Brake valve for agricultural machine engine

Abstract

The utility model provides a brake valve for an agricultural machine engine, and belongs to the technical field of vehicle accessories. The problem that an existing brake valve for an agricultural machine engine is poor in adaptability is solved. The brake valve for the agricultural machine engine comprises a shell, a coil, a movable iron core, a valve rod and a piston body, the outer end of the piston body is provided with an axially-penetrating oil inlet hole, a circle of oil outlet holes and a circle of oil return holes are formed in the piston body in a radial penetrating mode, and a first sealing ring, a second sealing ring and a third sealing ring are sequentially embedded in the outer wall of the piston body from outside to inside; the piston body is provided with a circle of protruding ring protruding out of the inner wall of the oil inlet hole in the radial direction, a first steel ball and a second steel ball are arranged in the oil inlet hole, and a push rod is arranged in the protruding ring. The outer end of the protruding ring is provided with a first sealing face for blocking the first steel ball, the inner end of the protruding ring is provided with a second sealing face for blocking the second steel ball, and a blocking piece is arranged at the outer end of the piston body. The utility model has the advantages of good adaptability and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle accessories and relates to a brake valve, in particular to a brake valve for an agricultural machinery engine. Background Art

[0002] Agricultural machinery refers to agricultural machinery, including agricultural tractors, agricultural harvesters, agricultural rotary tillers, etc. Brake valves are installed in the engines of agricultural machinery. The brake valves are mainly used to adjust and control the hydraulic pressure in the braking system to ensure that the agricultural machinery can brake effectively.

[0003] The existing brake valve for agricultural machinery engines includes a shell and a piston body. The shell and the piston body are fixedly connected. A coil and a moving iron core are arranged in the shell. The end of the piston body is an oil inlet. The side of the piston body is radially penetrated by an oil outlet. A slider is arranged in the piston body. The moving iron core is connected to the slider through a valve stem.

[0004] When the existing brake valve for agricultural machinery engines is in use, the valve stem drives the slider to move axially in the piston body, blocking the oil outlet or connecting the oil outlet to the oil inlet, thereby realizing the on-off of oil outlet, and the return oil is sprayed out from the cylinder. However, in order to have a compact structure and a stable connection, a hydraulic module is currently required in the agricultural machinery engine, and an oil outlet chamber and an oil return chamber are set on the hydraulic module, and the existing brake valve for agricultural machinery engines cannot be adapted. Summary of the invention

[0005] The utility model aims to provide a brake valve for an agricultural machinery engine with good adaptability in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a brake valve for an agricultural machinery engine, comprising a shell, a coil, a moving iron core, a valve stem and a piston body, the inner end of the piston body is fixedly connected to the shell, the outer end of the piston body is an axially penetrating oil inlet hole, characterized in that the piston body is radially penetrated by a circle of oil outlet holes and a circle of oil return holes, the outer wall of the piston body is sequentially embedded with a sealing ring 1, a sealing ring 2 and a sealing ring 3 from the outside to the inside, the oil outlet hole is located between the sealing ring 1 and the sealing ring 2, and the oil return hole is located between the sealing ring 2 and the sealing ring 3, the piston body has a circle of convex rings radially protruding from the inner wall of the oil inlet hole, the oil outlet hole radially penetrates the convex ring, the oil inlet hole is provided with a steel ball 1 between the convex ring and the outer end of the piston body, the oil inlet hole is also provided with a steel ball 2 between the convex ring and the valve stem, the convex ring is provided with a push rod, the outer end of the convex ring has a sealing surface 1 for blocking the steel ball 1 and the inner end of the convex ring has a sealing surface 2 for blocking the steel ball 2, and the outer end of the piston body is provided with a blocking member for blocking the steel ball 1.

[0007] In the above-mentioned brake valve for agricultural machinery engines, the inner wall of the oil inlet hole has a plurality of guide ribs 1 that are evenly distributed circumferentially and extend axially, and the steel balls 1 are supported by each guide rib 1, and the inner wall of the oil inlet hole has a plurality of guide ribs 2 that are evenly distributed circumferentially and extend axially, and the steel balls 2 are supported by each guide rib 2.

[0008] In the above-mentioned brake valve for agricultural machinery engine, the outer wall of the push rod near the two sides of the steel ball has a plurality of support ribs evenly distributed circumferentially and extending axially to the middle of the outer wall of the push rod, and each support rib abuts against the inner wall of the oil inlet hole.

[0009] In the above-mentioned brake valve for agricultural machinery engine, the blocking member is a fastening pin radially penetrating the outer end of the piston body.

[0010] In the above-mentioned brake valve for agricultural machinery engines, the inner end of the outer shell has an inwardly folded rib, and the inner end of the outer shell also has outwardly folded and symmetrically arranged connecting edges, the two connecting edges have penetrating connecting holes, the inner end of the piston body has an outwardly folded flange, and the outer shell is provided with a fixing seat for the flange to be embedded, the flange is located between the rib and the fixing seat and is blocked by the rib, and a sealing ring four is embedded in the outer wall of the flange.

[0011] In the above-mentioned brake valve for agricultural machinery engine, the back side of the fixed seat facing away from the piston body has a cylindrical connecting column, the valve stem axially passes through the connecting column, the connecting column is riveted with a mounting sleeve, the moving iron core is located in the mounting sleeve, the connecting column is embedded with a sealing ring 5 sealed to the mounting sleeve, the coil is sleeved on the mounting sleeve and covered by an outer shell, the outer end of the outer shell is riveted with a rear cover, the mounting sleeve extends out of the rear cover, and the rear cover is embedded with a sealing ring 6 sealed to the mounting sleeve.

[0012] Compared with the prior art, the brake valve for the agricultural machinery engine has good adaptability, compact structure, low manufacturing cost and high yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of a brake valve for an agricultural machinery engine.

[0014] Figure 2 It is a structural sectional view of a brake valve for an agricultural machinery engine.

[0015] Figure 3 The present invention is a three-dimensional structural diagram of a push rod in a brake valve for an agricultural machinery engine.

[0016] In the figure, 1, housing; 2, coil; 3, moving iron core; 4, valve stem; 5, piston body; 51, convex ring; 6, oil inlet hole; 7, oil outlet hole; 8, oil return hole; 9, sealing ring one; 10, sealing ring two; 11, sealing ring three; 12, steel ball one; 13, steel ball two; 14, push rod; 141, supporting rib; 15, blocking member; 16, guide rib one; 17, guide rib two; 18, retaining edge; 19, connecting edge; 20, connecting hole; 21, flange; 22, fixing seat; 221, connecting column; 23, sealing ring four; 24, mounting sleeve; 25, sealing ring five; 26, back cover; 27, sealing ring six. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1 , Figure 2 and Figure 3 As shown, the brake valve for the agricultural machinery engine comprises a housing 1, a coil 2, a moving iron core 3, a valve stem 4 and a piston body 5. The inner end of the piston body 5 is fixedly connected to the housing 1, the outer end of the piston body 5 is an axially penetrating oil inlet hole 6, the piston body 5 is radially penetrated by a circle of oil outlet holes 7 and a circle of oil return holes 8, the outer wall of the piston body 5 is sequentially embedded with a sealing ring 1 9, a sealing ring 2 10 and a sealing ring 3 11 from the outside to the inside, the oil outlet hole 7 is located between the sealing ring 1 9 and the sealing ring 2 10, the oil return hole 8 is located between the sealing ring 2 10 and the sealing ring 3 11, and the piston body 5 has a convex ring 51 radially protruding from the inner wall of the oil inlet hole 6, the oil outlet hole 7 radially penetrates the convex ring 51, the oil inlet hole 6 is provided with a steel ball 12 located between the convex ring 51 and the outer end of the piston body 5, the oil inlet hole 6 is also provided with a steel ball 13 located between the convex ring 51 and the valve stem 4, the convex ring 51 is provided with a push rod 14, the outer end of the convex ring 51 has a sealing surface 1 for blocking the steel ball 12, and the inner end of the convex ring 51 has a sealing surface 2 for blocking the steel ball 13, and the outer end of the piston body 5 is provided with a blocking member 15 for blocking the steel ball 12.

[0019] The piston body 5 in the brake valve for the agricultural machinery engine is used to insert into the hydraulic module, the oil outlet hole 7 is connected to the oil outlet chamber of the hydraulic module, and the oil return hole 8 is connected to the oil return chamber of the hydraulic module. This has good adaptability, compact structure, low manufacturing cost and high yield. During use, when oil needs to be discharged, the moving iron core 3 drives the valve stem 4 to contact the steel ball 2 13, and the steel ball 2 13 is blocked on the sealing surface 2. At this time, the steel ball 2 13 hits the push rod 14 and makes the push rod 14 hit the steel ball 12, the steel ball 12 is separated from the sealing surface 1, the oil inlet hole 6 and the oil outlet hole 7 are connected to discharge oil, the steel ball 2 13 plays a blocking role, and the oil return hole 8 does not work; when the oil needs to be returned, the moving iron core 3 is displaced to the side away from the steel ball 2 13, the pressure of the oil inlet hole 6 makes the steel ball 12 sealed on the sealing surface 1, the steel ball 12 hits the push rod 14 and makes the push rod 14 hit the steel ball 2 13, the steel ball 2 13 is separated from the sealing surface 2, the oil outlet hole 7 is connected to the oil return hole 8, so as to return the oil.

[0020] The inner wall of the oil inlet hole 6 has four circumferentially evenly distributed and axially extended guide ribs 16, and the steel ball 12 is supported by each guide rib 16. The inner wall of the oil inlet hole 6 has four circumferentially evenly distributed and axially extended guide ribs 2 17, and the steel ball 2 13 is supported by each guide rib 2 17. In this way, the axial displacement of the steel ball 12 and the steel ball 2 13 is smooth, and the working stability is good.

[0021] The outer wall of the push rod 14 near the second steel ball 13 has three support ribs 141 evenly distributed in the circumferential direction and extending axially to the middle of the outer wall of the push rod 14, and each support rib 141 abuts against the inner wall of the oil inlet hole 6. In this way, the push rod 14 has smooth axial displacement, and the support rib 141 is close to the second steel ball 13, so that it will not interfere with the oil return of the oil outlet hole 7, and the oil return process is smooth.

[0022] The blocking member 15 is a fastening pin that radially penetrates the outer end of the piston body 5. This structure is simple, the steel ball 12 is located between the fastening pin and the convex ring 51, and the fastening pin is inserted into the piston body 5 with an interference fit, and the fastening pin plays a blocking role to prevent the steel ball 12 from falling off.

[0023] The inner end of the housing 1 has an inwardly folded rib 18, and the inner end of the housing 1 also has an outwardly folded and symmetrically arranged connecting rib 19, and the two connecting ribs 19 have penetrating connecting holes 20, and the inner end of the piston body 5 has an outwardly folded flange 21, and the housing 1 is provided with a fixing seat 22 for the flange 21 to be embedded, and the flange 21 is located between the flange 18 and the fixing seat 22 and is blocked by the flange 18, and a sealing ring 23 is embedded in the outer wall of the flange 21. In this way, the piston body 5 and the housing 1 are firmly connected and have good sealing performance.

[0024] The back side of the fixing seat 22 facing away from the piston body 5 has a cylindrical connecting column 221, the valve stem 4 axially penetrates the connecting column 221, the connecting column 221 is riveted with a mounting sleeve 24, the mounting sleeve 24 is for the connecting column 221 to be inserted, and the edge of the mounting sleeve 24 is riveted inwardly to the annular groove on the outer wall of the connecting column 221, the moving iron core 3 is located in the mounting sleeve 24, the connecting column 221 is embedded with a sealing ring 5 25 sealed in the mounting sleeve 24, the coil 2 is sleeved on the mounting sleeve 24 and is covered by the outer shell 1, the outer end of the outer shell 1 is riveted with a rear cover 26, the inner wall of the outer shell 1 has a step surface that abuts against the rear cover 26, the outer end edge of the rear cover 26 is chamfered, the outer end of the outer shell 1 is riveted inwardly to the chamfer of the rear cover 26, the mounting sleeve 24 extends out of the rear cover 26, and the rear cover 26 is embedded with a sealing ring 6 27 sealed in the mounting sleeve 24. The mounting sleeve 24 facilitates the installation of the moving iron core 3 and also ensures the structural strength. The rear cover 26 and the housing 1 are riveted to ensure high structural strength. The sealing ring 5 25 and the sealing ring 6 27 ensure sealing and long service life.

[0025] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The specific embodiments described in this article are only used to illustrate the spirit of the utility model. The technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar way, but they will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A brake valve for an agricultural machinery engine, comprising a housing (1), a coil (2), a moving iron core (3), a valve stem (4) and a piston body (5), wherein the inner end of the piston body (5) is fixedly connected to the housing (1), and the outer end of the piston body (5) is an axially penetrating oil inlet hole (6), characterized in that: The piston body (5) is radially penetrated by a circle of oil outlet holes (7) and a circle of oil return holes (8); the outer wall of the piston body (5) is sequentially embedded with a sealing ring (9), a sealing ring (10) and a sealing ring (11) from the outside to the inside; the oil outlet hole (7) is located between the sealing ring (9) and the sealing ring (10); the oil return hole (8) is located between the sealing ring (10) and the sealing ring (11); the piston body (5) has a circle of convex rings (51) radially protruding from the inner wall of the oil inlet hole (6); the oil outlet hole (7) radially penetrates the convex ring (51); The oil inlet hole (6) is provided with a steel ball one (12) located between the convex ring (51) and the outer end of the piston body (5), and the oil inlet hole (6) is also provided with a steel ball two (13) located between the convex ring (51) and the valve stem (4). The convex ring (51) is provided with a push rod (14). The outer end of the convex ring (51) has a sealing surface one for sealing with the steel ball one (12), and the inner end of the convex ring (51) has a sealing surface two for sealing with the steel ball two (13). The outer end of the piston body (5) is provided with a blocking member (15) for blocking the steel ball one (12).

2. The brake valve for an agricultural machinery engine according to claim 1, characterized in that: The inner wall of the oil inlet hole (6) has a plurality of guide ribs (16) uniformly distributed in the circumferential direction and extending in the axial direction, and the steel balls (12) are supported by the guide ribs (16). The inner wall of the oil inlet hole (6) has a plurality of guide ribs (17) uniformly distributed in the circumferential direction and extending in the axial direction, and the steel balls (13) are supported by the guide ribs (17).

3. The brake valve for an agricultural machinery engine according to claim 2, characterized in that: The outer wall of the push rod (14) close to the two sides of the steel ball (13) has a plurality of support ribs (141) evenly distributed in the circumferential direction and extending axially to the middle of the outer wall of the push rod (14), and each support rib (141) abuts against the inner wall of the oil inlet hole (6).

4. The brake valve for an agricultural machinery engine according to claim 3, characterized in that: The blocking member (15) is a fastening pin that radially penetrates the outer end of the piston body (5).

5. The brake valve for an agricultural machine engine according to claim 4, characterized in that: The inner end of the shell (1) has an inwardly folded retaining edge (18), and the inner end of the shell (1) also has outwardly folded and symmetrically arranged connecting edges (19), the two connecting edges (19) have connecting holes (20) extending therethrough, the inner end of the piston body (5) has an outwardly folded flange (21), and the shell (1) is provided with a fixing seat (22) for the flange (21) to be embedded, the flange (21) is located between the retaining edge (18) and the fixing seat (22) and is blocked by the retaining edge (18), and a sealing ring (23) is embedded in the outer wall of the flange (21).

6. The brake valve for an agricultural machine engine according to claim 5, characterized in that: The fixing seat (22) has a cylindrical connecting column (221) on the back side facing away from the piston body (5), the valve stem (4) axially penetrates the connecting column (221), the connecting column (221) is riveted with a mounting sleeve (24), the moving iron core (3) is located in the mounting sleeve (24), the connecting column (221) is embedded with a sealing ring (25) that is sealed to the mounting sleeve (24), the coil (2) is sleeved on the mounting sleeve (24) and is covered by the outer shell (1), the outer end of the outer shell (1) is riveted with a rear cover (26), the mounting sleeve (24) extends out of the rear cover (26), and the rear cover (26) is embedded with a sealing ring (27) that is sealed to the mounting sleeve (24).

Images