Auxiliary retraction tool for engine chain tensioner plunger

Abstract

The invention provides an auxiliary retraction tool for a plunger of an engine chain tensioner, and belongs to the technical field of engine disassembly and assembly tools. The tool is reasonable in structure, compact in layout and high in adaptability, and the labor intensity of workers is relieved. A main body frame of the tool is provided with a slide way and a distribution groove in parallel in the length direction, a supporting and pressing assembly is installed in the slide way in a sliding mode, a driving assembly, located at the upper end, of a clamping assembly is inserted in the distribution groove, and the clamping end of the clamping assembly is hung below the main body frame. A tensioner to be assembled is clamped at the clamping end of the clamping assembly and located below the sliding way, and the supporting and pressing assembly is adjusted in a sliding mode to open the clamping spring to be matched with the clamping assembly to assemble a workpiece. The tool is adjustable in structure and can meet the requirements for retraction of plungers of chain tensioners of various sizes, the supporting and pressing assembly and the clamping assembly are arranged in a combined mode, opening of the clamping spring and back pushing of the plungers can be executed at the same time, the working difficulty is lowered, the labor intensity of technicians is lowered, and therefore the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engine disassembly and assembly tools, and in particular relates to an engine chain tensioner plunger auxiliary retraction tool. Background Art

[0002] During the daily maintenance of the engine, after the timing chain tensioner is disassembled, the plunger needs to be manually prodded and pressed to retract by the plunger retaining spring. During the operation, the technician needs to use existing basic tools such as screwdrivers, pliers, etc., which are not adaptable to the plunger. The probability of success in one operation is low, and it often takes a long time, resulting in low work efficiency and high labor intensity. At the same time, because there is no adaptable tool, the retaining spring is easily damaged during the maintenance process, affecting the working performance of the components. Therefore, a highly adaptable auxiliary tool is needed to help technicians simplify the maintenance process and improve work efficiency. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned background technology, the present invention provides an engine chain tensioner plunger auxiliary retraction tool, which has a reasonable structure, a compact layout, high adaptability, and reduces manual labor intensity.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an engine chain tensioner plunger auxiliary retraction tool, including a main frame, a supporting and pressing assembly and a clamping assembly, a slideway is provided on the main frame along the length direction, the supporting and pressing assembly is slidably installed in the slideway, a wiring groove is provided on the main frame parallel to the slideway, the driving assembly of the clamping assembly is located at the upper end and inserted in the wiring groove, the clamping end of the clamping assembly is located at the lower end and is suspended below the main frame, the driving assembly is operated to adjust the clamping diameter of the clamping assembly to adapt to clamping the tensioner to be assembled, the tensioner to be assembled is clamped on the clamping end of the clamping assembly and is located below the slideway, the supporting and pressing assembly is slidably adjusted to open the retaining spring and cooperate with the clamping assembly to perform assembly of the workpiece.

[0005] The clamping assembly includes a caliper screw, a caliper moving end and a caliper fixed end. The upper end of the caliper fixed end is fixedly inserted in the cloth-installing groove and is located at one end in the length direction of the cloth-installing groove. The caliper screw is rotatably installed in the middle of the cloth-installing groove. The axial direction of the caliper screw is connected to the length direction of the cloth-installing groove for wiring. The caliper screw is axially limited in the cloth-installing groove. The upper end of the caliper moving end is inserted in the cloth-installing groove and is sleeved on the caliper screw. A threaded transmission is provided between the caliper moving end and the caliper screw. The caliper screw is rotated in the forward or reverse direction to adjust the clamping aperture between the caliper moving end and the caliper fixed end to increase or decrease.

[0006] The clamping assembly further includes a lead screw operating rod, a bearing support seat and a bearing. One end of the caliper lead screw is rotatably mounted on the main frame, and a bearing is arranged between the caliper lead screw and the main frame. The other end of the caliper lead screw is sleeved with a bearing and penetrates through the bearing support seat. The bearing support seat is detachably and fixedly mounted on the side vertical surface of the main frame through a bearing support seat fixing screw. On the operating end of the caliper lead screw protruding outside the main frame, the lead screw operating rod is detachably and fixedly mounted through an operating rod fixing screw.

[0007] The pressing assembly includes a circlip pressing rod slider and a circlip pressing rod. The circlip pressing rod slider is slidably fitted in the slideway. A guide rod hole is vertically and throughly opened on the circlip pressing rod slider. The circlip pressing rod is rotatably inserted into the guide rod hole. The operating end of the circlip pressing rod is located above the circlip pressing rod slider, and the top supporting end of the circlip pressing rod is located below the circlip pressing rod slider. An operating cap of the circlip pressing rod is fixedly mounted at the end of the operating end of the circlip pressing rod.

[0008] The circlip pressing rod is a bent rod, which successively includes a top rod, a cross rod and a bottom rod from top to bottom. The axes of the top rod and the bottom rod are parallel to each other and eccentrically arranged. The cross rod is integrally connected between the top rod and the bottom rod.

[0009] The beneficial effects of the present invention are as follows: The structure of the tool is adjustable, and it can clamp tensioners of various sizes, that is, it can meet the requirements of the plunger retraction of chain tensioners of various sizes; the overall structure layout of the tool is reasonable and compact, safe and reliable; the pressing assembly and the clamping assembly provided in the tool can simultaneously perform the opening of the circlip and the back-pushing of the plunger, reducing the working difficulty, further reducing the labor intensity of technicians, and thus improving the working efficiency. Description of the Drawings

[0010] In the drawings:

[0011] Figure 1 is the top view of the overall structure of the present invention;

[0012] Figure 2 is the side view of the overall structure of the present invention;

[0013] Figure 3 is the axonometric drawing of the overall structure of the present invention;

[0014] Figure 4 is Figure 2 the partial enlarged view of part A in;

[0015] In the figure: 1, main frame; 2, circlip pressing rod slider; 3, caliper lead screw; 4, lead screw operating rod; 5, operating rod fixing screw; 6, operating cap of circlip pressing rod; 7, circlip pressing rod; 8, caliper moving end; 9, caliper fixed end; 10, bearing support seat; 11, bearing; 12, bearing support seat fixing screw; 13, tensioner; 14, circlip; 15, plunger. Detailed implementation mode

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. The accompanying drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0017] An engine chain tensioner plunger auxiliary retraction tool includes a main body frame 1, a supporting and pressing assembly, and a clamping assembly. A slideway is opened along the length direction on the main body frame 1, the supporting and pressing assembly is slidably installed in the slideway, a cloth installation groove is opened on the main body frame 1 parallel to the slideway, the driving assembly at the upper end of the clamping assembly is inserted into the cloth installation groove, and the clamping end at the lower end of the clamping assembly is suspended below the main body frame 1. The driving assembly is operated to adjust the clamping diameter of the clamping assembly to adapt to clamping the tensioner 13 to be assembled. The tensioner 13 to be assembled is clamped on the clamping end of the clamping assembly and is located below the slideway. The supporting and pressing assembly is slid and adjusted to expand the snap ring 14 to cooperate with the clamping assembly to perform the assembly of the workpiece.

[0018] The clamping assembly includes a caliper screw rod 3, a caliper mobile end 8, and a caliper fixed end 9. The upper end of the caliper fixed end 9 is fixedly inserted into the cloth installation groove and is located at one end of the length direction of the cloth installation groove. The caliper screw rod 3 is rotatably installed in the middle of the cloth installation groove. The axial direction of the caliper screw rod 3 is arranged in the same direction as the length direction of the cloth installation groove. The caliper screw rod 3 is axially limited in the cloth installation groove. The upper end of the caliper mobile end 8 is inserted into the cloth installation groove and sleeved on the caliper screw rod 3. The caliper mobile end 8 is in threaded transmission with the caliper screw rod 3. A nut is rotatably installed on the caliper mobile end 8, and the nut is axially limited on the caliper mobile end 8. The caliper screw rod 3 is threadedly fitted and inserted into the nut. Rotating the caliper screw rod 3 drives the caliper mobile end 8 to move along the cloth installation groove through the nut. Rotating the caliper screw rod 3 in the forward or reverse direction respectively adjusts the clamping diameter between the caliper mobile end 8 and the caliper fixed end 9 to increase or decrease.

[0019] The clamping assembly further includes a screw rod operating rod 4, a bearing support seat 10, and a bearing 11. One end of the caliper screw rod 3 is rotatably mounted on the main body frame 1, a bearing 11 is arranged between the caliper screw rod 3 and the main body frame 1. The other end of the caliper screw rod 3 is sleeved with a bearing 11 and penetrates through the bearing support seat 10. The bearing support seat 10 is detachably and fixedly installed on the side vertical surface of the main body frame 1 through a bearing support seat fixing screw 12. On the operating end of the caliper screw rod 3 protruding outside the main body frame 1, the screw rod operating rod 4 is detachably and fixedly installed through an operating rod fixing screw 5. Holding the screw rod operating rod 4 to rotate the caliper screw rod 3 is easy and labor-saving.

[0020] The supporting and pressing assembly includes a retaining spring pressure rod slider 2 and a retaining spring pressure rod 7. The retaining spring pressure rod slider 2 is slidably embedded in the slideway, and the retaining spring pressure rod slider 2 can slide freely along the length direction of the slideway. A guide rod hole is provided on the retaining spring pressure rod slider 2 in the vertical direction, and the retaining spring pressure rod 7 is rotatably inserted in the guide rod hole. The operating end of the retaining spring pressure rod 7 is located on the upper side of the retaining spring pressure rod slider 2, and the top supporting end of the retaining spring pressure rod 7 is located on the lower side of the retaining spring pressure rod slider 2. The operating end of the retaining spring pressure rod 7 is fixedly installed with a retaining spring pressure rod operating cap 6, and the retaining spring pressure rod 7 can rotate freely and slide up and down in the guide rod hole. Hold the retaining spring pressure rod operating cap 6 to rotate the retaining spring pressure rod 7, and after aligning the top supporting end of the retaining spring pressure rod 7 with the opening of the retaining spring 14, press down the retaining spring pressure rod 7 to allow the top supporting end to support the retaining spring 14, so as to ensure that the plunger 15 can be smoothly inserted into the tensioner 13.

[0021] The retaining spring pressure rod 7 is a bent rod, which is composed of a top rod, a cross rod and a bottom rod from top to bottom. The axes of the top rod and the bottom rod are parallel to each other and are eccentrically arranged. The cross rod is integrally connected between the top rod and the bottom rod. The retaining spring pressure rod operating cap 6 is installed on the top of the top rod. By holding the retaining spring pressure rod operating cap 6 and rotating the retaining spring pressure rod 7, the opening of the support block and the retaining spring 14 can be adjusted for longitudinal alignment. During the adjustment process, when the axis of the support block is coplanar with the axis of the plunger 15, the support block is most effective in supporting the retaining spring 14 and the working efficiency is the highest.

[0022] A method for using an engine chain tensioner plunger auxiliary retraction tool:

[0023] Step 1: Clamp the tensioner 13 to be assembled between the caliper moving end 8 and the caliper fixed end 9, so that the outer end of the plunger 15 is against the clamping surface of the caliper moving end 8, and the axis of the plunger 15 is perpendicular to the clamping surface of the caliper moving end 8. When clamping, hold the screw operating rod 4 to rotate the caliper screw 3, drive the caliper moving end 8 to move, and then adjust the distance between the caliper moving end 8 and the caliper fixed end 9 to adapt to the size of the tensioner 13 to be assembled, and place the tail end of the tensioner 13 against the clamping surface of the caliper fixed end 9, adjust the axis of the plunger 15 to be perpendicular to the clamping surface of the caliper moving end 8, and then rotate the caliper screw 3 in the opposite direction, so that the caliper moving end 8 moves to cooperate with the caliper fixed end 9 to clamp the tensioner 13;

[0024] Step 2: Slide the retaining spring pressure rod slider 2 to change its position, rotate the retaining spring pressure rod 7 so that its lower end is aligned with the opening of the retaining spring 14 and then press downward to open the retaining spring 14;

[0025] Step three, rotating the caliper screw rod 3 to drive the caliper movable end 8 to move the push plunger 15 and insert it into the tensioner 13. After the insertion amount of the plunger 15 on the tensioner 13 meets the requirements, insert the plunger fixing needle to complete the retraction and fixation of the plunger 15.

[0026] It will be understood that the present invention is described by way of some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Additionally, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of protection of the present invention.

Claims

1. An engine chain tensioner plunger auxiliary retraction tool, characterized in that: The invention comprises a main frame (1), a supporting and pressing assembly and a clamping assembly. A slideway is provided on the main frame (1) along the length direction. The supporting and pressing assembly is slidably installed in the slideway. A mounting groove is provided on the main frame (1) parallel to the slideway. The driving assembly of the clamping assembly is located at the upper end and inserted into the mounting groove. The clamping end of the clamping assembly is located at the lower end and is suspended below the main frame (1). The driving assembly is operated to adjust the clamping diameter of the clamping assembly to adapt to clamping the tensioner (13) to be assembled. The tensioner (13) to be assembled is clamped on the clamping end of the clamping assembly and is located below the slideway. The supporting and pressing assembly is slidably adjusted to open the retaining spring (14) to cooperate with the clamping assembly to perform assembly of the workpiece.

2. The engine chain tensioner plunger auxiliary retraction tool according to claim 1, characterized in that: The clamping assembly comprises a caliper screw (3), a caliper movable end (8) and a caliper fixed end (9); the upper end of the caliper fixed end (9) is fixedly inserted in the cloth-installing groove and is located at one end in the length direction of the cloth-installing groove; the caliper screw (3) is rotatably installed in the middle of the cloth-installing groove; the axial direction of the caliper screw (3) is connected to the length direction of the cloth-installing groove; the caliper screw (3) is axially limited in the cloth-installing groove; the upper end of the caliper movable end (8) is inserted in the cloth-installing groove and sleeved on the caliper screw (3); a threaded transmission is formed between the caliper movable end (8) and the caliper screw (3); the caliper screw (3) is rotated to rotate in the forward or reverse direction, that is, the clamping aperture between the caliper movable end (8) and the caliper fixed end (9) is increased or decreased.

3. The engine chain tensioner plunger auxiliary retraction tool according to claim 2, characterized in that: The clamping assembly also includes a screw operating rod (4), a bearing support seat (10) and a bearing (11); one end of the caliper screw (3) is mounted on a rotating frame on the main frame (1); the bearing (11) is arranged between the caliper screw (3) and the main frame (1); the other end of the caliper screw (3) is fitted with the bearing (11) and is installed on the bearing support seat (10); the bearing support seat (10) is detachably fixedly installed on the side surface of the main frame (1) by means of a bearing support seat fixing screw (12); the caliper screw (3) is extended out of the operating end outside the main frame (1) and the screw operating rod (4) is detachably fixedly installed by means of an operating rod fixing screw (5).

4. An engine chain tensioner plunger auxiliary retraction tool according to claim 1 or 3, characterized in that: The support and pressure assembly comprises a retaining spring pressure rod slider (2) and a retaining spring pressure rod (7), wherein the retaining spring pressure rod slider (2) is slidably embedded in a slideway, a guide rod hole is provided on the retaining spring pressure rod slider (2) in a vertical direction, and the retaining spring pressure rod (7) is rotatably inserted in the guide rod hole, the operating end of the retaining spring pressure rod (7) is located on the upper side of the retaining spring pressure rod slider (2), and the top support end of the retaining spring pressure rod (7) is located on the lower side of the retaining spring pressure rod slider (2), and the operating end of the retaining spring pressure rod (7) is fixedly installed with a retaining spring pressure rod operating cap (6).

5. The engine chain tensioner plunger auxiliary retraction tool according to claim 4, characterized in that: The clamping spring pressure rod (7) is a bent rod, and the clamping spring pressure rod (7) is composed of a top rod, a cross rod and a bottom rod from top to bottom. The axes of the top rod and the bottom rod are parallel to each other and are eccentrically arranged. The cross rod is integrally connected between the top rod and the bottom rod. A support block is fixedly arranged at the lower end of the bottom rod. The support block is cylindrical, and the axis of the support block is colinear with the axis of the bottom rod.

6. A method for using a plunger auxiliary retraction tool for an engine chain tensioner according to any one of claims 1 to 5, characterized in that: Step 1: Clamp the tensioner (13) to be assembled between the movable end (8) of the caliper and the fixed end (9) of the caliper, so that the outer end of the plunger (15) abuts against the clamping surface of the movable end (8) of the caliper, and the axis of the plunger (15) is perpendicular to the clamping surface of the movable end (8) of the caliper; Step 2: Slide the retaining spring pressure rod slider (2) to change its position, rotate the retaining spring pressure rod (7) so that its lower end is aligned with the opening of the retaining spring (14), and then press downward to open the retaining spring (14); Step 3, rotating the caliper screw rod (3) to drive the caliper moving end (8) to move the push plunger (15) and insert it into the tensioner (13).

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