gear shaft (110), and gear shaft (110) two ends are arranged on oil pump machine by bearing; It is characterized in that: gear (120) comprises the first end face (121) and the second end face (122), when gear (120) assembles with gear shaft (110), the first end face (121) is towards gear shaft; Gear shaft (110) is positioned at the first end face (121) side and is provided with the first through hole (111) radially, and one end that gear shaft (110) is positioned at the second end face (122) side is provided with the second through hole (112) being communicated with the first through hole (111) vertically; The first end face (121) is provided with a mark blind hole (210).

2. a kind of oil pump gear according to claim 1, is characterized in that: the diameter of the first through hole (111) is 4mm, and the diameter of the second through hole (112) is also 4mm.

3. a kind of oil pump gear according to claim 1, is characterized in that: mark blind hole (210) is circular hole, and its diameter is 2mm, and the degree of depth is 1mm.

4. a kind of oil pump gear according to claim 1, is characterized in that: the surface of gear shaft (110) is provided with one deck carburized case, and the thickness of carburized case is M, wherein 0.3mm≤M≤0.6mm.

5. a kind of oil pump gear according to claim 1, is characterized in that: the surface of gear (120) is provided with one deck carburized case, and the thickness of carburized case is N, wherein 0.3mm≤N≤0.4mm.