Water pump impeller transmission structure for outboard engine

Abstract

The utility model discloses a water pump impeller transmission structure for an outboard engine, which comprises a transmission shaft and an impeller part in transmission connection with the transmission shaft, the impeller part is connected with the transmission shaft through a T-shaped key, and the T-shaped key comprises a base part connected with the transmission shaft and a protruding part connected with the impeller part. The width of the base part is larger than that of the protruding part, and the length of the base part and the length of the protruding part are consistent with the axial length of the impeller component. According to the water pump impeller transmission structure for the outboard engine, the strength can be improved, and the damage risk can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of outboard motors, and particularly relates to a water pump impeller transmission structure for an outboard motor. Background Art

[0002] The cooling water pump structure of the outboard motor is a centrifugal pump structure. As shown in Figure 1 and Figure 2 , the water pump impeller 200 and the transmission shaft 100 are usually connected by a keyway and a woodruff key 300. The transmission shaft 1 rotates at a high speed and transmits torque at the same time. The contact area between the key and the shaft is small. Due to high-speed operation and bearing a certain amount of force, especially in large-horsepower outboard motors, local stress concentration is likely to occur at the keyway of the transmission shaft due to processing or the raw material itself. The keyway becomes the weakest link of the transmission shaft. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a water pump impeller transmission structure for an outboard motor, which increases the contact area between the key and the shaft and reduces the risk of damage.

[0004] Based on the above problems, the technical solution provided by the utility model is as follows:

[0005] A water pump impeller transmission structure for an outboard motor, comprising a transmission shaft and an impeller component drivingly connected to the transmission shaft:

[0006] The impeller component is connected to the transmission shaft through a T-shaped key. The T-shaped key includes a base portion connected to the transmission shaft and a convex portion connected to the impeller component. The width of the base portion is greater than that of the convex portion. The lengths of the base portion and the convex portion are the same as the axial length of the impeller component.

[0007] In one embodiment, the base portion includes a flat portion attached to the transmission shaft and an arc-shaped portion attached to the impeller component. The radius of the arc-shaped portion is the same as the radius of the transmission shaft.

[0008] In one embodiment, an installation plane for placing the base portion is provided on the transmission shaft. Chamfered corners are respectively arranged at both ends of the installation plane in the length direction.

[0009] In one embodiment, the depth of the installation plane is one-fifth of the diameter of the transmission shaft.

[0010] In one embodiment, the contact area between the base portion and the installation plane is greater than 80%.

[0011] In one embodiment, a rounded transition portion is arranged at the connection between the flat portion and the arc-shaped portion.

[0012] In one embodiment, the impeller component includes a skeleton part and an impeller part arranged on the outer periphery of the skeleton part. The T-shaped key is matched with the skeleton part, and a positioning groove matching the convex part is arranged on the inner wall of the skeleton part.

[0013] In one embodiment, the skeleton part is a copper-based skeleton.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] 1. The impeller component and the transmission shaft are connected by a T-shaped key, which increases the contact area between the key and the shaft, reduces the pressure per unit area, and reduces the risk of damage.

[0016] 2. The impeller skeleton adopts a copper-based skeleton, and compared with nylon materials, the strength is increased by 50%, and it has reliable impact resistance and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. The following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is one of the schematic structural diagrams of the water pump impeller transmission structure in the prior art;

[0019] Figure 2 is the second schematic structural diagram of the water pump impeller transmission structure in the prior art;

[0020] Figure 3 is one of the schematic structural diagrams of the water pump impeller transmission structure embodiment of the present utility model for an outboard engine;

[0021] Figure 4 is the second schematic structural diagram of the embodiment of the present utility model;

[0022] Figure 5 is one of the schematic structural diagrams of the installation plane in the embodiment of the present utility model;

[0023] Figure 6 is the second schematic structural diagram of the installation plane in the embodiment of the present utility model;

[0024] Figure 7 is one of the schematic structural diagrams of the T-shaped key in the embodiment of the present utility model;

[0025] Figure 8 is the second schematic structural diagram of the T-shaped key in the embodiment of the present utility model;

[0026] Wherein:

[0027] 100, transmission shaft; 200, water pump impeller 300, semicircular key;

[0028] 1. Transmission shaft; 1-1. Installation plane; 1-1a. Chamfered corners;

[0029] 2. Impeller component; 2-1. Frame portion; 2-1a. Positioning groove; 2-2. Impeller portion;

[0030] 3. T-key; 3-1. base portion; 3-1a. plane portion; 3-1b. arc portion; 3-1c. rounded transition portion; 3-2. raised portion. DETAILED DESCRIPTION

[0031] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0032] See also Figure 3 and Figure 4 , which is a schematic diagram of the structure of an embodiment of the utility model, provides a water pump impeller transmission structure for an outboard motor, including a transmission shaft 1 and an impeller component 2 connected to the transmission shaft 1, and the impeller component 2 is driven to rotate by rotating the rotating shaft 1.

[0033] Specifically, the impeller component 2 is connected to the transmission shaft 1 via a T-key 3. Figure 7 and Figure 8 As shown, the T-key 3 includes a base portion 3-1 connected to the transmission shaft 1 and a protrusion 3-2 connected to the impeller component 2. The width of the base portion 3-1 is greater than the protrusion 3-2, and the lengths of the base portion 3-1 and the protrusion 3-2 are consistent with the axial length of the impeller component 2.

[0034] The impeller component 2 includes a skeleton portion 2-1 and an impeller portion 2-2 arranged on the outer periphery of the skeleton portion 2-1. A positioning groove 2-1a matching the protrusion 3-2 is provided on the inner wall of the skeleton portion 2-1. The skeleton portion 2-1 adopts a copper-based skeleton, which has improved strength compared to a nylon skeleton and has reliable wear resistance and impact resistance.

[0035] The base portion 3-1 includes a planar portion 3-1a fitted with the transmission shaft 1 and an arcuate portion 3-1b fitted with the skeleton portion 2-1, wherein the radius of the arcuate portion 3-1b is consistent with the radius of the transmission shaft 1, that is, the arcuate portion 3-1b and the transmission shaft 1 are located on the same outer circle.

[0036] In order to facilitate the installation of the T-key 3, Figure 5 and Figure 6As shown in the figure, an installation plane 1-1 for placing the base portion 3-1 is provided on the transmission shaft 1. The bottom of the installation plane 1-1 is a plane matching the base portion 3-1. Chamfered corners 1-1a are respectively provided at both ends in the length direction of the installation plane 1-1 to prevent stress concentration during processing or operation and improve the strength of the structure.

[0037] Preferably, the depth of the installation plane 1-1 is one-fifth of the diameter of the transmission shaft 1, which can meet the rotation transmission of the impeller while not losing strength.

[0038] In order to further improve the strength of the structure, a fillet transition portion 3-1c is provided at the connection between the plane portion 3-1a and the arc surface portion 3-1b to avoid right angles and reduce stress concentration.

[0039] The base portion 3-1 and the installation plane 1-1 have a contact area of more than 80% to ensure the strength of the structure.

[0040] In summary, this impeller transmission structure can increase the contact area between the key and the shaft, reduce emergency concentration, and improve the structural strength.

[0041] The above examples are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A water pump impeller transmission structure for an outboard motor, comprising a transmission shaft and an impeller component connected to the transmission shaft, characterized in that: The impeller component is connected to the transmission shaft via a T-key, and the T-key includes a base connected to the transmission shaft and a protrusion connected to the impeller component. The width of the base is greater than the protrusion, and the lengths of the base and the protrusion are consistent with the axial length of the impeller component.

2. The water pump impeller transmission structure for an outboard motor according to claim 1, characterized in that: The base portion includes a planar portion that fits the transmission shaft and an arcuate portion that fits the impeller component, and the radius of the arcuate portion is consistent with the radius of the transmission shaft.

3. The water pump impeller transmission structure for an outboard motor according to claim 2, characterized in that: The transmission shaft is provided with a mounting plane for the base portion to be placed therein, and both ends of the mounting plane in the length direction are respectively provided with chamfered corners.

4. The water pump impeller transmission structure for an outboard motor according to claim 3, characterized in that: The depth of the mounting plane is one fifth of the diameter of the transmission shaft.

5. The water pump impeller transmission structure for an outboard motor according to claim 3, characterized in that: The base portion has a contact area with the mounting plane that is greater than 80%.

6. The water pump impeller transmission structure for an outboard motor according to claim 2, characterized in that: A rounded transition portion is provided at the connection between the planar portion and the arcuate portion.

7. The water pump impeller transmission structure for an outboard motor according to claim 1, characterized in that: The impeller component includes a skeleton part and an impeller part arranged on the periphery of the skeleton part, the T-key cooperates with the skeleton part, and a positioning groove matching with the protrusion is arranged on the inner wall of the skeleton part.

8. The water pump impeller transmission structure for an outboard motor according to claim 7, characterized in that: The skeleton part is a copper-based skeleton.

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