JPH1199991A - Outboard engine connection structure through elastic mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To soften the buffer property of an elastic body against the vibration immediately after the start of an outboard engine and harden the buffer property of the elastic body when propelling. SOLUTION: Bolt members 101 are arranged on the right and left sides of a swivel shaft so as to project toward the side of an outboard engine body, and an elastic body 103 is arranged in the outer periphery of the bolt member 101 to connect the right and left parts of the outer board engine body and the bolt member through the elastic body 103. The shape of the elastic body 103 is made into non circle viewed from the direction to which the thrust of the outer board engine works, and in the face orthogonal to the direction to which the thrust of the elastic body 103 works, projected sections 103a-1 and 103a-1 are provided at a portion having a large distance from the bolt member in the axial direction of the bolt member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for connecting an outboard motor to a hull via an elastic mount.

[0002]

2. Description of the Related Art In general, an outboard motor has a so-called vertical engine having a vertically arranged crankshaft. The outboard motor includes a crankcase for accommodating the crankshaft in the front, a cylinder portion for forming the combustion chamber, and a cylinder head portion for the rear. So that
The outboard motor is connected to an extension. In the extension case, a vertical shaft for transmitting power from the engine to the propeller is disposed so as to be positioned vertically.

The structure of the part connecting the outboard motor and the hull is disclosed in Japanese Patent Application Laid-Open No. 56-116597, US Pat.
The grooves disclosed in U.S. Pat. No. 16,007, U.S. Pat. No. 3,002,489 or U.S. Pat. No. 3,500,594 are known. ,
In the structure disclosed in No. 007, rubber is interposed between the inner collar and the outer collar, and the inner collar is connected to one member and the outer collar is connected to the other member. In the structure disclosed in U.S. Pat. No. 3,002,489, three rubber pieces are interposed in each of upper and lower portions between members connected to each other. The structure disclosed in U.S. Pat. No. 3,500,594 has a structure in which cylindrical rubber is wound around a crossbar that penetrates the other member and has both ends fixed to one member. A belt-like rubber is interposed in a part of the member.

[0004]

In the connection structure between the hull and the outboard motor, the propulsion force of the outboard motor is effectively transmitted to the hull without waste at the time of propulsion. What does not transmit vibration to the hull is desired. For this reason, even in the above-described prior example, vibration is absorbed by interposing an elastic body in the connecting portion. However, since transmission of propulsion and prevention of vibration transmission are contradictory, a sufficient effect is obtained. Is not obtained. In addition, considerable effort is required to set the spring characteristics of the elastic body. Further, the following is another problem.

In a conventional outboard motor, the center line of vibration generated by the reaction force of the driving torque of the engine, that is,
The torque roll axis is substantially near the vertical axis or at a position slightly behind it. However, in the conventional connection structure, the position of the upper mount or the lower mount is restricted by the peripheral wall of the extension case spaced apart so as not to interfere with the vertical axis, and is set at a position somewhat separated from the torque roll axis. . As a result, the rigidity of the elastic body made of rubber or the like is increased, and the purpose of supporting the own weight of the outboard motor, the purpose of obtaining a favorable steering feeling, and the purpose of preventing transmission of vibration are simultaneously achieved. Making it difficult.

[0006]

According to a first aspect of the present invention, there is provided a hull bracket, and an outboard motor body rotatably supported on the bracket by a swivel shaft. A bracket provided on the swivel shaft and the outboard motor main body are connected via an elastic mount, and the connecting structure via the elastic mount of the outboard motor protrudes to the left and right sides of the swivel shaft toward the outboard motor main body. A bolt member is arranged, an elastic body is arranged around the outer periphery of the bolt member, and the left and right portions of the outboard motor main body and the bolt member are connected via an elastic body. The elastic member has a non-circular shape when viewed from the direction in which the thrust acts, and a surface of the elastic body perpendicular to the direction in which the thrust acts acts, and a portion of the bolt member having a large center distance between the bolt members is protruded in the axial direction of the bolt member. It is characterized by having a part

In the first aspect, the non-circular elastic member has a convex portion on the surface (front and rear surfaces) orthogonal to the thrust direction of the outboard motor. When the compressive force due to the thrust acts on the elastic body, the convex part can be easily deformed, soft cushioning characteristics can be obtained, and vibration can be absorbed, as compared with the case where partial contact by the part and full contact Can be.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIGS. 1 to 15 are views showing a first embodiment of the present invention, of which FIG. 1 is a view showing a rear part of a hull to which a connecting structure according to the present invention is applied, and FIG. FIG. 3 is an exploded perspective view, FIG. 3 is a perspective view of an extension case of the outboard motor, FIG. 4 is an enlarged side sectional view of a main part of a connection structure according to the present invention, FIG. FIG. 6 is a plan sectional view showing an attached state of the elastic body portion, and FIG.
6 is a sectional view taken along line BB of FIG. 6, FIG. 8 is a sectional view taken along line CC of FIG. 6, FIG. 9 is a plan sectional view of an extension case of the outboard motor, and FIG. FIG. 11 is an enlarged sectional view of the upper mount, and FIG.
FIG. 13 is a view taken along the line DD in FIG. 11, and FIG.
FIG. 14 is an exploded perspective view showing another embodiment of the lower mount, and FIG. 15 is an exploded perspective view showing another embodiment of the upper mount.

As shown in FIG. 1, a pair of left and right stern brackets 2 are fixed to a stern plate 1 a of a hull 1, and a swivel case 3 is vertically rotatable about a tilt shaft 4 between upper ends of the stern brackets 2. Pivot to As shown in FIG. 2, the swivel case 3 includes a mount frame 5 including a swivel shaft 5a rotatably provided for steering, and a center housing 5b spline-fitted to the upper end of the swivel shaft 5a. Then, the outboard motor A is mounted via the lower mounting means 100 and the upper mounting means 200. The base end is a stern bracket 2
Then, the outboard motor A is rotated up and down by extending and retracting the tilt cylinder 7 having the distal end connected to the swivel case 3.

Here, the outboard motor A has an outer portion composed of an extension case 8 and an engine cover 9, and a driving force of an engine 10 in the engine cover 9 is vertically penetrated through the extension case 8. The propeller shaft 12 is transmitted through the provided vertical shaft 11 to rotate the propeller 13. By the way, as described above, in the outboard motor, the center line of the vibration generated by the reaction force of the driving torque of the engine, that is, the torque roll axis is substantially near the vertical axis or at a position slightly behind it. .

Next, the lower mounting means 100 and the upper mounting means 200 will be described. First, the lower mounting means 100 will be described mainly with reference to FIGS. The lower mounting means 100 includes a center housing 6 (a perspective view of a single unit shown in FIG. 2) spline-fitted to a lower portion of the mount frame 5 as a member on the hull side.
) Are attached to the left and right sides of each of the cylindrical members 102 and 102 through a bolt 101. An elastic body portion 103, which is an elastic body constituting an elastic mount made of rubber or the like, is integrally formed on the outer periphery of each inner member 102 by baking or the like (see FIG. 6).

The cross section of the elastic body constituted by the elastic portion 103 is non-circular when viewed from the propulsion direction of the outboard motor (the front-rear direction of the outboard motor). Similarly, a cross section of an elastic body portion 203 described later is non-circular. The elastic part 103 is provided in the storage part 1 provided on the left and right parts of the extension case 8.
04, 104 (see FIG. 9 for the extension case alone), whereby the lower part of the outboard motor A is connected to the hull 1. The elastic body 103 is a rubber body 103
a, a forward stopper rubber portion 103b and a reverse stopper rubber portion 103c. Inside the rubber body 103a and the forward stopper rubber portion 103b, an inner member 102 is provided.
The flange portions 102a and 102b for restricting the deformation of the elastic body formed integrally with the elastic member are positioned to increase the rigidity in the compression direction and to transmit the propulsive force efficiently.

The cross section of the rubber body 1103a (a plane perpendicular to the direction in which the thrust of the outboard motor acts; that is, as viewed from the front and rear directions) is substantially rectangular as shown in FIG. Is formed by projecting the convex portion 103a-1 in the front-rear direction (axial direction of the bolt 101). Protrusions 103 on the left and right sides
a-2 was formed, and convex portions 103a-3 were formed on upper and lower surfaces. The left and right bolts 1
01 and 101 are provided at portions where the distance between the axes is large. That is,
The convex portion 103a-1 is connected to the bolt 101 of the rubber body 103.
Are provided at the four corners or at the four corners and the upper and lower end surfaces as shown in FIGS. 14 and 15 described later.

These projections 103a-1, 103a-
2, 103a-3 are partially brought into contact with the inner surfaces of the respective storage portions 104 provided on the left and right portions of the extension case 8. The partial contact makes it easier to deform and exerts a soft damping characteristic when the compression force acts, as compared with the case where the entire surface comes into contact, and absorbs vibration. In particular, the protruding portions 1103a-1 on the front and rear surfaces are completely crushed when the propulsion force is increased, and the front end surface or the rear end surface of the rubber main body 103a abuts entirely on the inner surface of the storage portion 104 and becomes rigid. And the transmission of forward or reverse propulsion is efficiently performed. In the example shown,
Although the elastic portion 103 is provided with a convex portion so as to partially contact the inner surface of the storage portion 104, a convex portion may be formed on the inner surface of the storage portion 1044 to partially contact the inner surface.

On the other hand, the storage portion 104 is formed by fitting a cover 106 made of resin or light alloy having sufficient rigidity from the outside into the concave portions 105 formed on both sides of the extension case 8. The recesses 105 and the cover 106 have protrusions 105 a and 106 protruding inward.
The end faces of the rubber main body 103a, the forward stopper rubber portion 103b, and the reverse stopper rubber portion 108c abut on the projections 105a and 106a. Then, in order to assemble the lower mounting means 100, with the covers 106 on both outer sides removed, the concave 105
Elastic member 1 integrally provided outside the inner member 102
After setting 03, the cover 106 is fixed.

FIG. 14 is an exploded perspective view showing another embodiment of the above-mentioned lower mount. In this embodiment, the elastic body 103 is housed in the front and rear housings 109 and 110, and is projected at four corners of the front and rear end faces (the plane orthogonal to the thrust direction of the outboard motor) of the elastic body 103. Protrusion 103a formed in upper and lower portions on front and rear end face sides
-2 is assumed to be continuous in the left-right direction (width direction), and the convex portion 103a-2 formed on the left and right side surfaces is assumed to have a middle portion cut in the height direction. Softer than the upper and lower ones.

Next, the upper mounting means 200 will be described mainly with reference to FIGS. 2, 4, and 11 to 13. FIG. The upper mounting means 200 is attached to the right and left mounting portions 5b on the upper part of the mount frame 5 as members on the hull side, and the cylindrical inner member 20 via bolts 201.
Install 2. An elastic portion 203 made of rubber or the like is integrally formed on the outer periphery of the inner member 202 by baking or the like. The elastic part 203 is housed in a housing part 204 provided in the extension case 8 and the cap 2
The upper end of the outboard motor A is connected to the hull 1 by the mount frame 5.

In the present embodiment, the storage portion 204 is recessed in the front-rear direction of the front wall facing the swivel case 3 of the member 8b connected to the extension case 8, and opens forward. Further, the cap 205 is
Of the extension case 8 is fixed to the front wall of the extension case 8 by a bolt 209 or the like at the flange portion 205b. The rear extension portion 205a of the cap 205 is provided with a contact surface 2 provided above and below the rear end surface.
05a-1 and the contact surface 205a-
A rear convex portion 205a that protrudes rearward by L3 from 1
2 is provided.

In the present embodiment, the storage portion 204 is in partial contact with the front end face of the elastic portion 203 connected to the extension case 8 when the engine is in a low rotation range, that is, when the propulsion force is small. The convex portion 203a-1 for performing the vibration absorption is formed by the flat portion 20 formed on the left and right sides thereof.
3a-2, it is formed to protrude forward by L4.
-3 was formed. The structure of the front end face of the elastic body portion 203 is shown in FIG. Then, the contact portion 205 of the cap 205
The convex portion 203a-1 of the elastic portion 203 abuts on the a-1 and the flat portion 203a-2 of the elastic portion 203 is positioned on the rear convex portion 205a-2 of the cap 205 by a distance L4-L3. Separate and face with. For example, the displacement of the outboard motor A due to the change in its load while the outboard motor A is moving backward is shown in FIG.
As shown in FIG.

FIG. 15 is an exploded perspective view showing another embodiment of the upper mount 200. As shown in FIG. In this example,
The cylindrical inner member 20 attached via the bolt 201
An elastic body portion 203 is provided on the outer periphery of
06, 207, and at the top and bottom of the front and rear end surfaces of the elastic body portion 203, a substantially trapezoidal projection 203a-1.
Was formed. The convex portions 203a-1 provided on the front and rear end surfaces of the elastic body portion 203 are in contact with the inner surfaces of the storage portions 206 and 207 facing each other to form a contact portion.

As shown in FIGS. 8 and 13, when viewed from the thrust direction of the outboard motor, the elastic members 103 and 203 have a smaller horizontal dimension L2 than a vertical dimension L1. As shown in FIG. 5, the vertical shaft 11 shown in FIG. 1 is located between the left and right bolts 101, 101, and the torque roll shaft is substantially near the vertical shaft 11 or behind it. . Elastic body portions 103 and 20 constituting an elastic body
The cross section of No. 3 is non-circular as described above, and the vertical dimension L1 and the horizontal dimension L2 satisfy L1> L2.

As a result, the distance between the left and right bolts 101 and 101 (the left and right bolts 201 in the case of the upper mount) having the elastic portions 103 and 203 can be made as close as possible. That is, the left and right bolts 10
1, 101 can be brought close to the vertical axis 11 arranged between them, ie substantially vertical axis 1
In the vicinity of or slightly behind the torque roll shaft. As a result, the elastic mount is relatively soft, and the vibration isolation effect is improved. Therefore, the buffer characteristic in the left-right direction as a whole during low-speed operation of the engine can be made soft.

As shown in FIG. 10, this is applied to an upper mount 200, and left and right lower mounts 100, 100 are provided.
From the distance L100 between the left and right upper mounts 200,
L200 was reduced during 200. Thus, L100>
By setting L200, the upper mount 200, 200
As a whole, as described above, the conventional hardness can be maintained and the favorable steering feeling can be obtained by using the upper mount alone while setting so as to exhibit a soft cushioning characteristic. When the elastic portion 103 has a rectangular parallelepiped shape, if it is desired to soften the buffer characteristics in the vertical direction, the elastic portion 103 can be turned around 90 ° and housed in the housing.

Next, a second embodiment will be described with reference to FIGS. Here, FIG. 16 is a side sectional view similar to FIG. 4 showing the second embodiment, FIG. 17 is a sectional view taken along line FF of FIG. 16, and FIG. 18 is a sectional view taken along line GG of FIG. FIG.
FIG. 20 is a view of the lower mount as viewed from the front, and FIG.
FIG. 21 is a sectional view taken along the line II in FIG. 19. Note that members common to the first embodiment are assigned the same reference numerals and description thereof is omitted.

In the second embodiment, similarly to the first embodiment, the center housing 6 below the mount frame 5 is provided.
Amount means 100 and upper mount means 20
0, an outboard motor A is attached. The lower mounting means 100 is, as in the first embodiment, provided with a mount frame 8.
A bolt 101 as an inner member having a flange portion 101a is attached to each of the left and right sides of the lower center housing 6, and an elastic body portion 103 made of rubber or the like is integrally formed on the outer periphery of the bolt 101 by baking or the like. The elastic body 103 is housed in a housing 104 provided in the extension case 8.

In the second embodiment, the first
The forward stopper rubber portion and the reverse stopper rubber portion as in the embodiment are not provided, and the front end surface of the elastic body portion 103 is provided with
Convex portion 10 for absorbing vibration when propulsion is small
3a-1 are provided, the upper and lower surfaces are flat, the left and right surfaces are formed with concave grooves 103a-3, and a part of the storage part 104 is formed as a concave part 104a. A gap 106 is formed between the surface and the surface, so that the inner surface of the storage section 104 and the surface of the elastic body 103 partially abut.

On the other hand, the upper mounting means 200 is provided on the left and right of the upper part of the mount frame 5 as a member on the hull side.
A bolt 201 as an inner member having a flange portion 201a is attached, and an elastic portion 203 is integrally formed on the outer periphery of the bolt 201.
Is stored in a storage section 204 provided in the extension case 8 and is closed by a cap 205. As shown in FIGS. 19 to 21, the elastic portion 203 has a vertical dimension Ll.
When the propulsion force is small, a convex portion is formed on the front end surface of the elastic portion 203 to partially abut and to sufficiently absorb vibration. A convex portion is not formed in order to firstly support the weight rather than absorb minute vibration in the vertical direction, and a concave groove 203a is formed in the left and right side surfaces. -3, and the storage portion 20
4 is a concave portion 204a, a gap 206 is formed between the inner peripheral surface of the storage member and the outer peripheral surface of the elastic body 203, and the inner surface of the storage portion 204 and the surface of the elastic pair portion 203 are in partial contact with each other. I have.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. In claim 1, the bracket of the hull, the outboard motor body supported to be rotatable left and right around the swivel shaft on the bracket, the bracket provided on the swivel shaft and the outboard motor body, In the connection structure of the outboard motor connected through the elastic mount via the elastic mount, a bolt member protruding toward the outboard motor main body is disposed on the left and right sides of the swivel shaft, and an elastic body is disposed on the outer periphery of the bolt member. Then, the left and right portions of the outboard motor main body and the bolt member are connected via an elastic body, and the shape of the elastic body is made non-circular when viewed from the direction in which the thrust of the outboard motor acts. On the surface orthogonal to the direction in which the thrust acts, convex portions in the axial direction of the bolt member were provided at portions where the distance between the axes of the bolt members was large, and these convex portions abutted on the outboard motor side. At this time, the projections will be in partial contact with each other, As compared with the case where a surface in contact with,
When the compression force acts, it is easily deformed, exhibits a soft cushioning property, and absorbs vibration. When the propulsion force increases, the protrusions on the front and rear surfaces of the elastic body are completely crushed, and the front end face or the rear end face of the elastic body comes into full contact with the outboard motor side, and the stiffness increases. Or, the transmission of the reverse propulsion is efficiently performed.

Therefore, when the propulsion force from the outboard motor is not so large, for example, immediately after the start of the outboard motor, the elastic body partially abuts on the abutting portion on the outboard motor side, and the front-back direction ( It exhibits a soft buffering characteristic in the direction of transmission of the propulsion force) and can sufficiently absorb vibration. Also, when the propulsion force transmitted from the outboard motor to the hull increases, the protrusions are crushed, and the front and rear surfaces of the elastic body abut the entire outboard motor side, exhibiting rigid characteristics in the front and rear direction, resulting in waste. Effective propulsion force can be transmitted without any trouble.

[Brief description of the drawings]

FIG. 1 is a view showing a rear part of a hull to which a connection structure according to the present invention is applied.

FIG. 2 is an exploded perspective view around a swivel case.

FIG. 3 is a perspective view of an extension case of the outboard motor.

FIG. 4 is an enlarged side sectional view of a main part of a connection structure according to the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a cross-sectional plan view showing an attached state of an elastic body portion.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is a plan sectional view of an extension case of the outboard motor.

FIG. 10 is a partial cross-sectional view of the outboard motor as viewed from the front.

FIG. 11 is an enlarged sectional view of an upper mount.

FIG. 12 is a view taken in the direction of arrows DD in FIG. 11;

FIG. 13 is a view taken along the line EE in FIG. 11;

FIG. 14 is an exploded perspective view showing another embodiment of the lower mount.

FIG. 15 is an exploded perspective view showing another embodiment of the upper mount.

FIG. 16 is a side sectional view similar to FIG. 4, showing a second embodiment;

FIG. 17 is a sectional view taken along line FF of FIG. 16;

18 is a sectional view taken along line GG of FIG.

FIG. 19 is a view of the lower mount as viewed from the front.

20 is a sectional view taken along line HH of FIG. 19;

21 is a sectional view taken along line II of FIG. 19;

FIG. 22 is a graph showing a relationship between displacement and load.

[Explanation of symbols]

1: Hull, 5: Frame constituting swivel shaft, 1
00: Upper mount, 103: Elastic body, 103a
-1,203a-1: convex portion, A outboard motor.

[Procedure amendment]

[Submission date] August 27, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Next, the lower mounting means 100 and the upper mounting means 200 will be described. First, the lower mounting means 100 will be described mainly with reference to FIGS. Roama down DOO means 100, the lower portion of the mount frame 5 described above as members of the hull, the right and left on each spline fitted center housing 6 (a perspective view of a single shown in FIG. 2), bolts 101, 101 Through the cylindrical inner member 1 such as a light alloy having sufficient rigidity
02 and 102 are attached. An elastic body portion 103, which is an elastic body constituting an elastic mount made of rubber or the like, is integrally formed on the outer periphery of each inner member 102 by baking or the like (see FIG. 6).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017] Next, up Pamaunto means 200 2, 4, and will be described with mainly to FIGS. The upper mounting means 200 is provided with a cylindrical inner member 202 via bolts 201 on left and right mounting portions 5b on the upper part of the mount frame 5 as a member on the hull side.
Install. An elastic portion 203 made of rubber or the like is integrally formed on the outer periphery of the inner member 202 by baking or the like. The elastic part 203 is housed in a housing part 204 provided in the extension case 8,
The upper part of the outboard motor A is connected to the hull 1 by the mount frame 5.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

[0020] FIG. 15 is an exploded perspective view showing another embodiment of Appama down bets 200. In this embodiment, a cylindrical inner member 202 attached via a bolt 201
An elastic portion 203 is provided on the outer periphery of the
6 and 207, and a substantially trapezoidal convex portion 203a-1 was formed at the upper and lower ends of the front and rear end surfaces of the elastic body portion 203. Convex portions 2 provided on front and rear end surfaces of elastic body portion 203
03a-1 is in contact with the inner surfaces of the storage portions 206 and 207 facing each other to form a contact portion.

 ──────────────────────────────────────────────────の Continuation of the front page (72) Inventor Akihisa Saito 1-4-1, Chuo, Wako-shi, Saitama Pref.

Claims (1)

[Claims] 1. A bracket of a hull, and an outboard motor main body rotatably supported on the bracket so as to be rotatable left and right about a swivel shaft. The bracket provided on the swivel shaft and the outboard motor main body are formed by: In the connection structure of the outboard motor connected via the elastic mount via an elastic mount, a bolt member protruding toward the outboard motor main body is disposed on the left and right sides of the swivel shaft, and an elastic body is provided on an outer periphery of the bolt member. And the left and right portions of the outboard motor main body and the bolt member are connected via an elastic body. The shape of the elastic body is non-circular when viewed from the direction in which the thrust of the outboard motor acts. An elastic mount for an outboard motor, wherein a convex portion in the axial direction of the bolt member is provided at a portion of the body where the axial distance is large on a surface orthogonal to the direction in which the thrust acts on the body. Connection structure via.