Positioning tool for engine assembly hydraulic rocker arm

Abstract

This utility model discloses a positioning fixture for assembling a hydraulic rocker arm in an engine, relating to the field of monolithic hydraulic rocker arms. The positioning fixture includes a support frame with multiple claws on both sides. The process involves placing the rocker arm assembly fixture onto the cylinder head, inserting a hydraulic tappet into the tappet hole in the cylinder head, then inserting the monolithic rocker arm along the claw slots until it precisely contacts the valve tip. The intake and exhaust camshafts are then assembled and fixed, ensuring the intake and exhaust camshafts press firmly against the monolithic rocker arm without wobbling. The monolithic rocker arm is correctly seated. Finally, the rocker arm assembly fixture is removed. At this point, the pad surface of the monolithic rocker arm and the valve maintain a precise centerline fit, preventing misalignment or dislodgement. This avoids situations where visual inspection reveals poor stability and prolonged operating time.

Description

Technical Field

[0001] This utility model relates to the field of single-unit hydraulic rocker arm technology, specifically a positioning fixture for assembling a hydraulic rocker arm for an engine. Background Technology

[0002] Currently, single-unit hydraulic rocker arm assemblies are widely used in various diesel and gasoline engines.

[0003] The technical drawback of assembling a single hydraulic rocker arm assembly is that there is no tooling operation for assembling the single hydraulic rocker arm, and the pad surface and valve contact and seating status are identified and checked by visual inspection. This can lead to incorrect rocker arm seating posture or failure to seat. Moreover, visual inspection operation is time-consuming and has poor stability, which can eventually cause the engine rocker arm to fly off and fail to open and close the valve normally. Therefore, this application designs a positioning tooling for assembling hydraulic rocker arms in the engine, which can achieve quick and convenient assembly and ensure accurate seating of the rocker arm pad surface even in the narrow space of the cylinder head. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a positioning fixture for assembling hydraulic rocker arms in engines. This solves the problem that the lack of fixture operation in assembling single-unit hydraulic rocker arms, coupled with the reliance on visual inspection of the pad surface and valve contact and seating status, leads to incorrect rocker arm seating posture or failure to seat properly. Furthermore, visual inspection is time-consuming and unstable, ultimately causing the engine rocker arm to detach and prevent the valves from opening and closing normally.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a positioning fixture for assembling a hydraulic rocker arm in an engine, including a support frame, two handles on the support frame, a positioning pin at the bottom end of the handle, the positioning pin being inserted into the cylinder head, and multiple claws on both sides of the support frame.

[0006] Preferably, the claws are designed to avoid interference within the confined space of the cylinder head.

[0007] Preferably, the plurality of said claws form claw grooves with the support frame.

[0008] Preferably, the claw slots are symmetrically distributed on both sides of the support frame, with a total of 16 claw slots on the left and right sides of the tooling.

[0009] Preferably, the claw groove is provided for each individual rocker arm, and the two sides of the individual rocker arm are fitted with the two sides of the corresponding claw groove.

[0010] Preferably, the minimum clearance between the pawl and the single rocker arm is 0.52mm, and the minimum clearance between the pawl and the cylinder head periphery is 0.4mm.

[0011] Preferably, the cylinder head has a cylinder head positioning pin hole, and the cylinder head positioning pin hole is provided with a positioning pin.

[0012] Preferably, the minimum clearance between the locating pin and the locating pin hole in the cylinder head is 0.002 mm.

[0013] Preferably, an intake and exhaust camshaft is mounted on the cylinder head, and the intake and exhaust camshaft is in contact with a single rocker arm.

[0014] This utility model discloses a positioning fixture for assembling a hydraulic rocker arm in an engine, which has the following beneficial effects:

[0015] The engine is equipped with a positioning fixture for a hydraulic rocker arm. The rocker arm assembly fixture is placed on the cylinder head, and then the hydraulic tappet is inserted into the tappet hole in the cylinder head. Next, the monobloc rocker arm is inserted along the chuck groove until it makes precise contact with the top of the valve. Then, the intake and exhaust camshafts are assembled and fixed so that the intake and exhaust camshafts press the monobloc rocker arm firmly without wobbling. The monobloc rocker arm is seated in the correct position. Finally, the rocker arm assembly fixture is removed. At this point, the pad surface of the monobloc rocker arm and the valve always maintain a precise centerline fit, without any misalignment or dislodgement. This avoids the situation of poor stability and long working time that can be identified by the naked eye. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0018] Figure 2 Positioning front view for this embodiment;

[0019] Figure 3 This is a schematic diagram of the assembly of the single-unit rocker arm tooling in this embodiment;

[0020] Figure 4 This is a front view of the assembly of the single-unit rocker arm tooling in this embodiment;

[0021] Figure 5 This is a schematic diagram of the cylinder head structure in this embodiment;

[0022] Figure 6 This is a schematic diagram of the pad surface and valve assembly in this embodiment;

[0023] Figure 7 This is a schematic diagram of the locating pin and cylinder head pin hole in this embodiment;

[0024] Figure 8 This is a schematic diagram of the intake and exhaust camshaft installation in this embodiment.

[0025] In the diagram: 1. Support frame; 2. Handle; 21. Locating pin; 3. Collar; 31. Collar groove; 4. Single rocker arm; 5. Cylinder head; 51. Cylinder head locating pin hole; 52. Intake and exhaust camshafts. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] This application provides a positioning fixture for assembling hydraulic rocker arms in an engine. This solves the problem that assembling single-unit hydraulic rocker arms without fixture operation, and relying on visual inspection of the pad surface contact and seating position with the valve, can lead to incorrect rocker arm seating posture or failure to seat properly. Furthermore, visual inspection is time-consuming and unstable, ultimately causing the engine rocker arm to detach and prevent normal valve opening and closing. The new fixture places the rocker arm assembly fixture on the cylinder head 5, inserts the hydraulic tappet into the tappet hole in the cylinder head, and then inserts the single-unit rocker arm 4 along the claw groove 31 until it precisely contacts the valve tip. The intake and exhaust camshafts 52 are then assembled and fixed, ensuring that the intake and exhaust camshafts 52 press firmly against the single-unit rocker arm 4 without wobbling. The single-unit rocker arm 4 is seated correctly. Finally, the rocker arm assembly fixture is removed. At this point, the pad surface of the single-unit rocker arm 4 and the valve maintain a precise centerline fit, preventing misalignment or detachment. This avoids the instability and long working time associated with visual inspection.

[0028] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0029] This utility model discloses a positioning fixture for assembling a hydraulic rocker arm for an engine.

[0030] Example 1:

[0031] According to the appendix Figure 1-8 As shown, it includes a support frame 1, which has two handles 2. The handles 2 are designed for easier and quicker operation by assemblers and are lightweight, weighing about 366g.

[0032] The bottom end of the handle 2 is provided with a positioning pin 21, which is inserted into the cylinder head 5. Multiple claws 3 are provided on both sides of the support frame 1.

[0033] First, place the rocker arm assembly fixture onto the cylinder head 5, then insert the hydraulic tappet into the tappet hole in the cylinder head. Next, insert the single rocker arm 4 along the pawl groove 31 until it makes precise contact with the top of the valve. Then, assemble and fix the intake and exhaust camshafts 52 so that the intake and exhaust camshafts 52 press against the single rocker arm 4 without shaking. The single rocker arm 4 is in the correct seat position. Finally, remove the rocker arm assembly fixture.

[0034] At this time, the 4pad surface of the single rocker arm and the valve always maintain a precise fit with the center line, and there will be no misalignment or disengagement. This avoids the situation of poor stability and long working time when visually inspected.

[0035] Because the positioning fixture is not subject to any force but has a complex structure, the fixture is designed to use stainless steel. This material is easy to process and form, corrosion-resistant, wear-resistant and not easy to rust, and has high strength and is not easily deformed or broken.

[0036] The pawl 3 is designed to avoid interference within the narrow area of ​​the cylinder head 5.

[0037] Multiple claws 3 form claw grooves 31 with the support frame 1.

[0038] The claw grooves 31 are symmetrically distributed on both sides of the support frame 1, with a total of 16 claw grooves on the left and right sides of the tooling.

[0039] The claw groove 31 is provided for each single rocker arm 4, and the two sides of the single rocker arm 4 are in contact with the two sides of the corresponding claw groove 31.

[0040] The claw groove 31 formed by the claw 3 is used to fix the left and right sides of the single rocker arm 4, so as to prevent the single rocker arm 4 from wobbling left and right, causing misalignment or seat displacement.

[0041] The minimum clearance between the pawl 3 and the single rocker arm 4 is 0.52mm, and the minimum clearance between the pawl 3 and the cylinder head 5 is 0.4mm.

[0042] The tolerance design of the pawl groove 31 and the pawl 3 is precisely matched with the front width of the single rocker arm 4 and the periphery of the cylinder head 5, so that the pad surface of the single rocker arm 4 is precisely in contact with the center of the valve top surface.

[0043] Example 2:

[0044] According to the appendix Figure 1-8 As shown, it includes a support frame 1, and the upper end of the support frame 1 is provided with two handles 2.

[0045] The bottom end of the handle 2 is provided with a positioning pin 21, which is inserted into the cylinder head 5. Multiple claws 3 are provided on both sides of the support frame 1.

[0046] The cylinder head 5 has a cylinder head positioning pin hole 51, which corresponds to the positioning pin 21.

[0047] The positioning pin 21 and the cylinder head positioning pin hole 51 are set in a corresponding manner, which improves the accurate positioning of the mating surface between the cylinder head 5 and the support frame 1.

[0048] The minimum clearance between the locating pin 21 and the cylinder head locating pin hole 51 is 0.002mm. This ensures a precise match between the locating pin 21 and the cylinder head locating pin hole 51, thereby accurately positioning the support frame 1 and the cylinder head 5.

[0049] First, place the rocker arm assembly fixture so that the fixture positioning pin 21 is inserted into the cylinder head positioning pin hole 51. Then, install the support frame 1 corresponding to the cylinder head 5. Next, place the hydraulic tappet into the cylinder head tappet hole. Then, place the single rocker arm 4 along both sides of the claw groove 31 to automatically and precisely contact and fit with the top of the valve.

[0050] The cylinder head 5 is equipped with intake and exhaust camshafts 52, which are in contact with the single rocker arm 4.

[0051] Assemble and fix the intake and exhaust camshafts 52 to the cylinder head 5 so that the intake and exhaust camshafts 52 press against the single rocker arm 4 without wobbling, ensuring that the single rocker arm 4 is in the correct seat position. Finally, remove the rocker arm fixing device to complete the installation.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for assembling a hydraulic rocker arm in an engine, characterized in that, Includes a support frame (1), on which two handles (2) are provided. A positioning pin (21) is provided at the bottom end of the handle (2). The positioning pin (21) is inserted into the cylinder head (5). Multiple claws (3) are provided on both sides of the support frame (1).

2. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 1, characterized in that, The claw (3) is designed to avoid interference within the narrow area of ​​the cylinder head (5).

3. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 1, characterized in that, The multiple claws (3) and the support frame (1) form claw grooves (31).

4. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 3, characterized in that, The claw grooves (31) are symmetrically distributed on both sides of the support frame (1), with a total of 16 claw grooves on the left and right sides of the tooling.

5. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 4, characterized in that, The claw groove (31) is provided for each single rocker arm (4), and the two sides of the single rocker arm (4) are in contact with the two sides of the corresponding claw groove (31).

6. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 1, characterized in that, The minimum clearance between the pawl (3) and the single rocker arm (4) is 0.52 mm, and the minimum clearance between the pawl (3) and the cylinder head (5) is 0.4 mm.

7. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 1, characterized in that, The cylinder head (5) is provided with a cylinder head positioning pin hole (51), and the cylinder head positioning pin hole (51) is provided with a positioning pin (21).

8. The positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 7, characterized in that, The minimum clearance between the positioning pin (21) and the cylinder head positioning pin hole (51) is 0.002 mm.

9. A positioning fixture for assembling a hydraulic rocker arm for an engine according to claim 7, characterized in that, The cylinder head (5) is equipped with an intake and exhaust camshaft (52), which is in contact with a single rocker arm (4).

Images