CN110834689B - Analysis method of movement mechanism - Google Patents
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Abstract
The invention discloses an analysis method of a motion mechanism, and belongs to the field of mechanical mechanisms. The method comprises the following steps: analyzing the motion mechanism to determine whether the motion mechanism comprises a bypass mechanism; if the bypass mechanism is included, the movement mechanism consists of the bypass mechanism and an original mechanism; the bypass mechanism is used for driving the original mechanism to move according to the original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0. The invention analyzes the motion mechanism to determine whether the motion mechanism contains the bypass mechanism, if so, the bypass mechanism can be removed when the motion track of the motion mechanism is analyzed, and only the motion track of the original mechanism is analyzed, thus simplifying the analysis process of the motion track of the motion mechanism. If the motion mechanism does not contain the bypass mechanism, the motion mechanism can be regarded as an original mechanism, and the bypass mechanism can be added to the original mechanism to serve as a driving piece to provide power for the motion of the original mechanism, so that the adaptability of the motion mechanism in application is improved.
Description
The application is a divisional application of an invention patent application with the application date of 2017, 12 and 19 months, the application number of 201711377143.4 and the name of 'an analysis method of a motion mechanism'.
Technical Field
The invention relates to the field of mechanical mechanisms, in particular to an analysis method of a motion mechanism.
Background
For independently movable mechanical mechanisms, which include a plurality of members that are constrained to one another, the members cooperate to impart a particular motion profile to the mechanism. By analyzing the movement locus of the mechanism, the mechanical action of the mechanism can be better understood.
In the prior art, the motion process of a plurality of components in a mechanism is analyzed simultaneously to determine the motion track of the mechanism.
The inventor finds that the prior art has at least the following technical problems:
when the mechanism includes a large number of components, the analysis process of the movement locus is complicated.
Disclosure of Invention
The embodiment of the invention provides an analysis method of a motion mechanism, which can solve the technical problem. The specific technical scheme is as follows:
there is provided a method of analysis of a motion mechanism, the method comprising: analyzing a motion mechanism to determine whether the motion mechanism comprises a bypass mechanism;
if the bypass mechanism is included, the motion mechanism consists of the bypass mechanism and an original mechanism;
the bypass mechanism is used for driving the original mechanism to move according to an original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0.
In one possible design, the motion mechanism includes the bypass mechanism, and the motion trajectory of the original mechanism is analyzed when analyzing the motion trajectory of the motion mechanism.
In one possible design, the motion mechanism does not include the bypass mechanism, and the motion mechanism is added with the bypass mechanism and serves as an original mechanism;
and driving the original mechanism to move by using the bypass mechanism.
In one possible design, the analyzing the motion mechanism to determine whether the motion mechanism includes a bypass mechanism includes:
determining a base of the movement mechanism;
determining a plurality of sub-mechanisms with one ends connected with the base from the motion mechanisms;
taking each sub-mechanism as a preset bypass mechanism, and taking the part of the motion mechanism except the preset bypass mechanism as a preset original mechanism;
and respectively calculating the degrees of freedom of the preset bypass mechanism relative to the corresponding preset original mechanism, and if the degrees of freedom are 0, determining that the preset bypass mechanism is a target bypass mechanism, and determining that the movement mechanism comprises the bypass mechanism.
In one possible design, the calculating the degree of freedom of the preset bypass mechanism relative to the corresponding preset original mechanism includes:
determining the number of components contained in the preset bypass mechanism;
determining a kinematic pair of a connecting end of each member in the preset bypass mechanism;
if the preset bypass mechanism is a planar mechanism, the degree of freedom is the sum of the number of the members x 3-the degree of freedom constrained by each kinematic pair;
if the preset bypass mechanism is a spatial mechanism, the degree of freedom is the sum of the number of members x 6-the degrees of freedom constrained by each kinematic pair.
In one possible design, when the moving mechanism is a hood hinge, the hood hinge includes: a base;
the lower end of the first rod piece is hinged with the base;
the lower end of the second rod piece is hinged with the base;
the third rod piece is hinged with the upper ends of the first rod piece and the second rod piece;
the lower end of the gas spring component is connected with the base through a cylindrical pair, and the upper end of the gas spring component is connected with the third rod piece through a ball pair;
the gas spring member includes: the first gas spring and the second gas spring are connected from bottom to top through a sliding pair;
analyzing the hood hinge to determine whether the hood hinge includes a bypass mechanism, comprising:
determining the base to be a machine base;
said first rod, said second rod, said gas spring member connected at one end to said housing base are defined from said hood hinge;
respectively taking the first rod, the second rod and the gas spring member as preset bypass mechanisms, and taking the parts of the engine hood hinge except the preset bypass mechanisms as preset original mechanisms;
respectively calculating the degrees of freedom of the first rod piece, the second rod piece and the gas spring member relative to corresponding preset original mechanisms;
when the gas spring member serves as a preset bypass mechanism, the degree of freedom of the gas spring member with respect to a corresponding preset original mechanism is 0, and at this time, it is determined that the gas spring member is the bypass mechanism of the hood hinge.
In one possible design, when analyzing the movement locus of the hood hinge, the gas spring member is removed from the hood hinge, and the base, the first rod, the second rod, and the third rod are combined to form a whole as an original mechanism, and only the movement locus of the original mechanism is analyzed.
In one possible design, when the motion mechanism is a front suspension of an automobile, the front suspension of the automobile includes: the steering engine comprises a steering engine body, an auxiliary frame, a steering inner rod, a steering engine pull rod, a control arm, a steering knuckle, a first sliding column, a second sliding column, a fixed point and a stabilizing piece;
the steering engine body is rigidly connected with the auxiliary frame;
the steering inner rod is connected with the steering machine body through a sliding pair, the steering inner rod is connected with the steering machine pull rod through a universal joint, and the steering machine pull rod is connected with the steering joint through a ball pair;
the control arm is connected with the auxiliary frame through a rotating pair, and the control arm is connected with the steering knuckle through a ball pair;
the steering knuckle is rigidly connected with the first sliding column, the first sliding column is connected with the second sliding column through a sliding pair, and the second sliding column is connected with the fixed point through a ball pair;
the stabilizer includes: the stabilizer bar is connected with the auxiliary frame through a rotating pair, the stabilizer bar is connected with the connecting rod through a universal joint, and the connecting rod is connected with the first sliding column through a ball pair;
analyzing the automobile front suspension to determine whether the automobile front suspension comprises a bypass mechanism, comprising:
determining that the whole formed by the steering engine body, the auxiliary frame and the fixed point is a machine base;
determining the steering inner rod, the control arm, the second sliding column and the stabilizing piece, wherein one end of the steering inner rod, one end of the control arm, one end of the second sliding column and one end of the stabilizing piece are connected with the base;
respectively taking the steering inner rod, the control arm, the second sliding column and the stabilizing piece as preset bypass mechanisms, and taking the parts of the front suspension of the automobile except the preset bypass mechanisms as preset original mechanisms;
respectively calculating the degrees of freedom of the steering inner rod, the control arm, the second sliding column and the stabilizing part relative to corresponding preset original mechanisms;
and when the stabilizing member is used as a preset bypass mechanism, the degree of freedom of the stabilizing member relative to the corresponding preset original mechanism is 0, and at the moment, the stabilizing member is determined to be the bypass mechanism of the front suspension of the automobile.
In one possible design, when analyzing the movement locus of the front suspension of the automobile, the stabilizer is removed from the front suspension of the automobile, the remaining part of the front suspension of the automobile, from which the stabilizer is removed, is used as an original structure, and only the movement locus of the original structure is analyzed.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the motion mechanism is analyzed to determine whether the motion mechanism contains a bypass mechanism, the motion mechanism is used for driving the original mechanism to move according to the original track based on the definition of the bypass mechanism, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0. Therefore, according to the condition, if the motion mechanism is determined to contain the bypass mechanism, when the motion track of the motion mechanism is analyzed, the bypass mechanism can be removed, and only the motion track of the original mechanism is analyzed, so that the analysis process of the motion track of the motion mechanism can be simplified. In addition, because the degree of freedom of the bypass mechanism relative to the original mechanism is 0, the original mechanism is driven through the bypass mechanism, if the motion mechanism does not contain the bypass mechanism, the motion mechanism can be regarded as the original mechanism, and in this case, the bypass mechanism can be added to the original mechanism to be used as a driving piece on the basis of not changing the motion track of the original mechanism, so that power can be provided for the motion of the original mechanism, and the adaptability of the motion mechanism in application is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in 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 invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a movement mechanism provided by an embodiment of the invention as a hood hinge mechanism;
fig. 2 is a schematic structural diagram of a motion mechanism provided by an embodiment of the invention and being an automobile front suspension mechanism.
The reference numerals denote:
a-a base, wherein the base is provided with a plurality of grooves,
b-a first bar member, the first bar member,
c-a second rod member, wherein,
d-a third bar member,
e-a gas spring member, the gas spring member,
e 1-the first gas spring,
e 2-a second gas spring,
a-the main body of the steering machine,
b-the auxiliary frame is arranged on the front frame,
c-turning an inner rod to the direction,
d-a pull rod of the steering gear,
e-controlling the arm to move the arm,
f-the steering knuckle is arranged on the front end of the steering wheel,
g-a first slide column and a second slide column,
h-the second sliding column is arranged on the upper portion of the sliding column,
i-the point of fixation is shown,
a J-stabilizing piece is arranged on the upper portion of the frame,
j1-a stabilizer bar, which is,
j2-connecting rod.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides an analysis method of a motion mechanism, which comprises the following steps: analyzing the motion mechanism to determine whether the motion mechanism comprises a bypass mechanism; if the bypass mechanism is included, the movement mechanism consists of the bypass mechanism and the original mechanism. The bypass mechanism is used for driving the original mechanism to move according to the original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0.
According to the method provided by the embodiment of the invention, whether the motion mechanism contains the bypass mechanism or not is determined by analyzing the motion mechanism, based on the definition of the bypass mechanism, the motion mechanism is used for driving the original mechanism to move according to the original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0. Therefore, according to the condition, if the motion mechanism is determined to contain the bypass mechanism, when the motion track of the motion mechanism is analyzed, the bypass mechanism can be removed, and only the motion track of the original mechanism is analyzed, so that the analysis process of the motion track of the motion mechanism can be simplified.
In addition, because the degree of freedom of the bypass mechanism relative to the original mechanism is 0, the original mechanism is driven through the bypass mechanism, if the motion mechanism does not contain the bypass mechanism, the motion mechanism can be regarded as the original mechanism, and in this case, the bypass mechanism can be added to the original mechanism to be used as a driving piece on the basis of not changing the motion track of the original mechanism, so that power can be provided for the motion of the original mechanism, and the adaptability of the motion mechanism in application is improved.
In an embodiment of the present invention, the movement mechanism includes: the moving mechanism includes a base which is always fixed, and a plurality of moving members which are provided on the base, wherein the moving members include a driving member (a member which moves actively) and a driven member (a member which moves passively). The conditions that the motion mechanism performs the motion are as follows: the degree of freedom of the motion mechanism is greater than or equal to 1, and the number of prime movers of the motion mechanism is equal to the number of degrees of freedom of the motion mechanism. In an embodiment of the invention, the bypass mechanism may be understood as a prime mover.
The original motion track of the original mechanism refers to the motion track obtained by the original mechanism under the driving of the prime mover. That is, the motion trajectory of the original mechanism driven by the prime mover (i.e., the original motion trajectory) is consistent with the motion trajectory of the original mechanism driven by the bypass mechanism.
The degree of freedom of the bypass mechanism relative to the original mechanism is 0, which means that the bypass mechanism and the original mechanism are completely constrained (i.e. the bypass mechanism and the original mechanism are completely constrained with each other), the motion relations of the bypass mechanism and the original mechanism are in one-to-one correspondence, when the original mechanism does not move, the bypass mechanism cannot move, and when the bypass mechanism moves, the original mechanism is driven to move by the bypass mechanism.
The function of the bypass mechanism in the analysis of the movement mechanism is explained in detail below:
and if the motion mechanism is analyzed, determining that the motion mechanism comprises a bypass mechanism, and analyzing the motion track of the original mechanism when analyzing the motion track of the motion mechanism.
For a motion mechanism including a bypass mechanism, when analyzing the motion trajectory of the motion mechanism, the bypass mechanism may be removed from the motion mechanism (for example, the bypass mechanism may be directly removed, or the presence of the bypass mechanism may be directly ignored, in which case the bypass mechanism may not be actually removed), and after removing the bypass mechanism, the motion trajectory of the remaining original mechanism is analyzed. Specifically, the movement locus of the original mechanism can be analyzed by calculating the degree of freedom of the original mechanism.
Further, when the motion mechanism is improved and optimized, the original mechanism of the core of the motion mechanism can be directly improved by removing the bypass mechanism, and the removal of the bypass mechanism is convenient for visually observing the connection relation of the original mechanism and can reduce the workload.
The bypass mechanism can be used for driving the original mechanism to move according to the original track, when the motion mechanism is analyzed and determined not to contain the bypass mechanism, the motion mechanism can be optionally additionally provided with the bypass mechanism, and at the moment, the motion mechanism serves as the original mechanism and is driven to move by the bypass mechanism.
The bypass mechanism is used for driving the original mechanism to move, and power is provided for the movement of the original mechanism on the premise of not changing the movement track and the action of the original mechanism. By the operation, the power source of the original mechanism is changed, and a bypass mechanism which is convenient to drive is added to the original mechanism which is inconvenient to drive, so that the original mechanism can move more conveniently. And according to the field use requirement, the bypass mechanism is selectively driven to further drive the original mechanism to move, or the original mechanism is directly driven to move by the original driving piece, so that the diversity of selection is increased, and the application range of the original mechanism is expanded.
As can be seen from the above, the bypass mechanism has an important meaning for simplifying the analysis process of the movement mechanism, and as mentioned above, the bypass mechanism is used for driving the original mechanism to move according to the original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0, it can be seen that when determining the bypass mechanism, the determination can be performed according to the above conditions. Specifically, whether the motion mechanism includes a bypass mechanism may be determined according to the following method:
the base of the movement mechanism is determined.
A plurality of sub-mechanisms are defined from the moving mechanism, one end of each sub-mechanism being connected to the base.
And taking each sub-mechanism as a preset bypass mechanism, and taking the part of the motion mechanism except the preset bypass mechanism as a preset original mechanism.
And respectively calculating the degree of freedom of the preset bypass mechanism relative to the corresponding preset original mechanism, and determining the preset bypass mechanism as a target bypass mechanism if the degree of freedom is 0, wherein at the moment, the movement mechanism can be determined to comprise the bypass mechanism.
Through the steps, whether the motion mechanism comprises the bypass mechanism or not can be determined, and analysis of the motion mechanism is simplified. The mechanism satisfying the above condition can be added to the motion mechanism as a bypass mechanism to drive the motion of the motion mechanism.
In the embodiment of the invention, the base of the movement mechanism refers to: the moving mechanism is a static component all the time in the moving process, so that the machine base always provides support for other components in the moving process.
The determination of the plurality of sub-mechanisms with one end connected with the base from the motion mechanism means that the sub-mechanisms with only one end connected with the base are found in the motion mechanism, and the sub-mechanisms can be single components or a combination of a plurality of components.
After the plurality of sub-mechanisms are determined, each sub-mechanism is respectively used as a preset bypass mechanism, that is, the sub-mechanism is assumed to be a bypass mechanism, at this time, the preset bypass mechanism is removed from the movement mechanism, and the remaining part can be used as a corresponding preset original mechanism. And then, calculating the degree of freedom of the preset bypass mechanism relative to the corresponding preset original mechanism. Specifically, the degree of freedom of the preset bypass mechanism relative to the preset original mechanism can be calculated by the following method:
the number of components included in the preset bypass mechanism is determined.
A kinematic pair defining a connection end of each member.
If the predetermined bypass mechanism is a planar mechanism, the above-mentioned degree of freedom is the number of members x 3 — the sum of the degrees of freedom constrained by each kinematic pair.
If the bypass mechanism is a spatial mechanism, the above-mentioned degree of freedom is the sum of the number of members × 6 — the degree of freedom constrained by each kinematic pair.
By the above calculation method, the degree of freedom of the preset bypass mechanism relative to the preset original mechanism can be calculated to determine whether the preset bypass mechanism is a truly existing bypass mechanism, that is, the target bypass mechanism. It will be appreciated that the planar mechanism described above refers to the movement of the pre-set bypass mechanism in one plane.
The space mechanism refers to a preset bypass mechanism which moves in the space.
For the kinematic mechanism, the kinematic pairs of the connecting ends of the various members are known by observation, and the number of degrees of freedom constrained by each type of kinematic pair is known and determined. For example, in a planar mechanism, when the kinematic pair is articulated, it constrains two degrees of freedom.
The sum of the degrees of freedom constrained by each kinematic pair means that the number of degrees of freedom constrained by each kinematic pair is added and summed to calculate how many degrees of freedom are constrained by the kinematic pairs in total.
In the planar mechanism, each member has three degrees of freedom, respectively: x, y, and θ respectively represent the distance moved along the x-axis, the distance moved along the y-axis, and the angle of rotation. Therefore, the total number of degrees of freedom of the bypass mechanism is 3 when the bypass mechanism is not constrained by the kinematic pair.
In the space mechanism, each member has 6 degrees of freedom, x, y, z, a, b, c, respectively, which represent the distance moved along the x-axis, the distance moved along the y-axis, the distance moved along the z-axis, the angle of rotation about the x-axis, the angle of rotation about the y-axis, and the angle of rotation about the z-axis. Therefore, the total number of degrees of freedom of the preset bypass mechanism is 6 when the mechanism is not constrained by the kinematic pair.
Therefore, when the degree of freedom of the preset bypass mechanism is calculated, the total degree of freedom of the preset bypass mechanism when the preset bypass mechanism is not constrained is only required to be subtracted by the degree of freedom constrained by the kinematic pair.
If the preset bypass mechanism is a planar mechanism, the degree of freedom is the sum of the number of the members and the degree of freedom constrained by each kinematic pair;
if the bypass mechanism is a spatial mechanism, the number of degrees of freedom is 6, the sum of the degrees of freedom constrained by each kinematic pair.
The following will explain the analysis method of the motion mechanism provided by the present invention by a specific embodiment:
as an example:
as shown in fig. 1, when the moving mechanism is a hood hinge, the hood hinge includes: a base a;
the lower end of the first rod piece b is hinged with the base a;
the lower end of the second rod piece is hinged with the base a;
a third rod member d hinged with the upper ends of the first rod member b and the second rod member c;
the lower end of the gas spring member e is connected with the base a through a cylindrical pair, and the upper end of the gas spring member e is connected with the third rod d through a ball pair;
the gas spring member e includes: the first gas spring e1 and the second gas spring e2 which are connected from bottom to top are connected through a sliding pair.
Analyzing the hood hinge to determine whether the hood hinge includes a bypass mechanism, comprising:
and determining the base a as a base.
A first rod b, a second rod c, and a gas spring member e are defined from the hood hinge and have one end connected to the housing.
The first rod b, the second rod c and the gas spring member e are respectively used as preset bypass mechanisms, and the part of the engine hood hinge except the preset bypass mechanisms is used as a preset original mechanism.
The degrees of freedom of the first rod b, the second rod c and the gas spring member e relative to the corresponding preset original mechanisms are respectively calculated.
When the gas spring member e serves as a preset bypass mechanism, the degree of freedom of the gas spring member e relative to the corresponding preset original mechanism is 0, and at this time, the gas spring member e is determined to be the bypass mechanism of the hood hinge.
Since the base a is fixed to the vehicle body when the hood hinge is operated, the base a is determined as a seat. Then determining the sub-components with one ends connected with the base as follows: a first rod b, a second rod c, a gas spring member e.
Taking the first rod b as a preset bypass mechanism, and taking the first rod b as a plane mechanism, and calculating the degree of freedom of the first rod b relative to a corresponding preset original mechanism, wherein in the plane mechanism, two degrees of freedom are constrained in an articulated manner:
Fb3-1-2-1, the relative degree of freedom is different from 0.
Taking the second rod c as a preset bypass mechanism, and taking the second rod c as a plane mechanism, and calculating the degree of freedom of the second rod c relative to a corresponding preset original mechanism, wherein in the plane mechanism, two degrees of freedom are hinged and restrained:
Fc3-1-2-1, the relative degree of freedom is different from 0.
With gas spring member e as presetting the bypass mechanism to it is spatial mechanism (based on the existence of cylinder pair and ball pair), calculate gas spring member e for the corresponding degree of freedom of presetting original mechanism, in the spatial mechanism, the vice 5 degrees of freedom of restraint of sliding, 4 degrees of freedom of the vice restraint of cylinder, 3 degrees of freedom of ball pair restraint:
fe-6-2-5-1-4-1-3-1-0, with a relative degree of freedom of 0.
Therefore, it is concluded that: the gas spring member e may act as a bypass mechanism in the hood hinge mechanism.
Based on the above, when analyzing the movement locus of the hood hinge, the gas spring member e is removed from the hood hinge, and the movement locus of the original mechanism is analyzed using the whole of the first rod b, the second rod c, the third rod d, and the base a as the original mechanism.
By eliminating the gas spring member e from the hood hinge, the amount of calculation in analyzing the original mechanism is reduced, facilitating optimization, improvement, etc. of the original mechanism.
As another example:
as shown in fig. 2, when the moving mechanism is a front suspension of an automobile, the front suspension of the automobile comprises: the steering engine comprises a steering engine body A, an auxiliary frame B, a steering inner rod C, a steering engine pull rod D, a control arm E, a steering knuckle F, a first sliding column G, a second sliding column H, a fixed point I and a stabilizing piece J.
Wherein, the steering engine body A and the auxiliary frame B are rigidly connected.
The steering inner rod C is connected with the steering machine body A through a sliding pair, the steering inner rod C is connected with the steering machine pull rod D through a universal joint, and the steering machine pull rod D is connected with the steering joint F through a ball pair.
The control arm E is connected with the auxiliary frame B through a rotating pair, and the control arm E is connected with the steering knuckle F through a ball pair.
The steering knuckle F is in rigid connection with the first sliding column G, the first sliding column G is connected with the second sliding column H through a sliding pair, and the second sliding column H is connected with the fixed point I through a ball pair.
The stabilizer J comprises a stabilizer J1 and a connecting rod J2 which are connected in sequence, a stabilizer J1 is connected with the auxiliary frame B through a rotating pair, a stabilizer J1 is connected with a connecting rod J2 through a universal joint, and a connecting rod J2 is connected with the first sliding column G through a ball pair.
Analyzing the front suspension of the automobile to determine whether the front suspension of the automobile comprises a bypass mechanism, comprising:
and determining that the whole formed by the steering machine body A, the auxiliary frame B and the fixed point I is a machine base.
A steering inner rod C, a control arm E, a second sliding column H and a stabilizing piece J, wherein one end of the steering inner rod C is connected with the base, and the stabilizing piece J is determined from the front suspension of the automobile.
The steering inner rod C, the control arm E, the second sliding column H and the stabilizing piece J are respectively used as preset bypass mechanisms, and the part of the automobile front suspension except the preset bypass mechanisms is used as a preset original mechanism.
And respectively calculating the degrees of freedom of the steering inner rod C, the control arm E, the second sliding column H and the stabilizing piece J relative to the corresponding preset original mechanisms.
When the stabilizer J serves as a preset bypass mechanism, the degree of freedom of the stabilizer J relative to the corresponding preset original mechanism is 0, and at this time, the gas spring member stabilizer J is determined as a target bypass mechanism.
In the motion process of the front suspension of the automobile, the steering engine body A, the auxiliary frame B and the fixing point E are fixed, and the steering engine body A, the auxiliary frame B and the fixing point E are used as a base of the front suspension mechanism of the automobile.
And determining a steering inner rod C, a control arm E, a second sliding column H and a stabilizing piece J, wherein one end of the steering inner rod C is connected with the base.
Taking the steering inner rod C as a preset bypass mechanism, calculating the degree of freedom of the steering inner rod C relative to a corresponding preset original mechanism, wherein in a space mechanism, a sliding pair restrains 5 degrees of freedom, and a universal joint restrains 4 degrees of freedom:
FC6-1-5-1-4-1-3, the relative degree of freedom is not 0.
Taking the control arm E as a preset bypass mechanism, calculating the degree of freedom of the control arm E relative to a corresponding preset original mechanism, wherein in the space mechanism, the revolute pair constrains 5 degrees of freedom, and the ball pair constrains 3 degrees of freedom:
FE6-1-5-1-3-1-2, the relative degree of freedom is not 0.
Taking the second sliding column H as a preset bypass mechanism, calculating the degree of freedom of the second sliding column H relative to a corresponding preset original mechanism, wherein in a space mechanism, a sliding pair constrains 5 degrees of freedom, and a ball pair constrains 3 degrees of freedom:
FH6-1-5-1-3-1-2, the relative degree of freedom is not 0.
Taking the stabilizing part J as a preset bypass mechanism, calculating the degree of freedom of the stabilizing part J relative to a corresponding preset original mechanism, wherein in the space mechanism, the rotating pair constrains 5 degrees of freedom, the universal joint constrains 4 degrees of freedom, and the ball pair constrains 3 degrees of freedom:
FJ6-2-5-1-4-1-3-1-0, with a relative degree of freedom of 0.
Therefore, it is concluded that the stabilizer J can function as a bypass mechanism in the front suspension mechanism of the automobile.
Based on the above, when the movement locus of the front suspension of the automobile is analyzed, the stabilizer J is removed from the front suspension of the automobile, and the movement locus of the original structure is analyzed with the remaining part of the front suspension of the automobile excluding the stabilizer J as the original structure.
By removing the stabilizer J from the front suspension of the automobile, the amount of calculation in analyzing the original mechanism is reduced, and optimization, improvement and the like of the original mechanism are facilitated.
The above two embodiments provide specific steps for determining the bypass mechanism from the moving mechanism, and by using the determination method, the bypass mechanism can be added to the original mechanism as the driving member. The added mechanism can form the bypass mechanism only by meeting the judgment condition.
For example, when the new mechanism is used as a bypass mechanism in the motion mechanism, one end of the new mechanism is connected to the base, and the other end of the new mechanism is connected to the movable member of the motion mechanism. And then determining the kinematic pair of the connecting end of each component of the newly added mechanism, so that the sum of the constrained degrees of freedom of the kinematic pair is equal to the total unconstrained degree of freedom of each component in the newly added mechanism, and the degree of freedom of the newly added mechanism relative to the kinematic mechanism is 0, and at the moment, the newly added mechanism meets the judgment condition of the bypass mechanism, can be added to the kinematic mechanism as the bypass mechanism, and does not influence the motion track of the kinematic mechanism.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method of analyzing a motion mechanism, the method comprising: analyzing a motion mechanism to determine whether the motion mechanism comprises a bypass mechanism;
if the bypass mechanism is included, the motion mechanism consists of the bypass mechanism and an original mechanism;
the bypass mechanism is used for driving the original mechanism to move according to an original track, and the degree of freedom of the bypass mechanism relative to the original mechanism is 0;
the motion is automobile front suspension, automobile front suspension includes: the steering engine comprises a steering engine body (A), an auxiliary frame (B), a steering inner rod (C), a steering engine pull rod (D), a control arm (E), a steering knuckle (F), a first sliding column (G), a second sliding column (H), a fixed point (I) and a stabilizing piece (J);
the steering machine body (A) is in rigid connection with the auxiliary frame (B);
the steering inner rod (C) is connected with the steering machine body (A) through a sliding pair, the steering inner rod (C) is connected with the steering machine pull rod (D) through a universal joint, and the steering machine pull rod (D) is connected with the steering joint (F) through a ball pair;
the control arm (E) is connected with the auxiliary frame (B) through a rotating pair, and the control arm (E) is connected with the steering knuckle (F) through a ball pair;
the steering knuckle (F) is rigidly connected with the first sliding column (G), the first sliding column (G) is connected with the second sliding column (H) through a sliding pair, and the second sliding column (H) is connected with the fixed point (I) through a ball pair;
the stabilizer (J) includes: a stabilizer bar (J1) and a connecting rod (J2) which are connected in sequence, wherein the stabilizer bar (J1) is connected with the auxiliary frame (B) through a rotating pair, the stabilizer bar (J1) is connected with the connecting rod (J2) through a universal joint, and the connecting rod (J2) is connected with the first sliding column (G) through a ball pair;
analyzing the automobile front suspension to determine whether the automobile front suspension comprises a bypass mechanism, comprising:
determining that the whole formed by the steering machine body (A), the auxiliary frame (B) and the fixed point (I) is a machine base;
determining the steering inner rod (C), the control arm (E), the second sliding column (H) and the stabilizing piece (J) which are connected with the base at one end from the front suspension of the automobile;
respectively taking the steering inner rod (C), the control arm (E), the second sliding column (H) and the stabilizing part (J) as preset bypass mechanisms, and taking the parts of the front suspension of the automobile excluding the preset bypass mechanisms as preset original mechanisms;
respectively calculating the degrees of freedom of the steering inner rod (C), the control arm (E), the second sliding column (H) and the stabilizing part (J) relative to corresponding preset original mechanisms;
when the stabilizing member (J) is used as a preset bypass mechanism, the degree of freedom of the stabilizing member (J) relative to a corresponding preset original mechanism is 0, and at the moment, the stabilizing member (J) is determined to be the bypass mechanism of the front suspension of the automobile.
2. The method of claim 1, wherein the motion mechanism comprises the bypass mechanism, and the motion trajectory of the original mechanism is analyzed when analyzing the motion trajectory of the motion mechanism.
3. The method according to claim 1, wherein the motion mechanism does not include the bypass mechanism, the motion mechanism being added with the bypass mechanism as a home mechanism;
and driving the original mechanism to move by using the bypass mechanism.
4. The method of claim 1, wherein analyzing the motion mechanism to determine whether the motion mechanism includes a bypass mechanism comprises:
determining a base of the movement mechanism;
determining a plurality of sub-mechanisms with one ends connected with the base from the motion mechanisms;
taking each sub-mechanism as a preset bypass mechanism, and taking the part of the motion mechanism except the preset bypass mechanism as a preset original mechanism;
and respectively calculating the degrees of freedom of the preset bypass mechanism relative to the corresponding preset original mechanism, and if the degrees of freedom are 0, determining that the preset bypass mechanism is a target bypass mechanism, and determining that the movement mechanism comprises the bypass mechanism.
5. The method of claim 4, wherein said calculating degrees of freedom of said preset bypass mechanism relative to a corresponding preset original mechanism comprises:
determining the number of components contained in the preset bypass mechanism;
determining a kinematic pair of a connecting end of each member in the preset bypass mechanism;
if the preset bypass mechanism is a planar mechanism, the degree of freedom is the sum of the number of the members x 3-the degree of freedom constrained by each kinematic pair;
if the preset bypass mechanism is a spatial mechanism, the degree of freedom is the sum of the number of members x 6-the degrees of freedom constrained by each kinematic pair.
6. A method according to claim 1, characterized in that when analyzing the movement locus of the front suspension of the automobile, the stabilizer (J) is removed from the front suspension of the automobile, the remaining part of the front suspension of the automobile excluding the stabilizer (J) is taken as the original mechanism, and only the movement locus of the original mechanism is analyzed.
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| JPH10119848A (en) * | 1996-10-16 | 1998-05-12 | Nissan Motor Co Ltd | Assembling device for automobile parts |
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