Fuel pump device, system, and method

Abstract

Disclosed herein are devices, systems, and methods related to the design and features of a high-pressure fuel pump. The high-pressure fuel pump assembly includes a body, a camshaft, and an embossment. The body has a forward end and an opposite aft end and is configured to couple to a low-pressure fuel pump. The camshaft is received and secured within the central bore of the body for rotational movement within the central bore. A coupler end of the camshaft is configured to couple to a drive shaft of the low-pressure fuel pump. The embossment includes at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump assembly. The embossment is formed at the aft end of the body such that thermal stresses causing geometric deformation in the embossment are reduced over a range of engine temperature operating conditions.

Description

Related Applications

[0001] Cross - reference to Related Applications This application claims priority to U.S. Provisional Patent Application No. 63 / 076,753, titled "FUEL PUMP DEVICES, SYSTEMS, AND METHODS", filed on September 10, 2020, the entire disclosure of which is hereby expressly incorporated by reference herein.

Technical Field

[0002] The present disclosure generally relates to fuel pumps, and more particularly to fuel pumps used in connection with internal combustion engines.

Background Art

[0003] Internal combustion engines equipped with common rail fuel supply systems use high - pressure fuel pumps to ensure appropriate fuel pressure inside the rail at low engine speeds and to provide a good air - fuel mixture at high engine speeds. To meter and pressurize fuel, high - pressure fuel pumps typically include a single - part pumping plunger that reciprocates inside the bore of a barrel of the high - pressure fuel pump body. High - pressure fuel pumps typically receive fuel from a low - pressure fuel pump that draws fuel from a fuel reservoir such as a fuel tank.

Summary of the Invention

[0004] The present disclosure generally relates to devices, systems, and methods that include an improved high - pressure fuel pump device for an internal combustion engine that exhibits improved reliability over a range of engine operating temperatures. In accordance with the principles of the present disclosure, the design and features of a high - pressure fuel pump housing are disclosed. Such designs and features can enhance the robustness of the high - pressure fuel pump in response to the action of heat by having an emboss on the press zone (e.g., the zone where bearing force and thermal stress increase) of the high - pressure fuel pump.

[0005] The principles of this disclosure are particularly advantageous when used in connection with internal combustion engines. The advantage of this disclosure is that the design of the high-pressure fuel pump can mitigate thermal stresses that cause geometric deformation throughout the range of engine temperature operating conditions. Other advantages include reduced strain due to the action of heat, increased elastic resistance, and the ability to accommodate large hoop stresses. Similarly, the reduction in geometric deformation brought about by this disclosure leads to increased structural margins in press-fit assemblies (such as those involving the press-fitting of a camshaft into the body of the high-pressure fuel pump via a bushing) and the ability to maintain desirable gaps (such as between the camshaft and the bushing). Other advantages not discussed in detail herein will be apparent to those skilled in the art.

[0006] According to embodiments of the present disclosure, a high-pressure fuel pump may be configured to couple with a low-pressure fuel pump. The high-pressure fuel pump may include a body and an emboss. The body may have a front end and a rear end opposite the front end. The rear end may be configured to couple with a low-pressure fuel pump. The emboss may include at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump. The emboss may be formed on the rear end of the body such that thermal stress causing geometric deformation at the emboss is reduced over a range of engine temperature operating conditions.

[0007] In some such examples, the emboss can be formed on a press zone of a body into which a press-fit assembly is pressed against the inner surface of the emboss. In the example, the diameter of the emboss is four times the length of the emboss. In the example, the emboss can have a substantially toroidal shape. In the example, the outer periphery of the emboss can transition to a substantially flat portion at the top of the emboss. In the example, the emboss can include at least one notch that forms part of at least one fastener boss. In the example, at least one notch can extend from the outer periphery of the emboss to the side wall of the emboss.

[0008] In some such examples, the outer surface portion of at least one fastener boss can roughly follow the contour of the outer wall of the emboss. In some examples, at least one fastener boss may be positioned at the bottom of the emboss, surrounding a connector positioned at the bottom of the emboss. In some such examples, the connector includes a connector portion configured to connect a bracket to the emboss.

[0009] Examples of the present disclosure include a high-pressure fuel pump assembly that may include a body, a camshaft, and an emboss. The body may have a front end and a rear end opposite the front end. The rear end may be configured to couple to a low-pressure fuel pump. The camshaft may be received and fixed inside the central bore of the body so as to be rotatable within the central bore of the body. The coupler end of the camshaft may be configured to couple to the drive shaft of the low-pressure fuel pump. In the example, the coupler end of the camshaft may be received inside a press-fit assembly. In the example, the press-fit assembly may include a sleeve positioned around the outer surface of a bushing configured to receive the coupler end of the camshaft. The emboss may include at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump assembly.

[0010] In some such examples, the emboss can be formed on the rear end of the body so that the thermal stress causing geometric deformation in the emboss decreases over a range of engine temperature operating conditions. In the example, the emboss can be formed on a press zone of the body into which the press-fit assembly is pressed against the inner surface of the emboss. In the example, the diameter of the emboss is four times the length of the emboss.

[0011] An example of the present disclosure includes a housing for a high-pressure fuel pump configured to couple to a low-pressure fuel pump. The housing may include a body and an emboss. The body may have a front end, a rear end opposite the front end, a central bore, and at least one cylinder extending from the central bore. The rear end may be configured to couple to a low-pressure fuel pump. The central bore may be configured to receive and secure a camshaft so that the camshaft is rotatable within the central bore and periodically actsuates a plunger located inside at least one cylinder. The emboss may be substantially toroidal in shape. The emboss may include at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump. The emboss may be formed at the rear end of the body such that thermal stress causing geometric deformation at the emboss decreases over a range of engine temperature operating conditions.

[0012] In some such examples, the embossing can be formed on a press zone of a body into which a press-fit assembly is pressed into the inner surface of the embossing. The press-fit assembly may include a sleeve positioned around the outer surface of a bushing configured to receive the coupler end of a camshaft. The coupler end of the camshaft can be received inside the press-fit assembly. In the example, the embossing may include at least one notch that forms part of at least one fastener boss. In the example, at least one notch may extend from the outer circumferential wall of the embossing to the side wall of the embossing. The outer surface portion of at least one fastener boss may roughly follow the contour of the outer circumferential wall of the embossing and be positioned at the bottom of the embossing so as to surround a connector located at the bottom of the embossing.

[0013] The above and other features of this disclosure, as well as the methods for obtaining them, will become more apparent and the disclosure itself will be better understood by referring to the following description of embodiments of this disclosure, which will be interpreted in conjunction with the accompanying drawings. [Brief explanation of the drawing]

[0014] [Figure 1A] This is a perspective view of a high-pressure fuel pump assembly according to an aspect of the present disclosure. [Figure 1B] This is a side view of the housing of a high-pressure fuel pump assembly according to an aspect of the present disclosure. [Figure 1C] This is a cross-sectional view obtained at section AA in Figure 1A according to an aspect of this disclosure. [Figure 2A] This is a perspective view of the housing of a high-pressure fuel pump according to an aspect of the present disclosure. [Figure 2B] This is a rear view of the housing of a high-pressure fuel pump according to an aspect of the present disclosure. [Figure 3A] This is a rear view of a high-pressure fuel pump assembly according to an aspect of the present disclosure. [Figure 3B] This is a perspective view of the rear end of a high-pressure fuel pump assembly according to an aspect of this disclosure. [Modes for carrying out the invention]

[0015] The drawings illustrate embodiments of various features and components of the present disclosure; however, the drawings are not necessarily to scale, and certain features may be exaggerated to better illustrate and describe the present disclosure. The examples described herein illustrate embodiments of the present disclosure, and such examples should not be construed as limiting the scope of the present disclosure.

[0016] For the purpose of facilitating an understanding of the principles of this disclosure, embodiments illustrated in the drawings described below will now be referred to. Nevertheless, it will be understood that the scope of this disclosure is not intended to be limited thereto. This disclosure includes any changes and further modifications in the illustrated devices, described methods, and further applications of the principles of this disclosure, which are to be commonly conceived by those skilled in the art and relating to this disclosure. Furthermore, the embodiments have been selected to illustrate how those skilled in the art can implement this disclosure.

[0017] Referring to the figures, Figures 1A to 1C show various views of the high-pressure fuel pump assembly 100 according to an embodiment of the disclosure. Figure 1A is a perspective view of the high-pressure fuel pump assembly 100 according to an embodiment of the disclosure. Figure 1B is a side view of the housing 125 of the high-pressure fuel pump assembly 100 according to an embodiment of the disclosure. Figure 1C is a cross-sectional view obtained at section AA of Figure 1A according to an embodiment of the disclosure. Features of the examples shown in these figures will be described in detail below.

[0018] Cam-driven high-pressure fuel pump assemblies have become a common solution for generating high-pressure fuel in common rails used in direct-injection internal combustion engines. The camshaft 110 is housed and fixed within a central bore 120 that extends through the body 122 of the housing 125 of the high-pressure fuel pump assembly 100, allowing it to rotate within the central bore 120. The camshaft 110 includes a cam 112 that converts the rotational motion of the camshaft 110 into reciprocating motion (for example, via the rectangular shape of the cam 112). High-pressure fuel pump assemblies, such as the high-pressure fuel pump assembly 100, typically include a pumping element, such as a plunger (not shown), that reciprocates within a cylinder 126 extending from the central bore 120. The reciprocating motion of the plunger is typically achieved using a cam follower connected to the plunger, which follows the corresponding cam 112 as the camshaft 110 rotates. Two bushings 130 of the high-pressure fuel pump assembly 100 are positioned on the sides of the camshaft 110 and can support the camshaft 110 inside the central bore 120. One bushing 130 is located at the front end 127 of the high-pressure fuel pump assembly 100, and the other bushing 130 in the sleeve 132 is located at the rear end 128 of the high-pressure fuel pump assembly 100. The coupler end 116 of the camshaft 110 may be configured to be coupled to the drive shaft of a low-pressure fuel pump (not shown) coupled to the rear end 128 of the high-pressure fuel pump assembly 100. The low-pressure fuel pump is driven by the camshaft 110 and can supply pressurized fuel to the high-pressure fuel pump assembly 100. Under these circumstances, the operation and assembly of the high-pressure fuel pump assembly 100 may be subjected to the combined complex loads and thermal effects (e.g., over a range of engine operating temperatures), which may impair the operation and reliability of the high-pressure fuel pump assembly 100.

[0019] This disclosure relates to a high-pressure fuel pump assembly for a common rail of an internal combustion engine. More specifically, disclosed herein are devices, assemblies, and methods for reducing bearing strain and increasing the holding force of a bushing 130 and a sleeve 132 in a multi-cylinder, cam-driven high-pressure fuel pump assembly. According to the principles of this disclosure, a first fuel pump assembly 100 (e.g., a high-pressure fuel pump assembly 100) may include a body 122, a camshaft 110, and an emboss 150. The body 122 may have a front end 127 and a rear end 128 opposite the front end 127. As will be described in more detail herein, the camshaft 110 may be received and fixed within the central bore 120 of the body 122 so as to be rotatable within the central bore 120. The rear end 128 may be configured to be coupled to a second fuel pump assembly (e.g., a low-pressure fuel pump assembly) (not shown). The coupler end 116 of the camshaft 110 can be configured to connect, for example, to the drive shaft of the low-pressure fuel pump at its rear end 128. The combined load from the mounted low-pressure fuel pump and the components of the high-pressure fuel pump assembly 100 itself, as well as factors such as temperature variations over a range of engine operating conditions, can create localized hot spots that pose a risk to the operation and durability of the high-pressure fuel pump.

[0020] In an example, the boss 150 can be formed on a press zone ("PZ") of a body 122 into which the press-fit assembly 135 is press-fitted onto an inner surface 121 of the boss 150, as shown in FIGS. 1B and 1C. The press zone PZ can be defined as a part of the fuel pump that receives an increased force (e.g., axial force) by an internal component (e.g., the press-fit assembly 135) press-fitted inside the body 122 of the high-pressure fuel pump assembly 100. The force received in the press zone PZ can be deteriorated by components coupled to the high-pressure fuel pump assembly 100 such as a low-pressure fuel pump, and by the range of operating temperatures that the high-pressure fuel pump assembly 100 and the coupled components receive during harmonic, load, and engine operation. Geometric deformations specific to the range of operating temperatures (e.g., up to about 220 degrees Fahrenheit) can be caused by an increase in temperature, and can cause thermal stress in the region of geometric deformation (e.g., the press zone, PZ).

[0021] The bushing 130 and the sleeve 132 can be included in the press-fit assembly 135 and can engage with other components of the high-pressure fuel pump assembly 100. In the example, the press-fit assembly 135 can include a sleeve 132 disposed around an outer surface 131 of a bushing 130 configured to receive a coupler end 116 of the camshaft 110. The coupler end 116 of the camshaft 110 can be received inside the press-fit assembly 135, e.g., inside the bushing 130. Thus, the press-fit assembly 135 can be a three-shell type press-fit assembly 135 including a body 122 functioning as an outer cylinder, a sleeve 132 functioning as an intermediate cylinder, and a portion of the bushing 130 functioning as an intermediate cylinder. The press-fit assembly 135 can be a rear portion of the high-pressure fuel pump assembly 100, e.g., the press zone PZ. In this part of the high-pressure fuel pump assembly 100, the boss 150 can relieve thermal stress and equalize geometric deformation throughout the range of engine temperature operating conditions.

[0022] Figures 2A and 2B show various views of the housing 125 of a high-pressure fuel pump. Figure 2A shows a perspective view of the housing 125 of a high-pressure fuel pump according to an aspect of the present disclosure. Figure 2B shows a rear view of the housing 125 of a high-pressure fuel pump according to an aspect of the present disclosure. Such a high-pressure fuel pump can be used in a high-pressure fuel pump assembly discussed elsewhere in this specification. The features of the examples shown in these figures are described below.

[0023] The examples shown in these figures can be similar to those described elsewhere in this specification. For example, the housing 125 for a high-pressure fuel pump can be configured to couple to a low-pressure fuel pump and can include a body 122 and an emboss 150. The body 122 can have a front end 127, a rear end 128 opposite the front end 127, a central bore 120, and at least one cylinder 126 extending from the central bore 120. In the example, the emboss 150 can be formed on a press zone of the body 122 where a press-fit assembly is press-fitted onto the inner surface 121 of the emboss 150. The rear end 128 can be configured to couple to a low-pressure fuel pump. The central bore 120 can be configured to receive and secure a camshaft such that the camshaft can rotate within the central bore 120 and operate to periodically activate a plunger disposed within at least one cylinder 126. The press-fit assembly can optionally include a sleeve disposed around an outer surface of a bushing configured to receive a coupler end of the camshaft. The coupler end of the camshaft can be received within the press-fit assembly. When assembled, the press-fit assembly can be pressed against an inner surface of the housing 125 (e.g., the inner surface 121 of the emboss 150) within the press zone PZ.

[0024] In some examples, the embossing 150 surrounds the press zone PZ, providing an improved structural margin and resulting in elastic resistance, allowing it to adapt to large hoop stresses and reduce distortion due to thermal action. The embossing 150 can be formed on the rear end 128 of the body 122, so that the thermal stress causing geometric deformation in the embossing 150 is reduced over a range of engine temperature operating conditions. For example, the embossing 150 can have a substantially toroidal (e.g., ring or donut) shape and can outline over a portion of the housing 125 (e.g., at the rear end 128). Thus, the embossing 150 can be defined by a diameter D and a length L. In the example, the diameter D of the embossing 150 is greater than its length L. For example, the diameter D can be 2, 3, 4, or 5 times the length L of the embossing 150, etc. In the example, the length L may be the length of the press zone PZ.

[0025] The design of the emboss 150 can be a balance of dimensions and surface features to achieve engineering design criteria while controlling geometric deformations that maintain the gaps between the components of the high-pressure fuel pump. As described above, the diameter D and length L of the emboss 150 can be specified. Additionally or alternatively, the emboss 150 may include at least one fastener boss 260 configured to receive a fastener (not shown) for coupling the low-pressure fuel pump to the high-pressure fuel pump (e.g., in the housing 125). In the example, the outer periphery wall 252 of the emboss 150 may be entirely circular. In other examples, the outer periphery wall 252 may be partially circular, as shown here. In some such examples, the outer periphery wall 252 of the emboss 150 may transition to a substantially flat portion 254 at the top 251 of the emboss 150.

[0026] The fastener bosses 260 arranged around the emboss 150 can facilitate coupling components such as a low-pressure fuel pump to a high-pressure fuel pump. The flat portion 254 of the emboss 150, like the other portion of the emboss 150, may include one or more fastener holes 262 arranged inside one or more fastener bosses 260. The emboss 150 may include at least one fastener boss 260 configured to receive fasteners for coupling a low-pressure fuel pump to a high-pressure fuel pump. The fastener bosses 260 may include fastener holes 262 configured to receive fasteners or inserts for coupling components (such as a low-pressure fuel pump) to a high-pressure fuel pump. The number of fastener bosses 260 may match or differ from the number of fastener holes 262. In the example, at least one outer portion 264 of the fastener boss 260 can generally follow the contour of the outer wall 252 of the emboss 150 and can be positioned at the lower part 255 of the emboss 150 so as to surround the connector 270 located at the lower part 255 of the emboss 150.

[0027] The notches 280 can be positioned around the emboss 150 and can form features of the emboss, such as a fastener boss 260. In one example, the emboss 150 may include at least one notch 280 that forms part of at least one fastener boss 260. The at least one notch 280 may extend from the outer peripheral wall 252 of the emboss 150 to, for example, the side wall 256 of the emboss 150. In this way, the notch 280 may be in the form of a bevel on the periphery of the emboss 150. In another example, the notch 280 may be in the form of a recess extending from the side wall 256 to the emboss 150. In one example, the emboss 150 may include at least one notch 280 that forms part of at least one fastener boss 260. In this way, the outer surface portion 264 of the fastener boss can be formed by the notch. At least one outer surface portion 264 of the fastener boss 260 can substantially follow the contour of the outer peripheral wall 252 of the emboss 150. In this way, at least one outer surface portion 264 of the fastener boss 260 can be positioned at the lower part 255 of the emboss 150, surrounding a connector 270 positioned at the lower part 255 of the emboss 150. The connector 270 can be used to connect components to a high-pressure fuel pump.

[0028] Figures 3A and 3B show various views of the high-pressure fuel pump assembly 100 having the bracket 390. Figure 3A shows a side view of the high-pressure fuel pump assembly 100 according to an embodiment of the present disclosure. Figure 3B shows a perspective view of the rear end 128 of the high-pressure fuel pump assembly 100 according to an embodiment of the present disclosure. Features of the examples shown in these figures are described below.

[0029] The examples shown in these figures are similar to those described elsewhere in this specification. For example, a high-pressure fuel pump assembly 100 may be configured to couple with a low-pressure fuel pump and may include a body 122 and an emboss 150. The body 122 may have a front end 127 and a rear end 128 opposite the front end and may optionally be configured to couple with a low-pressure fuel pump. The emboss 150 may include at least one fastener boss 260 configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump assembly 100. The emboss 150 may be formed on the rear end 128 of the body 122 so that thermal stress causing geometric deformation in the emboss 150 is reduced over a range of engine temperature operating conditions. The emboss 150 may optionally have a substantially toroidal shape and may optionally be formed on a press zone PZ of the body 122 into which a press-fit assembly is press-fitted against the inner surface 121 of the emboss 150. The diameter D of the emboss 150 can be several times its length L (for example, about 2, 3, 4, or 5 times). In the example, the outer surface portion 264 of at least one fastener boss 260 can roughly follow the contour of the outer wall 252 of the emboss 150. In the example, the emboss 150 can include at least one notch 280 that forms part of at least one fastener boss 260. In the example, at least one notch 280 can extend from the outer wall 252 of the emboss 150 to the side wall 256 of the emboss 150.

[0030] In addition to the low-pressure fuel pump, other components such as a bracket 390 can be coupled to the high-pressure fuel pump assembly 100. In some examples, at least one fastener boss 260 may be located in the lower part 255 of the emboss 150, surrounding a connector 270 located in the lower part 255 of the emboss 150. In some such examples, the connector 270 includes a connector portion 272 configured to couple the bracket 390 to the emboss 150. In these circumstances, the connector portion 272 may be in the form of a projection from the emboss 150 and may include one or more fastener holes configured to receive fasteners for coupling the bracket 390 to the connector portion 272.

[0031] The connecting lines shown in the various diagrams contained herein are intended to represent illustrative functional relationships and / or physical connections between various elements. It should be noted that many alternative or additional functional relationships or physical connections may exist in actual systems. However, no benefit, advantage, or solution to a problem, nor any element that may produce or make more pronounce any benefit, advantage, or solution, shall be construed as a critical, necessary, or essential characteristic or element. Its scope should therefore not be limited by anything other than the appended claims, and references to singular elements are intended to mean "one or more" rather than "unique" unless expressly stated. Furthermore, if any phrase similar to “at least one of A, B, or C” is used in the claims, it is intended that such phrase be interpreted as meaning that only A may be present in an embodiment, only B may be present in an embodiment, only C may be present in an embodiment, or that any combination of elements A, B, or C, such as A and B, A and C, B and C, or A, B, and C may be present in a single embodiment.

[0032] In the detailed description herein, references to “one embodiment,” “embodiment,” and “exemplary embodiment” indicate that the described embodiments may include certain features, structures, or characteristics, but not all embodiments necessarily include such features, structures, or characteristics. Furthermore, such wording does not necessarily refer to the same embodiment. Moreover, when certain features, structures, or characteristics are described in relation to an embodiment, it is assumed that achieving such features, structures, or characteristics in relation to other embodiments is within the knowledge of a person skilled in the art, whether explicitly stated or not. After reading the description, it will be clear to a person skilled in the art how to implement the disclosure in alternative embodiments.

[0033] Furthermore, the elements, components, or steps of the methods of this disclosure are not intended to be dedicated to the public, regardless of whether the elements, components, or steps of the methods are expressly described in the claims. The claimed elements of this specification should not be construed under 35 U.S.C. 112(f) unless the elements are expressly enumerated using the phrase “means of.” As used herein, the terms “comprise,” “comprising,” or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus including a list of elements may include other elements that are not expressly listed or are inherent to such process, method, article, or apparatus, rather than including only those elements.

[0034] While embodiments have been described as having exemplary designs, this disclosure can be further modified within the spirit and scope of this disclosure. Therefore, this application intends to cover all variations, uses, or adaptations of this disclosure using its general principles. Furthermore, this application intends to cover any departures from this disclosure that are known or customary in the art relating to the invention. [Aspect 1] A high-pressure fuel pump configured to be coupled to a low-pressure fuel pump, A body having a front end and a rear end opposite to the front end, the rear end being configured to be coupled to the low-pressure fuel pump, and The body includes at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump, and the rear end of the body is embossed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions. The high-pressure fuel pump comprising the above-mentioned equipment. [Aspect 2] The high-pressure fuel pump according to embodiment 1, wherein the embossing is formed on the press zone of the main body into which the press-fit assembly is press-fitted. [Aspect 3] The high-pressure fuel pump according to embodiment 1, wherein the diameter of the emboss is approximately four times the length of the emboss. [Aspect 4] The high-pressure fuel pump according to embodiment 1, wherein the outer surface portion of at least one fastener posterior generally follows the contour of the outer peripheral wall of the emboss. [Aspect 5] The high-pressure fuel pump according to embodiment 1, wherein at least one of the fastener bosses is positioned at the lower part of the emboss so as to surround a connector located at the lower part of the emboss. [Aspect 6] The high-pressure fuel pump according to embodiment 5, wherein the connector comprises a connector portion configured to connect the bracket to the emboss. [Aspect 7] The high-pressure fuel pump according to embodiment 1, wherein the emboss includes at least one notch that forms part of the at least one fastener boss. [Aspect 8] The high-pressure fuel pump according to embodiment 7, wherein the at least one notch extends from the outer peripheral wall of the emboss to the side wall of the emboss. [Aspect 9] The high-pressure fuel pump according to embodiment 1, wherein the embossing has a substantially toroidal shape. [Aspect 10] The high-pressure fuel pump according to embodiment 1, wherein the outer peripheral wall of the emboss transitions to a substantially flat portion at the top of the emboss. [Aspect 11] A high-pressure fuel pump assembly, A body having a front end and a rear end opposite to the front end, the rear end being configured to be coupled to a low-pressure fuel pump, A camshaft, which is received and fixed inside the central bore of the body so as to be rotatable within the central bore, and the coupler end of the camshaft is configured to be coupled to the drive shaft of the low-pressure fuel pump, and The body includes at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump assembly, and the rear end of the body is embossed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions. The high-pressure fuel pump assembly comprising the above-mentioned components. [Aspect 12] The high-pressure fuel pump assembly according to embodiment 11, wherein the embossing is formed on the press zone of the main body into which the press-fit assembly is press-fitted. [Aspect 13] The high-pressure fuel pump assembly according to embodiment 12, wherein the coupler end of the camshaft is received inside the press-fit assembly. [Aspect 14] The high-pressure fuel pump assembly according to embodiment 12, wherein the press-fit assembly includes a sleeve disposed around the outer surface of a bushing configured to receive the coupler end of the camshaft. [Aspect 15] The high-pressure fuel pump according to embodiment 1, wherein the diameter of the emboss is approximately four times the length of the emboss. [Aspect 16] The high-pressure fuel pump according to Embodiment 1, wherein the outer surface portion of at least one fastener boss is positioned below the emboss so as to generally follow the contour of the outer peripheral wall of the emboss and surround a connector located below the emboss. [Aspect 17] The emboss includes at least one notch that forms part of the at least one fastener emboss, The high-pressure fuel pump according to embodiment 1, wherein the at least one notch extends from the outer peripheral wall of the emboss to the side wall of the emboss. [Aspect 18] A housing for a high-pressure fuel pump configured to be coupled to a low-pressure fuel pump, A body having a front end, a rear end opposite the front end, a central bore, and at least one cylinder extending from the central bore, wherein the rear end is configured to be coupled to the low-pressure fuel pump, and the central bore is configured to receive and fix the camshaft so that the camshaft is rotatable within the central bore and periodically actsuates a plunger located inside the at least one cylinder, and Having a substantially toroidal shape, and including at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump, the rear end of the body is formed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions, The housing comprising the above. [Aspect 19] The emboss is formed on the press zone of the main body into which the press-fit assembly is pressed into the inner surface of the emboss, The housing according to embodiment 18, wherein the press-fit assembly includes a sleeve positioned around the outer surface of a bushing configured to receive the coupler end of the camshaft, the coupler end of the camshaft is received inside the press-fit assembly. [Aspect 20] The emboss includes at least one notch that forms part of the at least one fastener emboss, The at least one of the notches extends from the outer peripheral wall of the emboss to the side wall of the emboss, The housing according to embodiment 18, wherein the outer surface portion of at least one fastener boss is positioned below the embossing, substantially following the contour of the outer peripheral wall of the embossing and surrounding a connector located below the embossing.

Claims

1. A high-pressure fuel pump configured to be coupled to a low-pressure fuel pump, A body having a front end and a rear end opposite to the front end, the rear end being configured to be coupled to the low-pressure fuel pump, and The body includes at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump, and the rear end of the body is embossed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions. Equipped with, The rear end includes a press zone that receives increased force due to internal components pressed into the body, The embossing is formed on the press zone, representing a high-pressure fuel pump.

2. The high-pressure fuel pump according to claim 1, wherein the emboss is formed on the press zone of the main body into which the press-fit assembly is press-fitted.

3. The high-pressure fuel pump according to claim 1, wherein the diameter of the emboss is approximately four times the length of the emboss.

4. The high-pressure fuel pump according to claim 1, wherein the outer surface portion of at least one fastener posterior generally follows the contour of the outer peripheral wall of the emboss.

5. The high-pressure fuel pump according to claim 1, wherein the at least one fastener boss is positioned at the lower part of the emboss so as to surround a connector located at the lower part of the emboss.

6. The high-pressure fuel pump according to claim 5, wherein the connector comprises a connector portion configured to connect the bracket to the emboss.

7. The high-pressure fuel pump according to claim 1, wherein the emboss includes at least one notch that forms part of the at least one fastener boss.

8. The high-pressure fuel pump according to claim 7, wherein the at least one notch extends from the outer peripheral wall of the emboss to the side wall of the emboss.

9. The high-pressure fuel pump according to claim 1, wherein the embossing has a substantially toroidal shape.

10. The high-pressure fuel pump according to claim 1, wherein the outer peripheral wall of the emboss transitions to a substantially flat portion at the top of the emboss.

11. A high-pressure fuel pump assembly, A body having a front end and a rear end opposite to the front end, the rear end being configured to be coupled to a low-pressure fuel pump, A camshaft, which is received and fixed inside the central bore of the body so as to be rotatable within the central bore, and the coupler end of the camshaft is configured to be coupled to the drive shaft of the low-pressure fuel pump, and The body includes at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump assembly, and the rear end of the body is embossed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions. Equipped with, The rear end includes a press zone that receives increased force due to internal components pressed into the body, The embossed area is formed on the press zone, forming a high-pressure fuel pump assembly.

12. The high-pressure fuel pump assembly according to claim 11, wherein the emboss is formed on the press zone of the main body into which the press-fit assembly is press-fitted.

13. The high-pressure fuel pump assembly according to claim 12, wherein the coupler end of the camshaft is received inside the press-fit assembly.

14. The high-pressure fuel pump assembly according to claim 12, wherein the press-fit assembly includes a sleeve disposed around the outer surface of a bushing configured to receive the coupler end of the camshaft.

15. The high-pressure fuel pump according to claim 1, wherein the diameter of the emboss is approximately four times the length of the emboss.

16. The high-pressure fuel pump according to claim 1, wherein the outer surface portion of at least one fastener boss is positioned below the emboss so as to substantially follow the contour of the outer peripheral wall of the emboss and surround a connector located below the emboss.

17. The emboss includes at least one notch that forms part of the at least one fastener emboss, The high-pressure fuel pump according to claim 1, wherein the at least one notch extends from the outer peripheral wall of the emboss to the side wall of the emboss.

18. A housing for a high-pressure fuel pump configured to be coupled to a low-pressure fuel pump, A body having a front end, a rear end opposite the front end, a central bore, and at least one cylinder extending from the central bore, wherein the rear end is configured to be coupled to the low-pressure fuel pump, and the central bore is configured to receive and fix the camshaft so that the camshaft is rotatable within the central bore and periodically actsuates a plunger located inside the at least one cylinder, and Having a substantially toroidal shape, and including at least one fastener boss configured to receive a fastener for coupling the low-pressure fuel pump to the high-pressure fuel pump, the rear end of the body is formed such that thermal stress causing geometric deformation is reduced within the range of engine temperature operating conditions, Equipped with, The rear end includes a press zone that receives increased force due to internal components pressed into the body, The emboss is formed on the press zone, which is the housing.

19. The emboss is formed on the press zone of the main body into which the press-fit assembly is pressed, The housing according to claim 18, wherein the press-fit assembly includes a sleeve disposed around the outer surface of a bushing configured to receive the coupler end of the camshaft, the coupler end of the camshaft is received inside the press-fit assembly.

20. The emboss includes at least one notch that forms part of the at least one fastener emboss, The at least one of the notches extends from the outer peripheral wall of the emboss to the side wall of the emboss, The housing according to claim 18, wherein the outer surface portion of at least one fastener boss is positioned below the emboss so as to substantially follow the contour of the outer peripheral wall of the emboss and surround a connector located below the emboss.

Images