CN113757293B - Piston for shock absorber and shock absorber - Google Patents
Piston for shock absorber and shock absorber Download PDFInfo
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- CN113757293B CN113757293B CN202111078845.9A CN202111078845A CN113757293B CN 113757293 B CN113757293 B CN 113757293B CN 202111078845 A CN202111078845 A CN 202111078845A CN 113757293 B CN113757293 B CN 113757293B
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- valve body
- piston
- shock absorber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/3405—Throttling passages in or on piston body, e.g. slots
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
- F16F9/3482—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body the annular discs being incorporated within the valve or piston body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
- F16F9/3485—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body characterised by features of supporting elements intended to guide or limit the movement of the annular discs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
- F16F9/3488—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body characterised by features intended to affect valve bias or pre-stress
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention belongs to the field of shock absorbers, and particularly relates to a piston for a shock absorber and the shock absorber.
Description
Technical Field
The invention belongs to the field of shock absorbers, and particularly relates to a piston for a shock absorber and the shock absorber.
Background
In the running process of the vehicle, in order to increase the comfort of a passenger and reduce the damage of the vehicle on severe ground, shock absorbers are arranged between wheels and a frame of the vehicle; in order to increase comfort and safety, the shock absorbers are installed on the existing motorcycles, when the motorcycles meet uneven ground, the front fork tube of the shock absorbers move downwards, hydraulic oil in a cavity formed by the lower end of the front fork tube, the inner wall of the bottom cylinder and the outer wall of the piston rod is compressed, and enters the fluid cavity through the fourth fluid hole to form damping force, but when the motorcycles with large displacement (the displacement is more than 250) or large load capacity (more than 150 kilograms) suddenly pass through the uneven ground, particularly severe road surfaces such as pits or ditches, the damping force is not enough to support the weight of a motorcycle body, the front fork tube impacts the bottom of the bottom cylinder, so that the shock absorbers are damaged or overturned, and personal injury is caused.
Disclosure of Invention
The invention provides a piston for a shock absorber, aiming at solving the problem that when a motorcycle with large displacement or large load capacity suddenly sinks or ditches and other severe road surfaces, the damping force is not enough to support the weight of a motorcycle body, a front fork tube impacts the bottom of a bottom cylinder, so that the shock absorber is damaged or overturned, and further personal injury is caused.
The invention provides a piston for a shock absorber, which comprises
The piston rod is internally provided with a fluid cavity, and one end of the piston rod is a piston end;
and a piston valve generating a damping force, the piston valve being fixed in a fluid chamber at the piston end;
the piston valve separates a fluid chamber into an upper fluid chamber and a lower fluid chamber and generates a damping force according to a pressure difference between the upper fluid chamber and the lower fluid chamber.
The invention provides a piston for a shock absorber, wherein a supporting unit is arranged on a fluid cavity;
the piston valve comprises an elastic element, a valve body and a valve body fixing piece,
the valve body comprises an upper end face and a lower end face of the valve body, a first fluid hole facilitating fluid flow is formed in the valve body, the first fluid hole penetrates through the upper end face and the lower end face of the valve body, and fluid grooves facilitating fluid flow are formed in the periphery of the valve body;
the valve body fixing piece is provided with a second fluid hole which is convenient for fluid to flow, and the second fluid hole is communicated with the first fluid hole;
one end of the elastic element is connected with the supporting unit, and the other end of the elastic element is connected with the lower end face of the valve body, so that the upper end face of the valve body is connected with the valve body fixing piece; the valve body fixing piece is fixedly and hermetically connected with the fluid cavity;
when the lower end face of the valve body is subjected to the pressure of fluid, the upper end face of the valve body is in sealing connection with the valve body fixing piece, so that the fluid groove is cut off, and the fluid flows out through the first fluid hole and the second fluid hole in sequence; when the upper end face of the valve body is subjected to the pressure of fluid, the upper end face of the valve body is separated from the valve body fixing piece, and the fluid flows in from the second fluid hole and the fluid groove respectively after passing through the first fluid hole.
The invention provides a piston for a shock absorber, wherein the end surface of a valve body fixing piece comprises a hole part and a valve body fixing piece body part, and the projection surface of a fluid groove is arranged on the valve body fixing piece body part. Namely, the projection surface of the fluid groove projected on the end surface of the valve body fixing member does not coincide with the hole portion and does not intersect therewith. The cross section of the second fluid hole is internal hexagon, the outer side of the valve body fixing piece is provided with an external thread, the fluid cavity is internally provided with an internal thread, and the valve body fixing piece is in threaded sealing connection with the fluid cavity.
The invention provides a piston for a shock absorber, wherein a supporting unit is a supporting eave, and the diameter of a fluid cavity above the supporting eave is larger than that below the supporting eave.
The invention provides a piston for a shock absorber, which further comprises an elastic element fixing piece for fixing the lower end of an elastic element, wherein the lower end of the elastic element fixing piece is connected with a supporting eave in a sealing manner. The fixed elastic element is arranged to protect the elastic element and prevent the elastic element from displacement.
The invention provides a piston for a shock absorber, wherein an accommodating cavity with an opening at the upper end and a third fluid hole communicated with the accommodating cavity are arranged on an elastic element fixing piece, the accommodating cavity is matched with the lower end of an elastic element, and the third fluid hole is communicated with a first fluid hole through the accommodating cavity.
The invention provides a piston for a shock absorber, wherein an elastic element is a compression spring with gradually increasing screw pitch. The horn-type compression spring is convenient to fix and can be prevented from displacing under the impact of hydraulic oil.
The invention provides a piston for a shock absorber, wherein a plurality of pins for preventing an elastic element from sliding on a valve body are arranged on the lower end face of the valve body.
The invention provides a piston for a shock absorber, wherein the surface of each pin, which is in contact with an elastic element, is an arc-shaped surface, each pin extends into the piston from one end with a small diameter of a compression spring, and the arc-shaped surfaces of the pins are matched and fixed with the compression spring.
The invention provides a piston for a shock absorber, wherein at least 2 fluid grooves are uniformly formed in the periphery of a valve body, so that the impact force of hydraulic oil is uniformly distributed in each part, and the valve body is uniformly stressed.
The invention provides a shock absorber which comprises a piston, a bottom cylinder and a front fork tube, wherein one end of the front fork tube extends into the bottom cylinder and is connected with the bottom cylinder in a sliding and sealing manner; one end of the piston is fixed with the bottom of the bottom cylinder, and the other end of the piston extends into the front fork tube and is connected with the front fork tube in a sliding and sealing manner
The invention has the beneficial effects that: the piston valve is arranged to separate a fluid cavity into an upper fluid cavity and a lower fluid cavity, and generate damping force according to the pressure difference between the upper fluid cavity and the lower fluid cavity, so that when a motorcycle with large displacement or heavy load suddenly passes through a pit or a ditch and other severe road surfaces, the front fork pipe can not impact the bottom of the bottom cylinder by the damping force generated by the piston valve when the motorcycle with large displacement or heavy load suddenly passes through the pit or the ditch; and the shock absorber can play a role in buffering and damping, the safety and comfort of riding personnel are ensured, and the damage to the shock absorber is avoided.
When a motorcycle with large displacement or large load suddenly passes through a pit or a ditch, a front fork tube of the shock absorber moves downwards to compress hydraulic oil in a bottom cylinder, so that hydraulic oil in a cavity formed by the lower end of the front fork tube, the inner wall of the bottom cylinder and the outer wall of a piston rod is compressed, the hydraulic oil enters a fluid cavity through a fourth fluid hole to form a first damping force, the hydraulic oil entering the fluid cavity forms a pressure difference in a third fluid hole to generate a second damping force, the hydraulic oil enters an accommodating cavity and enters the cavity of the front fork tube through the first fluid hole to form a pressure difference to generate a third damping force, and at the moment, when the lower end face of a valve body of the valve body is subjected to the pressure of fluid, the valve body is subjected to the upward elastic force of a compression spring and the upward pressure of the hydraulic oil, so that the upper end face of the valve body is hermetically connected with a valve body fixing piece, and the fluid groove is stopped and flows out through the first fluid hole to form a pressure difference to generate a third damping force; after three times of damping force, the front fork pipe can not impact the bottom of the bottom cylinder when the motorcycle with large displacement or large load capacity suddenly sinks or ditches; and the shock absorber can play a role in buffering and damping, the safety and comfort of riding personnel are ensured, and the damage to the shock absorber is avoided.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of a piston for a shock absorber according to the present invention;
FIG. 2 is a schematic view of the piston rod construction;
FIG. 3 is a schematic diagram of the piston valve configuration;
FIG. 4 is an exploded view of the piston valve;
FIG. 5 is a bottom plan view of the valve body and valve body retainer in combination;
FIG. 6 is a bottom view of the valve body retainer;
FIG. 7 is a bottom view of the valve body;
fig. 8 is a schematic view of the structure of the shock absorber.
Wherein: a piston 100; a piston rod 110; a fluid chamber 111; an upper fluid chamber 1111; a lower fluid chamber 1112; a support unit 112; a piston end 113; a fixed end 114; a fourth fluid aperture 115; a damping orifice 116; a piston valve 120; an elastic member 121; a valve body 122; a valve body upper end surface 1221; a valve body lower end surface 1222; a first fluid orifice 1223; a fluid reservoir 1224; a pin 1225; a valve body fixing member 123; a second fluid aperture 1231; an aperture portion 1232; a valve body fixing member body portion 1233; a resilient element mount 124; a receiving chamber 1241; a third fluid orifice 1242; a bottom tube 200; the front fork 300.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "sealing liquid level", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "seal level", "vertical", and the like do not imply that the components are absolutely sealed level or overhang, but may be slightly inclined. Such as "seal level" simply means that the direction is more seal level than "vertical" and does not mean that the structure must be completely seal level, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "mounted" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, a piston 100 for a shock absorber includes a piston rod 110 and a piston valve 120 for generating a damping force, wherein a fluid chamber 111 is disposed in the piston rod 110, one end of the piston rod 110 is a piston end 113, the other end is a fixed end 114, the fixed end 114 is used for fixing the piston rod 110, i.e., the fixed end 114 of the piston rod 110 is sealed, and the end is provided with a blind threaded hole, so as to facilitate fixing the piston rod 110, wherein the fixed end 114 of the piston rod 110 is fixedly connected with a bottom tube 200 of the shock absorber, a plurality of fourth fluid holes 115 are disposed above the piston rod 110 near the fixed end 114, when the piston end 113 of the piston rod 110 moves upward or downward relative to a front fork 300 of the shock absorber, i.e., when the front fork 300 moves downward or upward, fluid flows into or flows out of the fluid chamber 111 from the fourth fluid holes 115, and the piston rod 110 is provided with a damping hole 116, wherein the piston valve 120 is fixed in the fluid chamber 111 of the piston end 113; piston valve 120 separates fluid chamber 111 into an upper fluid chamber 1111 and a lower fluid chamber 1112, wherein damping port 116 communicates with lower fluid chamber 1112 and generates a damping force based on a pressure difference between upper fluid chamber 1111 and lower fluid chamber 1112.
Referring to fig. 2 to 4, a piston for a shock absorber, wherein a supporting unit 112 is disposed on a fluid chamber 111; the supporting unit 112 may be a supporting ledge or a supporting groove, the piston valve 120 includes an elastic element 121, a valve body 122 and a valve body fixing member 123, referring to fig. 7, the valve body 122 includes a valve body upper end surface 1221 and a valve body lower end surface 1222, the valve body 122 is provided with a first fluid hole 1223 facilitating fluid flow, a cross-sectional area of the first fluid hole 1223 is far smaller than a cross-sectional area of the fourth fluid hole 115 and far smaller than a cross-sectional area of the second fluid hole 1231 and a cross-sectional area of the third fluid hole 1242, a damping force is formed, the first fluid hole 1223 penetrates through the valve body upper end surface 1221 and the valve body lower end surface 1222, and a fluid groove 1224 facilitating fluid flow is disposed around the valve body 122;
a second fluid hole 1231 facilitating fluid flow is formed in the valve body fixing member 123, and the second fluid hole 1231 is communicated with the first fluid hole 1223;
one end of the elastic member 121 is connected to the support unit 112, and the other end is connected to the valve body lower end face 1222 of the valve body 122, so that the valve body upper end face 1221 of the valve body 122 is connected to the valve body fixing member 123; the valve body fixing member 123 is fixedly and hermetically connected with the fluid cavity 111;
referring to fig. 3, when the valve body lower end 1222 of the valve body 122 is subjected to the pressure of the fluid, the valve body 122 is subjected to the upward elastic force of the compression spring and the upward pressure of the hydraulic oil, so that the valve body upper end 1221 is hermetically connected to the valve body fixing member 123, the fluid groove 1224 is further stopped, and the fluid flows out through the first fluid hole 1223 and the second fluid hole 1231 in sequence, so as to form a pressure difference and form a damping force; when the valve body upper end surface 1221 of the valve body 122 is subjected to the pressure of the fluid, the valve body 122 is subjected to the downward pressure of the hydraulic oil and overcomes the upward elastic force of the compression spring, so that the valve body upper end surface 1221 of the valve body 122 is separated from the valve body fixing member 123, and the fluid flows in from the second fluid holes 1231 and the fluid grooves 1224, respectively, after passing through the first fluid holes 1223.
The working principle can be understood as follows: referring to fig. 5 and 6, the end surface of the valve body holder 123 includes a hole portion 1232 and a valve body holder body portion 1233, and the projection surface of the fluid tank 1224 is on the valve body holder body portion 1233. That is, the projection surface of the fluid groove 1224 projected on the end surface of the valve element fixing member 123 does not overlap with the hole 1232 and does not intersect therewith.
The cross section of the second fluid hole 1231 is an inner hexagon, an external thread is arranged on the outer side of the valve body fixing member 123, an internal thread is arranged in the fluid cavity 111, and the valve body fixing member 123 is in threaded sealing connection with the fluid cavity 111.
Referring to fig. 7, the fluid slots 1224 are 2, 3 or 4 slots and are uniformly disposed around the valve body 122.
Preferably, referring to fig. 2, the supporting unit 112 is a supporting eave, and the diameter of the fluid cavity 111 above the supporting eave is larger than the diameter of the fluid cavity 111 below the supporting eave.
Referring to fig. 1, 3 and 4, the piston valve 120 further includes an elastic element fixing member 124 for fixing the elastic element 121, a lower end of the elastic element fixing member 124 is connected to the supporting ledge in a sealing manner, for the elastic element fixing member 124, an accommodating chamber 1241 with an open upper end and a third fluid hole 1242 communicated with the accommodating chamber 1241 are disposed on the elastic element fixing member 124, the accommodating chamber 1241 is matched with a lower end of the elastic element 121, the third fluid hole 1242 is communicated with the first fluid hole 1223 through the accommodating chamber 1241, a cross-sectional area of the third fluid hole 1242 is smaller than a sum of cross-sectional areas of the plurality of fourth fluid holes 115, and when the front fork 300 moves downward, hydraulic oil in the bottom cylinder 200 is compressed, the hydraulic oil in the bottom cylinder 200 flows into the fluid chamber 111 through the fourth fluid holes 115 and is ejected through the third fluid hole 1242, the first fluid hole 1223 and the second fluid hole 1231 in sequence, because the sectional area of the third fluid hole 1242 is smaller than the sum of the sectional areas of the plurality of fourth fluid holes 115, hydraulic oil forms a pressure difference in the third fluid hole 1242 to generate a damping force, thereby playing a role in shock absorption and buffering, and if the elastic element fixing member 124 is removed, when a moving motorcycle encounters a large ditch or pit, the front fork 300 suddenly moves downwards, and the impact force is large, at this time, the hydraulic oil in the bottom cylinder 200 suddenly compresses to enter the fluid cavity 111 through the plurality of fourth fluid holes 115, at this time, the sectional area of the first fluid hole 1223 on the valve body 122 is small, the lower end surface 1222 of the valve body is subjected to a very large impact force, the valve body 122 is easily damaged, and the elastic element 121 is easily deformed due to the large impact force; in order to solve the above problems, the elastic element fixing member 124 is designed, when the elastic element 121 is supported and protected first, so as to reduce the impact force of the hydraulic oil directly impacting the elastic element 121, by providing the third fluid hole 1242, the hydraulic oil impacts the bottom of the elastic element fixing member 124 and is sprayed into the accommodating cavity 1241 through the third fluid hole 1242, the hydraulic oil passing through the third fluid hole 1242 mainly impacts the middle position of the lower end surface 1222 of the valve body, so as to form a pressure difference, so as to generate a damping force, and the impact force on the elastic element 121 is also reduced; and a plurality of pins 1225 for preventing the elastic element 121 from sliding on the valve body 122 are circumferentially arranged on the lower end surface 1222 of the valve body along the first fluid hole 1223, so that the hydraulic oil sprayed from the third fluid hole 1242 directly impacts the pins 1225 and the first fluid hole 1223, the hydraulic oil is dispersed through the pins 1225, and the impact force of the sprayed hydraulic oil is also dispersed, thereby greatly reducing the impact on the lower end surface 1222 of the valve body and avoiding the damage of the valve body 122. The elastic element 121 is a compression spring with gradually increasing pitch, i.e. a horn-type compression spring; the pins 1225 are inserted into the compression spring from one end of the trumpet-shaped compression spring with a small pitch, one end of the trumpet-shaped compression spring with a large pitch is in supporting connection with the bottom of the accommodating cavity 1241 to fix the compression spring and prevent the compression spring from shifting, the best mode is that the surface of the pins 1225, which is in contact with the elastic element 121, is an arc-shaped surface, each pin 1225 is inserted into the compression spring from one end of the compression spring with a small pitch, and the arc-shaped surface of the pins 1225 is matched and fixed with the compression spring; and one end of the compression spring with a large pitch is matched with the diameter of the bottom of the accommodating cavity 1241, and the one end of the compression spring with a large pitch is clamped at the bottom of the accommodating cavity 1241.
In a preferred mode, the cross-sectional diameter of the fluid chamber 111 in the piston rod 110 is 20mm, and the cross-sectional diameter of the first fluid hole 1223 in the valve body 122 is 3mm, that is, the cross-sectional diameter ratio of the fluid chamber 111 to the first fluid hole 1223 is 20.
Referring to fig. 8, a shock absorber includes a piston 100, a bottom tube 200 and a front fork 300, the piston 100 includes a piston rod 110 and a piston valve 120 generating a damping force, one end of the piston rod 110 is a piston end 113, the other end is a fixed end 114, the fixed end 114 is fixedly connected with the bottom of the bottom tube 200, the front fork 300 is connected with the bottom tube 200 in a sliding and sealing manner, and the piston end 113 extends into the front fork 300 and is connected with the front fork 300 in a sliding and sealing manner.
When a motorcycle with large displacement or large load suddenly passes through a pit or a ditch, the front fork 300 of the shock absorber moves downwards to compress hydraulic oil in the bottom cylinder 200, so that hydraulic oil in a cavity formed by the lower end of the front fork 300, the inner wall of the bottom cylinder 200 and the outer wall of the piston rod 110 is compressed and enters the fluid cavity 111 through the fourth fluid hole 115 to form a first damping force, the hydraulic oil entering the fluid cavity 111 forms a pressure difference at the third fluid hole 1242 to generate a second damping force, the hydraulic oil enters the accommodating cavity 1241 and enters the cavity of the front fork 300 through the first fluid hole 1223 to form a pressure difference to generate a third damping force, at this moment, when the lower end face 1222 of the valve body 122 of the valve body is subjected to the pressure of the fluid, the upper end face 1221 of the valve body is in sealing connection with the valve body 123 by the upward elastic force of the compression spring and the upward pressure of the hydraulic oil, so that the fluid groove is stopped and flows out through the first fluid hole 1223 to form a pressure difference to generate a third damping force; after three times of damping force, the front fork tube 300 is ensured not to impact the bottom of the bottom cylinder 200 when the motorcycle with large displacement or large load capacity suddenly sinks or ditches; and the shock absorber can play a role in buffering and damping, the safety and comfort of riding personnel are ensured, and the damage to the shock absorber is avoided.
Through having installed piston valve 120 additional, solved the condition of touching the end completely, when the motorcycle was through very abominable roadside, very light passing through can not produce adverse reactions such as resonance abnormal sound, and comfortable type is better, and stability is better, and the controllability of whole car is lighter.
When rebounding, the front fork 300 of the shock absorber moves upwards, hydraulic oil in the cavity of the front fork 300 flows into the fluid cavity 111 through the piston valve, at this time, when the valve body upper end surface 1221 of the valve body 122 is subjected to the pressure of fluid, the valve body 122 is subjected to the downward pressure of the hydraulic oil and overcomes the upward elastic force of the compression spring, so that the valve body upper end surface 1221 of the valve body 122 is separated from the valve body fixing member 123, the fluid flows into the fluid cavity 111 from the second fluid hole 1231 and the fluid groove 1224 after passing through the first fluid hole 1223, and flows into the cavity formed by the lower end of the front fork 300, the inner wall of the bottom cylinder 200 and the outer wall of the piston rod 110 through the damping hole 116 and the fourth fluid hole 115.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A piston for a shock absorber, characterized in that the piston (100) comprises
The piston rod (110), a fluid cavity (111) is arranged in the piston rod (110), and one end of the piston rod (110) is a piston end (113);
and a piston valve (120) generating a damping force, the piston valve (120) being fixed within the fluid chamber (111) of the piston end (113);
the piston valve (120) separates a fluid chamber (111) into an upper fluid chamber (1111) and a lower fluid chamber (1112), and generates a damping force according to a pressure difference between the upper fluid chamber (1111) and the lower fluid chamber (1112);
a support unit (112) is arranged on the fluid cavity (111);
the piston valve (120) comprises an elastic element (121), a valve body (122) and a valve body fixing piece (123),
the valve body (122) comprises an upper end face (1221) and a lower end face (1222), a first fluid hole (1223) facilitating fluid flow is formed in the valve body (122), the first fluid hole (1223) penetrates through the upper end face (1221) and the lower end face (1222) of the valve body, and fluid grooves (1224) facilitating fluid flow are formed in the periphery of the valve body (122);
the valve body fixing piece (123) is provided with a second fluid hole (1231) facilitating fluid flow, and the second fluid hole (1231) is communicated with the first fluid hole (1223);
one end of the elastic element (121) is connected with the supporting unit (112), and the other end of the elastic element is connected with the lower end face (1222) of the valve body (122), so that the upper end face (1221) of the valve body (122) is connected with the valve body fixing piece (123); the valve body fixing piece (123) is fixedly and hermetically connected with the fluid cavity (111);
when the lower valve body end face (1222) of the valve body (122) is subjected to the pressure of the fluid, the upper valve body end face (1221) is in sealing connection with the valve body fixing piece (123), so that the fluid groove (1224) is cut off, and the fluid flows out through the first fluid hole (1223) and the second fluid hole (1231) in sequence; when the valve body upper end surface (1221) of the valve body (122) is subjected to the pressure of fluid, the valve body upper end surface (1221) is separated from the valve body fixing piece (123), and the fluid flows in from the second fluid hole (1231) and the fluid groove (1224) respectively after passing through the first fluid hole (1223).
2. The piston for a shock absorber according to claim 1, wherein the end surface of said valve body holder (123) includes a hole portion (1232) and a valve body holder body portion (1233), and a projected surface of said fluid groove (1224) is on the valve body holder body portion (1233).
3. The piston for a shock absorber according to claim 1, wherein the support unit (112) is a support ledge, and the diameter of the fluid chamber (111) above the support ledge is larger than the diameter of the fluid chamber (111) below the support ledge.
4. A piston for a shock absorber according to claim 3, wherein the piston valve (120) further comprises an elastic member fixing member (124) for fixing the elastic member (121), and a lower end of the elastic member fixing member (124) is sealingly connected to the supporting ledge.
5. A piston for a shock absorber according to claim 4, wherein the elastic member fixing member (124) is provided with a receiving chamber (1241) opened at an upper end and a third fluid hole (1242) communicating with the receiving chamber (1241), the receiving chamber (1241) is fitted to a lower end of the elastic member (121), and the third fluid hole (1242) communicates with the first fluid hole (1223) through the receiving chamber (1241).
6. A piston for a shock absorber according to claim 1, wherein said elastic member (121) is a compression spring having a gradually increasing pitch.
7. A piston for shock absorbers according to claim 6, characterized in that said valve body lower end surface (1222) is provided with a plurality of pins (1225) for preventing the elastic element (121) from sliding on the valve body (122).
8. A piston for shock absorber as claimed in claim 7, wherein the face of said leg (1225) contacting the resilient member (121) is an arc face, and each of said legs (1225) is extended from the end of the compression spring having a smaller pitch, and the arc face of the leg (1225) is fitted and fixed to the compression spring.
9. A shock absorber, comprising a piston (100) according to any one of claims 1 to 8, a base cylinder (200) and a front fork (300), one end of the front fork (300) extending into the base cylinder (200) and being in sliding sealing connection with the base cylinder (200); one end of the piston (100) is fixed with the bottom of the bottom cylinder (200), and the other end of the piston extends into the front fork tube (300) and is connected with the front fork tube (300) in a sliding and sealing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111078845.9A CN113757293B (en) | 2021-09-15 | 2021-09-15 | Piston for shock absorber and shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111078845.9A CN113757293B (en) | 2021-09-15 | 2021-09-15 | Piston for shock absorber and shock absorber |
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| Publication Number | Publication Date |
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| CN113757293A CN113757293A (en) | 2021-12-07 |
| CN113757293B true CN113757293B (en) | 2022-12-27 |
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| CN202111078845.9A Active CN113757293B (en) | 2021-09-15 | 2021-09-15 | Piston for shock absorber and shock absorber |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0173020A2 (en) * | 1984-06-28 | 1986-03-05 | Stephen W. Simons | Motorcycle front fork anti-cavity damping system |
| JPH1113822A (en) * | 1997-06-23 | 1999-01-22 | Kowa Seisakusho:Kk | Front fork |
| CN2727036Y (en) * | 2004-08-25 | 2005-09-21 | 重庆宗申技术开发研究有限公司 | Front shock absorber of motorcycle |
| CN100431909C (en) * | 2007-07-05 | 2008-11-12 | 重庆渝安创新科技(集团)有限公司 | Front set absorber for motorcycle |
| CN104455184A (en) * | 2014-11-24 | 2015-03-25 | 重庆市亮影工贸有限公司 | Motorcycle inversed type front damper |
| CN208605539U (en) * | 2018-06-21 | 2019-03-15 | 株洲三华车用部件有限公司 | A kind of front vibration damper of motorcycle and motorcycle |
| CN213928958U (en) * | 2020-10-29 | 2021-08-10 | 上海拿森汽车电子有限公司 | Unequal flow limiting valve |
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2021
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