Valve clearance adjusting device and vehicle with same

Abstract

The utility model discloses a valve clearance adjusting device and a vehicle with the same, and relates to the field of automobile parts. The device comprises a screw assembly, an elephant foot and a valve assembly, the screw assembly comprises a screw, the bottom of the screw is provided with a screw ball head, and the screw ball head is hinged to a concave cavity formed in the elephant foot and can move up and down relative to the concave cavity; the movement stroke of the screw ball head in the concave cavity is larger than or equal to a valve gap reserved between the elephant foot and the valve assembly, a screw inner flow channel is formed in the screw, and a gap adjusting assembly is arranged in the screw inner flow channel. At least one part of the gap adjusting assembly can move under the action of the working medium in the screw inner flow channel, the screw inner flow channel is opened, the working medium pushes the elephant foot to move towards the valve assembly, and the valve gap is made up. The valve clearance can be adjusted, and slapping noise of the elephant foot and the end of the valve is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile parts, especially to a valve clearance adjusting device and a vehicle with the same. BACKGROUND

[0002] In the valve train of an engine, the valve rocker arm is abutted with the camshaft through the rocker arm body to transmit the thrust of the camshaft to the valve, so that the valve can complete the intake and exhaust in the cylinder according to the cam profile. Since the valve will expand due to the temperature rise when the engine is working, if there is no gap or the gap is too small between the valve and its transmission member in the cold state, the valve and its transmission member will inevitably cause the valve to close loosely due to the thermal expansion in the hot state, resulting in air leakage in the compression stroke and the working stroke of the engine, which reduces the power, and in severe cases, the engine is difficult to start. In order to eliminate this phenomenon, a certain gap is usually left between the valve and its transmission mechanism during the cold assembly of the engine to compensate for the expansion of the valve after heating. This gap is called valve clearance. However, the existence of the valve clearance will cause the valve to hit the shoe when the cam is in the lift phase. SUMMARY

[0003] Therefore, the utility model provides a valve clearance adjusting device and a vehicle with the same, which can adjust the valve clearance and reduce the hitting noise between the shoe and the end of the valve.

[0004] The utility model provides a valve clearance adjusting device, which comprises a screw provided with a screw ball head at the bottom, the screw ball head is hinged in a cavity provided in the shoe and can move up and down relative to the cavity, the movement stroke of the screw ball head in the cavity is greater than or equal to the valve clearance reserved between the shoe and the valve assembly, the inside of the screw is provided with a screw inner flow channel, a gap adjusting assembly is arranged in the screw inner flow channel, at least a part of the gap adjusting assembly can move under the action of a working medium in the screw inner flow channel, the screw inner flow channel is opened, and the working medium pushes the shoe to move towards the valve assembly to compensate for the valve clearance.

[0005] Further, the screw inner flow channel comprises an upper flow channel and a lower flow channel which are in communication with each other, the diameter of the lower flow channel is greater than that of the upper flow channel, the gap adjusting assembly is arranged in the lower flow channel and at least a part of the gap adjusting assembly can move up and down relative to the lower flow channel, when the part of the gap adjusting assembly moves downward, the working medium can flow into the space between the bottom of the screw assembly and the shoe through the lower flow channel, and when the part of the gap adjusting assembly moves upward, the gap adjusting assembly abuts against the upper flow channel to close the lower flow channel.

[0006] Further, the gap adjusting assembly comprises a sealing pad, a pressure spring and a fixing ring, one end of the pressure spring is connected with the fixing ring, the other end of the pressure spring is connected with the sealing pad, the sealing pad can abut against the bottom of the upper flow channel under the elastic force of the pressure spring, the upper flow channel is communicated with the rocker arm inner flow channel, and the lower flow channel is communicated with the recess cavity arranged in the elephant foot.

[0007] Further, the upper flow channel comprises a first upper flow channel and a second upper flow channel, the first upper flow channel extends along the transverse direction of the screw assembly, the first upper flow channel is communicated with the rocker arm inner flow channel, the second upper flow channel extends along the longitudinal direction of the screw assembly, the top end of the second upper flow channel is communicated with the first upper flow channel, and the bottom end of the second upper flow channel is communicated with the lower flow channel.

[0008] Further, the screw assembly is installed at one end of a rocker arm assembly, the rocker arm assembly is internally provided with a rocker arm inner flow channel, and the rocker arm inner flow channel is communicated with the screw inner flow channel.

[0009] Further, the rocker arm assembly comprises a rocker arm and a rocker arm shaft, the rocker arm inner flow channel is arranged in the interior of the rocker arm, one end of the rocker arm is provided with a first mounting hole, the rocker arm shaft is installed in the first mounting hole, the other end of the rocker arm is provided with a second mounting hole, and the screw assembly is installed in the second mounting hole.

[0010] Further, the screw assembly further comprises a nut, the screw is inserted into the second mounting hole, the top of the screw extends out of the top end of the second mounting hole and is screwed with the nut.

[0011] Further, the outer periphery of the screw is provided with a protruding portion, the protruding portion protrudes outward along the radial direction of the screw, and the protruding portion is located between the second mounting hole and the screw head.

[0012] Further, the valve assembly comprises a valve and a valve spring, the valve spring is sleeved on the outer periphery of the valve, and the top end of the valve has a gap with the elephant foot.

[0013] The utility model further provides a vehicle which comprises the valve gap adjusting device.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] The valve clearance adjusting device provided by the utility model and the vehicle with the same can make the gap adjusting assembly push the elephant foot to move downward under the action of the working medium pressure when the cam is in the base circle working stage, eliminate the gap between the elephant foot and the valve assembly, and avoid the elephant foot from emitting a clapping noise when pressing the top end of the valve assembly when the cam is in the lift working stage; that is to say, the valve clearance adjusting device provided by the utility model can make the gap between the elephant foot and the valve assembly disappear in each stage of the engine operation, and neither impact noise between the elephant foot and the valve assembly nor problems such as loose valve closing occurs. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic view of the valve clearance adjusting device provided by the utility model Figure 1 .

[0017] Figure 2 A schematic view of the valve clearance adjusting device provided by the utility model Figure 2 .

[0018] Figure 3 A sectional view of the valve clearance adjusting device provided by the utility model.

[0019] Figure 4 A partial structure enlarged view in the Figure 3 .

[0020] Wherein: 10 - rocker arm assembly; 11 - rocker arm; 111 - first mounting hole; 112 - second mounting hole; 20 - screw assembly; 21 - screw; 211 - screw ball head; 212 - protruding part; 22 - nut; 30 - elephant foot; 31 - concave cavity; 40 - valve assembly; 41 - valve; 411 - sealing part; 42 - valve spring; 43 - fixing piece; 44 - base; 50 - rocker arm inner flow channel; 60 - screw inner flow channel; 61 - upper flow channel; 611 - first upper flow channel; 612 - second lower flow channel; 62 - lower flow channel; 70 - gap adjusting assembly; 71 - sealing gasket; 72 - pressure spring; 73 - fixing ring. DETAILED DESCRIPTION

[0021] The specific embodiments of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0022] In the description of the utility model, it is necessary to explain that the direction or position relation indicated in the description is based on the direction or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not indicated or implied that the indicated part or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0023] Please refer to Figure 1 and Figure 2 The utility model provides a valve clearance adjusting device, including cam, rocker arm assembly 10, screw assembly 20, elephant foot 30 and valve assembly 40. Rocker arm assembly 10 has opposite first end and second end, screw assembly 20 is installed in the first end of rocker arm assembly 10, cam is located in the second end of rocker arm assembly 10 (the second end of rocker arm assembly 10 is not shown in the drawing), can push the second end of rocker arm assembly 10 and move up and down, make the first end of rocker arm assembly 10 reverse motion. Elephant foot 30 is installed in the bottom of screw assembly 20, valve assembly 40 is located below elephant foot 30, and clearance is formed between elephant foot 30. Rocker arm assembly 10 is equipped with rocker arm inner flow channel 50, screw assembly 20 is equipped with screw inner flow channel 60, and gap adjusting assembly 70 is equipped in screw inner flow channel 60, in the working process of engine, gap adjusting assembly 70 can be moved under the action of working medium in rocker arm inner flow channel 50 and screw inner flow channel 60, increase the action force of working medium between elephant foot 30 and screw assembly 20, push elephant foot 30 and move down, contact valve assembly 40, eliminate the clearance between valve assembly 40 and elephant foot 30.

[0024] It should be noted that in a common vehicle, there are two different working stages during one rotation of the cam, namely, the cam is in the base circle working stage and the cam is in the lift working stage, when the cam is in the base circle working stage, the cam does not push the second end of the rocker arm assembly 10 to move up and down, and the first end of the rocker arm assembly 10 also does not move reversely, and a gap is formed between the valve assembly 40 and the elephant foot 30, which is set because the valve will expand due to the temperature rise during engine operation, and if there is no gap or the gap is too small between the valve and its transmission member in the cold state, the valve and its transmission member will inevitably cause the valve to close tightly due to thermal expansion in the hot state; when the cam is in the lift working stage, the cam can push the second end of the rocker arm assembly 10 to move upwards, and the first end of the rocker arm assembly 10 will move downwards, and the screw assembly 20 installed on the first end moves downwards to push the elephant foot 30 to move downwards, and the elephant foot 30 presses the valve assembly 40; since there is a gap between the valve assembly 40 and the elephant foot 30 when the cam is in the base circle working stage, when the cam is in the lift working stage, the elephant foot 30 will produce a knocking noise between the top end of the valve assembly 40 at the moment of pressing the valve assembly 40. Therefore, the valve gap adjusting device provided by the utility model can move the gap adjusting assembly 70 under the action of the working medium in the rocker arm inner flow channel 50 and the screw inner flow channel 60 when the cam is in the base circle working stage, increase the acting force of the working medium between the elephant foot 30 and the screw assembly 20, push the elephant foot 30 to move downwards, and always contact with the valve assembly 40, so as to eliminate the gap between the valve assembly 40 and the elephant foot 30, so that when the cam is in the lift working stage, the elephant foot 30 will not produce a knocking noise between the top end of the valve assembly 40 at the moment of pressing the valve assembly 40 due to the disappearance of the valve gap.

[0025] Please refer to Figure 3 , the rocker arm assembly 10 comprises a rocker arm 11 and a pivot shaft, the first mounting hole 111 is arranged on the rocker arm 11, the pivot shaft is installed in the first mounting hole 111, so that the rocker arm 11 can rotate around the pivot shaft, the second mounting hole 112 is arranged on the first end of the rocker arm 11, and the screw assembly 20 is installed in the second mounting hole 112; the rocker arm inner flow channel 50 is arranged on the rocker arm 11, and the rocker arm inner flow channel 50 and the screw inner flow channel 60 in the screw assembly 20 are communicated, and the working medium in the engine can enter the screw inner flow channel 60 from the rocker arm inner flow channel 50.

[0026] It should be noted that the structure of the pivot shaft and the cam is not shown in the figure, and can be referred to the prior art.

[0027] Please refer to Figure 4, screw assembly 20 includes screw 21 and nut 22, screw 21 is inserted in second mounting hole 112, screw inner channel 60 and gap adjusting assembly 70 are arranged in the interior of screw 21. The bottom of screw 21 is provided with screw ball head 211, the position of screw 21 close to screw ball head 211 is provided with protrusion 212, protrusion 212 protrudes outward along the radial direction of screw 21, for limiting the stroke of upward movement of screw 21, the top of screw 21 is screwed with nut 22 after extending out of the top of second mounting hole 112; Nut 22 is arranged to facilitate the adjustment of the position of screw 21, in the prior art, the operator often adjusts the size of the gap between elephant foot 30 and the top end of valve assembly 40 by adjusting the combined position of nut 22 and screw 21, but this kind of adjustment method usually needs to be completed by manual cooperation with operating tools such as screwdriver and torx wrench, which is time-consuming and laborious.

[0028] Further, the recess 31 is arranged in the elephant foot 30, the screw ball head 211 is hinged in the recess 31 and can swing relative to the elephant foot 30, and the recess 31 is communicated with the second oil channel 60. It should be noted that the stroke of the screw ball head 211 in the recess 31 is greater than or equal to the valve clearance reserved by the engine. In addition, a sealing element is arranged between the recess 31 and the screw ball head 211, which can prevent the working medium in the recess 31 from overflowing.

[0029] Please refer to Figure 4 , the screw inner channel 60 includes upper channel 61 and lower channel 62 which are communicated with each other, the diameter of lower channel 62 is greater than that of upper channel 61, and the gap adjusting assembly 70 is arranged in the lower channel 62 and at least a part of it can move up and down relative to the lower channel 62. When the part of the gap adjusting assembly 70 moves downward, the working medium can flow into the bottom of the screw assembly 20 and between the elephant foot 30 through the lower channel 62, and when the part of the gap adjusting assembly 70 moves upward, the gap adjusting assembly 70 abuts against the upper channel 61 to close the lower channel 62.

[0030] Further, the gap adjusting assembly 70 includes sealing pad 71, pressure spring 72 and fixing ring 73, and the sealing pad 71, pressure spring 72 and fixing ring 73 are all installed in the lower channel 62. The fixing ring 73 is installed at the bottom of the lower channel 62, one end of the pressure spring 72 is connected with the fixing ring 73, and the other end is connected with the sealing pad 71, and the sealing pad 71 abuts against the bottom of the upper channel 61 under the elastic force of the pressure spring 72. Under the action of the working medium in the upper channel 61, when the sealing pad 71 moves downward, the working medium in the upper channel 61 can flow into the bottom of the screw assembly 20 and between the elephant foot 30 through the lower channel 62, and when the sealing pad 71 moves upward, the sealing pad 71 abuts against the upper channel 61 to close the lower channel 62.

[0031] Further, the upper flow channel 61 comprises a first upper flow channel 611 extending along the lateral direction of the screw 21 and communicating with the rocker inner flow channel 50, and a second upper flow channel 612 extending along the longitudinal direction of the screw 21, the top end of which communicates with the first upper flow channel 611, and the bottom end of which communicates with a lower flow channel 62 extending along the longitudinal direction of the screw 21 and communicating with the concave cavity 31 in the elephant foot 30. It should be noted that sealing members are arranged in the first upper flow channel 611 at the upper and lower ends of the second mounting hole 112, which can prevent the working medium in the first upper flow channel 611 from overflowing from the gap between the screw 21 and the second mounting hole 112.

[0032] Specifically, the valve assembly 40 comprises a valve 41 and a valve spring 42, the top end of the valve 41 has a gap with the elephant foot 30, the bottom end of the valve 41 is provided with a sealing part 411, the valve spring 42 is sleeved on the outer periphery of the valve 41, the valve 41 is provided with a fixing member 43 and a base 44, the fixing member 43 is fixed on the valve 41, the base 44 is in sliding connection with the valve 41, and the base 44 is fixed on an adjacent component of the valve assembly 40, one end of the valve spring 42 is connected with the fixing member 43, and the other end is connected with the base 44; the valve 41 is installed on the valve port of the piston, when the valve 41 moves downward under the action of an external force, the sealing part 411 is separated from the valve port, the valve port is opened, and the gas in the piston is discharged from the valve port, on the contrary, after the external force disappears, the valve 41 is pushed upward to reset under the elastic force of the valve spring 42, the sealing part 411 blocks the valve port, and the valve port is closed. It should be noted that the structure of the adjacent component and the piston is specifically described in the prior art, which is not shown in the figure.

[0033] The specific working principle of the valve gap adjusting device provided by the utility model is as follows:

[0034] When the cam is in the base circle working stage, the working medium in the rocker inner flow channel 50 flows to the first upper flow channel 611 and the second upper flow channel 612 in turn, the pressure of the working medium in the second upper flow channel 612 is greater than the elastic force of the pressure spring 72, the sealing gasket 71 is pushed downward, and the working medium enters the concave cavity 31 through the lower flow channel 62, along with the continuous increase of the working medium in the concave cavity 31, the elephant foot 30 moves downward under the action of the working medium pressure, and contacts the top end of the valve 41, so that the gap between the elephant foot 30 and the valve assembly 40 disappears; it should be noted that since the pressure of the working medium pressure cannot be greater than the elastic force of the valve spring 42, the valve 41 cannot move downward, and the valve port remains in a closed state;

[0035] When the cam is in the lift working phase, the cam pushes the second end of the rocker arm 11 upward, and the first end of the rocker arm 11 moves downward, in the process, the rocker arm 11 pushes the screw 21 downward through the protrusion 212 on the screw 21, and the screw 21 pushes the elephant foot 30 downward in the process of moving downward, and then continues to move downward to push the valve 41 to move downward, so that the sealing part 411 of the valve 41 is separated from the valve port, and the valve port is opened, in the process, since the cam is in the base circle working phase, the elephant foot 30 is always in contact with the top end of the valve assembly 40 under the action of the working medium, so the gap between the elephant foot 30 and the valve assembly 40 has disappeared, so when the cam is in the lift working phase, the elephant foot 30 does not make a clicking noise when pushing the top end of the valve 41 downward;

[0036] It should be noted that when the cam is in the lift segment, the cam pushes the screw 21 and the screw ball head 211 of the first end of the rocker arm 11 downward, in the process, since the elastic force of the pressure spring 72 is small, the downward pressure of the screw 21 acting on the elephant foot 30 pushes the working medium in the cavity 31 to flow upward, pushes the sealing gasket 71, and the sealing gasket 71 blocks the second upper flow channel 612, and the working medium stops flowing. In addition, in the process of engine operation, since the stroke of the screw ball head 211 in the cavity 31 is greater than or equal to the valve clearance reserved by the engine, the expansion amount of the valve 41 is compensated, so even if the valve 41 expands due to heat, the problem of loose valve closing will not occur.

[0037] From the above description, it can be known that the valve clearance adjusting device provided by the utility model can make the cam be in the base circle working phase, the gap between the elephant foot 30 and the valve assembly 40 can be eliminated by the gap adjusting assembly 70 under the action of the working medium pressure, and the elephant foot 30 can avoid making a clicking noise when pushing the top end of the valve assembly 40 downward when the cam is in the lift working phase. That is to say, the valve clearance adjusting device provided by the utility model can make the gap between the elephant foot 30 and the valve assembly 40 disappear in each phase of engine operation, so that the impact noise between the elephant foot 30 and the valve assembly 40 will not occur, and the problem of loose valve closing will not occur.

[0038] The utility model also provides a vehicle, including the valve clearance adjusting device as described above, and other technical features of the vehicle can be seen from the prior art, and will not be repeated here.

[0039] The above are only the preferred embodiments of the present application, and are not intended to limit the present application in any form, although the present application has been disclosed as above with the preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical scheme of the present application, can make some changes or modifications to the above disclosed technical content for equivalent embodiments of equivalent changes, but as long as it does not depart from the technical scheme of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiments are still within the scope of the technical scheme of the present application.

Claims

1. A valve clearance adjustment device, comprising a screw assembly (20), a foot (30), and a valve assembly (40), characterized in that: The screw assembly (20) includes a screw (21) with a screw ball head (211) at the bottom. The screw ball head (211) is hinged to a cavity (31) provided in the foot (30) and can move up and down relative to the cavity (30). The movement stroke of the screw ball head (211) in the cavity (31) is greater than or equal to the valve clearance reserved between the foot (30) and the valve assembly (40). The screw (21) has an internal flow channel (60) and a clearance adjustment assembly (70) is provided in the internal flow channel (60). At least a part of the clearance adjustment assembly (70) can move under the action of the working medium in the internal flow channel (60) to open the internal flow channel (60) and make the working medium push the foot (30) towards the valve assembly (40) to compensate for the valve clearance.

2. The valve clearance adjustment device according to claim 1, characterized in that: The screw internal flow channel (60) includes an upper flow channel (61) and a lower flow channel (62) that are interconnected. The diameter of the lower flow channel (62) is larger than the diameter of the upper flow channel (61). The gap adjustment component (70) is disposed in the lower flow channel (62) and at least a part of it can move up and down relative to the lower flow channel (62). When the part of the gap adjustment component (70) moves downward, the working medium can flow into the bottom of the screw assembly (20) and the foot (30) through the lower flow channel (62). When the part of the gap adjustment component (70) moves upward, the gap adjustment component (70) abuts against the upper flow channel (61) and closes the lower flow channel (62).

3. The valve clearance adjustment device according to claim 2, characterized in that: The gap adjustment assembly (70) includes a sealing gasket (71), a pressure spring (72), and a fixing ring (73). The fixing ring (73) is fixed to the bottom of the lower flow channel (62). One end of the pressure spring (72) is connected to the fixing ring (73), and the other end is connected to the sealing gasket (71). The sealing gasket (71) can abut against the bottom of the upper flow channel (61) under the elastic force of the pressure spring (72). The upper flow channel (61) is connected to the inner flow channel (50) of the rocker arm. The lower flow channel (62) is connected to the cavity (31) provided in the elephant foot (30).

4. The valve clearance adjustment device according to claim 2, characterized in that: The upper flow channel (61) includes a first upper flow channel (611) and a second upper flow channel (612). The first upper flow channel (611) extends laterally along the screw assembly (20) and communicates with the inner flow channel (50) of the rocker arm. The second upper flow channel (612) extends longitudinally along the screw assembly (20). The top end of the second upper flow channel (612) communicates with the first upper flow channel (611), and the bottom end of the second upper flow channel (612) communicates with the lower flow channel (62).

5. The valve clearance adjustment device according to claim 3, characterized in that: It also includes a rocker arm assembly (10), the screw assembly (20) is installed at one end of the rocker arm assembly (10), the rocker arm assembly (10) is provided with a rocker arm inner flow channel (50), the rocker arm inner flow channel (50) is connected to the screw inner flow channel (60).

6. The valve clearance adjusting device according to claim 5, characterized in that: The rocker arm assembly (10) includes a rocker arm (11) and a pivot shaft. The inner flow channel (50) of the rocker arm is disposed inside the rocker arm (11). One end of the rocker arm (11) is provided with a first mounting hole (111). The pivot shaft is installed in the first mounting hole (111). The other end of the rocker arm (11) is provided with a second mounting hole (112). The screw assembly (20) is installed in the second mounting hole (112).

7. The valve clearance adjusting device according to claim 6, characterized in that: The screw assembly (20) also includes a nut (22), the screw (21) is inserted into the second mounting hole (112), and the top of the screw (21) extends out of the top of the second mounting hole (112) and is screwed to the nut (22).

8. The valve clearance adjusting device according to claim 6, characterized in that: The screw (21) has a protrusion (212) on its outer periphery. The protrusion (212) protrudes outward along the radial direction of the screw (21) and is located between the second mounting hole (112) and the screw ball head (211).

9. The valve clearance adjustment device according to claim 1, characterized in that: The valve assembly (40) includes a valve (41) and a valve spring (42), the valve spring (42) being sleeved on the outer periphery of the valve (41), and there is a gap between the top of the valve (41) and the elephant foot (30).

10. A vehicle, characterized in that: Includes the valve clearance adjustment device as described in any one of claims 1-9.

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