阅读说明：本技术 一种能防止外转子卡滞的变速器油泵 (Transmission oil pump capable of preventing outer rotor from being stuck ) 是由 唐业和 许仲秋 刘光明 佘笑梅 于 2021-08-13 设计创作，主要内容包括：本发明提供了一种能防止外转子卡滞的变速器油泵,包括泵体、外转子、内转子、盖板,所述泵体设有用于容纳外转子和内转子的圆形转子腔,所述转子腔的底面设有凸起的月牙隔板,以及下凹的吸油腔和出油腔,吸油腔和出油腔分列于月牙隔板的左右两边,所述转子腔侧壁上对应出油腔的位置设有一个轴向凹槽,该轴向凹槽的位置接近月牙隔板；所述轴向凹槽的下端与出油腔连通,出油腔内的高压油能够进入到轴向凹槽内且作用于外转子的外周面,给外转子施加一个向内的压力。上述技术方案能够使外转子受力情况及工作环境得到相应的改善,从而避免卡滞和烧蚀。(The invention provides a transmission oil pump capable of preventing jamming of an outer rotor, which comprises a pump body, the outer rotor, the inner rotor and a cover plate, wherein the pump body is provided with a circular rotor cavity for accommodating the outer rotor and the inner rotor, the bottom surface of the rotor cavity is provided with a raised crescent partition plate, a recessed oil suction cavity and a recessed oil outlet cavity, the oil suction cavity and the oil outlet cavity are respectively arranged at the left side and the right side of the crescent partition plate, the side wall of the rotor cavity corresponding to the oil outlet cavity is provided with an axial groove, and the axial groove is close to the crescent partition plate; the lower end of the axial groove is communicated with the oil outlet cavity, and high-pressure oil in the oil outlet cavity can enter the axial groove and act on the peripheral surface of the outer rotor to apply inward pressure to the outer rotor. The technical scheme can correspondingly improve the stress condition and the working environment of the outer rotor, thereby avoiding clamping stagnation and ablation.)

1. The utility model provides a can prevent derailleur oil pump of external rotor jamming, includes the pump body (3), external rotor (7), inner rotor (9), apron (10), the pump body (3) are equipped with the circular rotor chamber that is used for holding external rotor (7) and inner rotor (9), the bottom surface in rotor chamber is equipped with bellied crescent baffle (34) to and recessed oil absorption chamber (31) and oil outlet chamber (32), oil absorption chamber (31) and oil outlet chamber (32) branch list in both sides about crescent baffle (34), its characterized in that: an axial groove (33) is formed in the side wall of the rotor cavity corresponding to the oil outlet cavity (32), and the position of the axial groove (33) is close to the crescent partition plate (34); the lower end of the axial groove (33) is communicated with the oil outlet cavity (32), and high-pressure oil in the oil outlet cavity (32) can enter the axial groove (33) and act on the outer peripheral surface of the outer rotor (7) to apply inward pressure to the outer rotor (7).

2. The transmission oil pump capable of preventing the outer rotor from being stuck as recited in claim 1, wherein: the groove bottom of the axial groove (33) is arc-shaped.

Technical Field

The invention relates to the technical field of transmission lubricating hydraulic systems, in particular to a large-displacement transmission oil pump of a commercial vehicle.

Background

The heavy hydraulic automatic transmission of the commercial vehicle has higher requirements on lubrication and heat dissipation compared with a passenger vehicle due to large load, so that the discharge capacity of a transmission oil pump is larger than that of the passenger vehicle oil pump, the structure of the transmission is compact, the low resistance of a pre-pump filtering system of the transmission oil pump is ensured under the limited volume, the suction capacity of the oil pump is ensured not to be obviously reduced by reducing the filtering precision grade, and the transmission oil pump has more impurities and larger particles when working. In order to improve the anti-pollution capability of a transmission oil pump of a commercial vehicle, the conventional method is to properly increase the clearance of internal relative movement parts, but the transmission oil pump also needs to provide hydraulic pressure for a hydraulic system, so the clearance of the internal relative movement parts cannot be too large, otherwise, the oil pump has low volumetric efficiency under high pressure, and the working pressure of the hydraulic system cannot be met. Therefore, the heavy hydraulic automatic transmission of the commercial vehicle has a severe working environment, and the phenomenon of rotor jamming is higher than that of a passenger vehicle transmission oil pump.

Disclosure of Invention

The invention aims to provide a transmission oil pump capable of preventing an outer rotor from being stuck.

In order to solve the technical problems, the invention adopts the following technical scheme: a transmission oil pump capable of preventing outer rotor from being blocked comprises a pump body, an outer rotor, an inner rotor and a cover plate, wherein the pump body is provided with a circular rotor cavity for accommodating the outer rotor and the inner rotor, the bottom surface of the rotor cavity is provided with a raised crescent partition plate, a recessed oil suction cavity and a recessed oil outlet cavity, the oil suction cavity and the oil outlet cavity are respectively arranged at the left side and the right side of the crescent partition plate, an axial groove is arranged on the side wall of the rotor cavity corresponding to the oil outlet cavity, and the axial groove is close to the crescent partition plate; the lower end of the axial groove is communicated with the oil outlet cavity, and high-pressure oil in the oil outlet cavity can enter the axial groove and act on the peripheral surface of the outer rotor to apply inward pressure to the outer rotor.

As a preferred technical scheme, the groove bottom of the axial groove is arc-shaped.

The beneficial effects obtained by the invention are as follows:

1) because the high-pressure oil in the oil outlet cavity can enter the axial groove and act on the peripheral surface of the outer rotor, and an inward pressure is applied to the outer rotor, partial pressure of the internal oil pressure acting on the outer rotor can be counteracted, the force of the peripheral surface of the outer rotor acting on the side wall of the rotor cavity is reduced, and the oil film between the outer rotor and the outer rotor is not easy to break, so that ablation is avoided.

2) Because the axial groove is communicated with the oil outlet cavity, so that local high pressure is formed at the position, impurities coming from the gap between the outer rotor and the side wall of the rotor cavity along with oil can encounter resistance at the position, and can not enter a small gap along with the rotation of the outer rotor, and most of the impurities can directly enter the oil outlet cavity along with the axial groove, so that the risk that the outer rotor is blocked by the impurities is reduced.

Drawings

FIG. 1 is a schematic diagram of an exploded structure of an oil pump in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a pump body according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line AA of FIG. 3;

FIG. 4 is a schematic structural view of the pump body of FIG. 2 with an outer rotor mounted thereon;

the reference signs are:

1-oil seal 2-pump body bush 3-pump body

4-steel ball 5-spring 6-screw plug

7-external rotor 8-internal rotor bushing 9-internal rotor

10-cover plate 11-screw 31-oil suction cavity

32-oil outlet cavity 33-axial groove 34-crescent partition plate.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1 to 4, a transmission oil pump capable of preventing an outer rotor from being stuck comprises an oil seal 1, a pump body bushing 2, a pump body 3, a steel ball 4, a spring 5, a plug screw 6, an outer rotor 7, an inner rotor bushing 8, an inner rotor 9, a cover plate 10 and a screw 11, wherein the pump body 2 is provided with a circular rotor cavity for accommodating the outer rotor 7 and the inner rotor 9, the bottom surface of the rotor cavity is provided with a raised crescent partition plate 34, a recessed oil suction cavity 31 and an oil outlet cavity 32, the oil suction cavity 31 and the oil outlet cavity 32 are respectively arranged on the left side and the right side of the crescent partition plate 34, an axial groove 33 is arranged on the side wall of the rotor cavity corresponding to the oil outlet cavity 32, and the axial groove 33 is close to the crescent partition plate 34; the groove bottom of the axial groove 33 is arc-shaped, the lower end of the groove bottom is communicated with the oil outlet cavity 32, and high-pressure oil in the oil outlet cavity 32 can enter the axial groove 33 and act on the peripheral surface of the outer rotor 7 to apply inward pressure to the outer rotor 7.

As shown in fig. 4, the high-pressure oil in the oil chamber 32 acts on the inner side surface of the outer rotor 7 to generate a force F, and the axial groove 33 on the side wall of the rotor chamber introduces the high-pressure oil in the oil chamber 32, so that a force F1 is also generated on the outer side of the outer rotor 7, and the component force F1' = F1 × sin α of the force is opposite to the direction F, which can counteract the partial pressure of the high-pressure oil acting on the inner side of the outer rotor, so that the force of the outer peripheral surface of the outer rotor 7 acting on the side wall of the rotor chamber is reduced, and the oil film between the outer peripheral surface of the outer rotor and the wall of the rotor chamber is ensured to be difficult to break, thereby avoiding ablation.

When the external rotor oil pump works, high-pressure oil in the oil outlet cavity 32 acts on the inner side surface of the external rotor 7 to generate a force F, so that the outer peripheral surface of the external rotor 7 is always attached to the side wall of the rotor cavity and deviates to the side of the oil outlet cavity 32, the gap between the external rotor 7 and the side wall of the rotor cavity is gradually reduced from the oil suction cavity 31 to the oil outlet cavity 32, if impurities mixed in the gap cannot be timely discharged, the side wall of the rotor cavity on the side of the oil outlet cavity 32 is easily abraded in advance, and serious people can also cause the external rotor to be blocked. Because this embodiment has set up the axial recess on the rotor chamber lateral wall, and the axial recess communicates with each other with the oil outlet chamber, equals to form local high pressure here, can meet with the resistance here along with the impurity that fluid came from the outer rotor with rotor chamber lateral wall clearance, can't all enter the place of small clearance along with the outer rotor rotation, and most impurity can directly get into the oil outlet chamber along with this axial recess to reduce the risk that the outer rotor is blocked by the impurity.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.