Mounting and sealing structure of outboard engine gear shifting shaft
By installing static, dynamic, and external seals and limiting components between the outboard motor's shift shaft and the gearbox housing, the problem of insufficient sealing was solved, resulting in higher sealing performance and stability, and extending the service life of the gearbox.
Patent Information
- Application Number
- CN202520600634.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-04-01
AI Technical Summary
In the existing technology, the sealing between the shift shaft of the outboard motor and the gearbox housing is insufficient, which leads to a shortened service life of the gearbox. In particular, in muddy or seawater environments, the sealing structure is easily damaged by small solid particles.
The system employs a combination structure of static seals, dynamic seals, and external seals. The static seal is located between the shift shaft cover and the gearbox housing, while the dynamic seal and external seal are located on different sides of the shift shaft and the shift shaft cover, respectively, to enhance the sealing effect. Stable installation is ensured by limiting components.
It effectively isolates the internal structure of the gearbox from the external environment, preventing corrosion from small particulate solids such as mud, sand, and salt spray, extending the service life of the gearbox, improving sealing and stability, and preventing structural damage caused by leakage.
Smart Images
Figure CN223881713U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to outboard motor technical field, concretely relates to a kind of installation and sealing structure of outboard motor shift shaft. BACKGROUND
[0002] Outboard motor, as its name implies, is the propulsion engine installed on the outside of the hull (ship side), usually suspended on the outside of stern plate, also known as outboard motor. According to the energy source, outboard motor is divided into two kinds of fuel outboard motor and electric outboard motor. The working principle of fuel outboard motor is to convert the chemical energy of fuel into mechanical energy through internal combustion engine, and then convert it into the kinetic energy of the boat by mechanical transmission and propeller. Fuel outboard motor is usually composed of three main parts: power head, gear box and propeller, which are connected from top to bottom.
[0003] The shift shaft cover plate of outboard motor, as an important part of the gear box, is used to connect the shift shaft and the gear box shell, so that the shift shaft can be extended from the gear box shell for gear shifting operation. Since boats are often used in natural water environment, the use environment of outboard motor has great uncertainty. The natural water environment contains a large amount of microorganisms, impurities and silt, etc. The sealing requirement between the shift shaft cover plate and the shift shaft of the underwater gear box shell is quite strict, and whether the sealing between the two can be done well is the key to the service life of the gear box.
[0004] When the outboard motor is working, the shift shaft is moved up and down to realize the gear shifting operation of the gear box, so the sealing structure between the shift shaft and the shift shaft cover plate needs to be considered. Especially in the water area or seawater environment with silt, the contact position between the shift shaft and the shift shaft cover plate is easy to accumulate silt or salt mist during the up and down movement of the shift shaft. If small particles of solid are stuck in the sealing structure between the shift shaft and the shift shaft cover plate, the sealing structure will be damaged, the sealing between the shift shaft and the gear box shell will be reduced, and the service life of the entire gear box will be affected.
[0005] Therefore, there is an urgent need for an installation and sealing structure of outboard motor shift shaft to realize the connection between the shift shaft and the gear box shell and improve the sealing therebetween, thereby prolonging the service life of the gear box. UTILITY MODEL CONTENTS
[0006] The utility model intends to provide an installation and sealing structure of outboard motor shift shaft to solve the technical problem of low sealing between the shift shaft and the gear box shell in the prior art, which affects the service life of the gear box.
[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0008] The application discloses an installation and sealing structure of a shift shaft of an outboard engine, which comprises a shift shaft cover plate installed on a gear box shell, wherein an installation hole communicating with the inside of the gear box shell is formed in the shift shaft cover plate, and a shift shaft is inserted into the installation hole; a static sealing piece is arranged between the shift shaft cover plate and the gear box shell, a dynamic sealing piece and an outer sealing piece are arranged between the shift shaft and the shift shaft cover plate, the dynamic sealing piece is installed on the side of the shift shaft cover plate close to the inside of the gear box shell, and the outer sealing piece is installed on the side of the shift shaft cover plate close to the outside of the gear box shell.
[0009] The principle and advantages of the application are as follows:
[0010] In actual application, the sealing between the shift shaft cover plate and the gear box shell is realized through the static sealing piece, and the sealing between the shift shaft and the shift shaft cover plate is realized through the dynamic sealing piece and the outer sealing piece, so that the internal structure of the gear box shell can be effectively isolated from the external environment, the internal structure of the gear box is protected, and the service life of the whole gear box is prolonged.
[0011] For the sealing structure between the shift shaft and the shift shaft cover plate, the outer sealing piece is additionally arranged on the basis of the dynamic sealing piece, in the water area with mud or in the seawater environment, during the process that the shift shaft is repeatedly stirred downwards, the outer sealing piece installed on the side of the shift shaft cover plate close to the outside of the gear box shell can block the small granular solids such as mud and salt mist outside the gear box shell, so that the small granular solids such as mud and salt mist cannot erode into the inside of the gear box shell, and the dynamic sealing piece located on the side of the shift shaft cover plate close to the inside of the gear box shell is prevented from being damaged, the double sealing is beneficial to improving the sealing performance between the shift shaft and the shift shaft cover plate, the damage of the internal structure of the gear box caused by the leakage at the joint between the shift shaft and the shift shaft cover plate can be basically avoided, and the service life of the whole gear box is prolonged.
[0012] Preferably, as an improvement, a limiting piece is arranged between the shift shaft cover plate and the gear box shell, and the limiting piece is used for limiting the shift shaft cover plate on the gear box shell.
[0013] Beneficial effects: the shift shaft cover plate is limited on the gear box shell through the limiting piece, so that the relative position stability between the shift shaft cover plate and the gear box shell is improved, the stable installation of the shift shaft on the gear box shell is ensured, and the effective sealing between the shift shaft cover plate and the gear box shell and between the shift shaft and the shift shaft cover plate is ensured.
[0014] Preferably, as an improvement, the limiting piece comprises a limiting pressing plate and a limiting screw, the limiting pressing plate abuts against the top of the shift shaft cover plate and the gear box shell, a limiting hole is formed in the limiting pressing plate corresponding to the position of the gear box shell, a limiting screw hole is formed in the gear box shell corresponding to the position of the limiting hole, and the limiting screw is threadedly connected into the limiting screw hole through the limiting hole.
[0015] Beneficial effects: the scheme fixes and connects the limiting pressing plate on the gear box shell through the limiting screw, and the limiting pressing plate abuts against the top of the gear box shell and the shift shaft cover plate, so that the limiting of the shift shaft cover plate and the gear box shell can be realized, the whole limiting piece has simple structure, convenient installation and reliable work.
[0016] Preferably, as an improvement, the top of the shift shaft cover plate is fixedly connected with a limiting block, the opposite sides of the limiting block are provided with limiting surfaces, and the end of the limiting pressing plate corresponding to the shift shaft cover plate abuts against the limiting surface.
[0017] Beneficial effects: the limiting surface of the limiting block abuts against the end of the limiting pressing plate, so that the limiting of the limiting pressing plate can be realized, the limiting pressing plate is prevented from rotating with the limiting screw due to friction during the process of tightening the limiting screw to fix the limiting pressing plate on the gear box shell, so that the limiting pressing plate abuts against the top of the gear box shell and the shift shaft cover plate at the same time, and the limiting effect of the limiting pressing plate on the shift shaft cover plate is ensured.
[0018] In addition, during long-time use, the shift shaft cover plate is stationary relative to the gear box shell, and when the shift shaft cover plate needs to be disassembled for maintenance, a wrench can be used to cooperate with the two limiting surfaces of the limiting block to clamp the limiting block, the shift shaft cover plate is rotated relative to the gear box shell by rotating the limiting block, the shift shaft cover plate is loosened, and maintenance is facilitated.
[0019] Preferably, as an improvement, the static seal piece is a static O-ring, the side wall of the shift shaft cover plate is provided with a sealing groove in the circumferential direction, the static O-ring is sleeved in the sealing groove, and the static O-ring is in interference fit with the sealing groove and the gear box shell.
[0020] Beneficial effects: the scheme uses a static O-ring as a static seal piece, which is reliable in function and can effectively realize the axial static sealing between the shift shaft cover plate and the gear box shell, and the installation requirement is simple, which can simplify the sealing structure between the shift shaft cover plate and the gear box shell.
[0021] Preferably, as an improvement, the dynamic seal piece is a dynamic O-ring, the bottom of the shift shaft cover plate is provided with a lower counterbore at the position corresponding to the mounting hole, the dynamic O-ring is sleeved on the shift shaft in the lower counterbore, and the dynamic O-ring is in interference fit with the lower counterbore and the shift shaft.
[0022] Beneficial effects: the scheme uses a dynamic O-ring as a dynamic seal piece, which is reliable in function and can effectively realize the dynamic sealing between the shift shaft and the shift shaft cover plate, and the installation requirement is simple, which can simplify the sealing structure between the shift shaft and the shift shaft cover plate.
[0023] Preferably, as an improvement, a sealing plate is detachably fixed to the bottom of the shift shaft cover plate, the sealing plate covers the lower countersunk hole, and a clearance hole is opened on the sealing plate corresponding to the position of the shift shaft, and the shift shaft is inserted into the clearance hole.
[0024] Beneficial effects: This solution limits the downward displacement of the moving O-ring by a sealing pressure plate, effectively confining the moving O-ring in the lower countersunk hole. This prevents the moving O-ring from moving downward along with the shift shaft during the gear shifting operation, thus ensuring the sealing effect between the moving O-ring and the shift shaft cover.
[0025] In addition, this solution detachably and fixedly connects the sealing pressure plate to the bottom of the shift shaft cover plate, making it convenient to install and replace the moving O-ring after removing the sealing pressure plate.
[0026] Preferably, as an improvement, the top of the shift shaft cover plate has an upper countersunk hole at the position corresponding to the mounting hole, and the outer seal is pressed into the upper countersunk hole by means of an interference fit of the outer ring, and the upper lip and lower lip of the outer seal both cover the journal of the shift shaft.
[0027] Beneficial effects: This solution presses the outer seal into the upper countersunk hole with an interference fit, which can effectively achieve the seal between the outer seal ring and the shift shaft cover plate. Furthermore, by having both the upper and lower lips of the outer seal wrap around the journal of the shift shaft, the seal between the outer seal ring and the shift shaft can be effectively achieved. This, in turn, effectively achieves the seal between the shift shaft and the shift shaft cover plate, blocking small particulate solids such as mud, sand, and salt spray from entering the gearbox housing and damaging the moving O-ring, thereby ensuring the effectiveness of the seal between the shift shaft and the shift shaft cover plate. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.
[0029] Figure 2 for Figure 1 Top view.
[0030] Figure 3 for Figure 1 A schematic diagram of the structure of the middle shift shaft cover.
[0031] Figure 4 for Figure 1 Top view of the middle limit pressure plate.
[0032] Figure 5 for Figure 1 Bottom view of the central sealing pressure plate. Detailed Implementation
[0033] The following detailed description illustrates the specific implementation method:
[0034] The reference numerals in the accompanying drawings of the instruction manual include: gearbox housing 1, limit screw hole 101, limit screw 2, limit pressure plate 3, limit hole 301, stationary O-ring 4, outer seal 5, shift shaft 6, shift shaft cover plate 7, upper countersunk hole 701, lower countersunk hole 702, limit block 703, limit surface 704, sealing screw hole 705, sealing screw 8, sealing pressure plate 9, clearance hole 901, sealing hole 902, and moving O-ring 10.
[0035] The basic implementation examples are as follows: Figures 1 to 5 As shown:
[0036] An installation and sealing structure for an outboard motor shift shaft, as shown in the attached figure. Figure 1 As shown, the gearbox housing 1 includes a shift shaft cover 7 mounted on it. The shift shaft cover 7 has a vertically opening in the mounting hole communicating with the interior of the gearbox housing 1, into which the shift shaft 6 is slidably inserted. A limiting element is provided between the shift shaft cover 7 and the gearbox housing 1 to limit the shift shaft cover 7 to the gearbox housing 1. A static seal is provided between the shift shaft cover 7 and the gearbox housing 1, and a dynamic seal and an external seal 5 are provided between the shift shaft 6 and the shift shaft cover 7. The dynamic seal is installed on the side of the shift shaft cover 7 closest to the interior of the gearbox housing 1, and the external seal 5 is installed on the side of the shift shaft cover 7 closest to the exterior of the gearbox housing 1.
[0037] In the appendix Figure 1 Based on the combination Figure 2 and Figure 4 As shown, the limiting component includes a limiting pressure plate 3 and a limiting screw 2. The limiting pressure plate 3 abuts against the top of the shift shaft cover plate 7 and the gearbox housing 1. The limiting pressure plate 3 has a limiting hole 301 at the position corresponding to the gearbox housing 1, and the gearbox housing 1 has a limiting screw hole 101 at the position corresponding to the limiting hole 301. The limiting screw 2 passes through the limiting hole 301 and is threaded into the limiting screw hole 101. A limiting block 703 is coaxially fixedly connected to the top of the shift shaft cover plate 7. The limiting block 703 is fixedly connected to the shift shaft cover plate 7 by welding or integral molding. Limiting surfaces 704 are provided on opposite sides of the limiting block 703. In this embodiment, the limiting surfaces 704 are formed by milling the limiting block 703 flat. The right end of the limiting pressure plate 3 corresponding to the position of the shift shaft cover plate 7 is connected to the left end (within the left side). Figure 2 The limiting surface 704 (based on the perspective) is offset.
[0038] In the appendix Figure 1 Based on the combination Figure 3 and Figure 5The static seal is a static O-ring 4, a side wall of the shift shaft cover plate 7 is provided with a sealing groove in the circumferential direction, the static O-ring 4 is sleeved in the sealing groove, and the static O-ring 4 is in interference fit with the sealing groove and the gear box shell 1, that is, the static O-ring 4 is in interference fit with the shift shaft cover plate 7 and the gear box shell 1. The dynamic seal is a dynamic O-ring 10, a lower counterbore 702 is provided in the bottom of the shift shaft cover plate 7 at a position corresponding to the mounting hole, and the lower counterbore 702 is coaxially arranged with the mounting hole. The dynamic O-ring 10 is sleeved on the shift shaft 6 in the lower counterbore 702, and the dynamic O-ring 10 is in interference fit with the lower counterbore 702 and the shift shaft 6, that is, the dynamic O-ring 10 is in interference fit with the shift shaft cover plate 7 and the shift shaft 6.
[0039] The bottom of the shift shaft cover plate 7 is detachably fixedly connected with a sealing pressing plate 9, the sealing pressing plate 9 covers the lower counterbore 702, and the sealing pressing plate 9 is provided with a clearance hole 901 corresponding to the position of the shift shaft 6, and the shift shaft 6 is slidingly inserted into the clearance hole 901. Specifically, the sealing pressing plate 9 is symmetrically provided with two sealing holes 902 relative to the clearance hole 901, the shift shaft cover plate 7 is provided with sealing screw holes 705 corresponding to the positions of the sealing holes 902, sealing screws 8 are inserted into the sealing holes 902, and the sealing screws 8 are threadedly connected into the sealing screw holes 705 through the sealing holes 902.
[0040] The top of the limiting block 703 is provided with an upper counterbore 701 at a position corresponding to the mounting hole, and the upper counterbore 701 is coaxially arranged with the mounting hole. The outer seal 5 is pressed into the upper counterbore 701 in the form of outer circle interference fit, and the upper lip and the lower lip of the outer seal 5 wrap around the shaft neck of the shift shaft 6.
[0041] The specific implementation process is as follows:
[0042] When the outboard engine is working, the shift shaft 6 is pulled up and down to realize the gear shifting operation of the gear box. In this process, the static O-ring 4 is in interference fit with the shift shaft cover plate 7 and the gear box shell 1 to realize the axial static sealing between the shift shaft cover plate 7 and the gear box shell 1. The dynamic O-ring 10 is in interference fit with the shift shaft 6 and the shift shaft cover plate 7 to realize the dynamic sealing between the shift shaft 6 and the shift shaft cover plate 7. The outer seal 5 is pressed into the upper counterbore 701 in the form of outer circle interference fit to effectively realize the sealing between the outer seal 5 and the shift shaft cover plate 7. The upper lip and the lower lip of the outer seal 5 wrap around the shaft neck of the shift shaft 6 to effectively realize the sealing between the outer seal 5 and the shift shaft 6, thereby effectively realizing the sealing between the shift shaft 6 and the shift shaft cover plate 7, blocking the small particle solids such as mud and salt mist outside, avoiding the small particle solids such as mud and salt mist from eroding into the gear box shell 1 to damage the dynamic O-ring 10, and further ensuring the sealing effectiveness between the shift shaft 6 and the shift shaft cover plate 7.
[0043] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.
Claims
1. A mounting and sealing arrangement for a shift shaft of an outboard motor, characterized by: The gear shift shaft cover plate is installed on the gear box shell, and an installation hole communicating with the inside of the gear box shell is formed in the gear shift shaft cover plate, and the gear shift shaft is inserted into the installation hole; a static seal is arranged between the gear shift shaft cover plate and the gear box shell, a dynamic seal and an outer seal are arranged between the gear shift shaft and the gear shift shaft cover plate, the dynamic seal is installed on the side of the gear shift shaft cover plate close to the inside of the gear box shell, and the outer seal is installed on the side of the gear shift shaft cover plate close to the outside of the gear box shell.
2. The mounting and sealing structure of a shift shaft of an outboard engine according to claim 1, characterized in that: A limiting piece is arranged between the gear shift shaft cover plate and the gear box shell, and the limiting piece is used for limiting the gear shift shaft cover plate on the gear box shell.
3. The mounting and sealing structure of a shift shaft of an outboard engine according to claim 2, characterized in that: The limiting piece comprises a limiting pressing plate and a limiting screw, the limiting pressing plate abuts against the top of the gear shift shaft cover plate and the gear box shell, a limiting hole is formed in the limiting pressing plate corresponding to the position of the gear box shell, a limiting screw hole is formed in the gear box shell corresponding to the position of the limiting hole, and the limiting screw is threadedly connected in the limiting screw hole through the limiting hole.
4. The mounting and sealing structure of a shift shaft of an outboard engine according to claim 3, characterized in that: The top of the gear shift shaft cover plate is fixedly connected with a limiting block, limiting faces are arranged on the opposite sides of the limiting block, and the end of the limiting pressing plate corresponding to the position of the gear shift shaft cover plate abuts against the limiting face.
5. The mounting and sealing structure of a shift shaft of an outboard engine according to any one of claims 1 to 4, characterized in that: The static seal is a static O-shaped ring, a sealing groove is formed in the side wall of the gear shift shaft cover plate in the circumferential direction, the static O-shaped ring is sleeved in the sealing groove, and the static O-shaped ring is in interference fit with the sealing groove and the gear box shell.
6. The mounting and sealing structure of a shift shaft of an outboard engine according to claim 5, characterized in that: The dynamic seal is a dynamic O-shaped ring, a lower counterbore is formed in the bottom of the gear shift shaft cover plate corresponding to the position of the installation hole, the dynamic O-shaped ring is sleeved on the gear shift shaft in the lower counterbore, and the dynamic O-shaped ring is in interference fit with the lower counterbore and the gear shift shaft.
7. The mounting and sealing arrangement for a sterndrive shift shaft of claim 6, wherein: The bottom of the gear shift shaft cover plate is detachably fixed with a sealing pressing plate, the sealing pressing plate covers the lower counterbore, and a gap hole is formed in the sealing pressing plate corresponding to the position of the gear shift shaft, and the gear shift shaft is inserted into the gap hole.
8. The mounting and sealing structure of a shift shaft of an outboard engine according to claim 7, characterized in that: An upper counterbore is formed in the top of the gear shift shaft cover plate corresponding to the position of the installation hole, the outer seal is pressed into the upper counterbore in the form of outer circle interference fit, and the upper lip and the lower lip of the outer seal wrap around the shaft neck of the gear shift shaft.