WO2009082877A1

WO2009082877A1 - A motorcycle water-cooling engine

Info

Publication number: WO2009082877A1
Application number: PCT/CN2008/001350
Authority: WO
Inventors: Yong Gao; Tao Liu
Original assignee: Loncin Industry Co., Ltd
Priority date: 2007-12-28
Filing date: 2008-07-22
Publication date: 2009-07-09
Also published as: CN101215985B; CN101215985A

Abstract

A motorcycle water-cooling engine is provided, in which a water pump is mounted on an engine cylinder block (2) and a water pump gear (3) is driven by a timing chain (4). A drainage passage (9) of the water pump is linear passage and faces an outlet in radial direction of an impeller (10) of the water pump. An inlet passage (11) provided in the engine cylinder (2) connects the drainage passage (9) of the water pump and a water-cooling passage of the cylinder (2). A center line of the inlet passage (11) of the engine cylinder (2) connects tangentially with the water-cooling passage of the cylinder. Technical effect of the engine can be obtained as follows: installation structure and driving model of the water pump are more reasonable, resistance of the drainage passage is lower, installation and maintain of the water pump are convenient, cooling effect is better under the same output power of the water pump and manufacture cost of the engine in total is less.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine, and more particularly to a motorcycle water-cooled engine. BACKGROUND OF THE INVENTION Water pumps for existing motorcycle water-cooled engines are typically mounted on the right cover of the crankcase and are driven by a crankshaft, oil pump or clutch gear. 1 is a schematic view showing an assembly structure of a water pump driven by a crankshaft in a conventional motorcycle water-cooled engine. The water pump is composed of a water pump body 6, a water pump cover 15, a water pump shaft 7, an impeller 10, and a water pump gear 3, etc. The outer diameter of the water pump body 6 is large. When assembling, the pump gear 3 and the rest of the water pump assembly can only be installed separately, that is, after installing the rest of the water pump assembly on the right tank cover, the water pump gear is connected. On the water pump shaft; the same applies to the maintenance of the water pump. First, open the right cover 16 and remove the water pump gear 3 from the water pump shaft before removing the rest of the water pump assembly from the right cover 16 as shown. The installation and maintenance of the pump must open the right cover 16, which is not only time-consuming and laborious, but also inconvenient to operate, and opening the cover of the right case 16 is likely to cause oil leakage. In addition, the water outlet of the pump chamber 17 of the water pump of the existing motorcycle water-cooled engine and the water outlet 9 of the water pump body 6 are misaligned with each other, and the water coming out of the pump chamber 17 needs to change direction twice to flow out of the water pump, and the flow of the 7j flow The resistance is large, and the water flow rate into the engine block is low. On the one hand, the cooling effect of the engine is poor. On the other hand, the pump has to work for a long time at a high rotation speed, and the life of the water pump is shortened and the reliability is lowered. SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a motor-cooled engine with improved design. The installation and driving structure of the water pump on the engine is more reasonable, the installation and maintenance of the water pump are convenient, and the cooling effect of the engine is better. In order to solve the above technical problem, the present invention provides a motorcycle water-cooled engine in which the coolant in the water tank is delivered to the cooling water passage of the engine through a water pump. The key is that the water pump is mounted on the engine rainbow, and the water pump gear is driven by the timing chain. In the invention, the installation position of the water pump is changed from the traditional crankcase right cover to the engine rainbow body, and the water pump

1 P20980 The gear is driven by the timing chain. This is a brand-new installation structure and driving method, which solves the problem that the original pump needs to open the right cover of the crankcase. In the existing motorcycle water-cooled engine, the water pump gear is packaged inside the right cover of the crankcase. After the water pump is installed on the engine's rainbow body, the tank structure for encapsulating the water pump gear can be connected with the water pump, and the whole assembly time. The pump is connected to the engine block as a whole. The 7J pump is also removed from the engine block as a whole, which makes the installation and maintenance work more convenient and more efficient. The box structure used to package the pump gear can also be done. It is integrated with the engine's rainbow body, but it needs to be equipped with a cover on the box to disassemble the water pump gear. Therefore, the process of opening the cover must be installed when installing and repairing the water pump, but it is installed on the right cover of the crankcase. Compared with the structure, the cover is relatively small, and it is convenient and quick to operate, and it is far from the crankcase, and it is not easy to leak oil. In the invention, the water pump outlet can be directly connected with the cooling water channel on the engine block, thereby eliminating the need to connect the water pipe and the clamp, etc., and the manufacturing cost can be reduced, and the sealing at the joint is also more reliable. The engine block is mounted with a double bridge wheel, the double bridge wheel is composed of a sprocket and a gear, wherein the large gear meshes with the timing chain, and the gear meshes with the water pump gear. The timing chain drives the water pump gear through the double bridge wheel, and the engagement of the bridge wheel and the timing chain can replace one of the timing chain guide plates, thereby helping to reduce the cost. The mounting surface of the water pump body matched with the engine rainbow body is parallel to the axis line of the water pump shaft, and the bolt hole on the water pump body for connecting with the engine body is perpendicular to the axis line of the water pump shaft, and the water pump is installed in the engine cylinder After the body, the end face of the pump gear is parallel to the timing chain, which simplifies the gearing between the pump gear and the timing chain. If the space allows, the timing chain can be directly meshed with the pump gear. The water outlet of the water pump is a straight passage and is opposite to the radial water outlet end of the water pump impeller. The engine block is provided with a water inlet to connect the water pump outlet to the cooling water passage on the cylinder. The center line of the engine rainbow body inlet is connected to the cooling water channel. Under the centrifugal force of the pump impeller, the coolant is pumped out from the radial outlet end of the impeller, and then the DC is introduced into the water channel. The water flow is not directly changed in the water outlet, and is directly input into the cooling water channel of the engine block from the tangential direction. In the middle, the resistance is small. Under the condition that the pump impeller rotates at the same speed, the water flow speed and water pressure entering the cooling channel are higher, so the cooling effect of the engine is better. The technical effects obtained by the invention are as follows: The installation structure and the driving method of the water pump are more reasonable, the installation and maintenance operation of the water pump is convenient and fast, and the cooling effect of the engine is good under the same pump output power, and the manufacturing cost of the whole engine is lower. .

2 P20980 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a mounting structure and a driving manner of a conventional water pump of a motorcycle; FIG. 2 is a schematic structural view of the present invention; FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 (the crankcase portion is omitted). The present invention will be further described with reference to the accompanying drawings and embodiments. As shown in FIG. 2, the motorcycle water-cooled engine provided by the present invention has a cylinder block 2 and a water pump assembly, etc., and the water pump assembly is mounted on the cylinder block 2, and the cylinder block 2 A double bridge wheel 5 is disposed between the timing chain 4 and the water pump gear 3. The double bridge wheel 5 is composed of a sprocket and a gear, wherein the sprocket meshes with the timing chain 4, and the gear meshes with the water pump gear 3. The power on the timing chain 4 is transmitted to the water pump gear 3 through the double bridge wheel 5 to drive the water pump assembly to operate. As shown in FIG. 3, the water pump assembly is composed of a water pump body 6, a water pump cover 15, a water pump shaft 7, an impeller 10, a water pump gear 3, and the like. The water pump cover 15 is bolted to the end surface of the water pump body 6 to form a pump chamber 17, a water pump. A seal ring 23 is disposed between the cover 15 and the contact end surface of the water pump body 6. The impeller 10 is mounted at one end of the water pump shaft 7 and located in the pump chamber 17, the water pump gear 3 is mounted at the other end of the water pump shaft 7, and the water pump shaft 7 passes through the bearing Installed in the water pump body 6, a water seal assembly is installed between the water pump shaft 7 and the inner wall of the water pump body 6. The water pump 21 and the water outlet 9 are connected to the pump chamber 17, and the water inlet 21 is mainly composed of the inner cavity of the water inlet nozzle 18. Formed, the water inlet nozzle 18 is connected to the water pump cover 15, and the water outlet 9 is disposed on the water pump body 6 and integrated with the water pump body 6. The mounting surface L of the water pump body 6 which cooperates with the red body 2 is parallel to the axial line of the water pump shaft 7, and the bolt hole 8 of the water pump body 6 for connecting with the rainbow body 2 is perpendicular to the mounting surface L, the water pump body 6 One end corresponding to the water pump gear 3 is provided with a support 13 having a box structure, the water pump gear 3 is located in the cavity of the support 13, and the support 13 is also provided with a bolt hole connected to the cylinder 2. Referring to Fig. 3, when the engine is assembled, bolts 8, 19 are respectively passed through the bolt body of the water pump body 6, the support 13, and a seal ring is arranged between the support 13 and the cylinder block 2, and the water pump assembly is used as a whole and the cylinder The body 2 is connected, and the operation is more convenient during installation and maintenance. A sealing ring 24 is installed between the pump body 6 and the contact surface of the support 13 . After assembly, the support 13 and the cylinder block 2 enclose a water pump gear 3 and a double bridge. The closed cavity of the wheel 5. It is also possible to integrally mount the support 13 on the cylinder block 2, and it is only necessary to provide a cover plate slightly larger than the water pump gear 3 on the support 13, and open the cover on the support 13 to the water pump gear during installation and maintenance. 3 disassembly and assembly, which is related to the installation of the water pump of the existing motorcycle water-cooled engine

3 P20980 Compared with the structure, it is also convenient and labor-saving to operate. As can be seen from Fig. 3, the water outlet 9 of the water pump is a straight passage and is opposite to the radial water outlet end of the impeller 10, and the water outlet 9 is directly connected to the cooling water passage 1 on the rainbow body 2, and the engine block 2 is provided with The water inlet 11 connects the water pump outlet 9 to the cooling water channel 1 on the cylinder block 2, thereby eliminating the need for the original connecting water pipe, the clamp, and the like, and reducing the manufacturing cost. The center line of the water inlet 11 of the engine block 2 is tangentially connected to the cooling water channel 1, and the coolant in the pump chamber 17 is taken out from the radial outlet end of the impeller 10 by the centrifugal force of the impeller 10, and then the DC inlet and outlet channels are In the water outlet 9, the water flow is not directly changed in the water outlet 9, and is directly tangentially input into the cooling water passage 1 in the cylinder block 2, so that the resistance is small, and the water flow rate into the cylinder block 2 is faster under the condition that the rotational speed of the impeller 10 is the same. The engine has a better cooling effect. Figure 3 shows that the water outlet 9 end surface and the outer side wall of the water pump are respectively provided with sealing ports 12, 22 between the engine red body 2, the sealing port 12 is an end face seal, and the sealing ring 22 is a radial seal, in the water outlet of the water pump 9 An end face and a radial double seal structure are used between the engine red body 2 to make the seal between them more reliable. It can also be seen from Fig. 3 that the winter water discharge hole 14 communicating with the cooling water channel 1 on the engine is located at the bottom end of the water channel of the cylinder block 2. The aperture of the water discharge hole 14 can be processed slightly larger as needed, so that not only water discharge is convenient, It is also convenient to maintain and clean the waterway, which is conducive to the smooth elimination of dirt in the water cooling channel in the engine.

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Claims

Claim

A motorcycle water-cooled engine in which a coolant in a water tank is delivered to a cooling water passage of an engine by a water pump, characterized in that: the water pump is mounted on an engine rainbow body (2), and the water pump gear (3) is provided by a timing chain (4) Drive.

2. The motorcycle water-cooled engine according to claim 1, wherein: the engine block (2) is mounted with a double bridge wheel (5), and the double bridge wheel (5) is geared and The sprocket is constructed, wherein the sprocket meshes with the timing chain (4), and the gear meshes with the water pump gear (3).

The motorcycle water-cooled engine according to claim 1 or 2, characterized in that: the mounting surface (L) of the water pump body (6) of the water pump and the engine block (2) is parallel to the water pump shaft

The shaft line of (7), the bolt hole on the pump body (6) used to connect with the engine's rainbow body (2) is perpendicular to the shaft line of the pump shaft (7).

4. The motorcycle water-cooled engine according to claim 3, wherein: the water outlet (9) of the water pump is a straight passage and is opposite to the radial outlet end of the water pump impeller (10), the engine block (2) A water inlet (11) is provided to connect the water pump outlet (9) to the cooling water channel (1) on the cylinder (2).

5. The motorcycle's water-cooled engine according to claim 4, characterized in that: the center line of the water inlet (11) of the engine block (2) and the cooling water channel (1) and the water pump outlet (9) center line There is a tangent connection between them.

The motorcycle water-cooled engine according to claim 4, characterized in that: a seal ring (1 ² , 22 ) is respectively arranged between the end surface and the outer side wall of the water pump outlet (9) and the engine rainbow body (2) .

7. The motorcycle water-cooled engine according to claim 1, wherein: the water pump body (6) is provided with a seat (13) having a box structure corresponding to one end of the water pump gear (3), a water pump gear

(3) Located in the cavity of the support (13), the support (13) is connected to the engine rainbow body (2) by bolts.

The motorcycle water-cooled engine according to claim 1, characterized in that: the winter drain hole (14) on the engine is located at the bottom of the cylinder (2) and communicates with the cooling water passage (1).

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