JPH0545598Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint lubrication structure for a marine counter-rotating propeller shaft system.

[Conventional technology]

The shaft system structure of a marine contra-rotating propeller is as follows:
Conventionally, for example, a device as shown in the longitudinal sectional view of FIG. 2 is known.

That is, in a marine counter-rotating propeller shaft system device driven by an inner shaft 014 and a hollow outer shaft 015 coaxially extrapolated thereto, the space between the input side of the reversing gear 016 and the rear end of the intermediate short shaft 022 An elastic joint 020 is inserted into the main engine output shaft 021 to branch torque to the reversing gear 016 via a leaf spring 019, and an intermediate short shaft 022 is inserted between the elastic joint 020 and the main engine output shaft 021 and is longer than the axial length of the elastic joint 020. It is equipped with
By removing the intermediate short shaft 022, the elastic joint 02
0 can be easily inspected and released.

In this type of structure, the cylindrical flange 01 to which the elastic joint 020 is fitted is hydraulically fitted to the tapered end of the intermediate inner shaft 017, and a plurality of sets ( Lubricating oil is supplied to the groove 023 (see FIG. 3) on the outer periphery of the flange 01 with the cylindrical portion to which the leaf springs 019 (12 sets in the figure) are attached.

Therefore, as shown in the partially enlarged view of FIG. 3, in order to fit the cylindrical flange 01 to the tapered end of the intermediate inner shaft 017 using hydraulic pressure, a spiral oil groove 024 is formed in the inner circumferential surface of the flange 01. , and oil hole 02
High-pressure oil 026 can be supplied from the outside through 5, and an oil reservoir 028 is recessed in the inner circumferential surface of the cylindrical flange 01 to supply lubricating oil 027 to the leaf spring 019. In addition, an oil supply hole 029 is provided between the oil reservoir 028 and the front end of the flange 01 with the cylindrical portion, and an oil hole 030 is provided between the oil reservoir 028 and the groove 023 on the outer periphery of the flange 01 with the cylindrical portion. ing.

However, in such a joint lubrication structure,
It has the following drawbacks.

(1) Oil reservoir 02 on the inner peripheral surface of flange 01 with cylindrical part
Since 8 is recessed, the flange with cylindrical part 0
The strength of No. 1 is significantly reduced. Furthermore, when the flange 01 with a cylindrical part is press-fitted into the intermediate inner shaft 017, high pressure oil 026 of 500 to 1000 kg/cm ² is applied to the spiral oil groove 024.
1 and enters the oil sump 028, and from there there is a risk of entering the elastic joint 020, which has a low-pressure design with a maximum pressure of about 6 kg/cm ² , and damaging it.

(2) Therefore, a structure is known in which the oil reservoir is abolished and a plurality of axial oil supply holes 031 are provided at the base of the leaf spring 019, such as the structure shown in FIG. 4, but in such a structure, It is difficult to process the oil supply holes 031, and the method for supplying lubricating oil to each oil supply hole 031 becomes complicated, reducing reliability.

(3) In both the structures shown in Fig. 3 and Fig. 4, the inner peripheral surface of the flange 01 with a cylindrical part needs to be actually slid together with the intermediate inner shaft 017, but the flange 01 with a cylindrical part
The work of attaching the leaf spring 019 to the outer peripheral surface of the elastic joint 02 is done by the elastic joint manufacturer.
When assembling the shaft system as 0, each machining process interferes with each other.

(4) It is necessary to harden the base of the leaf spring 019, but the heat may cause deformation of the inner surface of the flange 01 with the cylindrical part, so it is necessary to finish the inner surface of the flange 01 with the cylindrical part after the leaf spring 019 is installed. Therefore, the assembly period for the shaft system will be longer.

[The problem that the idea aims to solve]

The present invention was proposed in view of these circumstances, and eliminates the need for recessing an oil reservoir on the inner peripheral surface.
When high-pressure oil is applied to the helical oil groove, it does not flow into the elastic joint, making it easy to drill the oil supply hole in the groove, and the mechanism for supplying lubricating oil to it is simple, and there is no duplication of processing steps. The purpose is to provide a joint lubrication structure for a marine counter-rotating propeller shaft system that has flanges, etc. and is excellent in terms of strength, safety, workability, reliability, construction time, etc.

[Means to solve the problem]

To this end, the present invention includes a counter-rotating propeller shaft in which a rear propeller and a front propeller are driven by an inner shaft and a hollow outer shaft coaxially extrapolated to the inner shaft and equipped with a reversing gear, and an input of the reversing gear. a counter-rotating propeller shaft for marine vessels, the shaft having an elastic joint attached to the side and externally fitted on the front end of the inner shaft via a flange with a cylindrical portion, and branching torque to the reversing gear via an elastic body attached to the outer periphery; In the system structure, a hollow joint shaft is fitted and fixed to the cylindrical part of the flange with a cylindrical part and the elastic joint is attached to the outer periphery, and a hollow joint shaft is recessed in the inner peripheral surface of the hollow joint shaft and cooperates with the flange with the cylindrical part. The present invention is characterized by comprising: an annular oil reservoir formed by the flange with the cylindrical portion; an oil supply hole communicating with the oil reservoir from the front end of the flange with the cylindrical portion; and an oil hole communicating from the oil reservoir with the elastic body.

[Effect]

Since only one oil supply hole is required for the elastic joint, the drilling work is facilitated. Furthermore, since no oil reservoir is recessed in the inner peripheral surface of the assembly flange, the strength of the assembly flange is increased and there is no risk of high pressure oil flowing into the elastic joint. Furthermore, after the inner circumferential surfaces of the assembled flanges have been slid together, the completed elastic joint can be attached to the outer circumferential surface of the assembled flanges via bolts.

〔Example〕

An embodiment of the present invention will be explained with reference to the drawings.
The same reference numbers as in Figures 2 to 4 indicate the same members as in the same figure, and in the longitudinal cross-sectional view of Figure 1, 1 is an assembly flange with a central flange 2 protruding from the center of the outer peripheral surface in the front and back direction. , 3 is a hollow joint shaft having a plurality of leaf springs 019 attached to its outer periphery, and is fixed to the central flange 2 via bolts 4.

4a is an annular oil reservoir recessed in the inner circumferential surface of the hollow joint shaft 3 and formed in cooperation with the outer circumferential surface of the assembly flange 1; 5 is an annular oil reservoir formed along the axis of the assembly flange 1; 6 is a plurality of oil holes led from the oil sump 4 to the base of each leaf spring 019 at equal intervals; 7, 8; are oil drain holes drilled in the hollow joint shaft 3 and the reversing gear input shaft 9, respectively;
10 and 11 are bearings for the intermediate inner shaft 017 and the reversing gear input shaft 9, respectively, and 12 is a labyrinth.

In such a structure, high pressure oil 026 for fitting the assembly flange 1 onto the intermediate inner shaft 017 is injected through the oil hole 025 and the spiral oil groove 024. Also, the lubricating oil 027 is first supplied to the oil reservoir 4a through the oil supply hole 5, and from there to the oil hole 6, respectively.
The oil is supplied to the base of each leaf spring 019 through the oil drain holes 7 and 8 and collected into a tank (not shown).

According to such a structure, the following effects can be achieved.

(1) Since only one oil supply hole is required for the elastic joint, the drilling work is extremely easy and economical.

(2) Since the oil reservoir is not recessed on the inner peripheral surface,
The strength of the assembled flange is improved, and there is no risk that high-pressure oil in the spiral oil groove will flow into the elastic joint, improving its reliability.

(3) After sliding the inner peripheral surfaces of the assembly flanges together,
Since the finished elastic joint can be attached to the outer circumferential surface of the assembly flange in one piece via bolts, there is no duplication of processing steps and the construction period can be shortened.

[Effect of idea]

In short, according to the present invention, there is provided a counter-rotating propeller shaft in which a rear propeller and a front propeller are driven by an inner shaft and a hollow outer shaft that is coaxially extrapolated to the inner shaft and has a reversing gear attached thereto, and a counter-rotating propeller shaft that drives a rear propeller and a front propeller, respectively, and and an elastic joint attached to the input side of the inner shaft and externally fitted on the front end of the inner shaft via a flange with a cylindrical part and branching torque to the reversing gear via an elastic body attached to the outer periphery. In the propeller shaft system structure, the hollow joint shaft is fitted onto the cylindrical part of the flange with a cylindrical part and has the elastic joint attached to the outer periphery, and the flange with the cylindrical part is recessed in the inner peripheral surface of the hollow joint shaft. The inner peripheral surface There is no need to install an oil reservoir in the groove, and when high-pressure oil is applied to the spiral oil groove, it does not flow into the elastic joint, making it easy to drill an oil supply hole in the groove and providing a lubricant supply mechanism to it. This invention provides a joint lubrication structure for a marine counter-rotating propeller shaft system that is easy to assemble, has an assembly flange, etc. that does not overlap machining processes, and is excellent in terms of strength, safety, workability, reliability, construction time, etc. is extremely useful for industry.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. Fig. 2 is a vertical cross-sectional view showing the shaft system structure of a known contra-rotating marine propeller, Fig. 3 is a partially enlarged view of the part shown in Fig. 2, and Fig. 4 shows a known joint lubrication structure different from Fig. 3. It is also a partially enlarged view shown in FIG. 1... Assembly flange, 2... Central flange, 3
... Hollow joint shaft, 4 ... Bolt, 4a ... Oil reservoir, 5 ... Oil supply hole, 6 ... Oil hole, 7, 8 ... Oil drain hole, 9 ... Reversing gear input shaft, 10, 11 ... ... Bearing, 12 ... Labyrinth, 01 ... Flange with cylindrical part, 017 ... Intermediate inner shaft, 019 ... Leaf spring,
024...Spiral oil groove, 025...Oil hole, 02
6...High pressure oil, 027...Lubricating oil.

Claims (1)

[Scope of utility model registration request] A counter-rotating propeller shaft that drives a rear propeller and a front propeller, respectively, by an inner shaft and a hollow outer shaft that is coaxially inserted into the inner shaft and has a reversing gear attached thereto, and a cylindrical shaft attached to the input side of the reversing gear. In the marine counter-rotating propeller shaft system structure, the structure includes an elastic joint that is externally fitted onto the front end of the inner shaft via a attached flange and branches torque to the reversing gear via an elastic body attached to the outer periphery. a hollow joint shaft that is externally fitted and fixed to the cylindrical part of the flange with a cylindrical part and has the elastic joint attached to the outer periphery; A counter-rotating propeller shaft system for marine vessels, comprising: an annular oil reservoir; an oil supply hole communicating from the front end of the flange with the cylindrical portion to the oil reservoir; and an oil hole communicating from the oil reservoir to the elastic body. Joint lubrication structure.