TWI435977B - Oil pump drive mechanism - Google Patents

Description

Oil pump drive mechanism

The invention relates to an oil pump transmission mechanism, in particular to an oil pump transmission mechanism for an engine.

In the engine design of the traditional locomotive, in order to smoothly lubricate all parts of the engine and reduce the temperature during the high-speed operation of the engine, it is necessary to take the oil from the oil pump and then deliver the oil to all parts of the engine through the specially planned oil passage. For lubrication and cooling purposes. Among them, from the start of the oil pump to the conventional oil passage of the cam above the cylinder, it can be divided into an external oil passage exposed outside the engine cylinder, and a cylinder bolt through the lock cylinder block and the cylinder head. The built-in oil passage formed by the hole.

The driving power of a general oil pump is derived from the rotational power of the crankshaft, for example, through a chain to achieve power transmission.

Further, in the engine for a vehicle, the piston is coupled to the crankshaft in the crankcase through the connecting rod, and operates in a reciprocating manner when the piston is pushed by the power of the gas explosion. In order to make the crankshaft move in a circular motion, the connection between the connecting rod and the crankshaft is achieved by the weight design, so that it is connected in an eccentric manner. In this way, the piston pushes the thrust to the weight of the crankshaft by the connecting rod, thereby causing the circular motion of the crankshaft. However, due to its inertial force, the counterweight will cause vibration when the crankshaft is actuated, and it will become more and more obvious with the crankshaft speed. In order to maintain the operation of the crankshaft in a relatively stable state, a balance shaft is set beside the crankshaft. A balance shaft drive gear is arranged on the crankshaft, and a balance shaft driven gear is arranged on the balance shaft, and the crankshaft and the balance shaft are connected by the two gears meshing with the above. Thereby, when the crankshaft is driven by the piston and the connecting rod, the vibration generated by the counterweight due to the inertial force can be effectively eliminated.

Referring to Figure 1, there is shown a cross-sectional view of a conventional engine crankcase. As can be seen from the above, the conventional engine structure requires an oil pump drive sprocket 2 and a balance shaft drive gear 3 to be coupled to the crankshaft 1 to transmit power to the oil pump 4 and the balance shaft 5, respectively. In this way, the length of the total thickness of the two wheel members is reserved in the longitudinal direction of the crankshaft 1, which hinders the shortening of the crankshaft and the miniaturization of the engine.

The main object of the present invention is to provide an oil pump transmission mechanism for an engine, which can reduce the overall size of the engine and achieve miniaturization.

To achieve the above objective, the oil pump transmission mechanism of the present invention comprises a crankshaft, a balance shaft, an auxiliary shaft and an oil pump, wherein the oil pump comprises an oil pump passive sprocket.

The balance crankshaft is provided with a balance shaft drive gear, and the balance shaft is provided with a balance shaft driven gear, and the balance shaft passive gear meshes with the balance shaft drive gear.

The auxiliary shaft is provided with an oil pump passive gear and an oil pump drive sprocket. The oil pump passive gear meshes with the balance shaft drive gear, and a drive chain is wound around the oil pump drive sprocket and the oil pump passive sprocket to transmit rotational power between the two.

With the above mechanism design, the total length of the crankshaft can be shortened due to the reduction of the setting of the oil pump drive sprocket on the crankshaft, and the engine size can be further reduced in this axial direction.

The engine may include a crankcase that is a combination of a left crankcase half and a right crankcase half, and the crankshaft, the balance shaft, the auxiliary shaft, and the oil pump are all mounted in the crankcase.

The balance shaft and the auxiliary shaft may be respectively carried by the left ball bearing half body and the right crankcase half body through the two ball bearings. The crankshaft can be carried by the two-plane bearing to the left crankcase half and the right crankcase half, respectively.

The oil pump driven gear and the oil pump drive sprocket can be placed on opposite sides of one of the two ball bearings on the auxiliary shaft.

Referring to Figures 2 and 3, there is shown a cross-sectional view of the engine crankcase and a plan view of the respective wheel members in a preferred embodiment. In this embodiment, the oil pump transmission mechanism is mounted on a locomotive engine, and the engine includes a crankcase formed by combining a left crankcase half 11a and a right crankcase half 11b. The oil pump transmission mechanism includes a crankshaft 12, a balance shaft 13, an auxiliary shaft 14, an oil pump 15, and a transmission chain 16. Both ends of the crankshaft 12 are carried by the left crankcase half 11a and the right crankcase half 11b through two planar bearings 21a, 21b spaced apart by a certain distance. Similarly, the balance shaft 13 is carried by the two ball bearings 22a, 22b respectively to the left crankcase half 11a and the right crankcase half 11b, and the auxiliary shaft 14 is carried by the two ball bearings 23a, 23b, respectively, to the left crankcase half 11a. With the right crankcase half 11b.

Of course, the axes of rotation of the crankshaft 12, the balance shaft 13, the auxiliary shaft 14, and the oil pump 15 are substantially parallel. The balance shaft 13 is provided with a balance shaft drive gear 121. The balance shaft 13 is coaxially provided with a balance shaft driven gear 131. The auxiliary shaft 14 is coaxially provided with an oil pump driven gear 141 and an oil pump drive sprocket 142.

In particular, the balance shaft drive gear 121 on the crankshaft 12 simultaneously meshes with the balance shaft driven gear 131 on the balance shaft 13 and the oil pump driven gear 141 on the auxiliary shaft 14.

The oil pump drive sprocket 142 on the auxiliary shaft 14 corresponds to one of the oil pump passive sprocket 151 of the oil pump 15, and is simultaneously wound around the oil pump drive sprocket 142 and the oil pump driven sprocket 151 by a drive chain 16. In order to pass the power. In this example, the oil pump driven gear 141 and the oil pump drive sprocket 142 are respectively disposed on opposite sides of the ball bearing 23b of the auxiliary shaft 14, so as to allow the oil pump 15 to overlap the three components in the axial direction as much as possible, thereby obtaining better space utilization.

As can be seen from the above, when the crankshaft 12 rotates, the following balance shaft drive gear 121 simultaneously drives the balance shaft driven gear 131 and the oil pump driven gear 141, so that the balance shaft 13 and the auxiliary shaft 14 also rotate together. On the other hand, since the oil pump drive sprocket 142 rotates synchronously with the auxiliary shaft 14, the oil pump driven sprocket 151 receives the rotational power through the drive chain 16, that is, the drive oil pump 15 operates.

An advantage of the present invention is that because the arrangement of the oil pump drive sprocket is reduced on the crankshaft, it means that the crankshaft length can be shortened, reducing the necessary size of the engine along the length of the crankshaft, making the engine more compact.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1. . . Crankshaft

2. . . Oil pump drive sprocket

3. . . Balance shaft drive gear

4. . . Oil pump

5. . . Balance axis

11a. . . Left crankcase half

11b. . . Right crankcase half

12. . . Crankshaft

121. . . Balance shaft drive gear

13. . . Balance axis

131. . . Balance shaft driven gear

14. . . Auxiliary axis

141. . . Oil pump passive gear

142. . . Oil pump drive sprocket

15. . . Oil pump

151. . . Oil pump passive sprocket

16. . . Drive chain

21a, 21b. . . Plane bearing

22a, 22b, 23a, 23b. . . Ball bearing

Figure 1 is a cross-sectional view of a conventional engine crankcase.

2 is a cross-sectional view of the crankcase of the engine in accordance with a preferred embodiment of the present invention.

Figure 3 is a plan view showing the arrangement of the wheel members of the oil pump transmission mechanism in accordance with a preferred embodiment of the present invention.

11a. . . Left crankcase half

11b. . . Right crankcase half

12. . . Crankshaft

121. . . Balance shaft drive gear

13. . . Balance axis

131. . . Balance shaft driven gear

14. . . Auxiliary axis

141. . . Oil pump passive gear

142. . . Oil pump drive sprocket

15. . . Oil pump

151. . . Oil pump passive sprocket

16. . . Drive chain

21a, 21b. . . Plane bearing

22a, 22b, 23a, 23b. . . Ball bearing

Claims (5)

An oil pump transmission mechanism is mounted on an engine, comprising: a crankshaft; a balance shaft drive gear, is disposed on the crankshaft; a balance shaft; a balance shaft driven gear, is disposed on the balance shaft and meshes with the balance a shaft drive gear; an auxiliary shaft; an oil pump driven gear set on the auxiliary shaft and meshed with the balance shaft drive gear; an oil pump drive sprocket set on the auxiliary shaft; an oil pump including a machine The oil pump passive sprocket; and a drive chain that is wound around the oil pump drive sprocket with the oil pump passive sprocket. The mechanism of claim 1, wherein the engine comprises a crankcase formed by a combination of a left crankcase half and a right crankcase half, the crankshaft, the balance shaft, the auxiliary shaft and The oil pump is mounted in the crankcase. The mechanism of claim 2, wherein the balance shaft and the auxiliary shaft are respectively carried by the two ball bearings and the right crankcase half and the right crankcase half. The mechanism of claim 3, wherein the oil pump driven gear and the oil pump drive sprocket are disposed on opposite sides of one of the two ball bearings on the auxiliary shaft. The mechanism of claim 2, wherein the crankshaft is respectively carried by the two-plane bearing to the left crankcase half and the right crankcase half.