Piston guide device

Abstract

The invention discloses a piston guide device, and relates to the technical field of piston assembly, the piston guide device comprises a piston, a connecting rod and a piston guide cylinder for limiting the piston, the piston guide cylinder is provided with a guide mechanism for guiding the connecting rod to be inserted, and the guide mechanism comprises rotating parts which are arranged in a relatively rotating manner and have adjustable spacing; the guide cylinder cover plate is clamped and matched with the piston guide cylinder; and a piston assembly rod is inserted on the guide cylinder cover plate in a sliding manner. According to the piston guide device, the guide cylinder cover plate fixes and stabilizes the position of the piston assembly rod, in the piston pushing process, the piston assembly rod is guided stably, the piston is not prone to being clamped, the rotating piece abuts against the connecting rod, the effect of stably clamping the connecting rod can be achieved, inserting connection of the connecting rod is more stable, and the pressure of the rotating piece on the two sides of the connecting rod is equal; therefore, the rotating piece always moves along the axis of the piston in the inserting process, and the centering effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of piston assembly, in particular to a piston guide device. Background Art

[0002] The piston is usually assembled with the piston ring and connecting rod to form a piston-connecting rod assembly, and then the piston-connecting rod assembly is assembled in the opposite direction from the cylinder hole on the top surface of the engine body, with the connecting rod facing the inner cavity of the engine body. Improper operation of this process will cause assembly difficulties such as piston ring jamming.

[0003] In conjunction with the publication number (announcement number) CN208034557U, the publication date (announcement date) is 2018-11-02, and a piston connecting rod assembly guide tool is disclosed, including a guide tool fixing seat and a guide rod, wherein the guide rod is two and is respectively inserted into the two ends of the lower part of the guide tool fixing seat, and the flange surface of the connecting rod is in contact with the upper part of the guide tool fixing seat and slowly passed into the guide rod.

[0004] However, in the prior art including the above-mentioned patent, the guide rod can only ensure that the connecting rod does not hit the crankshaft journal, but cannot guide the connecting rod and the piston to be assembled, and there is a lack of clamping for the connecting rod during the assembly process. Summary of the invention

[0005] The object of the present invention is to provide a piston guide device for solving the above problems.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a piston guide device, comprising a piston and a connecting rod, comprising a piston guide cylinder for limiting the piston, on which a guide mechanism for guiding the connecting rod to be inserted is arranged, and the guide mechanism comprises a rotating member that is relatively rotatably arranged and has an adjustable spacing;

[0007] A guide cylinder cover plate that is snap-fitted with the piston guide cylinder, and on which a piston assembly rod is slidably inserted;

[0008] Wherein, the rotating member has a pressing position under the movable stroke of the connecting rod, and the distance between the two rotating members at the pressing position is consistent with the thickness of the connecting rod.

[0009] Preferably, the device further comprises a transmission ring disposed on the rotating member, and a first friction force when the transmission ring is tangent to the connecting rod is greater than a second friction force between the transmission ring and the rotating member.

[0010] Preferably, a rotating rod is rotatably disposed in the piston guide cylinder for making the rotating parts close to each other.

[0011] Preferably, a plurality of teeth are arranged in a circumferential array on the transmission ring, and an intermediate gear which meshes with the teeth for transmission is rotatably arranged at the end of the rotating rod.

[0012] Preferably, the invention further comprises hooks which are arranged in a circumferential array at the port of the piston guide cylinder and are used for hanging the piston ring, and which are driven to deflect to form a guiding surface pointing to the piston.

[0013] Preferably, it further comprises a sliding seat slidably arranged on the piston guide cylinder, the hook is rotatably arranged in the sliding seat, and there is a triggering position in the movable stroke of the sliding seat to deflect the hook.

[0014] Preferably, a transmission belt for traction of the slide is provided on the intermediate gear.

[0015] Preferably, a pressure rod is rotatably arranged in the slide seat, and a first torsion spring is arranged on the pressure rod, the hook is slidably arranged on the end of the pressure rod, and an elastic member is arranged on the hook for extending the hook toward the side wall of the piston.

[0016] Preferably, a pulling rope for pulling the hook back is provided on the slide seat.

[0017] Preferably, a sliding rod for tensioning the cable is slidably provided on the sliding seat along the length direction, and the pressure rod and the sliding rod are kept in sliding fit via a key groove.

[0018] In the above technical scheme, a piston guide device provided by the present invention has the following beneficial effects: the guide cylinder cover plate fixes the position of the piston assembly rod, and during the process of pushing the piston, the piston assembly rod is guided stably and the piston is not easy to get stuck. In addition, the pressure of the rotating part on the connecting rod can play a role in stabilizing the clamping of the connecting rod, making the insertion of the connecting rod smoother, and the pressure of the rotating part on both sides of the connecting rod is equal, so that the rotating part always keeps moving along the axis of the piston during the insertion process, which plays a centering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the piston guide cylinder and piston assembly provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the internal structure of a piston guide cylinder provided in an embodiment of the present invention;

[0023] Figure 4A schematic diagram of the guiding mechanism structure provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the internal structure of the hook and the pressure rod provided in an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of the pressure rod and arc groove provided in an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the planar structure of the first gear and the second gear provided in an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the planar structure of a rotating member provided in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Piston guide cylinder; 11. Positioning seat; 12. Through-hole seat; 13. Slide groove; 2. Guide cylinder cover plate; 3. Piston assembly rod; 4. Socket; 5. Connecting rod; 6. Piston; 7. Hook; 71. Cable; 72. Slide rod; 73. Elastic member; 74. Arc groove; 75. Pulling part; 76. Fixed seat; 8. Slide seat; 81. Transmission belt; 82. Rotating rod; 821. Second torsion spring; 83. Intermediate gear; 84. Pressure rod; 841. Adapter block; 85. First torsion spring; 9. Rotating member; 91. First gear; 92. Transmission ring; 93. Spring; 94. Second gear. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1-8 As shown, a piston guide device includes a piston 6 and a connecting rod 5, characterized in that it includes a piston guide cylinder 1 for limiting the piston 6, on which a guide mechanism for guiding the connecting rod 5 to be inserted is arranged, and the guide mechanism includes a rotating member 9 that is relatively rotatably arranged and has an adjustable spacing;

[0032] A guide cylinder cover plate 2 is engaged with the piston guide cylinder 1, and a piston assembly rod 3 is slidably inserted thereon;

[0033] The rotating member 9 has a pressing position under the movable stroke of the connecting rod 5 , and the distance between the two rotating members 9 at the pressing position is consistent with the thickness of the connecting rod 5 .

[0034] Specifically, the piston guide cylinder 1 is provided with a circumferential array of positioning seats 11 for limiting the piston 6 , and also includes a through hole seat 12 , on which a socket 4 for the pin hole of the guide piston 6 is provided, and a slide groove 13 is also provided on the piston guide cylinder 1 .

[0035] Furthermore, when assembling the piston-connecting rod assembly, firstly, the top surface of the piston 6 is directed toward the piston assembly rod 3, the connecting end of the connecting rod 5 is directed toward the piston 6, and then the piston guide cylinder cover plate 2 is covered. During the assembly process, one hand holds the piston guide cylinder 1, and the other hand pushes the piston assembly rod 3 forward. The assembly rod is made of rubber plastic material to avoid damaging the piston. There is a boss on the guide cylinder cover plate 2 to fix the position of the piston assembly rod 3. During the process of pushing the piston 6, the piston assembly rod 3 is guided firmly, and the piston 6 is not easy to get stuck.

[0036] Furthermore, a spring 93 is arranged between the rotating members 9 to make the two rotating members 9 approach each other. The rotating member 9 is an eccentric wheel, and the two rotating members 9 are respectively provided with a first gear 91 and a second gear 94, and the rotating shafts of the first gear 91 and the second gear 94 are slidably connected with the slide slot 13, and the first gear 91 and the second gear 94 mesh with each other and keep synchronous rotation. In the process of inserting the connecting rod 5 toward the piston 6, the connecting rod 5 moves between the two rotating members 9 and pushes the rotating member 9 to deflect. Since the rotating member 9 is an eccentric wheel, the spacing changes continuously during the deflection process until the connecting rod 5 can pass between the two rotating members 9. At this time, the spacing between the rotating members 9 is consistent with the thickness of the connecting rod 5. This is the pressing position of the rotating member 9, which can play a role in stably clamping the connecting rod 5, making the insertion of the connecting rod 5 more stable. And due to the setting of the first gear 91 and the second gear 94, the two rotating members 9 are always consistent. At this time, the pressure of the rotating member 9 on both sides of the connecting rod 5 is equal, so that the rotating member 9 always keeps moving along the axis of the piston 6 during the insertion process, which plays a centering role. Then insert the pin along the socket 4 to complete the assembly. After the assembly is completed, first pull out the guide cylinder cover 2 and the piston assembly rod 3, then move the first gear 91 and the second gear 94 away from each other along the slide groove 13, manually overcome the elastic force of the spring 93, so that a gap sufficient for the connecting rod to pass through is formed between the two gears, and then pull out the piston 6 and the connecting rod 5.

[0037] In the above technology, the guide cylinder cover plate 2 fixes the position of the piston assembly rod 3. During the process of pushing the piston 6, the piston assembly rod 3 is guided firmly and the piston 6 is not easy to get stuck. In addition, the pressure of the rotating part 9 on the connecting rod 5 can play a role in stably clamping the connecting rod 5, making the insertion of the connecting rod 5 smoother. The pressure of the rotating part 9 on both sides of the connecting rod 5 is equal, so that the rotating part 9 always keeps moving along the axis of the piston 6 during the insertion process, which plays a centering role.

[0038] As an embodiment further provided by the present invention, it also includes a transmission ring 92 arranged on the rotating member 9, and the first friction force when the transmission ring 92 is tangent to the connecting rod 5 is greater than the second friction force between the transmission ring 92 and the rotating member 9.

[0039] Specifically, when the connecting rod 5 begins to be plugged in, since the first friction force is greater than the second friction force, the connecting rod 5 is first tangent to the transmission ring 92 and drives the transmission ring 92 to rotate. At the same time, the connecting rod 5 will push the rotating part 9 to deflect. At this time, the second friction force will produce resistance to the connecting rod 5 in the opposite direction of the plugging direction, which plays a damping role, making the plugging path of the connecting rod 5 stable.

[0040] As another embodiment further provided by the present invention, a rotating rod 82 is rotatably provided in the piston guide cylinder 1 for making the rotating parts 9 close to each other.

[0041] Specifically, a second torsion spring 821 is provided on the rotating rod 82, and the second torsion spring 821 drives the two rotating rods 82 to rotate toward the axis of the piston guide cylinder 1, so that the end of the rotating rod 82 abuts against the rotating member 9. Even if the position of the abutment changes with the rotation of the rotating member 9, the second torsion spring 821 can also be adaptively adjusted. Through the support of the rotating rod 82, the two rotating members 9 are abutted against each other, and can actively adapt to connecting rods 82 of different thicknesses, which is more practical.

[0042] As another embodiment further provided by the present invention, a plurality of teeth are arranged in a circumferential array on the transmission ring 92, and an intermediate gear 83 which is rotatably arranged at the end of the rotating rod 82 and meshes with the teeth for transmission.

[0043] Specifically, the transmission ring 92 drives the intermediate gear 83 to press against the rotating member 9, and makes the intermediate gear 83 mesh with the transmission ring 92, so that the fit between the intermediate gear 83 and the rotating member 9 is tighter, and no gap will appear with the eccentric rotation of the rotating member 9, so that the rotating member 9 automatically adapts to the connecting rods 82 of different thicknesses.

[0044] As another embodiment further provided by the present invention, it also includes hooks 7 which are arranged in a circumferential array at the end of the piston guide cylinder 1 and are used to hang piston rings. The hooks 7 are driven to deflect to form a guiding surface pointing to the piston 6.

[0045] Specifically, the hook 7 is provided with a recessed portion for hanging the piston ring. The piston ring is put on the hook 7, at which time the hook 7 is slightly tilted and the tip portion points to the axis of the piston guide tube 1, and the piston ring is slid into the recessed portion along the tip, and the piston ring is not expanded at this time. After the assembly is completed, the connecting rod 5 continues to move toward the piston 6, and the connecting rod 5 pushes the piston 6 until the piston 6 is separated from the piston guide tube 1. The end of the piston 6 supports multiple hooks 7, so that the hook 7 deflects and expands the piston ring, and the piston 6 continues to be pushed until the groove on the outer wall of the piston 6 corresponds to the piston ring. Then the hook 7 can be rotated manually, or a motor can be set to drive the hook 7 to deflect, so that the tip of the hook 7 points to the groove. At this time, the recessed portion to the tip is an inclined guide surface. Since the piston ring has a tendency to shrink under its own elasticity, the piston ring slides along the guide surface to the groove, so that it is sleeved at the groove, completing the sleeve connection of the piston ring.

[0046] As another embodiment further provided by the present invention, it also includes a slide seat 8 slidably arranged on the piston guide cylinder 1, the hook 7 is rotatably arranged in the slide seat 8, and there is a triggering position in the movable stroke of the slide seat 8 to deflect the hook 7.

[0047] Specifically, the position of the piston 6 is the first end of the piston guide cylinder 1, and the position opposite thereto is the second end. In the initial state, the slide 8 is located at the first end port of the piston guide cylinder 1. The slide 8 can be slid from the first end to the second end by manual sliding, driving the hook 7 and the piston ring sleeved thereon to move synchronously, until the piston ring moves to the groove on the piston 6, which is the triggering position, and a switch can be set at the triggering position to drive the motor to start, so that the motor drives the hook 7 to deflect, or when the slide 8 reaches the triggering position, a key groove is set at the corresponding position of the hook 7 to guide the hook 7 to deflect.

[0048] As another embodiment further provided by the present invention, a transmission belt 81 for pulling the slide seat 8 is provided on the intermediate gear 83 .

[0049] Specifically, the transmission belt 81 is wound around the intermediate gear 83, and the two ends of the transmission belt 81 are respectively connected to different ends of the slide 8. When the connecting rod 5 is plugged in, the connecting rod 5 drives the transmission ring 92 to rotate, and the transmission ring 92 drives the intermediate gear 83 to rotate through gear meshing, thereby driving the transmission belt 81 to move. Figure 4 In this state, the transmission belt 81 pulls the slide 8 to move along the first end of the piston guide cylinder 1 to the second end, so that the slide 8 automatically reaches the triggering position as the connecting rod 5 is plugged in, without the need for other power sources, thus saving costs.

[0050] As another embodiment further provided by the present invention, a pressure rod 84 is rotatably arranged in the slide seat 8, and a first torsion spring 85 is arranged on the pressure rod 84, the hook 7 is slidably arranged at the end of the pressure rod 84, and an elastic member 73 is arranged on the hook 7 for extending the hook 7 toward the side wall of the piston 6.

[0051] Specifically, the first torsion spring 85 drives the pressing rod 84 to tilt toward the axis in the default state, and the elastic member 73 drives the hook 7 to abut against the side wall of the piston 6. When the slide 8 slides from the first end to the second end, the tip moves along the side wall of the piston 6. When the tip moves to the groove, it is not pressed by the side wall. The tip enters the groove and causes the hook 7 to automatically deflect, and the piston ring on the hook 7 enters the groove. Then the slide 8 continues to move and drives the hook 7 to recover. When the slide 8 slides from the second end to the first end, the tip of the hook 7 will abut against the outer wall of the piston ring and deflect under the guidance of the outer wall surface of the piston ring to prevent the hook 7 from interfering with the removal of the piston 6.

[0052] As another embodiment further provided by the present invention, a pull rope 71 for pulling the hook 7 back is provided on the slide seat 8 .

[0053] Specifically, it also includes a fixed seat 76 slidably disposed in the pressure rod 84, the elastic member 73 is used to push the fixed seat 76 to extend outward, the hook 7 is rotatably disposed on the fixed seat 76, and the hook 7 is provided with a pulling portion 75 for fixing the cable 71, the pulling force of the cable 71 on the pulling portion 75 drives the hook 7 to deflect in the direction away from the axis, and the pressure rod 81 is provided with an adapter block 841. When the piston guide cylinder 1 is not plugged into the piston 6, the sliding seat 8 and the pressure rod 84, and the hook 7 are all located at the first end of the piston guide cylinder 1, the elastic member 73 pushes the fixed seat 76 to extend outward, so that the connection between the fixed seat 76 and the rotating shaft of the hook 7 is located outside the port of the pressure rod 84, the cable 71 applies a pulling force to the pulling portion 75, so that the hook 7 deflects in the direction away from the axis, so that the inner sides of the plurality of hooks 7 present an inclined surface facing the axis, such as Figure 5 In the state shown, when the piston 6 is inserted, the edge of the piston 6 will abut against the above-mentioned inclined surface, automatically correcting the skewed state of the piston 6. The piston 6 can be inserted in a coaxial state with the piston guide tube 1 by guiding the inclined surface.

[0054] Furthermore, the piston 6 will firstly engage with the adapter block 841, so that the adapter block 841 deflects to a state in contact with the outer wall of the piston 6, thereby correcting the angle of the pressure rod 84, so that the pressure rod 84 can abut against the outer wall of the piston 6. At the same time, a slide bar 72 for tensioning the cable 71 is provided on the slide seat 8 in a sliding manner along the length direction. Since an arc groove 74 is provided on the hook 7, the arc groove 74 and the slide bar 72 are slidably matched. During the deflection of the hook 7, the arc groove 74 is driven to deflect, and the arc groove 74 squeezes the slide bar 72, so that the slide bar 72 slides along the length direction of the slide seat 8, and the cable 71 is wrapped around the slide bar 72. During the sliding of the slide bar 72, the cable 71 is tensioned, and the cable 71 pulls the hook 7, so that the hook 7 retracts into the pressure rod 84. At this time, the rotating shaft of the hook 7 is retracted into the pressure rod 84, so that the hook 7 is blocked by the end of the pressure rod 84, and the rotation of the hook 7 is restricted by the pressure rod 84. Figure 6 The hook 7 is deflected from being away from the axis to being toward the axis, which makes it convenient to sleeve the piston ring onto the hook 7.

[0055] During the movement of the slide 8, the tip of the hook 7 is driven to move along the outer wall of the piston 6. When the hook 7 enters the groove, the hook 7 deflects and squeezes the slide rod 72 through the arc groove 74 again. The slide rod 72 slides along the length direction of the slide 8 and pulls the cable 71, so that the hook 7 is completely retracted into the pressure rod 84 and disengaged from the piston ring, so that the piston ring is automatically entangled in the groove.

[0056] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A piston guide device, comprising a piston (6) and a connecting rod (5), characterized in that: It comprises a piston guide cylinder (1) for limiting a piston (6), on which a guide mechanism for guiding the insertion of a connecting rod (5) is arranged, and the guide mechanism comprises a rotating member (9) which is relatively rotatably arranged and has an adjustable spacing; A guide cylinder cover plate (2) which is engaged with the piston guide cylinder (1) and on which a piston assembly rod (3) is slidably inserted; The rotating member (9) has a pressing position within the movable stroke of the connecting rod (5), and the distance between the two rotating members (9) at the pressing position is consistent with the thickness of the connecting rod (5).

2. A piston guide device according to claim 1, characterized in that: It also includes a transmission ring (92) arranged on the rotating member (9), and a first friction force when the transmission ring (92) and the connecting rod (5) are tangent is greater than a second friction force between the transmission ring (92) and the rotating member (9).

3. A piston guide device according to claim 2, characterized in that: A rotating rod (82) is rotatably arranged in the piston guide cylinder (1) and is used to make the rotating parts (9) closely contact each other.

4. A piston guide device according to claim 3, characterized in that: The transmission ring (92) is provided with a plurality of teeth in a circumferential array, and the end of the rotating rod (82) is rotatably provided with an intermediate gear (83) that meshes with the teeth for transmission.

5. A piston guide device according to claim 4, characterized in that: It also comprises hooks (7) which are arranged in a circumferential array at the end of the piston guide cylinder (1) and are used to hang the piston ring. The hooks (7) are driven to deflect to form a guide surface pointing to the piston (6).

6. A piston guide device according to claim 5, characterized in that: It also comprises a slide seat (8) slidably arranged on the piston guide cylinder (1), the hook (7) is rotatably arranged in the slide seat (8), and there is a triggering position in the movable stroke of the slide seat (8) to deflect the hook (7).

7. A piston guide device according to claim 6, characterized in that: The intermediate gear (83) is provided with a transmission belt (81) for pulling the slide seat (8).

8. A piston guide device according to claim 6, characterized in that: A pressure rod (84) is rotatably arranged in the slide seat (8), and a first torsion spring (85) is arranged on the pressure rod (84). The hook (7) is slidably arranged at the end of the pressure rod (84), and an elastic member (73) is arranged on the hook (7) for extending the hook (7) toward the side wall of the piston (6).

9. A piston guide device according to claim 8, characterized in that: The sliding seat (8) is provided with a pulling rope (71) for pulling the hook (7) back.

10. A piston guide device according to claim 9, characterized in that: A slide bar (72) for tensioning the cable (71) is slidably arranged on the slide seat (8) along the length direction, and the pressing rod (84) and the slide bar (72) are kept in sliding cooperation via a key groove.

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