CN203756518U - Helical planetary gear pump - Google Patents

Abstract

The utility model relates to a helical planetary gear pump. The gear pump includes a central wheel, several planetary wheels, an inner pump body, an outer pump body, an input shaft, a positioning sleeve, a sliding bearing, an O-ring, etc.; Both the center wheel and the planetary wheels are arranged on a fixed axis. The center wheel is driven by the input shaft and supported on the inner pump body through a positioning sleeve. The planetary wheels are supported on the inner pump body through sliding bearings. 1. Several independent input and output oil chambers are formed on the sides of the sliding bearings on both sides; all the oil suction chambers on the inner pump body communicate with the oil suction ports on the outer pump body, and all the oil discharge chambers communicate with the oil discharge ports on the outer pump body . The utility model has the advantages that the radial force of the gear pump basically cancels each other, can better maintain the assembly clearance, greatly improves the stressed state of the gear and the bearing, reduces wear and improves the service life. At the same time, due to the increased number of inlet and outlet oil chambers, the displacement of the gear pump is increased several times.

Description

Helical planetary gear pump

technical field

The utility model relates to a gear pump in a hydraulic system, in particular to a gear pump used for oil replenishment, lubrication and cooling, oil source control, etc. Helical planetary gear pump in oil circuit system.

Background technique

Among various types of positive displacement oil pumps, gear pumps have the advantages of simple structure, easy manufacture, low cost, light weight, reliable operation, and less sensitivity to oil pollution, and are widely used. However, due to the radial imbalance of the general-purpose spur gear pump, the bearings and gears are seriously worn, the assembly clearance is gradually increased, the leakage is serious, the volumetric efficiency is low, the service life is low, and the noise is large. However, in the existing straight-toothed planetary gear pump, the oil trapping phenomenon cannot be solved well, and the noise is relatively large. With the rapid development of my country's economy and the gradual improvement of technology, the performance requirements of products are getting higher and higher. High efficiency, energy saving and low noise have become the development direction of products. Therefore, high-end mechanical products urgently need a large displacement, low noise, high performance gear pump.

Contents of the invention

The purpose of this utility model is to provide a helical planetary gear pump used in various mechanical products, especially oil circuit systems that require large displacement fluid delivery, in view of the shortcomings in the above-mentioned prior art.

The purpose of this utility model can be achieved through the following technical measures:

The helical planetary gear pump of the present utility model includes an inner and an outer pump body that are fitted together in a close fit manner, both of which are helical cylindrical gears and a center wheel arranged in a fixed-axis manner and at least two planets arranged around the center wheel The center wheel is driven by the input shaft, which is supported in the inner pump body by the center wheel positioning sleeve I and the center wheel positioning sleeve II located at both ends; the two ends of the planetary wheel are respectively passed through the sliding bearing and the sliding bearing outer casing I 1. Sliding bearing jacket II is installed in the inner pump body; several independent oil suction chambers and oil discharge chambers are formed between the center wheel, the planetary wheel, and the inner wall of the inner pump body, and each oil suction chamber is connected with the oil suction chamber on the outer pump body. The ports communicate with each other, and each oil discharge cavity communicates with the oil discharge port on the outer pump body.

In the utility model, there is an oil hole for bearing lubrication on the sliding bearing, and the oil hole communicates with the oil discharge chamber (high pressure chamber) of the gear pump; a seal for sealing is installed between the inner and outer pump bodies. O-rings.

The central wheel and the planetary wheel described in the utility model are helical cylindrical gears with a small helix angle of 4 to 5°, and the tooth shape modification design is done. Head clearance design.

In the gear pump of the utility model, if the number of teeth of the center gear is an integral multiple of the number of planetary wheels, the radial force can be completely offset; if it is not an integral multiple, the radial force can also be basically offset, which improves the stress on the gears and bearings state, reduces wear and improves life; reasonable design is made for the total coincidence degree of helical spur gears, and the center wheel adopts a small top clearance design, which effectively improves the phenomenon of oil trapping, reduces flow pulsation, and reduces noise The gears are designed with a small helix angle, so the axial force generated by the meshing is relatively small. The positioning sleeves at both ends of the center wheel and the sliding bearings at both ends of the planetary wheel are made of special wear-resistant materials. The center wheel and planetary wheels adopt carburizing and quenching heat treatment process. , the hardness is high, so the axial wear is very small, but the transmission stability is better than that of straight teeth, and the load capacity has also been improved; there are oil holes for bearing lubrication connected with the high pressure chamber on the sliding bearing, which further improves the bearing capacity. life. An oil inlet and an oil outlet are respectively opened on both sides of each pair of gear meshes on the inner pump body, and all the oil inlets are combined into one oil inlet on the outer pump body, and all the oil outlets are combined into one oil outlet. Both the inner pump body and the outer pump body use three-dimensional solid modeling, and are designed through CAE optimization, and the structure is reasonable.

The beneficial effects of the utility model are as follows:

The utility model has the advantages that the radial force of the gear pump basically cancels each other, improves the stressed state of the gear and the bearing, reduces wear and improves the service life. The total coincidence degree of the helical cylindrical gear is reasonably designed, and the center wheel is designed with tooth shape modification and small top clearance, which effectively improves the phenomenon of oil trapping, reduces flow pulsation, and reduces noise. The gears are designed with a small helix angle, so the axial force generated by the meshing is relatively small. The positioning sleeves at both ends of the center wheel and the sliding bearing jackets at both ends of the planetary wheels are made of special wear-resistant materials. The center wheel and planetary wheels adopt carburizing and quenching heat treatment process. The hardness is higher, so the axial wear is very small, but the transmission stability is better than that of straight teeth, and the load-carrying capacity has also been improved. At the same time, due to the increased number of inlet and outlet oil chambers, the displacement of the gear pump is increased several times. It is a gear pump with large displacement, low noise and high performance, and it can be arranged vertically according to the application occasion.

Description of drawings

Fig. 1 is the front view of the utility model helical planetary gear pump.

Fig. 2 is a sectional view of A-A in Fig. 1 .

Fig. 3 is a view of the sliding bearing in Fig. 1 .

FIG. 4 is a side view of FIG. 3 .

Serial numbers in Figures 1 to 4: 1 Oil suction port, 2 Outer pump body, 3 O-ring, 4 Inner pump body, 5 Sliding bearing outer casing Ⅰ, 6 Sliding bearing, 7 Planetary gear, 8 Input shaft, 9 Center wheel positioning sleeve Ⅰ, 10 center wheel, 11 oil discharge port, 12 center wheel positioning sleeve Ⅱ, 13 sliding bearing jacket Ⅱ, 14 oil discharge cavity, 15 oil suction cavity, 16 oil hole.

Detailed ways

The utility model is described in further detail below in conjunction with embodiment (accompanying drawing):

As shown in Figures 1 and 2, the symmetrical helical planetary gear pump of the present invention includes inner and outer pump bodies 4 and 2 that are fitted together in a close fit manner, both of which are helical cylindrical gears arranged in a fixed-axis manner. The center wheel 10 and at least two planetary wheels 7 arranged around the center wheel, the center wheel 10 is driven by the input shaft 8, the input shaft 8 is supported by the center wheel positioning sleeve I9 and the center wheel positioning sleeve II12 at both ends of the inner pump Inside the body 4; the two ends of the planetary wheel 7 are respectively installed in the inner pump body 4 through the sliding bearing 6, the sliding bearing outer casing I5, and the sliding bearing outer casing II13; Several mutually independent oil suction chambers 15 and oil discharge chambers 14 are respectively formed between them, and each oil suction chamber 15 communicates with the oil suction port 1 on the outer pump body, and each oil discharge chamber 14 communicates with the oil discharge port 11 on the outer pump body.

In the utility model, the sliding bearing 6 is provided with an oil hole 16 for bearing lubrication, and the oil hole communicates with the oil discharge chamber 14 (high pressure chamber) of the gear pump; O-ring 3 for sealing.

The central wheel and the planetary wheel described in the utility model are both helical cylindrical gears with a small helix angle of 4 to 5°, and the tooth shape modification design is done. The central wheel adopts a small top clearance of about 0.14mm design.

The working principle of the utility model is as follows:

The input shaft 8 drives the center wheel 10 to rotate, and the center wheel 10 meshes with several planetary wheels 7 at the same time, the gear teeth are disengaged and the sealing working volume increases, forming a partial vacuum, and the oil in the oil tank passes through the outer pump body under the action of the external atmospheric pressure. The oil suction port 1 enters each oil suction cavity 15 of the inner pump body. At the same time, the teeth on the other side enter into engagement, the sealing working volume gradually decreases, and the oil in the teeth is squeezed out from the oil discharge cavity 14 of the inner pump body. The oil discharge port 11 that merges into the outer pump body is delivered to the oil circuit system, the input shaft 8 drives the center wheel 10 to rotate continuously, and the helical planetary gear pump completes the process of continuous oil suction and oil pressure.

Claims (4)

1. a helical teeth planetary gear pump, it is characterized in that: comprise the inside and outside pump housing (4,2) being set in together by close fit mode, be helical gear a central gear (10) of arranging in dead axle mode and at least two planet wheels (7) that arrange around central gear, described central gear (10) is driven by input shaft (8), and this input shaft is supported on inner pump (4) by being positioned at central gear setting sleeve I (9) and the central gear setting sleeve II (12) at two ends; Described planet wheel (7) two ends are arranged in inner pump (4) by sliding bearing (6) and sliding bearing overcoat I (5), sliding bearing overcoat II (13) respectively; Between described central gear (10) and planet wheel (7), inner pump (4) inwall, form respectively several separate oil sucting cavities (15) and oil-discharging cavity (14), and each oil sucting cavity (15) communicates with the inlet port (1) on the outer pump housing, each oil-discharging cavity (14) communicates with the oil drain out (11) on the outer pump housing.

2. helical teeth planetary gear pump according to claim 1, is characterized in that: on described sliding bearing (6), have the oilhole (16) that bearing lubrication is used, this oilhole communicates with the oil-discharging cavity (14) of gear pump.

3. helical teeth planetary gear pump according to claim 1, is characterized in that: the O type circle (3) that adds sealing use between the described inside and outside pump housing.

4. helical teeth planetary gear pump according to claim 1, it is characterized in that: central gear and planet wheel are the low pitch angle helical gear of swing angle 4～5 o, and done mending teeth of gear design, the little bottom clearance design that it is 0.13mm～0.15mm that central gear adopts bottom clearance.