Hydraulic pump, hydraulic pump unit, and hydraulic driving unit

Inactive Publication Date: 2007-10-18
KYB CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023] Because the lid-side housing is held in oil-tight contact with the body-side housing with a predetermined pressure that corresponds to the maximum allowable pump hydraulic pressure, the lid-side housing serves the role of a relief valve, and breakage of the hydraulic pump by high pressure inside the pump can thereby be avoided without the presence of a relief valve as a separate element.

Problems solved by technology

This construction, though, requires the relief valve and its related lines to be provided as separate elements, which is problematic in units such as this one in which simplicity and reductions in size and costs are very much desired.

Method used

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  • Hydraulic pump, hydraulic pump unit, and hydraulic driving unit
  • Hydraulic pump, hydraulic pump unit, and hydraulic driving unit
  • Hydraulic pump, hydraulic pump unit, and hydraulic driving unit

Examples

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Embodiment Construction

[0040] FIGS. 1(a)-1(c) show an example of a hydraulic driving unit that includes a hydraulic pump that embodies the present invention. FIG. 1(a) is a hydraulic circuit diagram of the driving unit. FIG. 1(b) is a section view through a part of the hydraulic pump shown in FIG. 1(a). FIG. 1(c) is a front view of the pump shown in FIGS. 1(a) and 1(b).

[0041] FIGS. 2(a) and 2(b) illustrate the operation of the hydraulic pump shown in FIG. 1(b). FIG. 2(c) is an enlarged view of a part of the pump shown in FIG. 2(a), and FIG. 2(d) is an enlarged view of a part of another exemplary embodiment.

[0042] Hydraulic driving unit 10 is used, for example, to lift a working element in a special agricultural vehicle over cultivated ground. A hydraulic pump unit 9 uses hydraulic pressure to drive a hydraulic actuator, which is illustrated in this embodiment as a hydraulic cylinder 2. Other types of hydraulic actuators may also be used with hydraulic pump units of this general type.

[0043] A hydraulic ...

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Abstract

A hydraulic pump can prevent breakage at a high pressure without providing a separate relief valve. A housing has a body side and a lid side that are divided by a surface perpendicular to a rotational axis of a hydraulic pump shaft. The lid-side housing is brought into oil-tight contact with the body-side housing by a spring. Contact between the body-side housing and the lid-side housing is maintained at a predetermined pressure corresponding to a maximum allowable pump hydraulic pressure.

Description

BACKGROUND OF THE INVENTION [0001] The invention relates generally to hydraulic pumping equipment in which a hydraulic fluid is pumped in a hydraulic circuit and used as a source of motive force to drive a hydraulic actuator. The invention relates more specifically to a hydraulic pump used in a hydraulic pump unit in which at least a hydraulic pump and a hydraulic oil tank are integrated. A housing for the hydraulic pump is contained inside the hydraulic oil tank. Embodiments of the invention may also include a hydraulic pump unit provided with a hydraulic pump according to the invention, and a hydraulic driving unit provided with such a hydraulic pump and configured to apply a driving force by hydraulic pressure to a driven body. [0002] Hydraulic pump units in which the hydraulic pump and the hydraulic oil tank are integrated include those in which the hydraulic pump housing is contained in the hydraulic oil tank. [0003] Hydraulic driving units may also include an electric motor fo...

Claims

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Application Information

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IPC IPC(8): F04B49/00
CPCF04C14/265F04C14/18F04B49/00F04B49/04
InventorSATO, OSAMUSAKAI, YOSHITAKE
OwnerKYB CORP