JPH0730394U - Gear pump rectifier - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a gear pump that rectifies the oil from the suction port to each gear. A gear pump which meshes two gears (4, 5) and rotates in mutually opposite directions to transfer liquid between the gear fitting inner walls (2a, 3a), wherein a suction port (6) is offset to the gear (5). A protrusion 12 is formed at the casing wall position that is opened and corresponds to the meshing point on the suction side of both gears 4, 5. A part of the gear 5 near the suction port 6 is provided by blocking a part of the tooth tip of the gear 5 near the suction port 6 and installing a casing wall 15 connected to the protrusion 12 and a flow straightening wall 14 forming an oil feed passage 18. The straightening wall 13 is installed so as to block the tooth tips of the, and the oil passage 15 is formed together with the casing wall 14.
The accompanying rotation phenomenon due to the high speed rotation is blocked, the flow of liquid from the suction port 6 to the distant gear 4 is secured, and the risk of cavitation is eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a high speed gear pump used for engine lubrication and the like.

[0002]

[Prior art]

 For example, as a lubricating oil pump for an engine, a circumscribed gear pump as shown in FIG. 3 which is rotated at a high speed by the engine is often used. This is because gears 4 and 5 circumscribing each other are arranged in mesh with each other in the gear fitting portions 2 and 3 in the casing 1, and two gears (not shown) that mesh these gears 4 and 5 outside the casing 1 are shown. ), The lubricant oil sucked from the suction port 6 is passed through the shallow suction side recess 7 and the teeth 4a and 5a of the gears 4 and 5 and the inner walls 2a of the gear fitting portions 2 and 3, It is configured to be taken in between 3a, compressed, and discharged from the discharge port 9 through the shallow discharge-side concave portion 8. By the way, the positions and sizes of the gears 4, 5, the suction port 6, the discharge port 9 and the like in the above gear pump depend on the engine layout or the demand for energy saving and weight reduction. The suction port 6 may be arranged on one gear 5 side in a biased manner.

[0003]

[Problems to be solved by the device]

 When the suction port 6 is arranged on one gear 5 side as described above, the gear pump may rotate at a high speed, and the liquid intake of the gear 4 may be taken from the suction port 6 as shown by the arrow in FIG. The flow “a” toward the intake point A collides with the flow “b” toward the liquid intake point B of the gear 5 which is accompanied by the high speed rotation of the gear 5 and collides with each other to cause a violent turbulence, which is especially a suction. There is a problem in that it becomes difficult to take in the liquid between the teeth 4a of the gear 4 that is farther than the mouth 6, and thus cavitation easily occurs. In view of the above, the present invention aims to provide a gear pump capable of smoothing the intake of oil or the like into each gear by rectifying the flow of oil or the like from the suction port to the gear so as not to disturb the flow. Was devised as.

[0004]

[Means for Solving the Problems]

 To achieve the above object, a gear pump of the present invention is a gear pump that meshes two gears and rotates in mutually opposite directions to transfer liquid between the gear fitting inner wall and a suction port. Is open to one gear, the rectifying wall is installed by blocking a part of the tooth tip of the gear close to the suction port, and the rectifying wall is installed near the meshing point together with the casing wall facing the wall. It is characterized in that an oil passage is formed.

[0005]

[Work]

 In the gear pump of the present invention having the above-mentioned configuration, when both gears rotate at high speed, the liquid that has entered into the casing from the suction port is rectified by the straightening wall, and especially for the gears far from the suction port, the liquid is temporarily passed through the oil passage. It was sent to the vicinity of the meshing point, and it was made to flow into each tooth through the shallow suction side concave portion described later so that the liquid was sufficiently taken up to the tooth root. At this time, if the liquid that reaches the vicinity of the meshing point and flows back through the oil supply passage caused by the high speed rotation of the gear near the suction port is blocked by the flow straightening wall, the flow is disturbed. Absent.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to FIGS. The same reference numerals as those in FIG. 3 represent the same articles, the same members, or the same parts. In the example shown in FIG. 1, the suction side of both gears 4 and 5 is opened by opening an opening 12 near the liquid intake point B in the gear 5 close to the suction port 6 and blocking some tooth tips of the gear 5. The straightening wall 13 is provided close to the tooth tip of the gear 5 up to near the meshing point C of the gear 5, whereby the casing wall 14 facing the straightening wall 14 and the oil feeding passage reaching the vicinity of the meshing point C are provided. 15 is formed.

In the gear pump having the above structure shown in FIG. 1, when the gears 4 and 5 are rotated at high speed, the liquid that has entered the casing 11 through the suction port 6 is rectified by the rectifying wall 13 and Flown from the opening 12 between the teeth 5a of the gear 5, and with respect to the gear 4, passes through the oil feed passage 15 to reach the vicinity of the meshing point C, and further, the shallow suction side concave portion. The liquid substantially starts to be transferred from the respective liquid intake points A and B in a state in which the liquid flows in between the teeth 4a of the gear 4 via 7 and the liquid is sufficiently taken up to the tooth root. The liquid that has passed through the oil supply passage 15 and reaches the vicinity of the meshing point C is blocked by the flow straightening wall 13 from being accompanied by the high speed rotation of the gear 5, and there is no turbulence of the flow generated in the conventional example of FIG. , Is smoothly taken into each gear 4, 5.

In the example shown in FIG. 2, from the liquid intake point B of the gear 5 to the vicinity of the meshing point C, along the tooth tip of the toothed wheel 5 and with a space S between the tooth tip and the straightening wall. 16 is provided, so that the oil supply passage 17 reaching the vicinity of the meshing point C 1 is formed together with the casing wall 14 facing the straightening wall 16.

In the gear pump shown in FIG. 2 having the above structure, when the gears 4 and 5 are rotated at a high speed, the liquid that has entered the casing 11 through the suction port 6 is rectified by the rectifying wall 16 so that the entire amount of the liquid is sent. After passing through the oil passage 17 to the vicinity of the meshing point C, from there, the gear 4 further flows into the space between the teeth 4a of the gear 4 through the shallow suction side recess 7, and with respect to the gear 5. Then, it flows between the teeth 5a of the gear 5 through the gap S and the shallow suction side recess 8. As a result, the transfer is substantially started from the respective liquid intake points A and B in a state where the liquid is sufficiently taken up to the roots of the gears 4 and 5. As in the example of FIG. 1, in the example of FIG. 2 as well, the liquid that reaches the vicinity of the meshing point C through the oil supply passage 17 is blocked by the flow straightening wall 16 from being rotated by the high speed rotation of the gear 5. The turbulence of the flow generated in the conventional example of No. 3 does not occur. It should be noted that if a projection 18 is provided at the casing wall position substantially corresponding to the meshing point C on the suction side of both the gears 4 and 5 as shown by the dotted line in FIGS. 1 and 2, the oil feeding toward the meshing point C is performed. The directivity of the passages 15 and 17 is enhanced, and the transfer of the liquid from the suction port 6 to the distant gear 4 is ensured.

[0010]

The gear pump of the present invention is a gear pump in which two gears are engaged with each other and rotate in opposite directions to transfer a liquid between the gear and the inner wall of the gear fitting portion, and one gear has a single suction port. A part of the gear close to the suction port, a straightening wall is installed by blocking a part of the tooth tip of the gear, and a casing wall facing the wall and a casing wall facing the wall are provided to the oil feed passage near the meshing point. Since the straightening wall is formed, the flow straightening wall can block the accompanying phenomenon that accompanies the high speed rotation of the gear close to the suction port, and can secure the flow of the liquid from the suction port to the gear far from the suction port. The oil supply passage, which is formed by the straightening wall and the casing wall facing the straightening wall, near the meshing point ensures the supply of the liquid, especially to the gear far from the suction port, which may cause cavitation. To lose It has an excellent effect. Further, in the case where the protrusion is provided at the casing wall position substantially corresponding to the meshing point on the suction side of the both gears, the directivity of the oil feed passage toward the meshing point in the oil feed passage by the casing wall and the straightening wall is There is also an effect that the liquid is more reliably transferred from the suction port to the gear farther from the suction port.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a gear pump according to the present invention.

FIG. 2 is a front view of another embodiment of the gear pump of the present invention.

FIG. 3 is a front view of a conventional gear pump 1, 11; casings 2, 3; gear fitting portions 4, 5; gear 6; suction port 7; suction side recess 8; discharge side recess 9; discharge port 11; casing 12 Openings 13 and 16; straightening wall 14; casing walls 15 and 17; oil passage 18; protrusions A and B; liquid intake point C; meshing point S of two gears S; gap.

Claims (4)

[Scope of utility model registration request] 1. A gear pump that meshes two gears and rotates in mutually opposite directions to transfer a liquid between the two gears and an inner wall of a gear fitting portion, wherein a suction port is open to one gear. In this case, a part of the tooth of the gear near the suction port is blocked to install a straightening wall, and an oil feed passage reaching the vicinity of the meshing point is formed together with the casing wall facing the wall. Gear pump. 2. The gear pump according to claim 1, wherein a protrusion is formed at a casing wall position substantially corresponding to a meshing point on the suction side of the both gears. 3. The method according to claim 1, wherein the straightening wall is formed close to the meshing point and close to the tip of the gear close to the suction port while opening the vicinity of the liquid confinement point. 2. The gear pump according to 2. 4. The method according to claim 1, wherein the straightening wall is formed at a distance from the confinement point of the liquid to near the meshing point with a tooth tip of the gear close to the suction port. Gear pump.