Hard alloy cast iron piston

Abstract

The utility model discloses a hard alloy cast iron piston which comprises a piston body and a plurality of rotation stopping pins. A plurality of piston ring grooves used for installing piston rings are formed in the end, close to the piston top, of the outer side of the piston body. A first reinforcing part is arranged at the position, corresponding to the piston ring groove, of the inner side of the piston body. A mounting hole penetrating through the first reinforcing part in the radial direction of the piston body is formed in the piston ring groove, and the rotation stopping pin is mounted in the mounting hole. The piston has the beneficial effects that compared with an existing piston, the first reinforcing part is arranged on the piston main body, so that the wall thickness of the multiple mounting holes, used for mounting the multiple rotation stopping pins, in the piston main body is increased, and then the multiple rotation stopping pins can be stably mounted on the piston main body to limit a piston ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pistons, in particular to a hard alloy cast iron piston. BACKGROUND

[0002] The main function of the piston is to withstand high temperature and high pressure environment to ensure the normal operation of the engine.

[0003] Most of the existing pistons are made of aluminum alloy, but the sealing performance of aluminum alloy is poor, the relative strength is low, the toughness is poor, the plasticity is poor, and the corrosion resistance is strong, which also leads to the relatively short service life of the piston made of aluminum alloy; at the same time, the piston made of aluminum alloy is easy to wear, and long-term use will also cause the cylinder to wear and the engine speed to decrease, in order to maintain the normal operation of the machine, the piston and the cylinder need to be replaced constantly, which increases the cost of the machine.

[0004] Therefore, it is necessary to improve the existing piston. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a piston which can solve at least one of the defects in the background art.

[0006] In order to achieve the above at least one purpose, the technical scheme adopted by the present application is as follows: a hard alloy cast iron piston, comprising a piston body and a plurality of anti-rotation pins; a plurality of piston ring grooves for mounting piston rings are arranged on the outer side of the piston body near one end of the piston top; a first reinforcing portion is arranged on the inner side of the piston body corresponding to the position of the piston ring groove; a mounting hole is arranged in the piston ring groove and penetrates the first reinforcing portion along the radial direction of the piston body; and the anti-rotation pin is mounted in the mounting hole.

[0007] Preferably, the number of mounting holes is multiple, and the multiple mounting holes are distributed in the circumferential direction of the piston body; and the first reinforcing portion is annularly arranged on the inner side of the piston body.

[0008] Preferably, the number of mounting holes is multiple, and the multiple mounting holes are distributed in the circumferential direction of the piston body; and the first reinforcing portion comprises a plurality of protrusions; and the protrusions correspond to the positions of the mounting holes.

[0009] Preferably, the piston body is provided with a pair of through connecting holes at one end away from the piston top; and a pair of bosses are arranged on the inner side of the piston body corresponding to the positions of the connecting holes.

[0010] Preferably, a second reinforcing portion is arranged on the inner side of the piston body; and the bosses and the first reinforcing portion are connected through the second reinforcing portion.

[0011] Preferably, the plurality of protrusions are divided into two groups, and the positions of the protrusions in the two groups are close to the two connecting holes respectively; the second reinforcing part comprises a first reinforcing rib, the upper end of the first reinforcing rib is connected to the boss, and the lower end of the first reinforcing rib extends to the bottom end of the piston body and passes through the protrusion.

[0012] Preferably, the second reinforcing part further comprises a second reinforcing rib; the second reinforcing rib is arranged at the upper end of the boss.

[0013] Preferably, the first reinforcing part, the boss, the second reinforcing part and the piston body are suitable for being integrally cast into shape.

[0014] Preferably, the plurality of rotation-stopping pins are suitable for being correspondingly installed in the plurality of mounting holes through transition or interference fit.

[0015] Preferably, the material of the piston body is titanium alloy material.

[0016] Compared with the prior art, the beneficial effects of the present application are that:

[0017] Compared with the prior art, the beneficial effects of the present application are that: The accompanying drawings are briefly described as follows:

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 It is a sectional view of the right view direction of the utility model.

[0020] Figure 3 It is a sectional view of the front view direction of the utility model.

[0021] Figure 4 It is a sectional view of the front view direction of the utility model. Figure 3 It is a sectional view of the front view direction of the utility model.

[0022] Figure 5 It is a sectional view of the front view direction of the utility model.

[0023] Figure 6 It is a sectional view of the front view direction of the utility model.

[0024] Figure 7 It is a sectional view of the front view direction of the utility model.

[0025] Figure 8 It is a sectional view of the front view direction of the utility model.

[0026] Figure 9 The third mounting hole position diagram of the utility model.

[0027] In the figure: piston body 1, connecting hole 10, first piston ring groove 11, second piston ring groove 12, third piston ring groove 13, first rotation-stopping pin 20, second rotation-stopping pin 21, third rotation-stopping pin 22, first reinforcing part 3, first protrusion 30, first mounting hole 300, second protrusion 31, second mounting hole 310, third protrusion 32, third mounting hole 320, second reinforcing part 4, first reinforcing rib 40, second reinforcing rib 41, boss 5. DETAILED DESCRIPTION

[0028] Hereinafter, the present application will be further described in conjunction with specific embodiments, and it should be noted that, under the premise of not conflicting, the following described embodiments or technical features can be combined to form new embodiments.

[0029] In the description of the present application, it should be noted that, for orientation words, such as terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0031] The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] One of the preferred embodiments of the present application is as follows: Figures 1 to 9As shown, a hard alloy cast iron piston comprises a piston body 1 and a plurality of anti-rotation pins. The piston body 1 is provided with a plurality of piston ring grooves for mounting piston rings at one end close to the piston top; when the piston body 1 is working, the piston rings will rotate in the piston ring grooves along with the operation of the piston body 1, but the rotation of the piston rings will cause the piston rings to break, thereby affecting the subsequent operation of the entire piston body 1. Therefore, the piston ring grooves are provided with mounting holes penetrating the piston body 1 radially, the number of mounting holes is multiple, and the multiple mounting holes are distributed along the circumferential direction of the piston body 1; the multiple anti-rotation pins are respectively mounted in the multiple mounting holes, and the multiple anti-rotation pins can limit the multiple piston rings mounted in the multiple piston ring grooves to prevent the piston rings from rotating in the piston ring grooves.

[0033] It should be known that the wall thickness of the existing piston is equal, and a plurality of piston ring grooves for mounting piston rings are also provided at one end close to the piston top, but the piston ring grooves have a depth, so that the structure of the existing piston at one end close to the piston top is weak; at this time, mounting holes are provided in the piston ring grooves, and the mounting holes also have a depth, so that the structure of the mounting holes is more fragile and cannot support the piston for a long time.

[0034] Therefore, in the present embodiment, a first reinforcing portion 3 corresponding to the positions of the plurality of piston ring grooves is arranged inside the piston body 1. The plurality of mounting holes penetrate the plurality of piston ring grooves and the first reinforcing portion 3, so that the depth of the mounting holes is increased, and the multiple anti-rotation pins can be stably mounted in the multiple mounting holes to work stably.

[0035] However, there are many specific structure setting methods for the first reinforcing portion 3, including but not limited to the following two methods.

[0036] Method one: the first reinforcing portion 3 is annularly arranged along the circumferential direction of the inner wall of the piston body 1.

[0037] Method two: the first reinforcing portion 3 comprises a plurality of protrusions; the plurality of protrusions correspond to the positions of the plurality of mounting holes, and the plurality of mounting holes penetrate the plurality of piston ring grooves and the plurality of protrusions.

[0038] It should be known that the above two methods can meet the needs of the present application, and those skilled in the art can choose according to actual needs; in the present embodiment, the above-mentioned method two is preferably adopted.

[0039] It can be understood that the difference between the above-mentioned method one and method two is that the first reinforcing portion 3 in method one is a whole structure, which increases the depth of the mounting hole and the thickness of other parts of the piston body 1; while the first reinforcing portion 3 in method two is subdivided to the position of each mounting hole, and a protrusion is arranged at the corresponding position of each mounting hole, only the depth of the mounting hole is increased.

[0040] It is understandable that, within the piston body 1, at the locations corresponding to the multiple piston ring grooves, only the depth of the mounting holes needs to be increased; other parts do not require an increase in thickness or depth. Furthermore, the addition of the first reinforcing part 3 inevitably increases the overall weight of the piston body 1. Therefore, in this embodiment, the second method described above is chosen, where protrusions are provided at the corresponding positions of each mounting hole, increasing only the depth of the mounting holes.

[0041] In this embodiment, as Figures 2 to 9 As shown, three piston ring grooves are provided at one end of the piston body 1 near the piston top, namely a first piston ring groove 11, a second piston ring groove 12, and a third piston ring groove 13. Correspondingly, the mounting holes include a first mounting hole 300 in the first piston ring groove 11, a second mounting hole 310 in the second piston ring groove 12, and a third mounting hole 320 in the third piston ring groove 13. Furthermore, the multiple protrusions included in the first reinforcing part 3 are respectively a first protrusion 30 corresponding to the position of the first mounting hole 300, a second protrusion 31 corresponding to the position of the second mounting hole 310, and a third protrusion 32 corresponding to the position of the third mounting hole 320. At the same time, the number of anti-rotation pins corresponds to the number of mounting holes, namely a first anti-rotation pin 20 installed in the first mounting hole 300, a second anti-rotation pin 21 installed in the second mounting hole 310, and a third anti-rotation pin 22 installed in the third mounting hole 320.

[0042] Understandably, if the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 are to operate stably, the depth of the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320 is only one of the decisive factors. The connection method between the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 and the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320 is also particularly important.

[0043] It should be understood that, in this embodiment, there are multiple ways to connect the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 with the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320, respectively. An interference fit can be used to install the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 into the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320, respectively. Alternatively, a transition fit can be used to install the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 into the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320, respectively.

[0044] It should be understood that the aforementioned interference fit or transition fit can enable a stable connection between the first anti-rotation pin 20, the second anti-rotation pin 21, and the third anti-rotation pin 22 and the first mounting hole 300, the second mounting hole 310, and the third mounting hole 320. Furthermore, the connection between the anti-rotation pins and the mounting holes in this embodiment is not limited to the two connection methods described above. Those skilled in the art can choose the specific connection method as needed.

[0045] In this embodiment, as described above, the piston body 1 has a first piston ring groove 11, a second piston ring groove 12, and a third piston ring groove 13 at the end near the piston top. However, the piston body 1 also needs to be connected to the piston rod for normal operation. Therefore, the piston body 1 has a pair of through-holes 10 at the end away from the three piston ring grooves. The piston body 1 can be connected to the piston rod through these through-holes 10.

[0046] However, the setting of the connecting hole 10 will cause the same problem as the setting of the above mounting hole, that is, the wall thickness of the piston body 1 is not thick, and the setting of the connecting hole 10 will make the structure of the piston body 1 at the end away from the piston top relatively weak, thus affecting the service life of the piston body 1.

[0047] Therefore, in this embodiment, as Figures 2 to 6 As shown, the piston body 1 is also provided with a pair of bosses 5; the positions of the pair of bosses 5 and the pair of connecting holes 10 correspond. The bosses 5 are provided with holes of the same size as the connecting holes 10, so that the piston body 1 and the piston rod can be connected; at the same time, the bosses 5 are fixedly connected to the inner wall of the piston body 1, so that the wall thickness of the connecting holes 10 is increased, thereby allowing the piston rod to work stably after passing through the connecting holes 10 and connecting with the piston body 1.

[0048] It is understandable that the boss 5 is only connected to the inner wall of the piston body 1, which may cause the boss 5 to be unable to continue to work stably after a long period of operation, thus affecting the operation of the entire piston body 1.

[0049] Therefore, in this embodiment, as Figures 2 to 6 As shown, a second reinforcing part 4 is also provided inside the piston body 1; the second reinforcing part 4 includes a first reinforcing rib 40. The boss 5 and the first reinforcing part 3 are connected by the second reinforcing part 4, but the positions of the three bosses in the first reinforcing part 3 are dispersed. If only one first reinforcing rib 40 is provided, it needs to be wrapped around the inner wall of the piston body 1 multiple times.

[0050] Therefore, in the embodiment, two first reinforcing ribs 40 are arranged. The first protrusions 30, the second protrusions 31 and the third protrusions 32 are divided into two groups and extend to the corresponding connecting holes 10. The first protrusions 30 and the third protrusions 32 are arranged in one group, and the second protrusions 31 are arranged in one group. The first protrusions 30 and the third protrusions 32 are connected with the same first reinforcing rib 40, and the second protrusions 31 are connected with another first reinforcing rib 40. The first reinforcing rib 40 is in a U shape, and the two top ends of the first reinforcing rib 40 are respectively fixedly connected with the bottom ends of the pair of bosses 5. Meanwhile, the lower end of the first reinforcing rib 40 extends to the bottom end of the piston body 1, so that the stability of the boss 5 is further improved. The pair of first reinforcing ribs 40 are respectively arranged in the piston body 1 along the axis of the boss 5 in a symmetrical manner.

[0051] It should be known that, when the piston body 1 works, the force acting on the piston body 1 is upward, so that the boss 5 is also subjected to an upward force. After long-time use, the boss 5 tends to deform upward, which affects the working of the piston body 1.

[0052] Therefore, in the embodiment, the second reinforcing part 4 further comprises a second reinforcing rib 41 arranged at the upper end of the boss 5 and in a pair, so as to enhance the compression resistance of the upper end of the boss 5, and thus the boss 5 can still work stably under the condition of long-time upward force.

[0053] In the embodiment, the first reinforcing part 3, the second reinforcing part 4 and the boss 5 can be welded to the inner wall of the piston body 1, or the first reinforcing part 3, the second reinforcing part 4, the boss 5 and the piston body 1 can be integrally cast. In the embodiment, the first reinforcing part 3, the second reinforcing part 4, the boss 5 and the piston body 1 are integrally cast.

[0054] It should be known that, the main function of the piston is to bear the high-temperature and high-pressure environment and ensure the normal operation of the engine. Most of the existing pistons are made of aluminum alloy, but the aluminum alloy has poor sealing performance, relatively low strength, poor toughness, poor plasticity and strong corrosion resistance. This also leads to a relatively short service life of the piston made of aluminum alloy. At the same time, the piston made of aluminum alloy is easy to wear, and long-time use will cause the cylinder to wear and the engine speed to decrease. In order to maintain the normal operation of the machine, the piston and the cylinder need to be replaced constantly, which increases the cost of the machine. At the same time, even if the piston made of aluminum alloy is provided with the first reinforcing part 3, the second reinforcing part 4 and the boss 5, etc., it will still be worn during operation and the wall thickness will decrease.

[0055] Therefore, in the present embodiment, the material of the piston body 1 is changed from aluminum alloy to titanium alloy, so that the service life of the piston body 1 is prolonged, and the old cylinder which is worn out can also be reused, thereby avoiding the waste of parts.

[0056] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A cemented carbide cast iron piston, characterized in that, include: The piston body comprises a piston body and multiple anti-rotation pins; the outer side of the piston body is provided with multiple piston ring grooves for mounting piston rings at one end near the piston top; the inner side of the piston body is provided with a first reinforcing part at a position corresponding to the piston ring groove; the piston ring groove is provided with a mounting hole that penetrates the first reinforcing part radially along the piston body, and the anti-rotation pins are mounted in the mounting hole.

2. The cemented carbide cast iron piston as described in claim 1, characterized in that: There are multiple mounting holes, which are spaced apart along the circumference of the piston body; the first reinforcing part is arranged in a ring on the inner side of the piston body.

3. A cemented carbide cast iron piston as described in claim 1, characterized in that: There are multiple mounting holes, which are spaced apart along the circumference of the piston body; the first reinforcing part includes multiple protrusions; the protrusions and the mounting holes are positioned correspondingly.

4. A cemented carbide cast iron piston as described in claim 3, characterized in that: The piston body has a pair of through-holes at one end away from the piston top; the inner side of the piston body has a pair of bosses at the corresponding positions of the through-holes.

5. A cemented carbide cast iron piston as described in claim 4, characterized in that: The piston body has a second reinforcing part on its inner side; the boss and the first reinforcing part are adapted to be connected through the second reinforcing part.

6. A cemented carbide cast iron piston as described in claim 5, characterized in that: The protrusions are divided into two groups, and the two groups of protrusions are respectively located close to the two connecting holes; the second reinforcing part includes a first reinforcing rib, the upper end of which is connected to the boss, and the lower end of which extends to the bottom end of the piston body and passes through the protrusion.

7. A cemented carbide cast iron piston as described in claim 6, characterized in that: The second reinforcing part further includes a second reinforcing rib; the second reinforcing rib is disposed at the upper end of the boss.

8. A cemented carbide cast iron piston as described in claim 5, characterized in that: The first reinforcing part, the boss, the second reinforcing part, and the piston body are adapted to be integrally cast.

9. A cemented carbide cast iron piston as described in claim 1, characterized in that: The plurality of anti-rotation pins are adapted to be installed in the plurality of mounting holes by means of transition or interference fit.

10. A cemented carbide cast iron piston as described in claim 1, characterized in that: The piston body is made of titanium alloy.

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