CN212614929U - Device for reducing engine starting torque - Google Patents

Abstract

A device for reducing the starting torque of an engine comprises a box body, a piston mechanism and a starting mechanism, wherein the piston mechanism and the starting mechanism are arranged in the box body; when fluid from a fluid passage in the box body acts on the working end of the driving piston, the driving piston is placed at an operation position, the starting mechanism is placed at a starting state, and the opened valve cannot return to be seated and is kept open. The utility model discloses by the actuating mechanism of the solid chain formula of oil pressure control at drive piston both ends, make the valve keep a small amount to open when the engine is stalled, shut down and start-up, improve the shut down and the startability of engine, and do not interfere the valve motion when the engine is igniteed and is operated.

Description

Device for reducing engine starting torque

Technical Field

The utility model relates to the field of machinary, especially, relate to vehicle engine technique, especially reduce the device of engine starting moment of torsion.

Background

The performance of the engine includes conventional ignition performance and other auxiliary performance such as braking performance of the engine, stop and start performance of the engine, and the like. Although the hardware and software of the engine are greatly improved, for example, the engine adopts new technology such as heating when in cold start, the compression ignition type diesel engine is difficult to start in cold weather. The engine of the large commercial vehicle also has the defects of unstable running, vibration, noise and the like when the vehicle is stopped. Most of the existing auxiliary valve driving mechanisms for improving the performance of the engine are hydraulic mechanisms. After the engine is shut down, the hydraulic mechanism cannot hold the valve of the engine open. Leakage of fluid (e.g. oil) will cause the hydraulic mechanism to fail because the hydraulic mechanism cannot be supplied with oil after the engine is stopped, the lost fluid is not replenished and the hydraulic connection is lost and the engine valve, which is opened by the fluid, will fall closed under the action of the valve spring.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reduce device of engine starting moment of torsion, this kind of reduce device of engine starting moment of torsion shake and the big and difficult technical problem of engine cold start when will solving among the prior art parking to and hydraulic mechanism can't keep the technical problem of opening with the valve of engine after the engine stalls.

The utility model discloses a reduce device of engine starting torque, including the box with settle piston mechanism and the starting mechanism in the box, piston mechanism still is provided with fluid passage, its characterized in that including setting up the drive piston in the drive piston hole of box in the box: the driving piston comprises a non-working end and a working end, when the fluid from the fluid channel acts on the non-working end of the driving piston, the driving piston is arranged at a non-operation position in the driving piston hole, the driving piston is used for placing the starting mechanism in a non-starting state, the starting mechanism is separated from a valve bridge or a valve of the engine, and the valve is in a normal operation state; when fluid from the fluid passage acts on the working end of the drive piston, the drive piston is placed in an operating position within the drive piston bore, and the drive piston places the activation mechanism in an activated state such that the opened valve cannot be seated back and remain open.

Further, the fluid includes engine oil of an engine.

Furthermore, the fluid passage in the box body comprises a lubricating oil passage and a starting oil passage, the lubricating oil passage is communicated with the driving piston hole at one side of the non-working end of the driving piston, and the starting oil passage is communicated with the driving piston hole at one side of the working end of the driving piston.

Further, the non-working end and the working end of the drive piston include two ends that are different sizes.

Furthermore, the diameter of the excircle of the working end of the driving piston is larger than that of the excircle of the non-working end of the driving piston.

Further, the piston mechanism further includes a positioning spring located on a working end side of the drive piston, the positioning spring biasing the drive piston in the drive piston bore to an operating position.

Furthermore, the acting force of the positioning spring is the product of the oil pressure when the engine is started and the pressure receiving area of the non-working end of the driving piston.

The device for reducing the starting torque of the engine further comprises an oil unloading mechanism, the oil unloading mechanism comprises an oil unloading piston and a return spring, the oil unloading piston and the return spring are arranged in an oil unloading piston hole of the box body, an oil supply groove and an oil unloading channel are formed in the oil unloading piston, the oil unloading piston comprises an oil supply position and an oil unloading position, two ends of the oil unloading piston respectively bear the acting force of the return spring and the pressure of engine oil, the return spring enables the oil unloading piston to be arranged at the oil supply position, the engine oil enters the driving piston hole from the non-working end side of the driving piston through the lubricating oil channel and the oil supply groove in the oil unloading piston, and the driving piston is arranged at the non-operation position; the engine oil from the starting oil channel acts on the oil discharging piston from one end without the return spring, the return spring is pressed to place the oil discharging piston at an oil discharging position, the oil discharging channel is communicated with the driving piston hole at one side of the non-working end of the driving piston to discharge oil, and the driving piston moves to an operation position.

Furthermore, the starting mechanism comprises a swinging mechanism, the swinging mechanism comprises a swinging piece arranged on a swinging shaft, the swinging shaft is arranged on the box body, the swinging piece comprises a connecting end and a working end, the connecting end of the swinging piece is connected with the driving piston, the driving piston drives the swinging piece to swing between a non-starting state and a starting state, and the working end of the swinging piece is separated from the valve bridge or the valve in the non-starting state; in the activated state, the working end of the oscillating element acts on the valve bridge or the valve.

Further, the box body comprises a rocker arm of the engine.

Compared with the prior art, the utility model has positive and obvious effect. The utility model discloses by the oil pressure control actuating mechanism at drive piston both ends, make the valve keep a small amount to open when the engine is flame-out, shut down and start-up, improve the shut down and the startability of engine, and do not interfere the valve motion when the engine is igniteed and is operated. Because the utility model discloses a starting mechanism is the bearing mechanism of solid chain formula, even engine oil pressure is zero state after the engine shuts down, still can guarantee unchangeably at the start-up state, keeps opening the valve of engine to moment of torsion when reducing the engine start.

Drawings

Fig. 1 is a general schematic diagram of a first embodiment of an engine starting torque reduction apparatus of the present invention in a non-starting state.

Fig. 2 is a general schematic diagram of a first embodiment of an engine starting torque reduction apparatus of the present invention in a starting state.

Fig. 3 is a partially enlarged schematic view of a second embodiment of the device for reducing engine starting torque according to the present invention.

Fig. 4 is a top sectional view of an oil discharge mechanism in an oil supply position according to a third embodiment of the device for reducing engine starting torque.

Fig. 5 is a top sectional view of an oil discharge mechanism in an oil discharge position according to a third embodiment of the apparatus for reducing engine starting torque according to the present invention.

Detailed Description

Example 1:

as shown in fig. 1 and 2, the apparatus 100 for reducing the starting torque of the engine of the present embodiment includes a case (here, a rocker arm of the engine) 210, and a piston mechanism 20 and a starting mechanism 10 disposed in the rocker arm 210. The drive piston 22 of the piston mechanism 20 is disposed within the drive piston bore 190 of the rocker arm 210, and the drive piston 22 has a non-working end (left end) 21 and a working end (right end) 29. The piston mechanism 20 further includes a positioning spring 28, the positioning spring 28 being located on the working end 29 side of the drive piston 22, the positioning spring 28 biasing the drive piston 22 in an operative position (fig. 2) within the drive piston bore 190, corresponding to the activated state of the activation mechanism 10. The other (right) end of the positioning spring 28 has a sealing plug 164, and the plug 164 makes the drive piston bore 190 a closed bore (fig. 1 and 2).

The starting mechanism 10 is located above a valve bridge 400 of the engine (and may also be located above a valve 301 of the engine, such as without a valve bridge or other special circumstances). The actuator 10 is here a swing mechanism, which is a non-hydraulic fixed chain type carrier. The swing mechanism 10 includes a swing member 12 mounted on a swing shaft 14, the swing shaft 14 being mounted on a swing arm 210. The oscillating mechanism 10 has a connecting end and a working end. The end face 11 of the working end may be designed as a cylindrical surface, acting in conjunction with the valve bridge 400 or the air gate 301 (fig. 2); the ball stud 16 of the connecting end is connected to a ring groove 23 on a drive piston 22, which drive piston 22 drives the oscillating piece 12 in an oscillating manner between a non-activated state (fig. 1) and an activated state (fig. 2).

The rocker arm 210 also has fluid passages 113 and 213 disposed therein for delivering fluid (including engine oil, also called lubricating oil) to the actuator piston bore 190 at each end (the working end 29 and the non-working end 21) of the actuator piston 22. Therefore, the fluid passages 113 and 213 are also referred to as a start oil passage and a lubrication oil passage, respectively. During engine operation, oil from the engine is always flowing through the oil passage 213 to the drive piston bore 190 on the non-working end 21 side of the drive piston 22, causing the drive piston 22 to move to the non-operating position (right) and placing the starting mechanism 10 in a non-starting state (fig. 1). When the engine is shut down (before shutdown), a two-position three-way solenoid valve (not shown) may be opened to supply oil from the start oil passage 113 to the drive piston bore 190 on the working end 29 side of the drive piston 22, so that the drive piston 22 moves to the operating position (left) to place the starting mechanism 10 in the start state (fig. 2). After the engine is shut down, the two-position three-way solenoid valve is closed and the oil pressure in the fluid passages 113 and 213 is zero, the driving piston 22 is still in the operating position due to the biasing action of the positioning spring 28, the starting mechanism 10 is in the starting state, and the solid-carrying rocker 12 acts on the valve bridge 400 and the valve 301 to keep the valve 301 slightly open. The force required by the detent spring 28 is small, presumably the product of the oil pressure at engine start and the pressure receiving area of the non-working end 21 of the drive piston 22.

The rocker arm 210 is a component of the engine valve train (or drive train) having the lash adjustment system 50 thereon, including the anti-fly off spring 198. The engine valve system 300 below the valve bridge 400 includes two valves 301 and 302 biased against a valve seat 320 of the engine block 500 by valve springs 310 and 312, preventing gas flow between the engine cylinder and the exhaust pipe 600. The rocker arm 210 is driven by a cam (not shown) of the engine, and acts on the valve bridge 400 and the valves 301 and 302 via the lash adjustment system 50 to cyclically open and close them.

The method for reducing the engine starting torque of the present embodiment includes a process of ejecting a valve 301 of an engine using an engine starting torque reducing apparatus (starting apparatus) 100, and includes the steps of:

1. at the time of engine shutdown (before engine stop), fluid (engine oil) is supplied to the driving piston bore 190 on the working end 29 side (right side) of the driving piston 22 through the fluid passage (starting oil passage) 113 in the case (rocker arm) 210,

2. the piston 22 is driven to the operative position (to the left) to urge the actuating mechanism (swing mechanism) 10 to the actuated state (transition from fig. 1 to fig. 2, swing portion 12 from inclined to vertical),

3. the valve-driving mechanism of the engine, including the cam (not shown) and rocker arm 210 of the engine, the dual valve engine further including a valve bridge 400, opens the valves 301 and 302 of the engine,

4. the actuator 10 reaches its actuated state (pendulums vertical) and acts on the return valve bridge 400 or valve 301 to hold the opened valve 301 open without returning to seat, the opening being 330 (figure 2),

5. the engine is stopped, the starting mechanism 10 is still in the starting position (pendulums vertical), the valve 301 is kept open (figure 2),

6. the engine starts, the starting mechanism 10 keeps the valve 301 open to reduce the torque for engine starting,

7. fluid (engine oil) enters the drive piston hole 190 on the non-working end 21 side (left side) of the drive piston 22 through a fluid passage (lubricating oil passage) 213 in the case (rocker arm) 210, the drive piston 22 moves to the non-operating position (right), the actuator (rocking mechanism) 10 is pushed to the non-actuated state (rocking member inclination), is separated from the valve bridge 400 or the valve 301, the valve 301 is reseated and closed (transition from fig. 2 to fig. 1), and

8. the engine is fired and fluid (oil) pressure acting on the non-working end 21 holds the drive piston 22 in the non-operating position and the actuator 10 is held in the non-actuated state (pendulums inclined) separated from the valve bridge 400 or valves 301 (fig. 1).

Example 2:

as shown in fig. 3, the driving piston 22 of the piston mechanism 20 of the starting apparatus 100 of the present embodiment includes two ends having different sizes, and the pressure receiving area (the cross-sectional area of the cylindrical surface 27) of the working end 29 is larger than the pressure receiving area (the cross-sectional area of the cylindrical surface 26) of the non-working end 21. When both ends receive the same fluid (oil) pressure, the driving piston 22 of this embodiment, which has different sizes at both ends, generates different forces at both ends, so that it loses oil pressure balance and deflects to one direction. Here it is shown that the drive piston 22 moves to the operating position (to the left) when both ends are simultaneously subjected to the same oil pressure, and the actuator 10 swings from the inclined non-actuated position (fig. 1) to the vertical actuated position (fig. 2) because the working end 29 is larger than the non-working end 21.

It is apparent that the drive piston bore 190 in the housing (rocker arm) 210 must be modified to be a stepped piston bore of different cylindrical dimensions to match the drive piston 22 having two end faces of different dimensions. The working principle and method of this embodiment are the same as the previous embodiment.

Example 3:

as shown in fig. 4 and 5, the apparatus 100 for reducing engine starting torque of the present embodiment further includes an oil discharging mechanism 30, the oil discharging mechanism 30 includes an oil discharging piston 352 and a return spring 358 disposed in an oil discharging piston hole 360 of the housing (rocker arm) 210, one end (lower end, on the side of the return spring 358) of the oil discharging piston hole 360 is communicated with the outside (not closed), the oil discharging piston 352 is provided with an oil supply groove 356 and an oil discharging passage 354 (including a ring groove, a radial hole, and an axial hole), and the oil discharging piston 352 moves between an oil supply position (up) and an oil discharge position (down) in the oil discharging piston hole 360.

When the engine is shut down (before shutdown), a two-position three-way solenoid valve (not shown) may be opened to supply oil from the start oil passage 113 to both the oil drain piston bore 360 and the drive piston bore 190 on the working end 29 side of the drive piston 22, thereby moving the drive piston 22 to the operating position (left) (fig. 2 and 5) and placing the starting mechanism 10 in the starting state (fig. 2). After the engine is stopped, the two-position three-way solenoid valve is closed and oil is discharged, the oil pressure in the starting oil passage 113 and the lubricating oil passage 213 is zero, the driving piston 22 is still at the operating position due to the biasing action of the positioning spring 28, the starting mechanism 10 is in the starting state, and the valve 301 is kept to be opened by a small amount by the solid-loaded swing rod 12.

After the oil unloading mechanism 30 is added, similar to the first embodiment, the method for reducing the engine starting torque of the present embodiment can be divided into the following steps:

1. when the engine is turned off (before the engine is stopped), fluid (engine oil) is simultaneously supplied to the oil drain piston hole 360 and the driving piston hole 190 on the working end 29 side (right side) of the driving piston 22 through the fluid passage (starting oil passage) 113 in the case (rocker arm) 210,

2. the fluid (oil) pressure overcomes the force of the return spring 358 to urge the oil drain piston 352 from the oil supply position (fig. 4) to the oil drain position (fig. 5), communicating the oil drain passage 354 of the oil drain piston 352 to drain fluid (oil) from the drive piston bore 190 on the non-working end 21 side (left side) of the drive piston 22,

3. the driving piston 22 is moved towards the operating position (figures 2 and 5), pushing the actuating mechanism (oscillating mechanism) 10 towards the actuated condition (figure 2),

4. the valve-driving mechanism of the engine opens the valves 301 and 302 of the engine,

5. the actuator 10 reaches its actuated state (fig. 2), acting on the return valve bridge 400 or valve 301, so that the opened valve 301 cannot be seated back and remains open,

6. the engine is stopped, the starting mechanism 10 is still in the starting state, the valve 301 is kept open (fig. 2),

7. the oil dump piston 352 returns from the oil dump position (figure 5) to the oil supply position (figure 4) under the influence of a return spring 358,

8. the engine starts, the starting mechanism 10 holds the valve 301 open (fig. 2) to reduce the torque at engine start,

9. fluid (oil) is supplied to the driving piston bore 190 on the non-working end 21 side of the driving piston 22 through the fluid passage (oil passage) 213 in the housing (rocker arm) 210 and the oil supply groove 356 in the oil drain piston 352, the driving piston 22 moves to the non-operating position (fig. 1 and 5), the actuating mechanism 10 is pushed to the non-actuating state, is separated from the valve bridge 400 or the valve 301, the valve 301 is reseated and closed (fig. 1), and

10. the engine is fired and fluid (oil) pressure acting on the non-working end 21 holds the drive piston 22 in the non-operating position and the actuator mechanism is held in the non-actuated state, disengaged from the valve bridge or valves (fig. 1).

The above description contains specific embodiments which should not be construed as limiting the scope of the invention but rather as representing some specific exemplifications of the invention from which many other evolutions may be possible. For example, the engine cranking torque reduction apparatus shown herein may be used not only in a pushrod engine but also in an overhead cam engine; the valve can be used for driving an exhaust valve and an intake valve; the valve opening amount may be different not only for one valve but also for two or more valves.

Further, the number of cylinders whose engine valves are held open by the starting mechanism may be selected as desired. Sometimes, it is not necessary to keep all cylinders open, but only to keep the engine valves of some cylinders open by the starting mechanism, and the engine valves of the rest cylinders keep the original starting state and are not influenced by the starting mechanism.

Also, the control of the pistons (including the drive piston and the oil discharge piston) shown herein to switch between different positions may be varied and is not limited to engine oil or to two-position three-way solenoid valves of the engine; the orientation and mounting of the pistons integrated in the rocker arms may also vary. Both the associated spring force and fluid (oil) pressure may be adjusted as desired.

Accordingly, the scope of the present invention should be determined not by the specific exemplifications set out above, but by the appended claims and their legal equivalents.

Claims (10)

1. The utility model provides a reduce device of engine starting torque, includes the box and settles piston mechanism and the starting drive in the box, and piston mechanism still is provided with fluid passage, its characterized in that including setting up the drive piston in the drive piston hole of box, in the box: the driving piston comprises a non-working end and a working end, when the fluid from the fluid channel acts on the non-working end of the driving piston, the driving piston is arranged at a non-operation position in the driving piston hole, the driving piston is used for placing the starting mechanism in a non-starting state, the starting mechanism is separated from a valve bridge or a valve of the engine, and the valve is in a normal operation state; when fluid from the fluid passage acts on the working end of the drive piston, the drive piston is placed in an operating position within the drive piston bore, and the drive piston places the activation mechanism in an activated state such that the opened valve cannot be seated back and remain open.

2. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the fluid comprises engine oil of an engine.

3. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the fluid passage in the box body comprises a lubricating oil passage and a starting oil passage, the lubricating oil passage is communicated with a driving piston hole at one side of the non-working end of the driving piston, and the starting oil passage is communicated with a driving piston hole at one side of the working end of the driving piston.

4. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the non-working end and the working end of the drive piston include two ends of different sizes.

5. The apparatus for reducing engine starting torque as set forth in claim 4, wherein: the excircle diameter of the working end of the driving piston is larger than that of the non-working end of the driving piston.

6. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the piston mechanism further includes a positioning spring positioned on a side of the working end of the drive piston, the positioning spring biasing the drive piston in the drive piston bore to an operating position.

7. The apparatus for reducing engine starting torque as set forth in claim 6, wherein: the acting force of the positioning spring is the product of the engine oil pressure and the pressure receiving area of the non-working end of the driving piston when the engine is started.

8. The apparatus for reducing engine starting torque as set forth in claim 1 or 3, wherein: the oil discharging mechanism comprises an oil discharging piston and a return spring, the oil discharging piston is arranged in an oil discharging piston hole of the box body, an oil supply groove and an oil discharging channel are formed in the oil discharging piston, the oil discharging piston comprises an oil supply position and an oil discharging position, two ends of the oil discharging piston respectively bear acting force of the return spring and pressure of engine oil, the oil discharging piston is arranged at the oil supply position through the return spring, the engine oil enters the driving piston hole from one side of the non-working end of the driving piston through the lubricating oil channel and the oil supply groove in the oil discharging piston, and the driving piston is arranged at the non-operation position; the engine oil from the starting oil channel acts on the oil discharging piston from one end without the return spring, the return spring is pressed to place the oil discharging piston at an oil discharging position, the oil discharging channel is communicated with the driving piston hole at one side of the non-working end of the driving piston to discharge oil, and the driving piston moves to an operation position.

9. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the starting mechanism comprises a swinging mechanism, the swinging mechanism comprises a swinging piece arranged on a swinging shaft, the swinging shaft is arranged on the box body, the swinging piece comprises a connecting end and a working end, the connecting end of the swinging piece is connected with a driving piston, the driving piston drives the swinging piece to swing between a non-starting state and a starting state, and the working end of the swinging piece is separated from a valve bridge or an air valve in the non-starting state; in the activated state, the working end of the oscillating element acts on the valve bridge or the valve.

10. The apparatus for reducing engine starting torque as set forth in claim 1, wherein: the box body comprises a rocker arm of the engine.

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