Chain tensioning mechanism for oil pump of diesel engine

Abstract

The invention discloses a diesel engine oil pump chain tensioning mechanism which comprises a machine body, a rotatable chain is installed on the machine body, an elastic tensioning mechanism is further installed on the machine body, the elastic tensioning mechanism comprises a guide plate, a spring piece and a limiting pin, the upper surface of the guide plate abuts against the outer side face of the chain, one end of the guide plate is rotatably installed on the machine body, and the other end of the guide plate abuts against the limiting pin. The limiting pin is installed on the machine body, the spring piece is located between the limiting pin and the guide plate and bends with the limiting pin as a fulcrum, and the two ends of the spring piece abut against the two ends of the guide plate respectively. The chain tensioning device has the beneficial effects that by arranging the elastic tensioning mechanism, in the using process of the chain, the elastic tensioning mechanism can conduct adaptive adjustment according to the impact force of the chain, and therefore tensioning of the chain is guaranteed, and the chain tensioning device adapts to the impact of the chain on the guide plate.

Description

Technical Field

[0001] The invention relates to oil pump chain tensioning, in particular to a diesel engine oil pump chain tensioning mechanism. Background Art

[0002] Most of the existing oil pump chains are not equipped with a tensioning mechanism. The market has reported that the chains have problems such as cracked sleeves and abnormal noises. Some oil pump chains use a chute to support and tension the chain. However, during use, due to the complex driving conditions, including acceleration, deceleration, and steady driving, and the acceleration and deceleration amplitudes are different, the existing tensioning mechanism is not well used for tensioning the oil pump chain. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a diesel engine oil pump chain tensioning mechanism.

[0004] The objective of the present invention is achieved through the following technical scheme: a diesel engine oil pump chain tensioning mechanism, comprising a body, a rotatable chain is installed on the body, an elastic tensioning mechanism is also installed on the body, the elastic tensioning mechanism comprises a guide plate, a spring sheet and a limit pin, the upper surface of the guide plate abuts against the outer side surface of the chain, one end of the guide plate is rotatably installed on the body, the limit pin is installed on the body, the spring sheet is located between the limit pin and the guide plate, and the spring sheet is bent with the limit pin as a fulcrum, and the two ends of the spring sheet respectively abut against the two ends of the guide plate.

[0005] Optionally, the guide plate includes an arc-shaped plate body, and a rotating part that rotates relative to the machine body is provided at the left end of the arc-shaped plate body.

[0006] Optionally, a resisting portion is provided on the rotating portion, and the left end of the spring sheet abuts against the resisting portion, forming a first slot between the resisting portion and the left end portion of the arc-shaped plate body, and a tongue portion is provided at the bottom of the right end of the arc-shaped plate body, extending to the left side, and forming a second slot between the tongue portion and the arc-shaped plate body, and an inner lining plate is installed on the arc-shaped plate body, the left end of the inner lining plate is stuck in the first slot, and the right end of the inner lining plate is stuck in the second slot.

[0007] Optionally, a first clamping block is provided on the end face of the resisting portion close to the first clamping slot, a wedge-shaped surface is provided on the outer side face of the first clamping block, a second clamping block is provided on the end face of the tongue close to the second clamping slot, a wedge-shaped surface is also provided on the outer side face of the second clamping block, avoidance notches are provided on both the left and right ends of the inner lining plate, and the first clamping block and the second clamping block are both located at the corresponding avoidance notches.

[0008] Optionally, the contact surface of the blocking portion that contacts the spring sheet is an arc-shaped surface.

[0009] Optionally, a hanging portion is provided on the inner side or the outer side of the tongue, a limiting portion is provided on the inner side surface of the hanging portion, and an accommodating gap for accommodating the spring sheet is provided between the limiting portion and the tongue.

[0010] Optionally, a protruding positioning column is further provided at the bottom of the tongue, and a positioning hole corresponding to the positioning column is opened at the right end of the spring sheet, and the positioning column passes through the positioning hole.

[0011] Optionally, a through hole is provided on the rotating part, and a screw is sleeved in the through hole.

[0012] Optionally, the screw is a step screw, a sleeve is sleeved on the small-diameter rod of the step screw, and there is always a gap between the end surface of the rotating part close to the sleeve and the sleeve.

[0013] Optionally, a baffle extending upward is provided on the outer side wall of the arc-shaped plate body.

[0014] Optionally, the spring sheet is a multi-layer spring sheet superposition structure

[0015] The present invention has the following advantages: the diesel engine oil pump chain tensioning mechanism of the present invention is provided with an elastic tensioning mechanism. During the use of the chain, the elastic tensioning mechanism can make adaptive adjustments according to the impact force of the chain, thereby ensuring the tension of the chain and adapting to the impact of the chain on the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 The structure diagram of the tensioning mechanism Figure 1 ;

[0018] Figure 3 The structure diagram of the tensioning mechanism Figure 2 ;

[0019] Figure 4 is a structural schematic diagram of the guide plate;

[0020] Figure 5 for Figure 3 Schematic cross-sectional view of AA in the figure;

[0021] Figure 6 It is a structural schematic diagram of the inner lining plate;

[0022] In the figure, 100-machine body, 200-chain, 300-elastic tensioning mechanism, 1-guide plate, 2-spring sheet, 3-limit pin, 4-screw, 5-sleeve, 6-inner lining plate, 11-arc plate body, 12-rotating part, 13-blocking part, 14-tongue, 15-hanging part, 16-limiting part, 17-positioning column, 18-baffle, 19-first slot, 20-first block, 21-second slot, 22-second block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1As shown, a diesel engine oil pump chain tensioning mechanism comprises a body 100, a rotatable chain 200 is mounted on the body 100, an elastic tensioning mechanism 300 is also mounted on the body 100, the elastic tensioning mechanism 300 comprises a guide plate 1, a spring sheet 2 and a limit pin 3, the upper surface of the guide plate 1 abuts against the outer side surface of the chain 200, one end of the guide plate 1 is rotatably mounted on the body 100, the limit pin 3 is mounted on the body 100, the spring sheet 2 is located between the limit pin 3 and the guide plate 1, and the spring sheet 2 is bent with the limit pin 3 as a fulcrum, and the two ends of the spring sheet 2 abut against the two ends of the guide plate 1 respectively. During installation, after the guide plate 1 is rotatably mounted on the body 100, the spring sheet 2 is bent and inserted between the guide plate 1 and the limit pin 3. At this time, the spring When the guide plate 1 rotates, the spring sheet 2 can also rotate around the limit pin 3, and the spring sheet 2 is bent with the limit pin 3 as the fulcrum, and its two ends are in contact with the guide plate 1. When the guide plate 1 is impacted, the guide plate 1 is subjected to force, which causes the guide plate 1 to rotate relative to the body 100. After the guide plate 200 rotates, the spring sheet 2 is deformed. After the spring sheet 2 is deformed, an elastic reaction force is generated, which can be transmitted to the guide plate 1. The elastic reaction force can hinder the rotation of the guide plate 1, thereby ensuring the tension of the chain 200. When the impact force on the guide plate 1 tends to be balanced, the guide plate 1 can adaptively find a suitable position. At this time, the deformation of the spring sheet 2 tends to be stable, and the chain 200 is tightened. The elastic reaction force is relatively stable, so that the tension of the chain 200 can be stably guaranteed. In specific use, the chain 200 generally has the greatest impact force on the guide plate 1 when accelerating or decelerating. During stable driving, since the elastic tensioning mechanism 300 has an adaptive effect, the impact force of the chain 200 on the guide plate 1 is relatively small. Therefore, when the vehicle accelerates or decelerates, the acceleration or deceleration is large, and the chain 200 exerts a large impact force on the guide plate 1. At this time, the guide plate 1 rotates under the action of the impact force. After the guide plate 1 rotates, the deformation of the spring sheet 2 increases, and the elastic reaction force generated by the spring sheet 2 hinders the rotation of the guide plate 1, so that the guide plate 1 always maintains contact with the chain 200, thereby The tension of the chain 200 is ensured, and the reliability of the transmission is ensured. After the acceleration or deceleration is completed and the speed of the vehicle tends to be stable, the guide plate 1 can adaptively rotate to a suitable position. Of course, the spring leaf 2 can also adaptively deform to a corresponding position, thereby further ensuring the abutment between the guide plate 1 and the chain 200, and ensuring the reliability of the tension of the chain 200. In addition, during the acceleration or deceleration process, the impact force of the chain 200 on the guide plate 1 increases, thereby causing the entire mechanism to vibrate more severely, and the spring leaf 2 can offset part of the impact force, thereby playing a role in shock absorption. Furthermore, the spring leaf 2 is a multi-layer spring leaf superposition structure. Through the shock absorption of the spring leaf 2, the jitter of the entire mechanism is reduced, thereby ensuring the smooth operation of the mechanism.

[0030] In this embodiment, if Figure 2 and Figure 4 As shown, the guide plate 1 includes an arc-shaped plate body 11, and a rotating part 12 that rotates relative to the body 100 is provided at the left end of the arc-shaped plate body 11. The arc-shaped plate body 11 contacts the chain 200, so that the contact area between the arc-shaped plate body 11 and the chain 200 is small, and the impact force can better act on the guide plate 1, thereby enabling the guide plate 1 to quickly make an adaptive rotation.

[0031] In this embodiment, since the impact force on the guide plate 1 is relatively large and the guide plate 1 is made of plastic, the material of the guide plate 1 is an existing material, which is a conventional choice, such as Figure 2 and Figure 3 As shown, a stopper 13 is provided on the rotating portion 12, and the left end of the spring sheet 2 is in contact with the stopper 13, and a first slot 19 is formed between the stopper 13 and the left end of the arc-shaped plate body 11, and a tongue 14 is provided at the bottom of the right end of the arc-shaped plate body 11, and the tongue 14 extends to the left, and a second slot 21 is formed between the tongue 14 and the arc-shaped plate body 11, and an inner lining plate 6 is installed on the arc-shaped plate body 11, and the left end of the inner lining plate 6 is stuck in the first slot 19, and the right end of the inner lining plate 6 is stuck in the second slot 21, and the structural strength of the guide plate 1 can be increased by the inner lining plate 6, thereby improving the impact resistance of the guide plate 1 and increasing the service life of the guide plate 1.

[0032] In this embodiment, if Figure 2 , Figure 3 and Figure 4 As shown, a first block 20 is provided on the end surface of the resisting portion 13 near the first slot 19, and a wedge-shaped surface is provided on the outer surface of the first block 20. A second block 22 is provided on the end surface of the tongue portion 14 near the second slot 21, and a wedge-shaped surface is also provided on the outer surface of the second block 22. Figure 6 As shown, the left and right ends of the inner lining plate 6 are provided with avoidance gaps, and the first clamping block 20 and the second clamping block 22 are both located at the corresponding avoidance gaps. Preferably, the inner lining plate 6 is an inner lining steel plate. During installation, the inner lining plate 6 is inserted into the first clamping groove 19 and the second clamping groove 21, and then the inner lining plate 6 is pushed. After the inner lining plate 6 contacts the clamping block, the guide plate 1 is deformed. Since the guide plate 1 is a plastic part, the guide plate 1 can be deformed, so that the inner lining plate 6 is inserted into the clamping groove. When the two ends of the inner lining plate 6 pass through the clamping block, the inner lining plate 6 is installed in place. At this time, the inner side of the inner lining plate 6 is limited by the bottom of the clamping groove, and the outer side of the inner lining plate 6 is limited by the clamping block, thereby preventing the inner lining plate 6 from being separated from the guide plate 1, and ensuring the reliability of the installation of the inner lining plate 6.

[0033] In this embodiment, if Figure 2 , Figure 3 and Figure 4As shown, the resisting portion 13 can be a square block or a triangular block, as long as it can abut against the spring sheet 2. Preferably, the contact surface of the resisting portion 13 that contacts the spring sheet 2 is an arc surface, that is, when the guide plate 1 is deformed, the contact position of the spring sheet 2 and the resisting portion 13 will change, thereby enabling the spring sheet 2 to better make adaptive deformation, and its contact position is not the same position, but changes continuously within a certain area, thereby ensuring the service life of the resisting portion 13.

[0034] When the impact force on the guide plate 1 is particularly large, such as sudden acceleration or sudden braking, the rotation amplitude of the guide plate 1 is large, and the deformation of the spring sheet 2 is also large, which may cause the spring sheet 2 to fail, and then cause the entire tensioning mechanism to fail, thereby bringing unexpected risks. Therefore, in this embodiment, if Figure 2 , Figure 3 and Figure 4 As shown, a hanging portion 15 is provided on the inner or outer side of the tongue 14, and a limiting portion 16 is provided on the inner side surface of the hanging portion 15. There is an accommodating gap between the limiting portion 16 and the tongue 14 for accommodating the spring sheet 2. During the rotation of the guide plate 1, when the spring sheet 2 contacts the limiting portion 16, the spring sheet 2 can no longer bend, thereby causing the guide plate 1 to no longer press the spring sheet 2. In other words, the guide plate 1 no longer rotates at this time. However, the guide plate 1 is still in contact with the chain 200 at this time, thereby ensuring the tension of the chain 200. When the impact force gradually decreases, the guide plate 1 can adaptively change again.

[0035] In this embodiment, if Figure 2 , Figure 3 and Figure 4 As shown, a raised positioning column 17 is also provided at the bottom of the tongue 14, and a positioning hole corresponding to the positioning column 17 is opened at the right end of the spring sheet 2. The positioning column 17 passes through the positioning hole. Through the cooperation between the positioning column 17 and the positioning hole, the spring sheet 2 will not separate from the guide plate 1 during use, thereby ensuring the reliability of the tensioning mechanism.

[0036] In this embodiment, if Figure 5As shown, a through hole is provided on the rotating part 12, and a screw rod 4 is installed in the through hole. Furthermore, the screw rod 4 is a step screw rod 4, and a sleeve 5 is installed on the small diameter rod of the step screw rod 4. There is always a gap between the end surface of the rotating part 12 close to the sleeve 5 and the sleeve 5. A baffle 18 extending upward is provided on the outer side wall of the arc-shaped plate body 11. During the initial installation, the chain 200 is between the baffle 18 and the sleeve 5. During use, the chain 200 itself has a moving swing during the transmission process. Therefore, when the chain 200 swings outward, the chain 200 is in contact with the baffle. The plate 18 collides with the guide plate 1, thereby driving the guide plate 1 away from the sleeve 5. When the chain 200 swings inward, the contact area between the chain 200 and the guide plate 1 is small, making it difficult for the rotating part 12 to get close to the sleeve 5. Furthermore, when the rotating part 12 abuts against the head of the screw 4, there is a gap of 0.5 mm between the sleeve 5 and the rotating part 12, and the swinging amplitude of the chain 200 itself is not large. Therefore, when in use, it can ensure that the rotating part 12 does not contact the sleeve 5, thereby ensuring that the guide plate 1 can rotate around the screw 4, thereby ensuring the reliability of the use of the tensioning mechanism.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A diesel engine oil pump chain tensioning mechanism, comprising a body, on which a rotatable chain is mounted, characterized in that: An elastic tensioning mechanism is also installed on the machine body, and the elastic tensioning mechanism includes a guide plate, a spring sheet and a limit pin. The upper surface of the guide plate abuts against the outer side surface of the chain, one end of the guide plate is rotatably installed on the machine body, and the limit pin is installed on the machine body. The spring sheet is located between the limit pin and the guide plate, and the spring sheet is bent with the limit pin as a fulcrum, and the two ends of the spring sheet abut against the two ends of the guide plate respectively.

2. A diesel engine oil pump chain tensioning mechanism according to claim 1, characterized in that: The guide plate comprises an arc-shaped plate body, and a rotating part which rotates relative to the machine body is arranged at the left end of the arc-shaped plate body.

3. A diesel engine oil pump chain tensioning mechanism according to claim 2, characterized in that: The rotating part is provided with a resisting part, the left end of the spring sheet is in contact with the resisting part, a first slot is formed between the resisting part and the left end of the arc-shaped plate body, a tongue is provided at the bottom of the right end of the arc-shaped plate body, the tongue extends to the left side, and a second slot is formed between the tongue and the arc-shaped plate body, an inner lining plate is installed on the arc-shaped plate body, the left end of the inner lining plate is stuck in the first slot, and the right end of the inner lining plate is stuck in the second slot.

4. A diesel engine oil pump chain tensioning mechanism according to claim 3, characterized in that: A first clamping block is provided on the end surface of the resisting portion close to the first clamping slot, and a wedge-shaped surface is provided on the outer surface of the first clamping block; a second clamping block is provided on the end surface of the tongue portion close to the second clamping slot, and a wedge-shaped surface is also provided on the outer surface of the second clamping block; avoidance notches are provided on both the left and right ends of the inner lining plate, and the first clamping block and the second clamping block are both located at the corresponding avoidance notches.

5. A diesel engine oil pump chain tensioning mechanism according to claim 3, characterized in that: The contact surface of the blocking portion that contacts the spring sheet is an arc-shaped surface.

6. A diesel engine oil pump chain tensioning mechanism according to claim 3, characterized in that: A hanging portion is arranged on the inner side or the outer side of the tongue portion, a limiting portion is arranged on the inner side surface of the hanging portion, and an accommodating gap for accommodating the spring sheet is provided between the limiting portion and the tongue portion.

7. A diesel engine oil pump chain tensioning mechanism according to claim 3, characterized in that: A protruding positioning column is also provided at the bottom of the tongue, and a positioning hole corresponding to the positioning column is opened at the right end of the spring sheet, and the positioning column passes through the positioning hole.

8. A diesel engine oil pump chain tensioning mechanism according to any one of claims 2 to 7, characterized in that: The rotating part is provided with a through hole, and a screw is sleeved in the through hole.

9. A diesel engine oil pump chain tensioning mechanism according to claim 8, characterized in that: The screw is a stepped screw, a sleeve is mounted on the small diameter rod of the stepped screw, there is always a gap between the end surface of the rotating part close to the sleeve and the sleeve, and a baffle extending upward is arranged on the outer side wall of the arc-shaped plate body.

10. A diesel engine oil pump chain tensioning mechanism according to claim 1, characterized in that: The spring sheet is a multi-layer spring sheet superposition structure.

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