CN116197650A - Meshing gap adjusting tool and adjusting method - Google Patents

Abstract

The disclosure provides a meshing clearance adjustment tool and an adjustment method, and relates to the technical field of engine assembly. The meshing gap adjusting tool comprises a positioning assembly and an adjusting assembly; the positioning assembly comprises a positioning part and a supporting part, the supporting part is connected with the positioning part, the positioning part is detachably connected with the engine cylinder body, and the supporting part is used for supporting the adjusting assembly at a position close to the balance shaft assembly; the adjusting component comprises an adjusting bolt, and the tail end of the adjusting bolt is abutted with the balance shaft assembly; the meshing clearance adjustment tool is configured such that the adjusting bolt rotates in a certain direction, the tail end of the adjusting bolt stretches and contracts in the axial direction, and the balance shaft assembly moves along with the tail end of the adjusting bolt so as to adjust the meshing clearance between the driven gear and the driving gear. The meshing clearance adjustment tool can realize adjustment of the meshing clearance between the driven gear of the lower hanging type balance shaft assembly and the driving gear of the crankshaft assembly, and has the advantages of simple structure, convenience in operation, wide application range and the like.

Description

Meshing gap adjusting tool and adjusting method

Technical Field

The disclosure relates to the technical field of engine assembly, in particular to a meshing clearance adjustment tool and an adjustment method.

Background

When the engine works, the piston reciprocates in the cylinder, and the large inertia force of the piston can lead the low-frequency vibration of the engine to be outstanding, so that most high-end four-cylinder engines can be matched with the balance shaft, the integral vibration of the engine is reduced, and the driving comfort is improved.

The underhung balance shaft assembly adopts gear driving, and a meshing gap exists between a driven gear and a crankshaft driving gear, so that large abnormal noise is easily generated when the meshing gap is too large or too small, and particularly, when the rotating speed is low, the abnormal noise is easily protruded, and complaints of users are caused.

Disclosure of Invention

The utility model provides a meshing clearance adjustment tool and an adjustment method, which can solve the problem that the meshing clearance between a driven gear and a crankshaft driving gear of a lower hanging type balance shaft assembly is too large or too small.

The technical scheme is as follows:

on the one hand, the meshing clearance adjustment tool is suitable for adjusting the meshing clearance between the driven gear of the lower hanging type balance shaft assembly and the driving gear of the crankshaft assembly;

the meshing gap adjusting tool comprises a positioning assembly and an adjusting assembly;

the positioning assembly comprises a positioning part and a supporting part, the supporting part is connected with the positioning part, the positioning part is detachably connected with the engine cylinder body, and the supporting part is used for supporting the adjusting assembly at a position close to the balance shaft assembly;

the adjusting component comprises an adjusting bolt, and the tail end of the adjusting bolt is abutted with the balance shaft assembly;

the meshing clearance adjustment tool is configured such that the adjusting bolt rotates in a certain direction, the tail end of the adjusting bolt stretches and contracts in the axial direction, and the balance shaft assembly moves along with the tail end of the adjusting bolt to adjust the meshing clearance between the driven gear and the driving gear.

In some embodiments, the balance shaft assembly comprises a mounting bolt, and the engine block is provided with a kidney-shaped mounting hole;

the assembly bolts are matched with the kidney-shaped assembly holes;

the axis direction of the adjusting bolt is parallel to the extending direction of the kidney-shaped assembly hole, and the balance shaft assembly moves along the kidney-shaped assembly hole so as to adjust the meshing clearance of the driven gear and the driving gear.

In some embodiments, the relationship between the rotation angle θ of the adjusting bolt and the movement distance X of the balance shaft assembly satisfies:

X＝P×θ/360°；

wherein P is the pitch of the adjusting bolt.

In some embodiments, the adjustment assembly further comprises a dial, the adjustment bolt being rotatably connected to the dial, the dial being used to indicate the angle at which the adjustment bolt is rotated.

In some embodiments, the positioning portion comprises a positioning bolt; the engine cylinder body is provided with a positioning hole;

the positioning bolt is matched with the positioning hole.

On the other hand, an adjustment method of the meshing gap is provided, and the meshing gap adjustment tool disclosed by the disclosure is adopted; the adjusting method comprises the following steps:

connecting the balance shaft assembly with the engine block such that the driven gear is pre-meshed with the drive gear;

connecting the meshing clearance adjustment tool with the engine cylinder body so that the positioning part is connected with the engine cylinder body, and supporting the adjusting component at a position close to the balance shaft assembly by the supporting part;

adjusting the adjusting bolt to an initial state that the tail end of the adjusting bolt abuts against the balance shaft assembly;

and rotating the adjusting bolt to enable the balance shaft assembly to move along with the tail end of the adjusting bolt so as to adjust the meshing clearance of the driven gear and the driving gear.

In some embodiments, the rotating the adjustment bolt such that the balance shaft assembly moves with the end of the adjustment bolt to adjust the meshing gap of the driven gear and the drive gear includes:

determining an initial engagement gap when the driven gear is pre-engaged with the drive gear;

determining a distance X to be moved of the balance shaft assembly according to a difference value between a target meshing gap of the driven gear and the driving gear and the initial meshing gap;

and rotating the adjusting bolt to enable the balance shaft assembly to move by a distance X.

In some embodiments, the rotating the adjusting bolt such that the balance shaft assembly moves a distance X comprises:

rotating the adjusting bolt to push the balance shaft assembly to move by a moving distance X;

or,

and rotating the adjusting bolt to enable the tail end of the adjusting bolt to move by a distance X, and moving the balance shaft assembly in the same direction until the balance shaft assembly is abutted with the tail end of the adjusting bolt again.

In some embodiments, the rotating the adjusting bolt such that the balance shaft assembly moves a distance X comprises:

determining the rotation parameters of the adjusting bolts according to the distance X required to be moved by the balance shaft; the rotation parameters include a rotation direction and a rotation angle.

In some embodiments, the determining the rotation parameter of the adjusting bolt according to the distance X that the balance shaft needs to move includes:

when the distance X of the balance shaft to be moved is a positive value, the rotation direction of the adjusting bolt is clockwise;

when the distance X that the balance shaft needs to move is a negative value, the rotation direction of the adjusting bolt is a counterclockwise direction;

the rotation angle θ=360° X/P of the adjusting bolt, where P is the pitch of the adjusting bolt.

The beneficial effects that this disclosure provided technical scheme brought include at least:

the meshing clearance adjustment tool can realize adjustment of the meshing clearance between the driven gear of the lower hanging type balance shaft assembly and the driving gear of the crankshaft assembly, has the advantages of simple structure, convenience in operation, wide application range and the like, adjusts the meshing clearance between the driven gear of the lower hanging type balance shaft assembly and the driving gear of the crankshaft assembly to an optimal range, improves the transmission efficiency of the crankshaft assembly and the balance shaft assembly, reduces abnormal noise generated by an engine, and improves the working efficiency of the engine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural view of a meshing gap adjustment tool provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an assembled state of a balance shaft assembly, a crankshaft assembly, an engine block provided by an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an assembled state of a balance shaft assembly and an engine block provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural view of a meshing gap adjustment tool according to another embodiment of the present disclosure;

fig. 5 is a flowchart illustrating a method for adjusting a meshing gap according to an embodiment of the present disclosure.

Reference numerals in the drawings are respectively expressed as:

100. a balance shaft assembly; 200. a crankshaft assembly; 300. an engine block;

1. a positioning assembly; 11. a positioning part; 12. a support part;

2. an adjustment assembly; 21. an adjusting bolt; 22. a dial; 23. rotating the handle;

3. assembling a bolt;

4. waist-shaped assembly holes;

5. and positioning holes.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1 are merely for convenience in describing the present disclosure and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present disclosure.

Unless defined otherwise, all technical terms used in the embodiments of the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art.

In the related art, the meshing gap between the driven gear of the balance shaft assembly and the driving gear of the crankshaft assembly is ensured by dimensional tolerance. However, the number of parts is large, and due to the production and assembly errors, the meshing gap is easy to be larger or smaller, so that serious ring gear knocking noise or squeaking problems can be caused.

To solve the problem of abnormal knocking noise or abnormal squeal, it is necessary to verify the performance of the balance shaft in terms of NVH (Noise Vibration Harshness, noise, vibration and harshness) at different meshing clearances to find the optimal meshing clearance of the balance shaft assembly and the crankshaft assembly. However, the adjustment of the meshing gap between the balance shaft assembly and the crankshaft assembly is not well controlled, and a precise backlash adjustment instrument is used for adjustment in the related technology, but the instrument has a complex structure, is relatively complex in instrument cost and operation procedure, and limits the use scene of the instrument.

Therefore, the meshing clearance adjustment tool can realize adjustment of the meshing clearance between the driven gear of the lower hanging type balance shaft assembly and the driving gear of the crankshaft assembly, and has the advantages of being simple in structure, convenient to operate, wide in application range and the like.

For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a meshing gap adjustment tool provided in an embodiment of the present disclosure; fig. 2 is a schematic diagram showing an assembled state of the balance shaft assembly 100, the crankshaft assembly 200, and the engine block 300 according to the embodiment of the present disclosure.

In one aspect, referring to fig. 1 and 2, the present embodiment provides a meshing gap adjustment tool, which is suitable for adjusting a meshing gap between a driven gear of a lower hanging type balance shaft assembly 100 and a driving gear of a crankshaft assembly 200.

Wherein optionally the underhung balance shaft assembly 100 includes a housing member, at least one balance shaft, and a driven gear. The balance shaft rotates by itself, so that the engine works more stably and smoothly.

Illustratively, the lower hanging type balance shaft assembly 100 is internally provided with double balance shafts, and a chain transmission mode is adopted to drive the two balance shafts to rotate, wherein one balance shaft has the same rotation speed as the engine, so that the first-order vibration of the engine can be eliminated; the rotating speed of the other balance shaft is 2 times of the rotating speed of the engine, and the second-order vibration of the engine can be eliminated, so that a more ideal vibration reduction effect is achieved.

The meshing gap adjusting tool comprises a positioning assembly 1 and an adjusting assembly 2.

The positioning assembly 1 includes a positioning portion 11 and a supporting portion 12, the supporting portion 12 is connected with the positioning portion 11, the positioning portion 11 is detachably connected with the engine block 300, and the supporting portion 12 is used for supporting the adjusting assembly 2 at a position close to the balance shaft assembly 100.

The adjusting component 2 comprises an adjusting bolt 21, and the tail end of the adjusting bolt 21 is abutted with the balance shaft assembly 100.

The meshing gap adjustment tool is configured such that the adjusting bolt 21 is rotated in a certain direction, the tip of the adjusting bolt 21 is axially contracted, and the balance shaft assembly 100 is moved along with the tip of the adjusting bolt 21 to adjust the meshing gap between the driven gear and the driving gear.

The meshing clearance adjustment tool of the embodiment can realize adjustment of the meshing clearance between the driven gear of the lower hanging type balance shaft assembly 100 and the driving gear of the crankshaft assembly 200, and has the advantages of simple structure, convenience in operation, wide application range and the like.

By applying the meshing gap adjustment tool of the embodiment, the meshing gap between the driven gear of the lower hanging type balance shaft assembly 100 and the driving gear of the crankshaft assembly 200 can be adjusted to an optimal range, the transmission efficiency of the crankshaft assembly 200 and the balance shaft assembly 100 is improved, abnormal noise generated by an engine is reduced, and the working efficiency of the engine is improved.

In some possible implementations, the adjustment bolt 21 is threadedly coupled to the support portion 12 such that rotating the adjustment bolt 21 may cause the adjustment bolt 21 to move axially.

Fig. 3 is a schematic diagram illustrating an assembled state of the balance shaft assembly 100 and the engine block 300 according to the embodiment of the present disclosure.

As shown in connection with fig. 1 and 3, in some embodiments, the balance shaft assembly 100 includes a mounting bolt 3, and the engine block 300 is provided with a kidney-shaped mounting hole 4; the assembly bolts 3 are matched with the kidney-shaped assembly holes 4.

The axial direction of the adjusting bolt 21 is parallel to the extending direction of the kidney-shaped fitting hole 4, and the balance shaft assembly 100 moves along the kidney-shaped fitting hole 4 to adjust the meshing gap of the driven gear and the driving gear.

The waist-shaped assembly hole 4 is named because of the shape, two ends of the waist-shaped assembly hole 4 are semicircular arcs, and the middle is a parallel plane.

When the machine is assembled, the mutual positions of some parts are difficult to achieve ideal positions or the positions among the parts need to be adjusted, generally, waist-shaped holes are designed, positioning and fastening of the waist-shaped holes are simple, and only a flat gasket with strength meeting the requirement is added.

The balance shaft assembly 100 and the engine cylinder 300 of the embodiment are matched by adopting the assembly bolts 3 and the kidney-shaped assembly holes 4, which is beneficial to the position adjustment of the balance shaft assembly 100, and further realizes the adjustment of the meshing clearance of the driven gear and the driving gear.

The direction of the position adjustment of the balance shaft assembly 100 and the engine block 300 may be referred to the direction indicated by arrow a in fig. 3.

In some embodiments, the pre-tightening torque of the mounting bolts 3 is less than 3Nm, so that the balance shaft assembly 100 and the engine block 300 can freely slide in a fitting manner.

In some embodiments, the relationship between the rotation angle θ of the adjustment bolt 21 and the movement distance X of the balance shaft assembly 100 satisfies:

X＝P×θ/360°；

where P is the pitch of the adjusting bolt 21.

By the above formula, the proportional relationship between the moving distance X of the balance shaft assembly 100 and the rotation angle θ of the adjustment bolt 21 can be determined, so that by precisely controlling the rotation angle θ of the adjustment bolt 21, precise control of the moving distance of the balance shaft assembly 100 can be achieved.

Fig. 4 is a schematic structural diagram of an engagement gap adjustment tool according to another embodiment of the present disclosure.

As shown in connection with fig. 4, in some embodiments, the adjustment assembly 2 further includes a dial 22, the adjustment bolt 21 being rotatably coupled to the dial 22, the dial 22 being adapted to indicate the angle at which the adjustment bolt 21 is rotated.

With the dial 22 of the present embodiment, the rotation angle θ of the adjusting bolt 21 can be accurately identified, thereby more conveniently identifying and controlling the moving distance of the balance shaft assembly 100.

In some possible implementations, referring to fig. 4, the adjusting bolt 21 has a rotary handle 23, and the rotary handle 23 corresponds to the dial 22 in position, and can serve as a force application structure for rotating the adjusting bolt 21 and also serve to indicate a rotation angle.

As shown in connection with fig. 3, in some embodiments, the positioning portion 11 includes a positioning bolt; the engine block 300 is provided with a positioning hole 5; the positioning bolts are matched with the positioning holes 5.

The meshing gap adjustment tool of the present embodiment uses a positioning bolt as the positioning portion 11, the positioning bolt being fitted with the positioning hole 5 on the engine block 300, thereby achieving the effect of fixing the meshing gap adjustment tool on the engine block 300.

The positioning portion 11 may have another structure, and may be fixed and positioned by another inherent structure on the engine block 300. For example, the positioning portion 11 has a pincer-like structure, and is positioned and fixed by the side wall of the engine block 300.

On the other hand, the embodiment provides a method for adjusting the meshing gap, and the meshing gap adjusting tool disclosed by the invention is adopted.

The meshing gap adjusting method of the embodiment adopts the meshing gap adjusting tool disclosed by the disclosure, and has all the beneficial technical effects of all the embodiments.

Fig. 5 is a flowchart illustrating a method for adjusting a meshing gap according to an embodiment of the present disclosure.

Referring to fig. 5, the adjustment method of the present embodiment includes:

s1, connecting the balance shaft assembly 100 with the engine cylinder 300 so that the driven gear and the driving gear are pre-meshed.

S2, connecting the meshing clearance adjustment tool with the engine cylinder body 300, enabling the positioning part 11 to be connected with the engine cylinder body 300, and supporting the adjusting component 2 at a position close to the balance shaft assembly 100 by the supporting part 12.

And S3, adjusting the adjusting bolt 21 to an initial state that the tail end of the adjusting bolt 21 abuts against the balance shaft assembly 100.

And S4, rotating the adjusting bolt 21, so that the balance shaft assembly 100 moves along with the tail end of the adjusting bolt 21 to adjust the meshing clearance of the driven gear and the driving gear.

The meshing gap adjusting method can be used for adjusting the meshing gap, is simple to operate, has less restriction on use occasions, is beneficial to improving the transmission efficiency of the crankshaft assembly 200 and the balance shaft assembly 100, reduces abnormal noise generated by an engine, and improves the working efficiency of the engine.

In some possible implementations, step S1, connecting the balance shaft assembly 100 with the engine block 300 such that the driven gear is pre-engaged with the driving gear includes:

s11, preparing a balance shaft assembly 100, a crankshaft assembly 200 and the meshing gap adjusting tool for adjusting the meshing gap; wherein the crankshaft assembly 200 is implemented to fit within an engine block 300. It will be appreciated that when the balance shaft assembly 100 is precisely positioned with respect to the engine block 300, precise positioning is also accomplished between the balance shaft assembly 100 and the crankshaft assembly 200, with the meshing gap between the driven gear of the former and the drive gear of the latter being optimized.

S12, the engine cylinder body 300 is on the support tool in an independent mode and is rotated 180 degrees along the axis, so that the bottom of the engine cylinder body 300 faces upwards, namely the assembling surface of the engine cylinder body 300 and the balance shaft assembly 100 turns upwards.

Illustratively, the bracket fixture is used for fixing the engine block 300, so that the engine cannot be easily moved or rotated, and the balance shaft clearance is convenient to adjust.

The balance shaft assembly 100 of the present disclosure is a down-hang type, which is normally hung at the bottom of the engine block 300.

S13, checking the state of the balance shaft assembly 100 to ensure no abnormal condition (the method can be generally used on an engine to be verified, and can judge whether the balance shaft assembly 100 is normal or not according to noise and vibration performance of the engine during operation, or can check whether the gear rings are worn, broken and other conditions after the balance shaft assembly 100 is disassembled).

S14, the crankshaft assembly 200 is rotated to a zero-phase position (for example, a position of 90 degrees of the top dead center of the first cylinder), and the crankshaft assembly 200 is fixed at an initial phase position by using a crankshaft timing pin.

S15, the balance shaft assembly 100 is solitary at the initial phase by utilizing the balance shaft timing pin.

S16, placing the balance shaft assembly 100 on the engine cylinder body 300, installing the assembly bolts 3 into the kidney-shaped assembly holes, and applying a pretightening moment smaller than 3Nm, so that the basic connection requirement is met, and the balance shaft assembly and the engine cylinder body 300 can move mutually.

In some embodiments, step S4, rotating the adjusting bolt 21 such that the balance shaft assembly 100 moves with the end of the adjusting bolt 21 to adjust the meshing gap of the driven gear and the driving gear, includes:

s41, determining an initial meshing gap when the driven gear and the driving gear are pre-meshed.

S42, determining the distance X that the balance shaft assembly 100 needs to move according to the difference value between the target meshing clearance and the initial meshing clearance of the driven gear and the driving gear.

S43, rotating the adjusting bolt 21 so that the balance shaft assembly 100 moves by a distance X.

In the adjustment method of the present embodiment, first, an initial engagement gap between the driven gear and the driving gear is determined, and further, the initial engagement gap is compared with a target engagement gap, and a distance X by which the balance shaft assembly 100 needs to be moved is determined, and then the balance shaft assembly 100 is moved by rotating the adjustment bolt 21.

Illustratively, step S41, determining an initial engagement gap when the driven gear is pre-engaged with the driving gear, includes:

s411, pulling out the balance shaft timing pin, and releasing the phase restriction of the balance shaft assembly 100.

And S412, moving the balance shaft assembly 100 towards a direction away from the adjusting bolt 21, so that the assembling bolt 3 is positioned at one end of the kidney-shaped assembling hole away from the adjusting bolt 21.

At this time, the engagement gap between the balance shaft assembly 100 and the crankshaft assembly 200 is the initial engagement gap.

In some embodiments, step S43, rotating the adjustment bolt 21 such that the balance shaft assembly 100 moves a distance X, includes:

s431, rotating the adjusting bolt 21 to push the balance shaft assembly 100 to move by a moving distance X.

In other embodiments, step S43, rotating the adjusting bolt 21 such that the balance shaft assembly 100 moves a distance X, includes:

s432, rotating the adjusting bolt 21, and enabling the tail end of the adjusting bolt 21 to move by a distance X, and moving the balance shaft assembly 100 in the same direction until the balance shaft assembly 100 is abutted against the tail end of the adjusting bolt 21 again.

The adjustment of the two moving directions of the balance shaft assembly 100 can be achieved using steps S431 and S432.

In some possible implementations, when performing steps S411-S412, step S432 includes:

s4321, the adjusting bolt 21 is rotated toward the first direction so that the head of the adjusting bolt 21 abuts against the balance shaft assembly 100.

S4322, the adjusting bolt 21 is reversely rotated until the tail end of the adjusting bolt 21 moves by a distance X.

S4323, moving the balance shaft assembly 100 towards the direction approaching the adjusting bolt 21 until the balance shaft assembly 100 is abutted against the tail end of the adjusting bolt 21 again, and thus completing the adjustment of the meshing clearance between the driven gear and the driving gear.

In some embodiments, step S43, rotating the adjusting bolt 21 such that the balance shaft assembly 100 moves a distance X, further comprises:

s433, determining the rotation parameters of the adjusting bolt 21 according to the distance X required to be moved by the balance shaft; the rotation parameters include a rotation direction and a rotation angle.

By rotating the adjusting bolt 21 toward different directions, the adjusting bolt 21 can be made to move along both axial ends, so that the balance shaft assembly 100 can move toward both directions, and adjustment of the meshing gap can be achieved.

In some embodiments, step S433, determining the rotation parameter of the adjusting bolt 21 according to the distance X the balance shaft needs to move, includes:

s4331, when the distance X of the balance shaft to be moved is a positive value, the rotation direction of the adjusting bolt 21 is a clockwise direction; when the distance X is a positive value, the adjusting bolt 21 is rotated clockwise so that the balance shaft assembly 100 moves in a direction away from.

S4332, when the distance X of the balance shaft to be moved is a negative value, the rotation direction of the adjusting bolt 21 is a counterclockwise direction; when the distance X is a positive value, the adjusting bolt 21 is rotated counterclockwise so that the balance shaft assembly 100 moves toward the approaching direction.

S4333, the rotation angle θ=360° X/P of the adjusting bolt 21, where P is the pitch of the adjusting bolt 21. By utilizing the relationship between the rotation angle θ and the distance X, the movement distance X of the balance shaft assembly 100 can be precisely controlled by controlling the rotation angle θ, thereby realizing precise adjustment of the engagement gap.

It should be noted that, in the description of the present disclosure, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In this disclosure, unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure.

The foregoing description of the embodiments of the present disclosure is not intended to limit the present disclosure, but rather, any modifications, equivalents, improvements, etc. that fall within the principles of the present disclosure are intended to be included within the scope of the present disclosure.

Claims (10)

1. The meshing clearance adjustment tool is characterized by being suitable for adjusting the meshing clearance between a driven gear of a lower hanging type balance shaft assembly (100) and a driving gear of a crankshaft assembly (200);

the meshing gap adjustment tool comprises a positioning assembly (1) and an adjusting assembly (2);

the positioning assembly (1) comprises a positioning part (11) and a supporting part (12), wherein the supporting part (12) is connected with the positioning part (11), the positioning part (11) is detachably connected with an engine cylinder body (300), and the supporting part (12) is used for supporting the adjusting assembly (2) at a position close to the balance shaft assembly (100);

the adjusting component (2) comprises an adjusting bolt (21), and the tail end of the adjusting bolt (21) is abutted with the balance shaft assembly (100);

the meshing clearance adjustment tool is configured such that the adjusting bolt (21) rotates in a certain direction, the tail end of the adjusting bolt (21) stretches and contracts in the axial direction, and the balance shaft assembly (100) moves along with the tail end of the adjusting bolt (21) to adjust the meshing clearance between the driven gear and the driving gear.

2. The meshing clearance adjustment tool according to claim 1, wherein the balance shaft assembly (100) includes an assembly bolt (3), and the engine block (300) is provided with a kidney-shaped assembly hole (4);

the assembly bolt (3) is matched with the kidney-shaped assembly hole (4);

the axial direction of the adjusting bolt (21) is parallel to the extending direction of the kidney-shaped assembly hole (4), and the balance shaft assembly (100) moves along the kidney-shaped assembly hole (4) so as to adjust the meshing clearance of the driven gear and the driving gear.

3. The meshing clearance adjustment tool according to claim 1, wherein a relation between a rotation angle θ of the adjusting bolt (21) and a movement distance X of the balance shaft assembly (100) satisfies:

X＝P×θ/360°；

wherein P is the pitch of the adjusting bolt (21).

4. The meshing clearance adjustment tool according to claim 1, wherein the adjustment assembly (2) further includes a dial (22), the adjustment bolt (21) is rotatably connected to the dial (22), and the dial (22) is used for indicating an angle by which the adjustment bolt (21) is rotated.

5. The meshing gap adjustment tool according to claim 1, wherein the positioning portion (11) includes a positioning bolt; the engine cylinder body (300) is provided with a positioning hole (5);

the positioning bolt is matched with the positioning hole (5).

6. A method for adjusting a meshing gap, characterized in that the meshing gap adjustment tool according to any one of claims 1 to 5 is adopted; the adjusting method comprises the following steps:

connecting the balance shaft assembly (100) with the engine block (300) such that the driven gear is pre-engaged with the drive gear;

connecting the meshing clearance adjustment tool with the engine cylinder body (300) so that the positioning part (11) is connected with the engine cylinder body (300), and the supporting part (12) supports the adjusting component (2) at a position close to the balance shaft assembly (100);

adjusting the adjusting bolt (21) to an initial state that the tail end of the adjusting bolt (21) abuts against the balance shaft assembly (100);

the adjusting bolt (21) is rotated so that the balance shaft assembly (100) moves with the tip of the adjusting bolt (21) to adjust the meshing gap of the driven gear and the driving gear.

7. The method of adjusting the meshing gap according to claim 6, wherein the rotating the adjustment bolt (21) such that the balance shaft assembly (100) moves with the tip of the adjustment bolt (21) to adjust the meshing gap of the driven gear and the drive gear includes:

determining an initial engagement gap when the driven gear is pre-engaged with the drive gear;

determining a distance X that the balance shaft assembly (100) needs to move according to a difference value between a target meshing gap of the driven gear and the driving gear and the initial meshing gap;

the adjusting bolt (21) is rotated so that the balance shaft assembly (100) moves by a distance X.

8. The method of adjusting the engagement gap according to claim 6, wherein the rotating the adjusting bolt (21) so that the balance shaft assembly (100) moves by a distance X includes:

rotating the adjusting bolt (21) to push the balance shaft assembly (100) to move by a moving distance X;

or,

and rotating the adjusting bolt (21) to enable the tail end of the adjusting bolt (21) to move by a distance X and move the balance shaft assembly (100) in the same direction until the balance shaft assembly (100) is abutted against the tail end of the adjusting bolt (21) again.

9. The method of adjusting the engagement gap according to claim 8, wherein the rotating the adjusting bolt (21) so that the balance shaft assembly (100) moves by a distance X includes:

determining a rotation parameter of the adjusting bolt (21) according to the distance X that the balance shaft needs to move; the rotation parameters include a rotation direction and a rotation angle.

10. The method for adjusting the engagement gap according to claim 9, wherein the determining the rotation parameter of the adjusting bolt (21) according to the distance X that the balance shaft needs to be moved includes:

when the distance X that the balance shaft needs to move is a positive value, the rotation direction of the adjusting bolt (21) is clockwise;

when the distance X that the balance shaft needs to move is a negative value, the rotation direction of the adjusting bolt (21) is a counterclockwise direction;

the rotation angle θ=360° X/P of the adjusting bolt (21), where P is the pitch of the adjusting bolt (21).

Images