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Non-contact oil seal mechanism for rotating shaft
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A non-contact, rotating shaft technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of reduced sealing effect, difficult to expect effect, and unexpectable sealing effect, etc., to achieve the effect of preventing oil flow
Inactive Publication Date: 2006-07-19
KOMATSU LTD
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Problems solved by technology
Naturally, there is also the problem that if the assembly accuracy is not good, the sealing effect will be significantly reduced.
[0011] On the other hand, as the sealing mechanism of the shaft of the rotary machine of the mechanical equipment that cannot be easily repaired after installation, as mentioned above, if the contact seal is used, the long-term sealing effect cannot be expected, but in the above-mentioned It is difficult to expect its effect in a non-contact sealing mechanism
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[0037] figure 1 A cross-sectional view showing a specific example of the non-contact oil seal mechanism for a rotary shaft according to the present invention. figure 2 A partially enlarged cross-sectional view showing the main parts.
[0038] by the figure 1 The illustrated non-contact oil seal mechanism 1 for the rotary shaft (hereinafter simply referred to as the oil seal mechanism 1 ) is an embodiment provided on the low-speed rotary shaft 12 protruding from the bearing portion 15 of the rotary machine 10 . A specific example of .
[0039] The oil seal mechanism 1 is provided inside a housing cover 14 mounted outside a bearing housing 13 that supports an input rotating shaft 12 provided on a case 11 of a rotary machine 10 .
[0040] This oil sealing mechanism 1 is equipped with a plurality of oil recovery chambers 4 formed on the inner peripheral surface of the tank hole 13, a plurality of oil cut grooves 5 corresponding to the positions of each oil recovery chamber 4 a...
Embodiment 1
[0064] Next, in order to verify the function of the non-contact oil seal on the low-rotation shaft, experiments were conducted using the above-mentioned examples. Also, in this example, using Figure 3A The test setup shown was carried out.
experiment example 1
[0066] In this test device 20 , a sealing mechanism is incorporated adjacent to the front bearing housing 24 among the front and rear bearings 23 , 23 ′ supporting the rotating shaft 22 of the through box 21 .
[0067] In addition, the rotary shaft 22 is driven with a desired rotation by a variable speed motor 25 . As a sealing mechanism such as Figure 3B As shown in the enlarged view of the main part P, a fine-sized gap t is provided with the rotating shaft 22, and a decompression chamber 26 (corresponding to the oil storage chamber) is formed on the front side. In addition, a transparent acrylic plate 27 is attached to the front end so that the inside can be seen.
[0068] In this configuration, as a condition for easy oil leakage, the support structure 28 is disposed on the base 29 with the axis tilted forward by 5°.
[0069] Using the test apparatus described above, the test was carried out under the following conditions.
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Abstract
A non-contact oil seal mechanism for a rotating shaft installed in a rotary machine which has the rotating shaft (12) and a casing in which a casing hole (3) rotatably holding the rotating shaft (12) is formed and in which the rotating shaft (12) is held in the casing hole (3) with a clearance t so as to come into non-contact with each other and lubricating oil flows through the clearance (t). The seal mechanism comprises an oil recovery chamber (4) formed in the inner peripheral surface of the casing hole (3) along the circumferential direction of the rotating shaft (12) and recovering the lubricating oil and a plurality of oil cutting grooves (5) formed in the outer peripheral surface of the rotating shaft (12) along the circumferential direction of the rotating shaft (12), arranged along the axial direction of the rotating shaft (12), and opposed to the oil recovery chamber (4). The plurality of oil cutting grooves (5) are formed to be stored within the axial width dimension W1 of the oil recovery chamber (4).
Description
technical field [0001] The present invention relates to a lubricating oil sealing mechanism for a rotating part of a rotary machine, and more particularly, to a non-contact oil sealing mechanism for a rotating shaft that prevents lubricating oil from leaking out of the rotating shaft in a non-contact state. Background technique [0002] Generally, a sealing mechanism is provided at a portion penetrating through a rotary shaft box of a rotary machine or the like to prevent intrusion of dust etc. from the outside of the box and leakage of lubricating oil from the inside of the box to the outside. Contact seals such as O-rings, oil seals, or mechanical seals are often used as the sealing mechanism. [0003] However, in the long-term operation of the contact-type sealing mechanism, the sealing member is in contact with the rotating shaft to wear or deteriorate over time (after several years of use), so that the sealing function cannot be achieved. For this reason, parts must be...
Claims
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Application Information
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