CN212555826U - Fuel tank cap for agricultural vehicle - Google Patents

Abstract

The utility model relates to an oil tank cover for agricultural vehicles, which comprises an oil tank cover lower body, wherein the oil tank cover lower body is arranged in a cylindrical shape, the outer side wall of the oil tank cover lower body is provided with external threads, and one end of the oil tank cover lower body is buckled with an oil tank cover upper body; one end of the lower body of the oil tank cover, which is far away from the upper body of the oil tank cover, is fixedly connected with a baffle plate which is arranged for covering the end face of the lower body of the oil tank cover, a through hole is arranged on the baffle plate, a breather cylinder is fixedly connected at the position of the baffle plate, which is close to the through hole, an upper body of a breather valve is slidably connected in the breather cylinder, which is arranged along the length direction of the breather cylinder, one end of the upper body of the breather valve, which is close to the upper body of the oil tank cover, is fixedly connected with a breather valve cover, the central axis of which is superposed along the central axis of the upper body of the breather valve; the utility model discloses have when the inside and outside atmospheric pressure of oil tank is different, the inside and outside atmospheric pressure of balanced oil tank reduces the effect of the inside and outside pressure differential of oil tank.

Description

Fuel tank cap for agricultural vehicle

Technical Field

The utility model belongs to the technical field of the technique of fuel tank access cover and specifically relates to a fuel tank cap for agricultural vehicle is related to.

Background

At present, agricultural vehicles such as tractors and the like are vehicles which are often required to be put into practical use in rural areas, the vehicles are usually powered by diesel oil or gasoline, and are all provided with oil tanks, the oil tanks of the vehicles are usually similar to motorcycles, the oil tanks are all provided with detachable oil tank covers, and the oil tank covers are connected with the oil tanks through external threads to realize the closing and opening operations of the oil tanks.

In the prior art, reference may be made to a chinese utility model patent with an authorization publication number of CN202321108U, which discloses an anti-spill oil tank cover, comprising an outer cover and an inner cover, wherein an anti-spill oil assembly is arranged in a space enclosed by the outer cover and the inner cover, and the anti-spill oil assembly is composed of a bracket, a steel ball, a movable block and a baffle; when the oil tank inclines, the steel ball rolls under the action of gravity, and when the steel ball rolls, the movable block is pushed to move to seal the vent hole, so that fuel oil is prevented from overflowing outwards from the vent hole.

The above prior art solutions have the following drawbacks: although above-mentioned technical scheme can prevent the oil leak, in daily life, the inside can be because of weather reason or oil burning reason and the temperature is higher in general oil tank, and then inside atmospheric pressure grow, and the inside atmospheric pressure of grow can upwards push away the movable block to block the air vent, atmospheric pressure in the oil tank is difficult to release this moment, then appears the fuel blowout phenomenon easily when opening the fuel tank cap, and the security is lower.

SUMMERY OF THE UTILITY MODEL

To the not enough that prior art exists, one of the purposes of the utility model is to provide an oil tank cap for agricultural vehicle.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

an oil tank cover for agricultural vehicles comprises a lower body of the oil tank cover, wherein the lower body of the oil tank cover is arranged in a cylindrical shape, the outer side wall of the lower body of the oil tank cover is provided with external threads, and one end of the lower body of the oil tank cover is buckled with an upper body of the oil tank cover;

one end of the lower body of the oil tank cover, which is far away from the upper body of the oil tank cover, is fixedly connected with a baffle plate which is arranged on the end surface of the lower body of the oil tank cover and covers the lower body of the oil tank cover, a through hole is arranged on the baffle plate, a ventilation cylinder with the outer diameter equal to the aperture of the through hole is fixedly connected at the position of the baffle plate, which is close to the through hole;

the oil tank cover is characterized in that a vent valve upper body arranged along the length direction of the vent cylinder is connected in the vent cylinder in a sliding manner, the vent valve upper body can slide along the length direction of the vent cylinder, one end, close to the oil tank cover upper body, of the vent valve upper body is fixedly connected with a vent valve cover of which the central axis is superposed along the central axis of the vent valve upper body, the vent valve cover is positioned on the outer side of one end, close to the oil tank cover upper body, of the vent cylinder, and the vent valve cover can cover one end, close to the oil tank cover upper;

the vent pipe is provided with a limiting assembly used for limiting the position of the vent pipe.

By adopting the technical scheme, when in use, the upper oil tank cover body and the lower oil tank cover body are connected, so that the upper oil tank cover body can be used for screwing and disassembling the oil tank cover, the external thread on the lower oil tank cover body can be in threaded connection with the oil inlet hole of the oil tank to seal the oil tank, after the oil tank is sealed, if the air pressure in the oil tank is increased due to temperature rise and is larger than the air pressure outside the oil tank, the upper vent valve body can be slid towards the direction close to the upper oil tank cover body through the limiting component, at the moment, the vent valve cover can be separated from the vent cylinder, at the moment, the air can be released from the oil tank through the gap between the vent cylinder and the upper vent valve body to balance the air pressure inside and outside the oil tank, and when the air pressure inside the oil tank is not higher than the air pressure outside the oil tank, the limiting component can limit the upper vent valve body at the position where the, at this time, the vent valve cover covers the cross section of the vent cylinder, and the gas cannot circulate, so that the sealing effect on the inside of the oil tank is realized.

The present invention may be further configured in a preferred embodiment as: spacing subassembly is including dismantling the spacing spring of connecting in the outer lateral wall of breather valve upper part and keeping away from oil tank cover upper part one end, and the one end that the breather valve upper part was kept away from to spacing spring can be dismantled and connect in the inboard position department that is close to the oil tank cover upper part of the body of breather valve, and when spacing spring was in natural state, breather valve cover and breather pipe terminal surface butt.

Through adopting above-mentioned technical scheme, at ordinary times, spacing spring keeps the natural state, at this moment, the vent valve lid covers the breather pipe terminal surface, it is inside airtight to keep the oil tank, when the inside atmospheric pressure of oil tank is higher, the inside atmospheric pressure of oil tank can jack-up the breather valve, at this moment, spacing spring receives the extrusion, lift the breather valve lid, allow gaseous passing through, the inside and outside atmospheric pressure of balanced oil tank, after the atmospheric pressure of the inside of oil tank resumes normally, spacing spring can reset the breather valve lid again, it is airtight to resume the oil tank again, the oil tank is if slope or inversion this moment, spacing spring also can ensure that the oil in the oil tank can not spill.

The present invention may be further configured in a preferred embodiment as: the outer lateral wall threaded connection of breather valve upper portion has adjusting nut, and the one end butt that the breather section of thick bamboo was kept away from to spacing spring is on adjusting nut is close to the terminal surface of oil tank lid upper portion.

Through adopting above-mentioned technical scheme, adjusting nut's setting can be used for adjusting limiting spring's position, through rotating adjusting nut, can compress the distance between the limiting spring both ends, thereby, limiting spring can keep the state of compressed when the distance between both ends shortens, thereby, increase limiting spring to the reaction force of adjusting nut and breather pipe, thereby, realize through the effect of the demand of adjusting the adjustment nut position adjustment breather valve upper part slip counter-force, through this effect, can be according to the poor adjustment adjusting nut position of atmospheric pressure that probably appears, avoid when pressure differential is not big the breather valve upper part integument to be backed up or when pressure differential is too big the breather valve upper part integument still because the too big and the top of the power of limiting spring does not open.

The present invention may be further configured in a preferred embodiment as: the position of the upper body of the vent valve, which corresponds to the position between the vent valve cover and the baffle plate, is sleeved with a vent rubber ring.

Through adopting above-mentioned technical scheme, the setting up of the rubber ring of ventilating can utilize the strong leakproofness of rubber ring to keep the inside leakproofness of oil tank when the breather valve upper part of the body is not backed down, avoids appearing the gap between breather valve lid and the breather pipe and lets the inside and outside slight gas flow appear under the normal condition of oil tank, the security that the oil tank used when the guarantee oil tank was equipped with oil in.

The present invention may be further configured in a preferred embodiment as: the middle part of the vent valve cover is provided with a one-way valve hole, the middle part of the vent valve upper body is provided with a abdicating hole which penetrates through the vent valve upper body along the length direction of the vent valve upper body, and the aperture of the abdicating hole is larger than that of the one-way valve hole;

the check valve body that sliding connection has the length direction along the breather valve upper body to set up in the check valve hole, the cross-section radius of check valve body is less than the radius of check valve hole, and sliding connection has the check valve core that the diameter is greater than the check valve hole aperture in the hole of stepping down, and the axis of check valve core coincides with the axis of check valve body, and check valve core and check valve body fixed connection are provided with the subassembly that blocks that is used for restricting the check valve body position on the breather valve upper body.

Through adopting above-mentioned technical scheme, when the inside vacuum state that is of oil tank, the inside atmospheric pressure of mailbox is very low, if do not carry out the concora crush operation this moment, can lead to the phenomenon that the oil tank cap is difficult to open, setting through check valve body and check valve core, when the inside atmospheric pressure of oil tank is lower, check valve body can slide to the one end of keeping away from the oil tank cap upper part of the body, thereby open the space between check valve core and the breather valve upper part of the body, let outside air current can flow into inside the oil tank, thereby atmospheric pressure between inside and the outside of balanced oil tank, through blockking the subassembly, can effectively adjust check valve body's position, realize opening check valve body's effect, and effectively avoid when not opening check valve body the inside oil of oil tank entering the condition that overflows even in the oil tank cap via check.

The present invention may be further configured in a preferred embodiment as: the blocking assembly comprises a blocking spring which is detachably connected to the position of the one-way valve body away from the one-way valve core, one end of the blocking spring away from the one-way valve core is detachably connected to the position of the vent valve upper body close to the yielding hole, and when the blocking spring is in a natural state, the one-way valve core is abutted to the vent valve cover.

Through adopting above-mentioned technical scheme, block the spring and daily keep natural state, at this moment, check valve core and breather valve lid butt prevent that the air current from passing through, when outside atmospheric pressure is great, outside atmospheric pressure can promote check valve core and check valve body lapse, opens the space between check valve core and the breather valve lid, lets the air current can follow inside the outside inflow oil tank of oil tank, balanced atmospheric pressure.

The present invention may be further configured in a preferred embodiment as: the position of the one-way valve body, which corresponds to the position between the one-way valve core and the vent valve cover, is sleeved with a one-way valve rubber ring.

Through adopting above-mentioned technical scheme, the setting up of one-way rubber ring can utilize the good seal of rubber ring, keeps the gas tightness under usual between one-way case and breather valve lid to there is not the gas flow between the oil tank is inside and the oil tank outside in the guarantee daily use, thereby the security of guarantee oil tank use.

The present invention may be further configured in a preferred embodiment as: the limiting rod is fixedly connected to the outer side wall of the check valve body and arranged along the length direction of the check valve body, and the side wall of the limiting rod is abutted to the check valve hole.

Through adopting above-mentioned technical scheme, setting up of gag lever post can play stable centering effect to check valve body on the one hand, avoids check valve body to rock and leads to damaging easily or damaging, and simultaneously, the gag lever post also can ensure to have stable space between check valve body and the breather valve lid, and the guarantee air current can get into inside the oil tank.

The present invention may be further configured in a preferred embodiment as: the one end that the ventilation valve upper part of the body kept away from the ventilation valve gap is pegged graft and is had the ventilation valve lower part of the body, and the ventilation hole that runs through the ventilation valve lower part of the body on the length direction of the ventilation valve upper part of the body surface is seted up to the ventilation valve lower part of the body, and the one end fixedly connected with spacing lug of the ventilation valve lower part of the body near the ventilation valve gap, the check valve core can be with spacing lug butt when sliding to the one end of keeping away from the oil tank cover upper part of the body, and the check valve.

Through adopting above-mentioned technical scheme, the setting of the spacing lug on the breather valve lower part of the body can play spacing effect, and the guarantee is when check valve body and check valve core slide, and gliding maximum distance is exactly the position of check valve core and spacing lug butt, reduces check valve body and leads to the unable probability that resets of check valve body and check valve core because the one-way valve hole is deviate from to the excessive slip, and the probability that the condition that the tank cap function became invalid takes place.

The present invention may be further configured in a preferred embodiment as: the one end outside fixedly connected with that the oil tank cap lower part of the body is close to the oil tank cap upper part of the body is the occupation ring of cyclic annular setting, and occupation ring lateral wall can with oil tank cap upper part of the body butt, has seted up a plurality of bleeder vents on the occupation ring.

Through adopting above-mentioned technical scheme, the setting of occupation ring can ensure the stable connection between the oil tank cap upper part of the body and the oil tank cap lower part of the body, and the setting of the bleeder vent on the occupation ring can ensure that external gas can get into the oil tank cap lower part of the body inboard from the oil tank cap lower part of the body outside, realizes the effect that gas flows when the oil tank is inside to need the concora crush.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the automatic balancing device can automatically balance the air pressure difference inside and outside the oil tank when the air pressure inside the oil tank is overlarge, so that the probability of fire or oil splashing caused by the ejection of gas inside the oil tank when the cover is opened is reduced;

2. the probability of the situation that the oil tank cover is difficult to open or the oil tank is damaged by high-pressure extrusion deformation outside the oil tank can be reduced when the pressure is low due to oil use or temperature reduction inside the oil tank;

3. can effectively keep the stability of each structure of fuel tank cap, reduce the probability that the result harmd or became invalid, prolong fuel tank cap's life improves fuel tank cap's stability in use.

Drawings

FIG. 1 is an overall schematic view of the present embodiment;

FIG. 2 is a sectional view showing the inner structure of the lower body of the fuel tank cap in the embodiment;

FIG. 3 is a partial sectional view showing the internal structure of the protruded check valve body in the embodiment;

fig. 4 is a partial cross-sectional view of a protruding connecting post structure of an embodiment.

In the figure, 1, a fuel tank cover upper body; 2. a lower body of the fuel tank cap; 21. a baffle plate; 211. a through hole; 22. a breather tube; 221. a limiting plate; 23. a vent valve upper body; 231. a vent valve cover; 232. a limiting spring; 233. adjusting the nut; 234. a ventilating rubber ring; 24. a check valve body; 241. a one-way valve hole; 242. a hole of abdication; 243. a one-way valve core; 244. a blocking spring; 245. a check valve rubber ring; 246. a limiting rod; 25. a vent valve lower body; 251. a vent hole; 252. a limiting bump; 26. a position occupying ring; 261. a stopper; 262. connecting holes; 263. connecting columns; 264. air holes are formed; 27. an end cap; 271. a vent hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the application discloses an oil tank cap for agricultural vehicle, including the oil tank cap lower part of the body 2, the oil tank cap lower part of the body 2 is the tube-shape setting, has seted up the external screw thread on the oil tank cap lower part of the body 2 lateral wall, and oil tank cap upper part of the body 1 has been detained to oil tank cap lower part of the body 2 one end. When the oil tank is closed, the oil tank cover upper body 1 and the oil tank cover lower body 2 are connected, and the oil tank cover upper body 1 is rotated, so that the oil tank can be stably closed by using the external threads on the oil tank cover lower body 2.

Referring to fig. 1 and 2, a baffle plate 21 covering the end surface of the lower body 2 of the fuel tank cap is fixedly connected to one end of the lower body 2 of the fuel tank cap away from the upper body 1 of the fuel tank cap, and a through hole 211 is formed on the baffle plate 21. A vent tube 22 having an outer diameter equal to the diameter of the through hole 211 is fixedly connected to the baffle plate 21 at a position close to the through hole 211, and the vent tube 22 is disposed along the length direction of the lower body 2 of the tank cap. The provision of the breather 22 enables the flow of gas inside and outside the tank to be maintained, thereby balancing the pressure inside and outside the tank and maintaining the same pressure inside the tank as the pressure outside the tank.

Referring to fig. 1 and 2, a vent valve upper body 23 provided along a longitudinal direction of the vent cylinder 22 is slidably connected to the vent cylinder 22, and a vent valve cover 231 having a central axis overlapping with that of the vent valve upper body 23 is fixedly connected to one end of the vent valve upper body 23 adjacent to the tank cover upper body 1. The vent valve cover 231 is located outside the end of the vent tube 22 close to the tank cap upper body 1, and the vent valve cover 231 can cover the end of the vent tube 22 close to the tank cap upper body 1. A ring-shaped limit plate 221 is fixedly connected to one end of the breather cylinder 22 close to the breather valve cover 231, the inner diameter of the limit plate 221 is as large as the outer diameter of the breather valve upper body 23, and a limit component for limiting the position of the breather cylinder 22 is arranged on the breather cylinder 22. The limiting assembly comprises a limiting spring 232 which is detachably connected to the outer side wall of the upper vent valve body 23 and is far away from one end of the upper oil tank cover body 1, one end, far away from the upper vent valve body 23, of the limiting spring 232 abuts against the surface, far away from the vent valve cover 231, of the limiting plate 221, and when the limiting spring 232 is in a natural state, the vent valve cover 231 abuts against the end face of the vent cylinder 22. At ordinary times, spacing spring 232 keeps the natural state, at this moment, the vent valve lid 231 covers the vent pipe 22 terminal surface, keep the inside airtight of oil tank, when the inside atmospheric pressure of oil tank is higher, the inside atmospheric pressure of oil tank can jack-up the vent valve, at this moment, spacing spring 232 receives the extrusion, lift vent valve lid 231, allow gaseous passing through, the inside and outside atmospheric pressure of balanced oil tank, after the inside atmospheric pressure of oil tank resumes normally, spacing spring 232 can reset vent valve lid 231 again, it is airtight to resume the oil tank again, the oil tank is if slope or inversion this moment, spacing spring 232 also can ensure that the oil in the oil tank can not spill.

Referring to fig. 2 and 3, an adjusting nut 233 is screwed to the outer side wall of the vent valve upper body 23, and one end of the limiting spring 232, which is far from the vent cylinder 22, abuts on the end surface of the adjusting nut 233, which is close to the tank cap upper body 1. Adjusting nut 233's setting can play the effect of adjusting spacing spring 232 effort, twist adjusting nut 233, can compress or loosen spacing spring 232, adjust spacing spring 232 to the effort of breather valve upper part 23 under initial condition, thereby the pressure differential size that needs when adjusting breather valve upper part 23 and breather valve lid 231 and being promoted by atmospheric pressure, and then guarantee daily breather valve upper part 23 can not be opened away because of the gravity of oil when the oil tank inclines and lead to the oil to reveal.

Referring to fig. 2 and 3, a vent rubber ring 234 is sleeved on the vent valve upper body 23 at a position corresponding to the position between the vent valve cover 231 and the baffle plate 21. The arrangement of the ventilation rubber ring 234 can ensure that the ventilation rubber ring 234 is extruded between the limiting plate 221 and the ventilation valve cover 231 under the daily state by utilizing the good tightness of the rubber ring, so that the tightness between the ventilation valve upper body 23 and the ventilation cylinder 22 is kept, and the tightness inside the mailbox in the daily use process is further ensured.

Referring to fig. 2 and 3, an end cap 27 is inserted into one end of the vent cylinder 22 away from the tank cover upper body 1, and a vent hole 271 is formed in the end cap 27. The setting of end cover 27 can effectively reduce the probability that the oil got into breather pipe 22, ensures gaseous circulation simultaneously to reduce the probability that the oil influences the function realization of breather valve body.

Referring to fig. 2 and 3, a one-way valve hole 241 is formed in the middle of the vent valve cover 231, a relief hole 242 formed through the vent valve upper body 23 along the length direction of the vent valve upper body 23 is formed in the middle of the vent valve upper body 23, and the aperture of the relief hole 242 is larger than that of the one-way valve hole 241. The check valve hole 241 is connected with a check valve body 24 arranged along the length direction of the vent valve upper body 23 in a sliding mode, the radius of the section of the check valve body 24 is smaller than that of the check valve hole 241, the abdicating hole 242 is connected with a check valve core 243 with the diameter larger than the aperture of the check valve hole 241 in a sliding mode, and the central axis of the check valve core 243 coincides with the central axis of the check valve body 24. The check valve core 243 is fixedly connected with the check valve body 24, and the vent valve upper body 23 is provided with a blocking component for limiting the position of the check valve body 24. The blocking component comprises a blocking spring 244 abutting against the position where the one-way valve spool 243 is far away from the one-way valve body 24, and one end of the blocking spring 244 far away from the one-way valve spool 243 abuts against the position where the vent valve upper body 23 is close to the abdicating hole 242. When the blocking spring 244 is in the natural state, the check valve body 243 abuts against the vent valve cover 231. When the air pressure in the oil tank is lower than the external air pressure due to oil use, the external air pressure can push the check valve spool 243 to slide in the direction away from the oil tank cover upper body 1, at the moment, the check valve spool 243 and the vent valve cover 231 are far away, gas can be allowed to enter the oil tank, the blocking spring 244 is compressed while the gas is allowed to enter the oil tank, until the pressure balance or the pressure difference between the inside and the outside of the oil tank is not enough to extrude the blocking spring 244, the blocking spring 244 recovers, and the check valve spool 243 and the vent valve cover 231 are kept to seal the inner space of the oil tank, so that the oil is prevented.

Referring to fig. 2 and 3, a check valve rubber ring 245 is sleeved on the check valve body 24 at a position corresponding to a position between the check valve core 243 and the vent valve cover 231. The good tightness of the check valve rubber ring 245 can keep the inside of the mailbox and the outside of the oil tank relatively sealed when the check valve rubber ring 245 is squeezed by the check valve core 243 and the vent valve cover 231, so that the situation that oil leaks when pressure difference does not need to be adjusted daily or the oil tank is dumped is avoided.

Referring to fig. 2 and 3, a stopper 246 provided along the longitudinal direction of the check valve body 24 is fixedly connected to the outer side wall of the check valve body 24, and the side wall of the stopper 246 abuts against the check valve hole 241. The limiting rod 246 can play a role in centering the check valve body 24, so that the probability that the check valve body 24 is damaged or damaged due to the fact that the check valve body 24 is inclined is reduced, and on the other hand, sufficient gap is reserved between the check valve body 24 and the vent valve cover 231 to allow air to pass through.

Referring to fig. 2 and 3, the vent valve lower body 25 is inserted into one end of the vent valve upper body 23 away from the vent valve cover 231, a vent hole 251 penetrating through the vent valve lower body 25 in the length direction of the vent valve upper body 23 is formed in the surface of the vent valve lower body 25, a limiting bump 252 is fixedly connected to one end of the vent valve lower body 25 close to the vent valve cover 231, the limiting bump 252 is disposed in a cylindrical shape, the limiting bump 252 is disposed around the vent hole 251, and the inner diameter of the limiting bump 252 is equal to the aperture of the vent hole 251. The check valve body 24 is positioned in the check valve hole 241 when the check valve body 243 is abutted against the limit projection 252 when sliding toward the end away from the tank cap upper body 1. The arrangement of the vent hole 251 can ensure the circulation of gas, the arrangement of the limiting bump 252 can effectively limit the one-way valve element 243, the maximum sliding distance of the one-way valve element 243 is limited by the limiting bump 252, the probability that the one-way valve body 24 is separated from the one-way valve hole 241 due to the excessive sliding of the one-way valve element 243 and cannot recover the original position from the one-way valve hole 241 can be reduced, and therefore the stability of realizing the function of the one-way valve is maintained.

Referring to fig. 4, the oil tank cover lower part 2 is close to the occupation ring 26 that the one end outside fixedly connected with of the oil tank cover upper part 1 is cyclic annular setting, the occupation ring 26 lateral wall can with the 1 butt of the oil tank cover upper part, a plurality of dogs 261 of position department fixedly connected with of the oil tank cover upper part 1 inside wall corresponding occupation ring 26, all dogs 261 encircle the circumference setting of the oil tank cover upper part 1 inside wall, occupation ring 26 terminal surface can simultaneously with all dogs 261 butts, spacing through occupation ring 26 and dog 261, can detain the oil tank cover upper part 1 on the oil tank cover lower part 2, realize the installation of the oil tank cover upper part 1 and the oil tank cover lower part 2.

Referring to fig. 4, a plurality of connection holes 262 are formed in the occupying ring 26, all the connection holes 262 penetrate through the occupying ring 26 along the central axis direction of the occupying ring 26, all the connection holes 262 are arranged around the occupying ring 26, a connection column 263 arranged along the length direction of the connection holes 262 is fixedly connected to the position of the inner side of the oil tank cover upper body 1 corresponding to the connection holes 262, and when the oil tank cover upper body 1 is buckled to the oil tank cover lower body 2, the connection column 263 is inserted into the connection holes 262. When the upper tank cap body 1 and the lower tank cap body 2 are installed, the connection post 263 and the connection hole 262 are matched to limit the position between the upper tank cap body 1 and the lower tank cap body 2, thereby reducing the probability of the occurrence of the situation that the upper tank cap body 1 and the lower tank cap body 2 rotate relatively to each other to cause the tank cap to be unable to be opened or screwed.

Referring back to fig. 1, the occupying ring 26 is provided with a plurality of air holes 264, all the air holes 264 are disposed around the occupying ring 26, and all the air holes 264 penetrate through the occupying ring 26 along the central axis direction of the occupying ring 26. The air holes 264 can ensure that the air outside the oil tank cover can enter the inner side of the lower body 2 of the oil tank cover, thereby realizing the air pressure balance effect inside and outside the oil tank.

The implementation principle of this embodiment does, when using, screw up the fuel tank cap in the feed inlet position department of oil tank, alright normal use vehicle, when oil tank internal pressure is great, the breather valve upper part 23 slides, realize the outside effect of pushing of the outside row of realization oil tank, when oil tank internal pressure is less, one-way valve body 24 slides, allow external air current to get into the oil tank, the inside and outside pressure of balanced oil tank, thereby keep the inside and outside pressure balance of oil tank, conveniently carry out the oil tank operation, in daily use, under spacing spring 232 and the effect that blocks spring 244, the inside and outside space of oil tank seals, can help preventing the condition appearance such as spill oil.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. The utility model provides an agricultural vehicle is with oil tank cap, includes oil tank cap lower part of the body (2), its characterized in that: the lower body (2) of the oil tank cover is arranged in a cylinder shape, the outer side wall of the lower body (2) of the oil tank cover is provided with external threads, and one end of the lower body (2) of the oil tank cover is buckled with the upper body (1) of the oil tank cover;

one end of the lower body (2) of the oil tank cover, which is far away from the upper body (1) of the oil tank cover, is fixedly connected with a baffle (21) which is arranged on the end surface of the lower body (2) of the oil tank cover, a through hole (211) is arranged on the baffle (21), a vent cylinder (22) with the outer diameter equal to the aperture of the through hole (211) is fixedly connected at the position of the baffle (21) close to the through hole (211), and the vent cylinder (22) is arranged along the length direction of the lower body (2) of;

the ventilation device comprises a ventilation cylinder (22), wherein a ventilation valve upper body (23) arranged along the length direction of the ventilation cylinder (22) is connected in a sliding manner in the ventilation cylinder (22), the ventilation valve upper body (23) can slide along the length direction of the ventilation cylinder (22), one end, close to an oil tank cover upper body (1), of the ventilation valve upper body (23) is fixedly connected with a ventilation valve cover (231) with a central axis coinciding with the central axis of the ventilation valve upper body (23), the ventilation valve cover (231) is located on the outer side of one end, close to the oil tank cover upper body (1), of the ventilation cylinder (22), and the ventilation valve cover (231) can cover one end, close to the oil tank cover upper body (1), of the ventilation cylinder;

the air cylinder (22) is provided with a limiting assembly for limiting the position of the air cylinder (22).

2. The fuel tank cap for an agricultural vehicle according to claim 1, characterized in that: the limiting assembly comprises a limiting spring (232) which is detachably connected to the outer side wall of the upper vent valve body (23) and is far away from one end of the upper fuel tank cover body (1), one end, far away from the upper vent valve body (23), of the limiting spring (232) is detachably connected to the inner side of the vent cylinder (22) and is close to the upper fuel tank cover body (1), and when the limiting spring (232) is in a natural state, the vent valve cover (231) is abutted to the end face of the vent cylinder (22).

3. The fuel tank cap for an agricultural vehicle according to claim 2, characterized in that: the outer side wall of the vent valve upper body (23) is in threaded connection with an adjusting nut (233), and one end, far away from the vent cylinder (22), of the limiting spring (232) abuts against the end face, close to the oil tank cover upper body (1), of the adjusting nut (233).

4. The fuel tank cap for an agricultural vehicle according to claim 1, characterized in that: the upper body (23) of the vent valve is sleeved with a vent rubber ring (234) at the position corresponding to the position between the vent valve cover (231) and the baffle (21).

5. The fuel tank cap for an agricultural vehicle according to claim 1, characterized in that: the middle part of the vent valve cover (231) is provided with a one-way valve hole (241), the middle part of the vent valve upper body (23) is provided with a yielding hole (242) which penetrates through the vent valve upper body (23) along the length direction of the vent valve upper body (23), and the aperture of the yielding hole (242) is larger than that of the one-way valve hole (241);

the check valve body (24) is arranged in the check valve hole (241) in a sliding mode and is arranged along the length direction of the vent valve upper body (23), the radius of the section of the check valve body (24) is smaller than that of the check valve hole (241), the check valve core (243) with the diameter larger than the aperture of the check valve hole (241) is arranged in the abdicating hole (242) in a sliding mode, the central axis of the check valve core (243) coincides with that of the check valve body (24), the check valve core (243) is fixedly connected with the check valve body (24), and the vent valve upper body (23) is provided with a blocking assembly used for limiting the position of the check valve body (24).

6. The fuel tank cap for agricultural vehicles according to claim 4, characterized in that: the blocking assembly comprises a blocking spring (244) which is detachably connected to the position, away from the one-way valve body (24), of the one-way valve core (243), one end, away from the one-way valve core (243), of the blocking spring (244) is detachably connected to the position, close to the abdicating hole (242), of the vent valve upper body (23), and when the blocking spring (244) is in a natural state, the one-way valve core (243) is abutted to the vent valve cover (231).

7. The fuel tank cap for agricultural vehicles according to claim 4, characterized in that: a one-way valve rubber ring (245) is sleeved at the position of the one-way valve body (24) corresponding to the position between the one-way valve core (243) and the ventilation valve cover (231).

8. The fuel tank cap for agricultural vehicles according to claim 4, characterized in that: the limiting rod (246) arranged along the length direction of the check valve body (24) is fixedly connected to the outer side wall of the check valve body (24), and the side wall of the limiting rod (246) is abutted to the check valve hole (241).

9. The fuel tank cap for agricultural vehicles according to claim 4, characterized in that: the one end that ventilation valve upper body (23) kept away from ventilation valve lid (231) is pegged graft and is had ventilation valve lower part of the body (25), ventilation hole (251) that run through ventilation valve lower part of the body (25) on the length direction of ventilation valve upper body (23) is seted up on ventilation valve lower part of the body (25) surface, the one end fixedly connected with limit bump (252) that ventilation valve lower part of the body (25) is close to ventilation valve lid (231), check valve core (243) can be with limit bump (252) butt when sliding to the one end of keeping away from oil tank lid upper body (1), check valve body (24) are located check valve hole (241) when check valve core (243) and limit bump (252) butt.

10. The fuel tank cap for an agricultural vehicle according to claim 1, characterized in that: the one end outside fixedly connected with that the oil tank cap lower part of the body (2) is close to oil tank cap upper part of the body (1) is the position occupying ring (26) of cyclic annular setting, and position occupying ring (26) lateral wall can with oil tank cap upper part of the body (1) butt, has seted up a plurality of bleeder vents (264) on the position occupying ring (26).

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