JPH04113796U - gear pump - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the rattling of the center bushing, to prevent an increase in internal leakage caused by the rattling of the center bushing, and to effectively reduce pulsation. The purpose is to provide gear pumps. [Structure] In the case of the present invention, since the bush 101 is integrally provided with the housing 1, it will not rattle even if a fluctuating load due to the phase difference between the front gear group and the rear gear group acts. Noise generation and internal leakage caused by rattling can be reduced. Furthermore, as a result, it greatly contributes to reducing pulsation.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a gear pump, and particularly to a gear pump located between a front gear group and a rear gear group. In a device designed to eliminate pulsation by setting a constant phase difference, the By integrating the bush inserted in the housing into the housing, Relating to something designed to prevent rattling.

0002

[Conventional technology]

Conventionally, gear pumps have had a configuration as shown in FIG. First, the housing 1, this housing 1 includes a mounting flange 3, a body 5, and a cover. 7, with a mounting flange 3 and a cover on both sides of the body 5. -7 are arranged and fixed with a plurality of fixing bolts 9.

0003 A drive shaft 11 connected to a drive section (not shown) is inserted through the housing 1. A front drive gear 13 and a rear drive gear are mounted on this drive shaft 11. Gear 15 is fixed. The front drive gear 13 includes a A driven gear 17 is in mesh with the driven gear 17, and this driven gear 17 is fixed to the shaft 19. Ru. Further, a rear driven gear 21 is meshed with the rear drive gear 15. , this driven gear 21 is fixed to a shaft 23. Above front drive gear 13 and the front driven gear 17 constitute a front gear group 14. Ru. Furthermore, the rear drive gear 15 and the rear driven gear 21 It constitutes group 16.

0004 Inside the housing 1, there is a center bush 25 as a bush; A winding bush 27 is arranged on the circumferential side, and the drive shaft 11 and shaft 19 and 23 are rotatably supported by both these bushes 25 and 27. or, An oil seal 29 is inserted between the drive shaft 11 and the mounting flange 3. This oil seal 29 is fixed by a snap ring 31. There is. Mounting flange 3, front drive gear 13 and front door A side plate 33 is arranged between the bun gear 17 and the side plate 33 . Also, cover 7 There is also a side plate between the rear drive gear 15 and the rear driven gear 21. 35 are arranged. In addition, the symbols 37, 39, and 41 in the figure are O-rings.

[0005] According to the above configuration, when the drive shaft 11 is rotated by the drive section (not shown), the As a result, the front drive gear 13 and rear drive gear 15 rotate. stop The front driven gear 17 and rear driven gear 21 meshing with them are Rotate. As a result, the fluid is suctioned, pressurized, and discharged.

[0006] By the way, in a gear pump with such a configuration, it is impossible to eliminate pulsation. It has great meaning. Therefore, as shown in FIG. 5, the front gears 13 and 17 and gears 15 and 21 on the rear side (between the front side and the rear side). The phase is shifted by one tooth), thereby eliminating pulsation by interfering with each other. Efforts have been made to

[0007]

[Problem that the idea aims to solve]

The conventional configuration described above has the following problems. As already mentioned, freon A predetermined phase difference is set between the rear gear group 14 and the rear gear group 16. the Therefore, the loading force acting on the center bush 25 is divided between the front side and the rear side. This causes a large fluctuating load to act on the center bushing 25. It ends up being a problem. As a result, the center bush 25 becomes loose, There was a problem that noise was generated and internal leakage increased. . Also, due to these factors, the pulsation, which should theoretically decrease, does not decrease that much. There was also a problem.

[0008] The present invention was developed based on these points, and its purpose is to Eliminate the looseness of the center bushing and eliminate the looseness caused by the looseness of the center bushing. It is possible to prevent noise and internal leakage from increasing, and to effectively reduce pulsation. Our goal is to provide gear pumps that

[0009]

[Means to solve the problem]

In order to achieve the above object, the gear pump according to the present invention includes a housing and the above-mentioned hub. The drive shaft is arranged through the housing, and the drive shaft is arranged inside the housing. The front drive gear fixed to the front drive gear and the flap meshed with this front drive gear A front gear group consisting of a front driven gear and a A rear drive gear fixed to the above drive shaft and a gear meshed with this rear drive gear. The rear driven gear has a predetermined phase difference with respect to the front gear group. The front gear group and the front gear group are integrally formed on the inner circumferential side of the housing. A bush interposed between the bush and the bush. It is.

0010

[Effect]

A predetermined phase difference is set between the front gear group and the rear gear group, and This has been devised to eliminate pulsation. At that time, against the bush The timing of the loading force is also different between the front gear group and the rear gear group. As a result, a large fluctuating load acts on the bushing. In contrast, in the present invention In this case, since the bushing is provided integrally with the housing, the above fluctuating load can be avoided. There is no rattling even when the work is done, and there is no noise caused by rattling, and the internal The occurrence of leakage can be reduced. Also, as a result, it greatly contributes to reducing pulsation. give

[0011]

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. In addition, the same as before Parts are designated by the same reference numerals and their explanations will be omitted. As shown in Figure 1, the actual The center bush 101 of the embodiment is integrally formed on the inner peripheral side of the body 5. Since the center bush 101 is integrated into the body 5 in this way, the front gear Even if a variable load based on the phase difference between the rear gear group 14 and the rear gear group 16 is applied, it will not shake. Never. Therefore, noise caused by rattling and internal leakage are reduced. can be set.

0012 It also greatly contributes to reducing pulsation. That is, center bush 10 Since the rattling of 1 is gone, the center bush 101 is separated from the side of each gear. No more warping or tilting, front gear group side 14 and rear gear group 1 The discharge characteristics of each of the 6 sides are rectified as shown in FIG. Therefore, The final discharge characteristics obtained by combining them are as shown in the figure, and the pulse The motion is effectively reduced.

[0013]According to the conventional configuration, a state as shown in FIG. 3 occurs. In other words, the discharge characteristics of the front gear group 14 side and the rear gear group 16 side are not very rectified, and the final discharge characteristics that constitute them also have disordered waveforms. As a result, the pulsation, which could theoretically be reduced, is not reduced very effectively. As compared with the case of FIG. 2, it can be seen that the amplitude Δε in the case of this example is greatly reduced compared to the conventional Δε ₁ .

[0014]

[Effect of the idea]

As detailed above, according to the gear pump according to the present invention, the bush is attached to the housing. Based on the phase difference between the front gear group and the rear gear group, Even when a fluctuating load is applied, the bushing does not rattle, and the noise caused by rattling is eliminated. It is possible to reduce noise generation and internal leakage. Also, as a result, the pulsation It also greatly contributes to reduction.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a gear pump showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention and is a diagram showing ejection characteristics.

FIG. 3 is a diagram showing conventional ejection characteristics.

FIG. 4 is a sectional view of a conventional gear pump.

FIG. 5 is a diagram showing a conventional example and shows a phase difference between a front gear and a rear gear.

[Explanation of symbols]

1 Housing 11 Drive shaft 13 Front drive gear 14 Front gear group 15 Rear drive gear 16 Riyagiya Group 17 Front driven gear 21 Rear driven gear 25 Center bush (bush)

Claims (1)

[Scope of utility model registration request] 1. A front comprising a housing, a drive shaft disposed through the housing, a front drive gear disposed within the housing and fixed to the drive shaft, and a front driven gear meshed with the front drive gear. a rear gear group having a predetermined phase difference with respect to the front gear group, which includes a gear group, a rear drive gear disposed within the housing and fixed to the drive shaft, and a rear driven gear meshing with the rear drive gear; A gear pump comprising: a bush integrally formed on the inner peripheral side of the housing and inserted between the front gear group and the rear gear group.