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Gear pump

A gear pump and gear technology, used in pumps, rotary piston pumps, rotary piston machines, etc., can solve the problems of reduced pump discharge, leakage, and increased discharge pulsation amplitude.

Active Publication Date: 2008-08-20
KYB CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a gap is created between the gears 1, 2 and the gear tracks 7, 7
[0012] As described above, once a gap is formed between the gears 1, 2 and the gear tracks 7, 7, internal leakage occurs from the gap, resulting in a decrease in the discharge volume of the pump.
In addition, although the discharge pulsation amplitude can be suppressed by making the backlash zero, the discharge pulsation amplitude is increased due to the leakage from the above-mentioned gap, and there is a problem that the noise is deteriorated.

Method used

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Embodiment approach

[0028] FIG. 1 shows a first embodiment of the present invention. The present invention is characterized by teeth 1a, 2a of gears 1, 2, and other structures are the same as those of the conventional example described above. Therefore, the same reference numerals are assigned to the same configurations as those of the conventional example below.

[0029] As shown in Figure 1, the teeth 1a and 2a of the gears 1 and 2 cut off the corners P1 and P2 formed by the tooth surfaces 3 and 4 and the tooth top surfaces 10 and 11 on the opposite side of the rotation direction R, so that the tooth top thickness t 1 Than the designed addendum thickness t 0 Thin.

[0030] Specifically, the corners P1 and P2 of the above-mentioned teeth 1a and 2a are cut off (0.07 to 0.35)×t in the thickness direction of the tooth tip 0 Thus, the cut surfaces S1 and S2 are formed. That is, the above-mentioned addendum thickness t 1 constitute t 1 = t 0 -(0.07~0.35)×t 0 Relationship.

[0031] In additio...

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Abstract

The present invention relates to a gear pump in which, when the teeth of a pair of gears mesh with each other, the attachment addendums formed at the corners of the teeth do not cut the tooth surfaces of the opposing teeth and are not crushed between the meshing tooth surfaces . In this gear pump, a pair of gears (1), (2) are meshed with zero backlash, and the pair of gears form mutually meshing surfaces (3), (4) along an involute curve, and At the top of the teeth (1a), (2a), ensure the designed addendum thickness (t0), and the teeth (1a), (2a) of the gears (1), (2) are cut off from the rear in the direction of rotation. The corners (P1), (P2) formed by the tooth surfaces (3), (4) and tooth top surfaces (10), (11) make the tooth top thickness (t1) more than the design tooth top thickness ( t0) thin.

Description

technical field [0001] The present invention relates to a zero-backlash gear pump in which backlash is greatly reduced in order to suppress the amplitude of discharge pulsation. Background technique [0002] The noise of hydraulic control devices is generally considered to be mainly caused by the amplitude of the discharge pulsation of the hydraulic pump. In addition, in gear pumps, in order to reduce the amplitude of the discharge pulsation, there is known a pump in which the clearance between gear meshing parts, that is, the so-called backlash, is reduced as close to zero as possible. Such gear pumps are generally called zero backlash gear pumps. [0003] 3 and 4 show a conventional zero-backlash gear pump. As shown in FIG. 3 , in the existing zero-backlash gear pump, a pair of gears 1 and 2 are assembled into the casing holes b1 and b2 of the gearbox G. As shown in Fig. 4, the gears 1, 2 form the flanks 3, 4 of their teeth 1a, 2a along involute curves. In addition, th...

Claims

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Application Information

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IPC IPC(8): F04C2/18
CPCF04C2/084F04C2/00F04C2/18
Inventor 小金井喜一
Owner KYB CORP