JP6409740B2 - Retainer and cotter continuous assembly equipment - Google Patents

Description

  The present invention relates to a retainer and cotter continuous assembling apparatus for continuously assembling a retainer and a cotter to end portions of valve stems of two or more valves inserted into a valve guide of a cylinder head.

  The cylinder head is provided with a plurality of valve guides. Valve stems constituting the valves are inserted into the respective valve guides, and the valve heads constituting the valves are assembled so that the intake and exhaust ports of the cylinder head can be opened and closed.

  The valve stem is mounted on the cylinder head with a valve spring disposed around the valve stem. This mounting is performed by assembling a retainer and two half cotters at the end of the valve stem.

  The conventional retainer and cotter assembly method is such that the intake and exhaust ports of the cylinder head are fixed downward, the valve is inserted into the valve guide from below, and the end of the valve stem faces upward. In order to prevent the valve from dropping (escape) downward, the valve head is supported from below by a fixing jig. Since the valve head is supported from below by the fixing jig, the retainer and the cotter can be easily assembled to the end of the valve stem facing upward.

  In the method of supporting the valve head with the fixing jig as described above, the retainer and the cotter can be assembled to the plurality of valve stems at a time by using the plurality of fixing jigs.

  By the way, the position and number of each of the plurality of valves in the valve head differ depending on the vehicle type. However, when the above-described retainer and cotter assembly method using the fixing jig is applied to multiple vehicle types, the fixing position by the fixing jig is used. Need to be switched for each vehicle type. And since switching of the fixing position by this fixing jig requires time and labor, it is an obstacle to dealing with multiple vehicle types. In addition, when this switching is performed by an electric servo motor or the like, it is necessary to provide a separate safety measure facility, which is also one of the obstacles for dealing with multiple vehicle types.

  Therefore, instead of fixing the valve with a fixing jig, a method for preventing escape of the valve with a spring is conceivable. In other words, a spring is provided below the valve and the valve reaction is prevented by the spring reaction force, but this method may cause the cylinder head to float upwards due to the spring reaction force. Therefore, it is necessary to fix the cylinder head by a clamp mechanism for preventing floating.

  Also, when trying to prevent the escape of two or more valves by the reaction force of the spring, the total reaction force multiplied by the reaction force of the spring corresponding to each valve and the number of springs acts on the cylinder head. Again, a clamp mechanism for preventing floating is required. That is, if the cylinder head does not prevent the cylinder head from being lifted by the clamp mechanism for lifting, only the retainer and cotter can be assembled to one valve. In other words, the retainer and cotter are assembled to multiple valves. Cannot be executed continuously, so productivity cannot be expected.

  Here, Patent Document 1 also discloses a cotter assembling tool for assembling a retainer and a cotter at the end of a valve stem while preventing escape of the valve by a spring force.

JP-A-57-178675

  Even with the cotter assembly disclosed in Patent Document 1, the above-described problem, that is, the retainer and the cotter are continuously assembled to a plurality of valves without fixing the cylinder head with a clamp mechanism for preventing floating. It cannot be executed.

  The present invention has been made in view of the above-described problems, and it is possible to continuously perform assembly of a retainer and a cotter on a plurality of valves without fixing a cylinder head by a clamp mechanism for preventing floating. An object of the present invention is to provide a continuous assembly device for a retainer and a cotter.

  In order to achieve the above object, the retainer and cotter continuous assembly device according to the present invention includes a valve head having a valve head facing downward in two or more valves inserted into a valve guide of a cylinder head, and a valve spring around the valve stem. A retainer and cotter continuous assembly device, wherein the retainer and the cotter are continuously assembled to the end of the valve stem with the end of the valve stem facing upward, respectively. Two or more assembling tools for pushing the cotter downward, and a valve escape prevention tool for supporting each of the two or more valve heads from below, and two or more escape prevention rods contacting each valve head A biasing member that biases the escape prevention rod upward, a connector that connects two or more escape prevention rods, and two or more relief It consists of a support base on which a prevention rod is mounted so as to be movable in the vertical direction, a valve escape prevention tool, and a wire connecting the support base and two or more assembly tools. The retainer and the cotter are lowered by lowering the assembly tool. When the base is pushed downward, the support base rises via the wire, and the escape prevention rod is biased upward via the biasing member by the rise of the support base, thereby applying a push-up force to the valve head. There are steps in the height of the heads of two or more escape prevention rods, and the valve stems in order from the retainer and the cotter of the valve corresponding to the escape prevention rods with higher head heights. Assembling to the end is performed.

  The retainer and cotter continuous assembling apparatus according to the present invention is configured by connecting two or more sets of retainers and cotters downwardly and two or more assembly tools and two or more valve escape prevention tools with wires. It is characterized in that a step is provided in the height of the heads of the two or more escape prevention rods. With this feature configuration, the end of the valve stem from the valve retainer and the cotter corresponding to the escape prevention rod with a high head height is raised in order without lifting the cylinder head that is not fixed by the clamp mechanism by the lifting force. Assembly to the part becomes possible.

  For example, when a retainer and a cotter are assembled in order at the ends of two valve stems, a step is provided on the heads of two escape prevention rods corresponding to the respective valves.

  The two assembling tools are lowered to try to push the retainer and the cotter respectively against the end portions of the corresponding two valves, and the supporting table connected to the wire moves upward by the lowering of the assembling tool. The “wire” includes not only a literal wire but also a chain.

  As the support base moves upward, a biasing member such as a spring is biased, and the two escape prevention rods are biased upward by the biasing of the biasing member.

  Here, since the heads of the two escape prevention rods are stepped, the escape prevention rod with a high head height first contacts the valve head of the corresponding valve and is assembled via the valve head. The pushing force from the tool is transmitted, and as a reaction force against the pushing force, a pushing force is applied to the valve head.

  On the other hand, at this stage, the escape prevention rod having a low head is not in contact with the valve head of the corresponding valve.

  If the pressing force from the assembly tool on one valve is Ft and the urging forces when the two urging members are urged are Fb / 2, respectively, only the valve head of one valve is pushed up first. In this case, Fb / 2 × 2 = Fb, which is the sum of the urging forces of the two urging members, can be applied to one valve as a pushing force. The pushing force Fb, which is the sum of the urging forces, is greater than the pushing force Ft, and it is necessary that the valve head does not float due to the difference between the two.

  In a valve with a lifting force applied from the escape head with a high head, the valve stem end is supported by the pushing force of the assembly tool because it is supported by the escape rod from below. The retainer and cotter are assembled to the part.

  For example, if Ft = 200N and Fb = 210N are set, and the cylinder head does not lift up even if 10N, which is the difference between Ft and Fb, acts on the cylinder head from below under these setting conditions. In this case, the cylinder head is prevented from floating upward when the retainer and the cotter are assembled to the end of the valve stem of one valve.

  When the retainer and cotter are assembled to the end of the valve stem of the valve that corresponds to the high-head escape rod, the push-in force is released, which in turn results in the low-head escape rod. A pushing force acts on the end of the valve stem of the corresponding valve, and a pushing force is applied to the valve head of the valve corresponding to the escape prevention rod having a low head height.

  This pushing force is also added to the urging force that urges the escape prevention rod with a high head height, which has already been assembled with the retainer and cotter, and the urging force that energizes the escape prevention rod with a lower head height. Fb / 2 × 2 = Fb, and this push-up force Fb supports the valve corresponding to the escape prevention rod with a low head height, and the pushing force by the assembly tool is applied to the end of the valve stem of the valve. The retainer and cotter are assembled.

  As described above, according to the retainer and cotter continuous assembling apparatus according to the present invention, the retainer can be continuously attached to the end portions of the valve stems of the plurality of valves without fixing the cylinder head with the clamp mechanism for preventing the float. And cotter assembly can be performed. In addition, the retainer and the cotter are not assembled with a plurality of valves fixed by a plurality of fixing jigs, and the relative position of the plurality of assembly tools and the valve escape prevention tool is adjusted. Can be applied to multiple vehicle types with different positions and numbers of valves.

  Similarly, when assembling the retainer and the cotter in order at the ends of the three valve stems, similarly, by providing a step on the heads of the three escape prevention rods corresponding to the respective valves, for example, the left end valve After the assembly of the retainer and the cotter at the end of the valve stem is completed, the retainer and the cotter are assembled to the central valve, and finally, the retainer and the cotter can be assembled to the rightmost valve.

  As can be understood from the above description, according to the retainer and cotter continuous assembling apparatus of the present invention, the cylinder head is fixed to the ends of the valve stems of a plurality of valves without being fixed by a clamp mechanism for preventing floating. As a result, the retainer and the cotter can be assembled continuously.

It is the schematic diagram explaining the continuous assembly | attachment apparatus of this invention. It is the schematic diagram explaining that the retainer and cotter of the valve | bulb corresponding to the escape prevention stick | rod with a high head height were assembled | attached. It is the schematic diagram which expanded the valve escape prevention tool. It is the schematic diagram explaining that the retainer and cotter of the valve | bulb corresponding to the escape prevention stick | rod with a low head height are assembled | attached.

  Embodiments of the retainer and cotter continuous assembly apparatus of the present invention will be described below with reference to the drawings. The illustrated example shows a continuous assembly device in which a retainer and a cotter are sequentially assembled to the end portions of two valve stems. However, a continuous configuration in which a retainer and a cotter are sequentially assembled to the end portions of three or more valve stems. Of course, it may be an assembling apparatus.

(Embodiment of continuous assembly device of retainer and cotter)
FIG. 1 is a schematic diagram illustrating a continuous assembly apparatus according to the present invention. FIG. 2 is a schematic diagram illustrating that a retainer and a cotter of a valve corresponding to a escape prevention rod having a high head are assembled. is there. FIG. 3 is an enlarged schematic view of the valve escape prevention tool, and FIG. 4 is a schematic view explaining that the retainer and cotter of the valve corresponding to the escape prevention rod having a low head height are assembled. is there.

  The continuous assembling apparatus 10 shown in the figure is a valve head VS1, VS2 of valves V1, V2 corresponding to two sets of retainers R1, R2 and cotters C1, C2, respectively, in a cylinder head CH in which valves are inserted through a plurality of valve guides. It is the apparatus which assembles | attaches continuously to the edge part.

  The continuous assembling apparatus 10 is provided with two sets of retainers R1 and R2 and cotters C1 and C2, respectively. The two assembling tools 1A and 1B and the valve heads VH1 and VH2 for supporting the valve escaping from below are prevented. It is generally composed of a tool 2, a support base 6 constituting the valve escape prevention tool 2, and a wire 7 connecting the two assembly tools 1A and 1B.

  As shown in FIG. 3, the valve escape prevention tool 2 includes a support base 6, escape prevention bars 3 </ b> A and 3 </ b> B, a connection tool 5 that couples both under the escape prevention bars 3 </ b> A and 3 </ b> B, and a spring. It is comprised from the urging | biasing materials 4A and 4B.

  The escape prevention rods 3A and 3B are respectively inserted into the two through holes formed in the support base 6, and are further inserted into the openings of the two opening flanges 6A1 and 6A2 and the opening flanges 6B1 and 6B2 fixed to the support base 6. It is mounted to the support base 6 so as to be movable in the vertical direction.

  The urging members 4A and 4B are disposed around the escape prevention rods 3A and 3B, and are disposed between the two opening flanges 6A1 and 6A2 and the opening flanges 6B1 and 6B2.

  There is a step in the height of the head of each of the two escape prevention rods 3A and 3B, and the head of the left escape prevention rod 3A is higher than the head of the right escape prevention rod 3B. Is high.

  Returning to FIG. 1, the wire 7 is connected to the two assembling tools 1 </ b> A and 1 </ b> B. The wire 7 extends downward via the two rollers 8 and 8 and is connected to the support base 6.

  The two assembling tools 1A and 1B are moved downward by the actuator (not shown) (X1 direction), and the two sets of the retainer R1, the cotter C1, the retainer R2, and the cotter C2 are respectively attached to the end portions of the corresponding valve stems VS1 and VS2. Push in. By the downward movement of the assembly tools 1A, 1B (X1 direction), the wire 7 extending to the support base 6 via the roller 8 moves upward (X2 direction), and the support base 6 is moved by the upward movement of the wire 7. Moves upward (X3 direction).

By the upward movement of the support base 6, the urging members 4A and 4B disposed between the two opening flanges 6A1 and 6A2 and the opening flanges 6B1 and 6B2 are compressed and urged upward.
Here, each of the urging members 4A and 4B is adjusted so that the urging force becomes Fb / 2.

  With the two assembling tools 1A and 1B, the two sets of retainer R1, cotter C1 and retainer R2 and cotter C2 push in the end portions of the corresponding valve stems VS1 and VS2. The retainer and the cotter cannot be assembled unless they are supported from below and have no reaction force against the pushing force.

  In the illustrated example, the height of the head of the left escape prevention rod 3A is high, so the left escape prevention rod 3A first contacts the valve head VH1 of the corresponding valve V1 and acts from the valve V1. The pushing force Ft is supported.

  Here, since not only the left biasing member 4A but also the right biasing member 4B is biased, as shown in FIGS. 1 and 2, Fb to which the respective biasing forces Fb / 2 are added is on the left side. Acting on the valve head VH1 via the escape prevention rod 3A and applying a push-up force Fb to the valve head VH1.

  The push-up force Fb, which is the sum of the two urging forces, is set to be larger than the push-in force Ft, and the force that prevents the cylinder head CH from floating due to the difference between the two. For example, by setting Ft = 200N and Fb = 210N, the lift force Fb exceeds the push force Ft, and the cylinder head CH that is not fixed by the clamp mechanism for preventing the lift is generated due to the difference. Can be eliminated.

  The retainer R1 and the cotter C1 are pushed into the end portion of the valve stem VS1 by the pushing force Ft by the assembling tool 1A with respect to the valve V1 supported by the pushing force Fb from below, and the assembling is executed.

  When the retainer R1 and the cotter C1 are assembled to the end of the valve stem VS1, the pushing force Ft acting on the valve stem VS1 becomes zero (release of pushing force), and therefore, the end of the right valve stem VS2 The retainer R2 and the cotter C2 are pushed in with the pushing force Ft.

  At this time, as shown in FIG. 4, the valve V2 slightly falls downward due to the pushing force Ft, and the valve head VH2 comes into contact with the right escape prevention rod 3B.

  The push-in force Ft acting from the valve V2 is supported by the escape prevention rod 3B in contact with the valve head VH2.

  Even at this stage, since both the right and left urging members 4A and 4B are urged, Fb to which the respective urging forces Fb / 2 are added is applied to the valve head VH2 via the right escape prevention rod 3B. Acts and applies a pushing force Fb to the valve head VH2.

  The retainer R2 and the cotter C2 are pushed into the end portion of the valve stem VS2 by the pushing force Ft by the assembling tool 1B with respect to the valve V2 supported by the pushing force Fb from below, and the assembling is executed.

  As described above, according to the continuous assembling apparatus 10, two sets of the valve heads VS1 and VS2 of the plurality of valves V1 and V2 are respectively fixed to the ends of the plurality of valves V1 and V2 without fixing the cylinder head CH with a clamp mechanism for preventing floating. The retainer R1, the cotter C1, the retainer R2, and the cotter C2 can be assembled continuously.

  Although not shown in the drawings, for example, in the case of continuously assembling four retainers and cotters at the ends of the valve stems of four valves, the continuous assembly device has four valve escape prevention tools corresponding to the four assembly tools. For example, a device in which the four escape prevention rods constituting each valve escape prevention tool are provided with steps so that the height of the head decreases in order from the left side may be applied. In the apparatus of this embodiment, it is preferable that the urging force of each urging member is Fb / 4, and the four urging forces are added together to be the pushing force Fb.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Assembly tool, 2 ... Valve escape prevention tool, 3A, 3B ... Escape prevention rod, 4A, 4B ... Energizing material (spring), 5 ... Connection tool, 6 ... Support stand, 7 ... Wire, 8 ... Roller DESCRIPTION OF SYMBOLS 10 ... Retainer and cotter continuous assembly device (continuous assembly device), SH ... Cylinder head, V1, V2 ... Valve, VS1, VS2 ... Valve stem, VH1, VH2 ... Valve head, VP1, VP2 ... Valve spring, VG1, VG2 ... Valve guide, R1, R2 ... Retainer, C1, C2 ... Cotter

Claims (1)

In two or more valves inserted into the valve guide of the cylinder head, the valve head is directed downward, the valve spring is disposed around the valve stem, and the end of the valve stem faces upward. A retainer and a cotter continuous assembling device for continuously assembling a retainer and a cotter respectively on the ends of the retainer,
Two or more assemblies, each of which pushes two or more sets of retainers and cotters downward;
A valve escape prevention tool for supporting each of the two or more valve heads from below, two or more escape prevention rods in contact with the respective valve heads, and a biasing member for biasing the escape prevention rods upward; A valve escape prevention tool comprising: a connecting tool for connecting two or more escape prevention rods;
A wire connecting the support base and two or more assembly tools,
When the assembly tool is lowered and the retainer and the cotter are pushed downward, the support base rises via the wire, and the escape prevention rod is biased upward via the biasing member by the rise of the support base. A push-up force is applied to the head,
There is a step in the height of the heads of two or more escape prevention rods, and the valve retainer and cotter corresponding to the escape prevention rods with higher head height can be assembled to the end of the valve stem in order. A continuous assembly device for retainers and cotters.

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