Rocker brake device, engine system and vehicle

Abstract

The present invention provides a rocker arm brake device, comprising a rocker arm, a roller and a cam, wherein the roller is rotatably connected to one end of the rocker arm; a brake exhaust chamber is provided at the end of the rocker arm away from the roller, a piston column is provided in the brake exhaust chamber, a gap is provided between the top of the piston column and the top of the brake exhaust chamber to form an elastic member chamber, a flow channel connected to the elastic member chamber is provided on the piston column, and a blocking member is provided at the connection between the flow channel and the elastic member chamber; a piston elastic member connected between the top of the brake exhaust chamber and the top of the piston column, and a blocking member elastic member connected between the top of the brake exhaust chamber and the blocking member are provided in the elastic member chamber; an oil channel is provided on the rocker arm, and one end of the oil channel is connected to the flow channel; a limit member is provided in the brake exhaust chamber, and a reserved gap can be provided between the top of the piston column and the bottom of the limit member, and the height of the reserved gap is greater than the maximum height of the brake protrusion and less than the maximum height of the exhaust protrusion.

Description

Technical Field

[0001] The present invention relates to the technical field of brake mechanisms, and in particular to a rocker arm brake device, an engine system and a vehicle. Background Art

[0002] When a vehicle is driving and passing through a downhill section, prolonged braking will cause the brakes to overheat, which will affect the brake life over time. Rocker arm braking is a technology that achieves in-cylinder braking by opening the exhaust valve in advance or delaying the opening of the exhaust valve.

[0003] CN 203594476 U discloses an integrated rocker arm brake device for an engine, wherein one end of a rocker arm hinged on a rocker arm shaft is in contact with an exhaust cam through a roller hinged on the end, a brake mechanism for controlling the movement of an exhaust valve bridge is arranged at the other end of the rocker arm, a control mechanism is arranged on the rocker arm between the brake mechanism and the rocker arm shaft, and the exhaust cam drives the rocker arm to rotate in coordination with a hydraulic mechanism controlled by a solenoid valve to control the movement of the exhaust valve bridge through the control mechanism and the brake mechanism. The rocker arm brake device of this structure is complex. Summary of the invention

[0004] The object of the present invention is to provide a rocker arm brake device, an engine system and a vehicle, so as to solve the technical problem of the complex structure of the rocker arm brake device existing in the prior art to a certain extent.

[0005] The present invention provides a rocker arm brake device, comprising a rocker arm, a roller and a cam, wherein the roller is rotatably connected to one end of the rocker arm, the roller abuts against the cam, and the cam comprises a base body and a brake protrusion and an exhaust protrusion arranged on the base body; a brake exhaust chamber is arranged at one end of the rocker arm away from the roller, a piston column is arranged in the brake exhaust chamber, a gap is arranged between the top of the piston column and the top of the brake exhaust chamber to form an elastic member chamber, a flow channel connected to the elastic member chamber is arranged on the piston column, and the connection between the flow channel and the elastic member chamber is A blocking piece is provided at the passage; a piston elastic piece connected between the top of the brake exhaust chamber and the top of the piston column, and a blocking piece elastic piece connected between the top of the brake exhaust chamber and the blocking piece are provided in the elastic piece cavity; an oil channel is provided on the rocker arm, and one end of the oil channel is connected to the flow channel; a limiting piece is provided in the brake exhaust chamber, and a reserved gap can be provided between the top of the piston column and the bottom of the limiting piece, and the height of the reserved gap is greater than the maximum height of the brake protrusion and the height of the reserved gap is less than the maximum height of the exhaust protrusion.

[0006] The rocker arm brake device provided by the present invention can realize the conversion between normal exhaust and braking in one brake exhaust chamber, which greatly simplifies the structure of the rocker arm brake device and can realize the arrangement of a small number of oil passages on the rocker arm, making the processing of the rocker arm simple and convenient. The rocker arm brake device provided by the present invention has few parts, thereby reducing assembly, improving assembly accuracy, and improving assembly efficiency.

[0007] Furthermore, the rocker arm brake device also includes a valve stem and a valve stem elastic part; the piston column includes a sliding pin and a piston connected to the side of the sliding pin away from the elastic part cavity, and a valve stem cavity is provided on the piston; in the length direction of the sliding pin, the flow channel passes through the sliding pin, one end of the valve stem passes through the flow channel and is connected to the blocking member, one end of the valve stem is connected to one end of the valve stem elastic part, and the other end of the valve stem elastic part is connected to the bottom of the valve stem cavity.

[0008] Furthermore, a disc is connected to one end of the valve stem close to the valve stem elastic member, the disc is connected to the valve stem elastic member, and a cross-sectional area of ​​the disc is larger than a cross-sectional area of ​​the valve stem.

[0009] Furthermore, a blind hole is provided on the sliding pin at the top of the flow channel, and the diameter of the blind hole is larger than the diameter of the flow channel; the blocking member is a sphere, and part of the sphere is stuck in the blind hole.

[0010] Furthermore, an annular groove is provided on the peripheral wall of the sliding pin, and an oil hole communicating with the flow channel is provided on the annular groove; the annular groove is communicated with the oil channel.

[0011] Furthermore, the piston elastic member is a piston spring, the blocking member elastic member is a blocking member spring, and the piston spring is sleeved outside the piston spring.

[0012] Furthermore, a through hole communicating with the annular groove is provided on the rocker arm, the through hole is located on a side of the brake exhaust chamber away from the oil channel, and a plug is provided in the through hole.

[0013] Furthermore, an opening is provided at the top of the brake exhaust chamber, a plug is provided at the opening, a receiving groove is provided on the plug, a side plate of the receiving groove forms the limiting member, a limiting groove is provided on the piston column, and the limiting member can abut against the limiting groove in the length direction of the piston column.

[0014] The present invention provides an engine system, comprising an exhaust component and the rocker arm brake device, wherein one end of the piston column away from the elastic component cavity can abut against the exhaust component.

[0015] The present invention provides a vehicle, comprising the above engine system.

[0016] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of a rocker arm brake device in a first stage according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of a rocker arm brake device in the first stage according to another embodiment of the present invention;

[0020] Figure 3 for Figure 2 The structural schematic diagram of the rocker arm brake device in the second stage is shown;

[0021] Figure 4 for Figure 2 The structure diagram of the rocker arm brake device in the third stage is shown.

[0022] Icons: 100- rocker arm; 200- roller; 300- cam; 101- brake exhaust chamber; 102- piston rod; 103- elastic member chamber; 104- flow channel; 105- plugging piece; 106- piston elastic member; 107- plugging piece elastic member; 108- limit piece; 109- valve stem; 110- valve stem elastic member; 111- disc; 112- oil channel; 113- plugging; 1021- sliding pin; 1022- piston; 1023- valve stem chamber; 1024- annular groove; 301- base body; 302- brake protrusion; 303- exhaust protrusion. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figures 1 to 4 As shown, the present invention provides a rocker arm brake device, including a rocker arm 100, a roller 200 and a cam 300, wherein the roller 200 is rotatably connected to one end of the rocker arm 100, the roller 200 abuts against the cam 300, and the cam 300 includes a base 301 and a brake protrusion 302 and an exhaust protrusion 303 arranged on the base 301; a brake exhaust chamber 101 is provided at one end of the rocker arm 100 away from the roller 200, a piston column 102 is provided in the brake exhaust chamber 101, a gap is provided between the top of the piston column 102 and the top of the brake exhaust chamber 101 to form an elastic member chamber 103, a flow channel 104 connected to the elastic member chamber 103 is provided on the piston column 102, and a blocking member 105 is provided at the connection between the flow channel 104 and the elastic member chamber 103; a piston elastic member 106 connected between the top of the brake exhaust chamber 101 and the top of the piston column 102 is provided in the elastic member chamber 103, and a piston elastic member 106 connected between the top of the brake exhaust chamber 101 and the top of the piston column 102 is provided in the elastic member chamber 103. A blocking elastic member 107 is provided between the top of the brake exhaust chamber and the blocking member 105 (specifically, a piston elastic member 106 and a blocking elastic member 107 are provided in the elastic member chamber 103, one end of the piston elastic member 106 is connected to the top of the brake exhaust chamber, the other end of the piston elastic member 106 is connected to the top of the piston column 102, one end of the blocking elastic member 107 is connected to the top of the brake exhaust chamber, and the other end of the blocking elastic member 107 is connected to the blocking member 105); an oil passage 112 is provided on the rocker arm 100, one end of the oil passage 112 is connected to the flow channel 104, and the other end of the oil passage 112 is used to connect with an external oil supply device; a limit member 108 is provided in the brake exhaust chamber, and a reserved gap L can be provided between the top of the piston column 102 and the bottom of the limit member 108, and the height of the reserved gap L is greater than the maximum height of the brake protrusion 302 and the height of the reserved gap is less than the maximum height of the exhaust protrusion 303.

[0028] When the rocker arm brake device provided in this embodiment is working normally, a small amount of oil is introduced into the oil channel, and the oil in the brake exhaust chamber 101 and the oil in the oil channel 112 flow in both directions. The working process of the rocker arm brake device is as follows:

[0029] When the roller 200 contacts the base 301 of the cam 300, the rocker arm brake device is in the first stage, and the piston elastic member 106 is arranged to push the piston column 102 to abut against the external exhaust member (exhaust valve or exhaust valve bridge). At this time, the gap between the top of the piston column 102 and the bottom of the limit member 108 is the reserved gap L.

[0030] The roller 200 slides on the cam 300 relative to the cam 300. When the roller 200 contacts the braking protrusion 302, the rocker arm braking device is in the second stage. The braking protrusion 302 has a certain height. The braking protrusion 302 lifts the roller 200, thereby lifting the end of the rocker arm 100 provided with the roller 200. Correspondingly, the end of the rocker arm 100 away from the roller 200 drops. The resistance of the piston column 102 to the exhaust member is set to be greater than the force pushing the piston elastic member 106. Then, the piston column 102 moves toward the elastic member cavity 103 by the height of the braking protrusion 302. The maximum height of the braking protrusion 302 is less than the reserved gap L, and there is still a gap between the top of the piston column 102 and the limit member 108.

[0031] The roller 200 continues to slide on the cam 300 relative to the cam 300. When the roller 200 contacts the exhaust protrusion 303, the rocker arm brake device is in the third stage. The maximum height of the exhaust protrusion 303 is greater than the reserved gap L. Before the roller 200 reaches the top of the exhaust protrusion 303, the top of the piston column 102 abuts against the limit member 108, and the roller 200 continues to move. With the support of the limit member 108, the piston column 102 pushes the exhaust member to open the exhaust member of the engine system, thereby realizing normal exhaust of the engine system.

[0032] When the rocker arm brake device provided in this embodiment needs to assist the engine system in braking, oil with a set pressure is introduced into the oil passage 112 of the rocker arm 100, and the working process of the rocker arm brake device is as follows:

[0033] When the roller 200 contacts the base 301 of the cam 300, the rocker arm brake device is in the first stage. In this stage, the oil in the oil channel 112 enters the flow channel 104, pushes open the plug 105 and then enters the elastic component cavity 103. The oil pushes the piston column 102 to fit the exhaust component. The oil pressure is set to push the piston column 102 to fit the exhaust component, but is not enough to open the exhaust component. The oil fills the elastic component cavity 103, and the plug 105 allows the oil to enter the elastic component cavity 103 from the flow channel 104, but prevents the oil from flowing back from the elastic component cavity 103 to the oil channel. The oil realizes a hydraulic rigid connection in the elastic component cavity 103 and can transmit force.

[0034] The roller 200 slides on the cam 300 relative to the cam 300. When the roller 200 contacts the brake protrusion 302, the rocker arm brake device is in the second stage, and the oil in the elastic member cavity 103 forms a rigid connection. The height of the brake protrusion 302 is the distance that the piston rod 102 descends, that is, the opening of the exhaust member, and the exhaust member is directly pushed open, thereby achieving early exhaust and auxiliary braking. After the braking is completed, the oil with the set pressure can be removed.

[0035] The roller 200 continues to slide on the cam 300 relative to the cam 300. When the roller 200 contacts the exhaust protrusion 303, the rocker arm brake device is in the third stage. In this stage, the piston rod 102 continues to open the exhaust piece until the roller 200 reaches the top of the exhaust protrusion 303, the exhaust piece opens to the maximum, and the exhaust is completed.

[0036] The rocker arm brake device provided in this embodiment can realize the conversion between normal exhaust and braking in one brake exhaust chamber 101, which greatly simplifies the structure of the rocker arm brake device and can realize the arrangement of a small number of oil passages on the rocker arm 100, making the processing of the rocker arm 100 simple and convenient. The rocker arm brake device provided in this embodiment has fewer components, thereby reducing assembly, improving assembly accuracy, and improving assembly efficiency.

[0037] like Figures 2 to 4 As shown, on the basis of the above embodiment, the rocker arm brake device further includes a valve stem 109 and a valve stem elastic member 110; the piston column 102 includes a sliding pin 1021 and a piston 1022 connected to the side of the sliding pin 1021 away from the elastic member cavity 103, and a valve stem cavity 1023 is provided on the piston 1022; in the length direction of the sliding pin 1021, the flow channel 104 passes through the sliding pin 1021, one end of the valve stem 109 passes through the flow channel 104 and is connected to the blocking member 105, one end of the valve stem 109 is connected to one end of the valve stem elastic member 110, and the other end of the valve stem elastic member 110 is connected to the bottom of the valve stem cavity 1023.

[0038] In this embodiment, when oil with a set pressure is not supplied to the oil passage 112, the valve stem 109 can lift the blocking piece 105 with the support of the valve stem elastic member 110, that is, the blocking piece 105 is separated from the opening of the flow passage 104. When braking is required, the oil can directly enter the elastic member cavity 103 through the flow passage 104. In the initial stage, the oil does not need to push away the blocking piece 105. The resistance of the oil entering the elastic member cavity 103 makes the oil enter the elastic member cavity 103 faster, in a shorter time, and with higher efficiency. When the oil continues to enter the elastic member cavity 103, the oil pushes the blocking piece 105 to seal the opening of the flow passage 104. When the pressure on both sides of the blocking piece 105 is equal, the oil no longer enters the elastic member cavity 103.

[0039] Among them, Figure 1 As shown, the blocking member 105 may be a blocking plate, the area of ​​the blocking plate is larger than the cross-sectional area of ​​the opening of the flow channel 104 , the blocking plate can seal the opening of the flow channel 104 , and can realize the unidirectional flow of oil.

[0040] As an alternative, Figures 2 to 3 As shown, a blind hole is provided on the sliding pin 1021 at the top of the flow channel 104, and the diameter of the blind hole is larger than the diameter of the flow channel 104; the blocking member 105 is a sphere, and part of the sphere is stuck in the blind hole. In this embodiment, a step is formed between the blind hole and the flow channel 104, and part of the blocking member 105 is stuck in the blind hole, so the assembly of the blocking member 105 is stable.

[0041] like Figures 2 to 3 As shown, based on the above embodiment, further, one end of the valve stem 109 close to the valve stem elastic member 110 is connected with a disc 111, the disc 111 is connected to the valve stem elastic member 110, and the cross-sectional area of ​​the disc 111 is larger than the cross-sectional area of ​​the valve stem 109. In this embodiment, the disc 111 is arranged at one end of the valve stem 109 close to the valve stem elastic member 110, the valve stem elastic member 110 is connected to the disc 111, and the cross-sectional area of ​​the disc 111 is larger than the cross-sectional area of ​​the valve stem 109, so that the valve stem elastic member 110 is more convenient to arrange.

[0042] The valve stem elastic member 110 may be a spring sheet or a spring.

[0043] On the basis of the above embodiment, further, the piston elastic member 106 can be a spring sheet, and the blocking elastic member 107 can be a spring sheet.

[0044] As an alternative, Figures 2 to 4As shown, the piston elastic member 106 is the piston 1022 spring, the blocking member elastic member 107 is the blocking member 105 spring, and the piston 1022 spring is sleeved outside the piston 1022 spring. In this embodiment, the piston elastic member 106 is the piston 1022 spring, the blocking member elastic member 107 is the blocking member 105 spring, and the piston 1022 spring is sleeved outside the blocking member 105 spring. This structure can save installation space and make the structure compact.

[0045] like Figures 2 to 3 As shown, on the basis of the above embodiment, further, an annular groove 1024 is provided on the peripheral wall of the sliding pin 1021, and an oil hole connected to the flow channel 104 is provided on the annular groove 1024; the annular groove 1024 is connected to the oil channel. The number of the oil hole can be one or more, and the multiple oil holes are arranged at intervals along the circumferential direction of the sliding pin 1021; the oil can enter the annular groove from the oil channel, and the oil flows through the entire annular groove, and can flow into the brake exhaust chamber 101 at various positions in the circumferential direction of the sliding pin 1021 through the gap formed by the installation error between the sliding pin 1021 and the brake exhaust chamber 101, thereby lubricating the components in the brake exhaust chamber 101.

[0046] Based on the above embodiment, further, the top of the brake exhaust chamber 101 can be sealed, and the limit member 108 is fixed on the top of the brake exhaust chamber 101, wherein the limit member 108 can be a limit rod, a limit plate or a limit frame.

[0047] As an alternative, Figures 1 to 4 As shown, an opening is provided at the top of the brake exhaust chamber 101 (that is, the brake exhaust chamber 101 passes through the rocker arm 100), which can facilitate the installation of components in the brake exhaust chamber 101, and a plug 113 is provided at the opening, and a receiving groove is provided on the plug 113. The side plate of the receiving groove forms a limiting member 108, and a limiting groove is provided on the piston column 102. In the length direction of the piston column 102, the limiting member 108 can abut against the limiting groove, and the side plate of the receiving groove is stuck in the limiting groove, which can reduce the occupied space in the length direction of the piston column 102, so that the structure of the rocker arm brake device is compact.

[0048] The blocking member may be fixed to the rocker arm 100 by threaded connection or welding.

[0049] like Figures 2 to 4 As shown, based on the above embodiment, further, a through hole connected to the annular groove is provided on the rocker arm 100, the through hole is located on a side of the brake exhaust chamber 101 away from the oil channel, and a plug is provided in the through hole.

[0050] An embodiment of the present invention also provides an engine system, including an exhaust part and a rocker arm brake device of any of the above-mentioned technical solutions, and the end of the piston column 102 away from the elastic part cavity 103 can abut against the exhaust part, and thus has all the beneficial technical effects of the rocker arm brake device, which will not be repeated here.

[0051] An embodiment of the present invention further provides a vehicle, comprising an engine system of any of the above-mentioned technical solutions, and thus having all the beneficial technical effects of the engine system, which will not be described in detail herein.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In the description provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present invention and forming different embodiments.

Claims

1. A rocker arm brake device, comprising a rocker arm, a roller and a cam, wherein the roller is rotatably connected to one end of the rocker arm, the roller abuts against the cam, and the cam comprises a base body and a braking protrusion and an exhaust protrusion arranged on the base body; characterized in that: A brake exhaust chamber is provided at one end of the rocker arm away from the roller, a piston column is provided in the brake exhaust chamber, a gap is provided between the top of the piston column and the top of the brake exhaust chamber to form an elastic member chamber, a flow channel connected to the elastic member chamber is provided on the piston column, and a blocking member is provided at the connection between the flow channel and the elastic member chamber; a piston elastic member connected between the top of the brake exhaust chamber and the top of the piston column, and a blocking member elastic member connected between the top of the brake exhaust chamber and the blocking member are provided in the elastic member chamber; an oil channel is provided on the rocker arm, one end of the oil channel is connected to the flow channel; a limiting member is provided in the brake exhaust chamber, a reserved gap can be provided between the top of the piston column and the bottom of the limiting member, the height of the reserved gap is greater than the maximum height of the brake protrusion and the height of the reserved gap is less than the maximum height of the exhaust protrusion; It also includes a valve stem and a valve stem elastic member; the piston column includes a sliding pin and a piston connected to the sliding pin on a side away from the elastic member cavity, and the piston is provided with a valve stem cavity; in the length direction of the sliding pin, the flow channel passes through the sliding pin, one end of the valve stem passes through the flow channel and is connected to the blocking member, one end of the valve stem is connected to one end of the valve stem elastic member, and the other end of the valve stem elastic member is connected to the bottom of the valve stem cavity; One end of the valve stem close to the valve stem elastic member is connected with a disc, the disc is connected to the valve stem elastic member, and the cross-sectional area of ​​the disc is larger than the cross-sectional area of ​​the valve stem; An opening is provided at the top of the brake exhaust chamber, a plug is provided at the opening, a receiving groove is provided on the plug, a side plate of the receiving groove forms the limiting member, a limiting groove is provided on the piston column, and the limiting member can abut against the limiting groove in the length direction of the piston column.

2. The rocker arm brake device according to claim 1, characterized in that: A blind hole is provided on the sliding pin at the top of the flow channel, and the diameter of the blind hole is larger than the diameter of the flow channel; the blocking member is a sphere, and part of the sphere is stuck in the blind hole.

3. The rocker arm brake device according to claim 1, characterized in that: An annular groove is provided on the peripheral wall of the sliding pin, and an oil hole communicating with the flow channel is provided on the annular groove; the annular groove is communicated with the oil channel.

4. The rocker arm brake device according to claim 1, characterized in that: The piston elastic member is a piston spring, the blocking member elastic member is a blocking member spring, and the piston spring is sleeved outside the piston spring.

5. The rocker arm brake device according to claim 3, characterized in that: The rocker arm is provided with a through hole connected with the annular groove, the through hole is located at a side of the brake exhaust chamber away from the oil channel, and a plug is provided in the through hole.

6. An engine system, characterized in that: It comprises an exhaust member and a rocker arm brake device as claimed in any one of claims 1 to 5, wherein one end of the piston column away from the elastic member cavity can abut against the exhaust member.

7. A vehicle, characterized in that: Comprising the engine system as claimed in claim 6.

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